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The following commit(s) were added to refs/heads/master by this push:
     new d022d629a3 [ZEPPELIN-6245] Improve Repository class stability and 
validation
d022d629a3 is described below

commit d022d629a3b901d631ac7d0560443cacfc780314
Author: renechoi <[email protected]>
AuthorDate: Fri Aug 1 15:03:02 2025 +0900

    [ZEPPELIN-6245] Improve Repository class stability and validation
    
    # Improve Repository Class Stability and Validation
    
    ## Summary
    
    This PR enhances the `Repository` class with comprehensive input 
validation, error handling, and stability improvements to ensure robust Maven 
repository configuration management.
    
    ## Changes Made
    
    ### 1. Enhanced Input Validation
    - **Repository ID validation**: Added regex pattern validation to ensure 
IDs contain only alphanumeric characters, dots, underscores, and hyphens
    - **URL validation**: Implemented URL format validation supporting HTTP, 
HTTPS, and FILE protocols
    - **Credentials validation**: Added validation to ensure both username and 
password are provided together
    - **Proxy validation**: Added comprehensive proxy configuration validation 
including protocol, host, and port checks
    
    ### 2. Improved Error Handling
    - **Custom Exception**: Created `RepositoryException` class for 
Repository-specific errors
    - **JSON parsing**: Enhanced error handling for malformed JSON with 
descriptive error messages
    - **Validation errors**: Comprehensive error messages for all validation 
failures
    
    ### 3. Builder Pattern Enhancements
    - **Method chaining**: Improved builder pattern with proper validation at 
each step
    - **Fluent API**: Enhanced usability with intuitive method names and return 
types
    
    ### 4. JSON Serialization Improvements
    - **Robust parsing**: Enhanced `fromJson()` method with comprehensive 
validation
    - **Backward compatibility**: Maintained compatibility with existing JSON 
formats
    - **Error resilience**: Graceful handling of invalid JSON inputs
    
    ### 5. Documentation and Code Quality
    - **Comprehensive JavaDoc**: Added detailed documentation with examples and 
parameter descriptions
    - **Usage examples**: Included code examples in class-level documentation
    - **Validation documentation**: Clear documentation of all validation rules
    
    ## Benefits
    
    1. **Improved Reliability**: Input validation prevents runtime errors from 
malformed configurations
    2. **Better Error Messages**: Clear, actionable error messages help users 
identify and fix configuration issues
    3. **Enhanced Security**: URL and credential validation prevents potential 
security issues
    4. **Maintainability**: Clean, well-documented code with comprehensive test 
coverage
    5. **User Experience**: Better error handling and validation feedback
    
    ## Testing
    
    - All existing tests pass
    - New comprehensive test suite covers edge cases and validation scenarios
    - Integration tests verify backward compatibility
    - Manual testing confirms REST API functionality
    
    ## Example Usage
    
    ```java
    // Basic repository configuration
    Repository repo = new Repository("central")
        .url("https://repo.maven.apache.org/maven2/";);
    
    // Repository with authentication
    Repository privateRepo = new Repository("private")
        .url("https://private.repo/maven2/";)
        .credentials("username", "password");
    
    // Repository with proxy configuration
    Repository proxyRepo = new Repository("proxy-repo")
        .url("https://repo.example.com/maven2/";)
        .proxy("HTTP", "proxy.host", 8080, "proxyUser", "proxyPass");
    ```
    
    
    Closes #4977 from renechoi/improve-repository-validation.
    
    Signed-off-by: Philipp Dallig <[email protected]>
---
 .../java/org/apache/zeppelin/dep/Repository.java   | 395 ++++++++++++++++++---
 .../apache/zeppelin/dep/RepositoryException.java   |  32 ++
 .../org/apache/zeppelin/dep/RepositoryTest.java    | 303 ++++++++++++++++
 .../apache/zeppelin/rest/InterpreterRestApi.java   |   3 +-
 .../interpreter/InterpreterInfoSaving.java         |  50 +--
 .../interpreter/InterpreterSettingManager.java     |  48 ++-
 .../interpreter/InterpreterInfoSavingTest.java     | 141 ++++++++
 .../interpreter/InterpreterSettingManagerTest.java |   8 +-
 8 files changed, 875 insertions(+), 105 deletions(-)

diff --git 
a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/Repository.java 
b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/Repository.java
index 83c6aaa1c7..7c9d1b1945 100644
--- a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/Repository.java
+++ b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/Repository.java
@@ -17,46 +17,87 @@
 
 package org.apache.zeppelin.dep;
 import static org.apache.commons.lang3.StringUtils.isNotBlank;
+import static org.apache.commons.lang3.StringUtils.isBlank;
 
 
 import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
 import org.apache.zeppelin.common.JsonSerializable;
 import org.eclipse.aether.repository.Authentication;
 import org.eclipse.aether.repository.Proxy;
+import org.eclipse.aether.repository.RemoteRepository;
+import org.eclipse.aether.repository.RepositoryPolicy;
 import org.eclipse.aether.util.repository.AuthenticationBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.regex.Pattern;
 
 /**
- *
- *
+ * Repository configuration for Maven dependency resolution.
+ * 
+ * <p>This class represents a Maven repository configuration that can be used
+ * for dependency resolution. It supports authentication, proxy settings,
+ * and both release and snapshot repositories.</p>
+ * 
+ * <p>All input parameters are validated to ensure configuration integrity:</p>
+ * <ul>
+ *   <li>Repository ID must contain only alphanumeric characters, dots, 
underscores, and hyphens</li>
+ *   <li>URL must be a valid HTTP, HTTPS, or FILE protocol URL</li>
+ *   <li>Credentials require both username and password</li>
+ *   <li>Proxy settings require valid protocol, host, and port</li>
+ * </ul>
+ * 
+ * <p>Example usage:</p>
+ * <pre>{@code
+ * Repository repo = new Repository.Builder("central")
+ *     .url("https://repo.maven.apache.org/maven2/";)
+ *     .snapshot()
+ *     .build();
+ * 
+ * Repository privateRepo = new Repository.Builder("private")
+ *     .url("https://private.repo/maven2/";)
+ *     .credentials("username", "password")
+ *     .proxy("HTTP", "proxy.host", 8080, "proxyUser", "proxyPass")
+ *     .build();
+ * }</pre>
+ * 
+ * @see RemoteRepository
+ * @see RepositoryException
  */
 public class Repository implements JsonSerializable {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(Repository.class);
   private static final Gson gson = new Gson();
+  private static final Pattern REPOSITORY_ID_PATTERN = 
Pattern.compile("^[a-zA-Z0-9._-]+$");
 
-  private boolean snapshot = false;
-  private String id;
-  private String url;
-  private String username = null;
-  private String password = null;
-  private String proxyProtocol = "HTTP";
-  private String proxyHost = null;
-  private Integer proxyPort = null;
-  private String proxyLogin = null;
-  private String proxyPassword = null;
-
-  public Repository(String id){
-    this.id = id;
-  }
-
-  public Repository url(String url) {
-    this.url = url;
-    return this;
-  }
+  private final boolean snapshot;
+  private final String id;
+  private final String url;
+  private final String username;
+  private final String password;
+  private final String proxyProtocol;
+  private final String proxyHost;
+  private final Integer proxyPort;
+  private final String proxyLogin;
+  private final String proxyPassword;
 
-  public Repository snapshot() {
-    snapshot = true;
-    return this;
+  /**
+   * Private constructor used by the Builder.
+   */
+  private Repository(Builder builder) {
+    this.id = builder.id;
+    this.url = builder.url;
+    this.snapshot = builder.snapshot;
+    this.username = builder.username;
+    this.password = builder.password;
+    this.proxyProtocol = builder.proxyProtocol;
+    this.proxyHost = builder.proxyHost;
+    this.proxyPort = builder.proxyPort;
+    this.proxyLogin = builder.proxyLogin;
+    this.proxyPassword = builder.proxyPassword;
   }
-
   public boolean isSnapshot() {
     return snapshot;
   }
@@ -69,22 +110,6 @@ public class Repository implements JsonSerializable {
     return url;
   }
   
-  public Repository username(String username) {
-    this.username = username;
-    return this;
-  }
-  
-  public Repository password(String password) {
-    this.password = password;
-    return this;
-  }
-  
-  public Repository credentials(String username, String password) {
-    this.username = username;
-    this.password = password;
-    return this;
-  }
-  
   public Authentication getAuthentication() {
     Authentication auth = null;
     if (this.username != null && this.password != null) {
@@ -109,7 +134,293 @@ public class Repository implements JsonSerializable {
     return gson.toJson(this);
   }
 
+  /**
+   * Creates a Repository instance from JSON string.
+   * 
+   * @param json the JSON string representing a Repository
+   * @return the Repository instance parsed from JSON
+   * @throws RepositoryException if the JSON is null, empty, invalid format, 
or contains invalid data
+   */
   public static Repository fromJson(String json) {
-    return gson.fromJson(json, Repository.class);
+    if (isBlank(json)) {
+      throw new RepositoryException("JSON string cannot be null or empty");
+    }
+    try {
+      Repository repository = gson.fromJson(json, Repository.class);
+      if (repository == null) {
+        throw new RepositoryException("Failed to parse JSON: resulted in null 
repository");
+      }
+      // Validate the parsed repository
+      validateRepository(repository);
+      return repository;
+    } catch (JsonSyntaxException e) {
+      LOGGER.error("Failed to parse Repository JSON: {}", json, e);
+      throw new RepositoryException("Invalid JSON format for Repository: " + 
e.getMessage(), e);
+    }
+  }
+
+  /**
+   * Converts this repository to Maven RemoteRepository.
+   * 
+   * @return the RemoteRepository instance configured from this Repository
+   * @throws RepositoryException if the repository ID or URL is missing
+   */
+  public RemoteRepository toRemoteRepository() {
+    validateForRemoteRepository();
+    RepositoryPolicy policy = new RepositoryPolicy(
+        true,
+        RepositoryPolicy.UPDATE_POLICY_DAILY,
+        RepositoryPolicy.CHECKSUM_POLICY_WARN);
+    RemoteRepository.Builder builder = new RemoteRepository.Builder(id, 
"default", url);
+    if (isSnapshot()) {
+      builder.setSnapshotPolicy(policy);
+    } else {
+      builder.setPolicy(policy);
+    }
+    if (getAuthentication() != null) {
+      builder.setAuthentication(getAuthentication());
+    }
+    if (getProxy() != null) {
+      builder.setProxy(getProxy());
+    }
+    return builder.build();
+  }
+
+  /**
+   * Creates a Repository instance from Maven RemoteRepository.
+   * 
+   * <p>Note: Credentials will not be populated because they are not 
accessible from RemoteRepository.</p>
+   * 
+   * @param repo the RemoteRepository to convert from
+   * @return the Repository instance created from the RemoteRepository
+   * @throws RepositoryException if the RemoteRepository is null
+   */
+  public static Repository fromRemoteRepository(RemoteRepository repo) {
+    if (repo == null) {
+      throw new RepositoryException("RemoteRepository cannot be null");
+    }
+    Builder builder = new Builder(repo.getId()).url(repo.getUrl());
+    if (repo.getPolicy(true) != null && repo.getPolicy(true).isEnabled()) {
+      builder.snapshot();
+    }
+    return builder.build();
+  }
+
+  // Validation methods
+  private static void validateId(String id) {
+    if (isBlank(id)) {
+      throw new RepositoryException("Repository ID cannot be null or empty");
+    }
+    if (!REPOSITORY_ID_PATTERN.matcher(id).matches()) {
+      throw new RepositoryException("Repository ID must contain only 
alphanumeric characters, dots, underscores, and hyphens: " + id);
+    }
+  }
+
+  private static void validateUrl(String url) {
+    if (isBlank(url)) {
+      throw new RepositoryException("Repository URL cannot be null or empty");
+    }
+    try {
+      URL parsedUrl = new URL(url);
+      String protocol = parsedUrl.getProtocol();
+      if (!"http".equalsIgnoreCase(protocol) && 
!"https".equalsIgnoreCase(protocol) && !"file".equalsIgnoreCase(protocol)) {
+        throw new RepositoryException("Repository URL must use HTTP, HTTPS, or 
FILE protocol, but was: " + protocol);
+      }
+    } catch (MalformedURLException e) {
+      throw new RepositoryException("Invalid URL format: " + url, e);
+    }
+  }
+
+  private static void validateCredentials(String username, String password) {
+    if (isBlank(username) && isNotBlank(password)) {
+      throw new RepositoryException("Username cannot be empty when password is 
provided");
+    }
+    if (isNotBlank(username) && isBlank(password)) {
+      throw new RepositoryException("Password cannot be empty when username is 
provided");
+    }
+  }
+
+  private static void validateProxy(String protocol, String host, int port) {
+    if (isBlank(protocol)) {
+      throw new RepositoryException("Proxy protocol cannot be null or empty");
+    }
+    if (isBlank(host)) {
+      throw new RepositoryException("Proxy host cannot be null or empty");
+    }
+    if (port <= 0 || port > 65535) {
+      throw new RepositoryException("Proxy port must be between 1 and 65535, 
but was: " + port);
+    }
+    if (!"HTTP".equalsIgnoreCase(protocol) && 
!"HTTPS".equalsIgnoreCase(protocol)) {
+      throw new RepositoryException("Proxy protocol must be HTTP or HTTPS, but 
was: " + protocol);
+    }
+  }
+
+  private static void validateRepository(Repository repository) {
+    if (isBlank(repository.getId())) {
+      throw new RepositoryException("Repository ID cannot be null or empty in 
parsed JSON");
+    }
+    // URL validation is optional for parsed repositories to maintain backward 
compatibility
+    if (isNotBlank(repository.getUrl())) {
+      validateUrl(repository.getUrl());
+    }
+  }
+
+  private void validateForRemoteRepository() {
+    if (isBlank(this.id)) {
+      throw new RepositoryException("Repository ID is required for 
RemoteRepository conversion");
+    }
+    if (isBlank(this.url)) {
+      throw new RepositoryException("Repository URL is required for 
RemoteRepository conversion");
+    }
+  }
+
+  /**
+   * Builder class for creating Repository instances.
+   * 
+   * <p>Example usage:</p>
+   * <pre>{@code
+   * Repository repo = new Repository.Builder("central")
+   *     .url("https://repo.maven.apache.org/maven2/";)
+   *     .snapshot()
+   *     .build();
+   * 
+   * Repository privateRepo = new Repository.Builder("private")
+   *     .url("https://private.repo/maven2/";)
+   *     .credentials("username", "password")
+   *     .proxy("HTTP", "proxy.host", 8080, "proxyUser", "proxyPass")
+   *     .build();
+   * }</pre>
+   */
+  public static class Builder {
+    private final String id;
+    private String url;
+    private boolean snapshot = false;
+    private String username = null;
+    private String password = null;
+    private String proxyProtocol = "HTTP";
+    private String proxyHost = null;
+    private Integer proxyPort = null;
+    private String proxyLogin = null;
+    private String proxyPassword = null;
+
+    /**
+     * Creates a new Builder with the specified repository ID.
+     * 
+     * @param id the repository ID, must contain only alphanumeric characters, 
dots, underscores, and hyphens
+     * @throws RepositoryException if the ID is null, empty, or contains 
invalid characters
+     */
+    public Builder(String id) {
+      validateId(id);
+      this.id = id;
+    }
+
+    /**
+     * Copies values from an existing Repository.
+     * 
+     * @param repository the repository to copy from
+     * @return this Builder instance for method chaining
+     */
+    Builder copyFrom(Repository repository) {
+      this.url = repository.url;
+      this.snapshot = repository.snapshot;
+      this.username = repository.username;
+      this.password = repository.password;
+      this.proxyProtocol = repository.proxyProtocol;
+      this.proxyHost = repository.proxyHost;
+      this.proxyPort = repository.proxyPort;
+      this.proxyLogin = repository.proxyLogin;
+      this.proxyPassword = repository.proxyPassword;
+      return this;
+    }
+
+    /**
+     * Sets the repository URL.
+     * 
+     * @param url the repository URL, must be a valid HTTP, HTTPS, or FILE 
protocol URL
+     * @return this Builder instance for method chaining
+     * @throws RepositoryException if the URL is null, empty, or has invalid 
format/protocol
+     */
+    public Builder url(String url) {
+      validateUrl(url);
+      this.url = url;
+      return this;
+    }
+
+    /**
+     * Marks the repository as a snapshot repository.
+     * 
+     * @return this Builder instance for method chaining
+     */
+    public Builder snapshot() {
+      this.snapshot = true;
+      return this;
+    }
+
+    /**
+     * Sets the username for authentication.
+     * 
+     * @param username the username for authentication
+     * @return this Builder instance for method chaining
+     */
+    public Builder username(String username) {
+      this.username = username;
+      return this;
+    }
+
+    /**
+     * Sets the password for authentication.
+     * 
+     * @param password the password for authentication
+     * @return this Builder instance for method chaining
+     */
+    public Builder password(String password) {
+      this.password = password;
+      return this;
+    }
+
+    /**
+     * Sets the credentials for authentication.
+     * 
+     * @param username the username for authentication
+     * @param password the password for authentication
+     * @return this Builder instance for method chaining
+     * @throws RepositoryException if credentials are incomplete
+     */
+    public Builder credentials(String username, String password) {
+      validateCredentials(username, password);
+      this.username = username;
+      this.password = password;
+      return this;
+    }
+
+    /**
+     * Sets the proxy configuration.
+     * 
+     * @param protocol the proxy protocol (HTTP or HTTPS)
+     * @param host the proxy host
+     * @param port the proxy port
+     * @param username the proxy username (optional)
+     * @param password the proxy password (optional)
+     * @return this Builder instance for method chaining
+     * @throws RepositoryException if proxy configuration is invalid
+     */
+    public Builder proxy(String protocol, String host, int port, String 
username, String password) {
+      validateProxy(protocol, host, port);
+      this.proxyProtocol = protocol;
+      this.proxyHost = host;
+      this.proxyPort = port;
+      this.proxyLogin = username;
+      this.proxyPassword = password;
+      return this;
+    }
+
+    /**
+     * Builds the Repository instance.
+     * 
+     * @return the configured Repository instance
+     */
+    public Repository build() {
+      return new Repository(this);
+    }
   }
 }
diff --git 
a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/RepositoryException.java
 
b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/RepositoryException.java
new file mode 100644
index 0000000000..aad455358c
--- /dev/null
+++ 
b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/dep/RepositoryException.java
@@ -0,0 +1,32 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.zeppelin.dep;
+
+/**
+ * Exception thrown when there are issues with Repository configuration or 
operations.
+ */
+public class RepositoryException extends RuntimeException {
+
+  public RepositoryException(String message) {
+    super(message);
+  }
+
+  public RepositoryException(String message, Throwable cause) {
+    super(message, cause);
+  }
+}
\ No newline at end of file
diff --git 
a/zeppelin-interpreter/src/test/java/org/apache/zeppelin/dep/RepositoryTest.java
 
b/zeppelin-interpreter/src/test/java/org/apache/zeppelin/dep/RepositoryTest.java
new file mode 100644
index 0000000000..4fb6aa6d59
--- /dev/null
+++ 
b/zeppelin-interpreter/src/test/java/org/apache/zeppelin/dep/RepositoryTest.java
@@ -0,0 +1,303 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.zeppelin.dep;
+
+import org.eclipse.aether.repository.RemoteRepository;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class RepositoryTest {
+
+  @Test
+  void testToRemoteRepository() {
+    // Test basic repository conversion
+    Repository repo = new Repository.Builder("test-repo")
+        .url("https://repo.maven.apache.org/maven2/";)
+        .build();
+    
+    RemoteRepository remoteRepo = repo.toRemoteRepository();
+    
+    assertEquals("test-repo", remoteRepo.getId());
+    assertEquals("https://repo.maven.apache.org/maven2/";, remoteRepo.getUrl());
+    assertEquals("default", remoteRepo.getContentType());
+    assertNotNull(remoteRepo.getPolicy(false));
+    assertTrue(remoteRepo.getPolicy(false).isEnabled());
+  }
+
+  @Test
+  void testToRemoteRepositoryWithSnapshot() {
+    Repository repo = new Repository.Builder("snapshot-repo")
+        .url("https://repo.maven.apache.org/maven2/";)
+        .snapshot()
+        .build();
+    
+    RemoteRepository remoteRepo = repo.toRemoteRepository();
+    
+    assertEquals("snapshot-repo", remoteRepo.getId());
+    assertTrue(remoteRepo.getPolicy(true).isEnabled());
+  }
+
+  @Test
+  void testToRemoteRepositoryWithAuthentication() {
+    Repository repo = new Repository.Builder("auth-repo")
+        .url("https://private.repo/maven2/";)
+        .credentials("user", "pass")
+        .build();
+    
+    RemoteRepository remoteRepo = repo.toRemoteRepository();
+    
+    assertNotNull(remoteRepo.getAuthentication());
+  }
+
+  @Test
+  void testToRemoteRepositoryWithProxy() {
+    Repository repo = new Repository.Builder("proxy-repo")
+        .url("https://repo.maven.apache.org/maven2/";)
+        .proxy("HTTP", "proxy.host", 8080, "proxyUser", "proxyPass")
+        .build();
+    
+    RemoteRepository remoteRepo = repo.toRemoteRepository();
+    
+    assertNotNull(remoteRepo.getProxy());
+    assertEquals("proxy.host", remoteRepo.getProxy().getHost());
+    assertEquals(8080, remoteRepo.getProxy().getPort());
+  }
+
+  @Test
+  void testFromRemoteRepository() {
+    RemoteRepository remoteRepo = new RemoteRepository.Builder("central", 
"default", 
+        "https://repo.maven.apache.org/maven2/";)
+        .setReleasePolicy(new 
org.eclipse.aether.repository.RepositoryPolicy(true, null, null))
+        .setSnapshotPolicy(new 
org.eclipse.aether.repository.RepositoryPolicy(false, null, null))
+        .build();
+    
+    Repository repo = Repository.fromRemoteRepository(remoteRepo);
+    
+    assertEquals("central", repo.getId());
+    assertEquals("https://repo.maven.apache.org/maven2/";, repo.getUrl());
+    assertFalse(repo.isSnapshot());
+  }
+
+  @Test
+  void testFromRemoteRepositoryWithSnapshot() {
+    RemoteRepository remoteRepo = new RemoteRepository.Builder("snapshots", 
"default", 
+        "https://repo.maven.apache.org/maven2/";)
+        .setSnapshotPolicy(new 
org.eclipse.aether.repository.RepositoryPolicy(true, null, null))
+        .build();
+    
+    Repository repo = Repository.fromRemoteRepository(remoteRepo);
+    
+    assertEquals("snapshots", repo.getId());
+    assertTrue(repo.isSnapshot());
+  }
+
+  @Test
+  void testRoundTripConversion() {
+    // Test that conversion is consistent (with data loss for auth/proxy)
+    Repository original = new Repository.Builder("test")
+        .url("https://test.repo/maven2/";)
+        .snapshot()
+        .build();
+    
+    RemoteRepository remote = original.toRemoteRepository();
+    Repository converted = Repository.fromRemoteRepository(remote);
+    
+    assertEquals(original.getId(), converted.getId());
+    assertEquals(original.getUrl(), converted.getUrl());
+    assertEquals(original.isSnapshot(), converted.isSnapshot());
+  }
+
+  @Test
+  void testJsonSerialization() {
+    Repository repo = new Repository.Builder("json-test")
+        .url("https://test.repo/";)
+        .credentials("user", "pass")
+        .proxy("HTTP", "proxy", 8080, "puser", "ppass")
+        .build();
+    
+    String json = repo.toJson();
+    Repository deserialized = Repository.fromJson(json);
+    
+    assertEquals(repo.getId(), deserialized.getId());
+    assertEquals(repo.getUrl(), deserialized.getUrl());
+    // Test that credentials are preserved in JSON
+    assertNotNull(deserialized.getAuthentication());
+    assertNotNull(deserialized.getProxy());
+  }
+
+  // Input validation tests
+  @Test
+  void testInvalidRepositoryId() {
+    // Test null ID
+    assertThrows(RepositoryException.class, () -> new 
Repository.Builder(null));
+    
+    // Test empty ID
+    assertThrows(RepositoryException.class, () -> new Repository.Builder(""));
+    
+    // Test invalid characters in ID
+    assertThrows(RepositoryException.class, () -> new 
Repository.Builder("repo@invalid"));
+    assertThrows(RepositoryException.class, () -> new Repository.Builder("repo 
with spaces"));
+    assertThrows(RepositoryException.class, () -> new 
Repository.Builder("repo/with/slash"));
+  }
+
+  @Test
+  void testValidRepositoryId() {
+    // Test valid IDs
+    assertDoesNotThrow(() -> new Repository.Builder("central").build());
+    assertDoesNotThrow(() -> new Repository.Builder("my-repo").build());
+    assertDoesNotThrow(() -> new Repository.Builder("repo_123").build());
+    assertDoesNotThrow(() -> new Repository.Builder("repo.with.dots").build());
+    assertDoesNotThrow(() -> new Repository.Builder("123-repo-456").build());
+  }
+
+  @Test
+  void testInvalidUrl() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test null URL
+    assertThrows(RepositoryException.class, () -> builder.url(null));
+    
+    // Test empty URL
+    assertThrows(RepositoryException.class, () -> builder.url(""));
+    
+    // Test invalid URL format
+    assertThrows(RepositoryException.class, () -> builder.url("not-a-url"));
+    assertThrows(RepositoryException.class, () -> 
builder.url("ftp://invalid-protocol";));
+  }
+
+  @Test
+  void testValidUrl() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test valid URLs
+    assertDoesNotThrow(() -> 
builder.url("https://repo.maven.apache.org/maven2/";).build());
+    assertDoesNotThrow(() -> 
builder.url("http://localhost:8080/nexus/";).build());
+    assertDoesNotThrow(() -> 
builder.url("file:///home/user/.m2/repository/").build());
+  }
+
+  @Test
+  void testInvalidCredentials() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test username without password
+    assertThrows(RepositoryException.class, () -> builder.credentials("user", 
null));
+    assertThrows(RepositoryException.class, () -> builder.credentials("user", 
""));
+    
+    // Test password without username
+    assertThrows(RepositoryException.class, () -> builder.credentials(null, 
"pass"));
+    assertThrows(RepositoryException.class, () -> builder.credentials("", 
"pass"));
+  }
+
+  @Test
+  void testValidCredentials() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test valid credentials
+    assertDoesNotThrow(() -> builder.credentials("user", "pass").build());
+    assertDoesNotThrow(() -> builder.credentials(null, null).build());
+  }
+
+  @Test
+  void testInvalidProxy() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test invalid protocol
+    assertThrows(RepositoryException.class, () -> builder.proxy("FTP", 
"proxy.host", 8080, null, null));
+    assertThrows(RepositoryException.class, () -> builder.proxy(null, 
"proxy.host", 8080, null, null));
+    assertThrows(RepositoryException.class, () -> builder.proxy("", 
"proxy.host", 8080, null, null));
+    
+    // Test invalid host
+    assertThrows(RepositoryException.class, () -> builder.proxy("HTTP", null, 
8080, null, null));
+    assertThrows(RepositoryException.class, () -> builder.proxy("HTTP", "", 
8080, null, null));
+    
+    // Test invalid port
+    assertThrows(RepositoryException.class, () -> builder.proxy("HTTP", 
"proxy.host", 0, null, null));
+    assertThrows(RepositoryException.class, () -> builder.proxy("HTTP", 
"proxy.host", -1, null, null));
+    assertThrows(RepositoryException.class, () -> builder.proxy("HTTP", 
"proxy.host", 65536, null, null));
+  }
+
+  @Test
+  void testValidProxy() {
+    Repository.Builder builder = new Repository.Builder("test");
+    
+    // Test valid proxy configurations
+    assertDoesNotThrow(() -> builder.proxy("HTTP", "proxy.host", 8080, null, 
null).build());
+    assertDoesNotThrow(() -> new Repository.Builder("test2").proxy("HTTPS", 
"proxy.host", 443, "user", "pass").build());
+    assertDoesNotThrow(() -> new Repository.Builder("test3").proxy("http", 
"proxy.host", 3128, null, null).build()); // case insensitive
+  }
+
+  @Test
+  void testInvalidJsonDeserialization() {
+    // Test null JSON
+    assertThrows(RepositoryException.class, () -> Repository.fromJson(null));
+    
+    // Test empty JSON
+    assertThrows(RepositoryException.class, () -> Repository.fromJson(""));
+    
+    // Test invalid JSON format
+    assertThrows(RepositoryException.class, () -> 
Repository.fromJson("not-json"));
+    assertThrows(RepositoryException.class, () -> 
Repository.fromJson("{invalid json}"));
+    
+    // Test JSON that results in null
+    assertThrows(RepositoryException.class, () -> Repository.fromJson("null"));
+  }
+
+  @Test
+  void testValidJsonDeserialization() {
+    String validJson = 
"{\"id\":\"test\",\"url\":\"https://repo.maven.apache.org/maven2/\",\"snapshot\":false}";;
+    
+    assertDoesNotThrow(() -> {
+      Repository repo = Repository.fromJson(validJson);
+      assertEquals("test", repo.getId());
+      assertEquals("https://repo.maven.apache.org/maven2/";, repo.getUrl());
+      assertFalse(repo.isSnapshot());
+    });
+  }
+
+  @Test
+  void testToRemoteRepositoryValidation() {
+    // Test with missing URL
+    Repository repo = new Repository.Builder("test").build();
+    assertThrows(RepositoryException.class, () -> repo.toRemoteRepository());
+    
+    // Test with valid repository
+    Repository validRepo = new Repository.Builder("test")
+        .url("https://repo.maven.apache.org/maven2/";)
+        .build();
+    assertDoesNotThrow(() -> validRepo.toRemoteRepository());
+  }
+
+  @Test
+  void testFromRemoteRepositoryValidation() {
+    // Test with null RemoteRepository
+    assertThrows(RepositoryException.class, () -> 
Repository.fromRemoteRepository(null));
+  }
+
+  @Test
+  void testBackwardCompatibilityWithEmptyUrl() {
+    // Test that repositories with empty URLs can be parsed (for backward 
compatibility)
+    String jsonWithoutUrl = "{\"id\":\"test\",\"snapshot\":false}";
+    
+    assertDoesNotThrow(() -> {
+      Repository repo = Repository.fromJson(jsonWithoutUrl);
+      assertEquals("test", repo.getId());
+      assertNull(repo.getUrl());
+    });
+  }
+}
\ No newline at end of file
diff --git 
a/zeppelin-server/src/main/java/org/apache/zeppelin/rest/InterpreterRestApi.java
 
b/zeppelin-server/src/main/java/org/apache/zeppelin/rest/InterpreterRestApi.java
index 00158d3309..3b9d754e91 100644
--- 
a/zeppelin-server/src/main/java/org/apache/zeppelin/rest/InterpreterRestApi.java
+++ 
b/zeppelin-server/src/main/java/org/apache/zeppelin/rest/InterpreterRestApi.java
@@ -261,8 +261,7 @@ public class InterpreterRestApi extends AbstractRestApi {
   public Response addRepository(String message) {
     try {
       Repository request = Repository.fromJson(message);
-      interpreterSettingManager.addRepository(request.getId(), 
request.getUrl(),
-          request.isSnapshot(), request.getAuthentication(), 
request.getProxy());
+      interpreterSettingManager.addRepository(request);
       LOGGER.info("New repository {} added", request.getId());
     } catch (Exception e) {
       LOGGER.error("Exception in InterpreterRestApi while adding repository ", 
e);
diff --git 
a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterInfoSaving.java
 
b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterInfoSaving.java
index 4ecb9c795a..61b58979db 100644
--- 
a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterInfoSaving.java
+++ 
b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterInfoSaving.java
@@ -19,20 +19,13 @@ package org.apache.zeppelin.interpreter;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
-import com.google.gson.JsonDeserializationContext;
-import com.google.gson.JsonDeserializer;
-import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
-import com.google.gson.JsonParseException;
 import com.google.gson.JsonParser;
-import com.google.gson.JsonSerializationContext;
-import com.google.gson.JsonSerializer;
 import org.apache.commons.io.IOUtils;
 import org.apache.zeppelin.common.JsonSerializable;
-import org.eclipse.aether.repository.Authentication;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.eclipse.aether.repository.RemoteRepository;
+import org.apache.zeppelin.dep.Repository;
 
 import java.io.BufferedReader;
 import java.io.FileOutputStream;
@@ -54,13 +47,11 @@ public class InterpreterInfoSaving implements 
JsonSerializable {
 
   private static final Logger LOGGER = 
LoggerFactory.getLogger(InterpreterInfoSaving.class);
 
-  // Authentication is an interface so that we need to create an 
InterfaceAdapter for that.
   private static final Gson GSON =  new GsonBuilder().setPrettyPrinting()
-          .registerTypeAdapter(Authentication.class, new 
InterfaceAdapter<Authentication>())
           .create();
 
   public Map<String, InterpreterSetting> interpreterSettings = new HashMap<>();
-  public List<RemoteRepository> interpreterRepositories = new ArrayList<>();
+  public List<Repository> interpreterRepositories = new ArrayList<>();
 
   public static InterpreterInfoSaving loadFromFile(Path file) throws 
IOException {
     LOGGER.info("Load interpreter setting from file: {}", file);
@@ -104,40 +95,5 @@ public class InterpreterInfoSaving implements 
JsonSerializable {
     return GSON.fromJson(json, InterpreterInfoSaving.class);
   }
 
-  static class InterfaceAdapter<T> implements JsonSerializer<T>, 
JsonDeserializer<T> {
-    @Override
-    public JsonElement serialize(T object, Type interfaceType, 
JsonSerializationContext context) {
-      final JsonObject wrapper = new JsonObject();
-      wrapper.addProperty("type", object.getClass().getName());
-      wrapper.add("data", context.serialize(object));
-      return wrapper;
-    }
-
-    @Override
-    public T deserialize(JsonElement elem,
-                         Type interfaceType,
-                         JsonDeserializationContext context) throws 
JsonParseException {
-      final JsonObject wrapper = (JsonObject) elem;
-      final JsonElement typeName = get(wrapper, "type");
-      final JsonElement data = get(wrapper, "data");
-      final Type actualType = typeForName(typeName);
-      return context.deserialize(data, actualType);
-    }
-
-    private Type typeForName(final JsonElement typeElem) {
-      try {
-        return Class.forName(typeElem.getAsString());
-      } catch (ClassNotFoundException e) {
-        throw new JsonParseException(e);
-      }
-    }
-
-    private JsonElement get(final JsonObject wrapper, String memberName) {
-      final JsonElement elem = wrapper.get(memberName);
-      if (elem == null)
-        throw new JsonParseException("no '" + memberName +
-                "' member found in what was expected to be an interface 
wrapper");
-      return elem;
-    }
-  }
+  // kept for backward compatibility: no custom serializers are needed 
currently
 }
diff --git 
a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
 
b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
index 434d950312..1f25479aa9 100644
--- 
a/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
+++ 
b/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSettingManager.java
@@ -72,6 +72,7 @@ import org.slf4j.LoggerFactory;
 import org.eclipse.aether.repository.Proxy;
 import org.eclipse.aether.repository.RemoteRepository;
 import org.eclipse.aether.repository.Authentication;
+import org.apache.zeppelin.dep.Repository;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -129,7 +130,7 @@ public class InterpreterSettingManager implements 
NoteEventListener {
     new ConcurrentHashMap<>());
   private final Map<String, List<Meter>> interpreterSettingsMeters = new 
ConcurrentHashMap<>();
 
-  private final List<RemoteRepository> interpreterRepositories;
+  private final List<Repository> interpreterRepositories;
   private InterpreterOption defaultOption;
   private String defaultInterpreterGroup;
   private final Gson gson;
@@ -178,7 +179,10 @@ public class InterpreterSettingManager implements 
NoteEventListener {
     LOGGER.debug("InterpreterRootPath: {}", interpreterDirPath);
     this.dependencyResolver =
         new 
DependencyResolver(zConf.getString(ConfVars.ZEPPELIN_INTERPRETER_LOCALREPO), 
zConf);
-    this.interpreterRepositories = dependencyResolver.getRepos();
+    this.interpreterRepositories = new ArrayList<>();
+    for (RemoteRepository repo : dependencyResolver.getRepos()) {
+      this.interpreterRepositories.add(Repository.fromRemoteRepository(repo));
+    }
     this.defaultInterpreterGroup = 
zConf.getString(ConfVars.ZEPPELIN_INTERPRETER_GROUP_DEFAULT);
     this.gson = new GsonBuilder().setPrettyPrinting().create();
 
@@ -309,10 +313,17 @@ public class InterpreterSettingManager implements 
NoteEventListener {
     }
 
     if (infoSaving.interpreterRepositories != null) {
-      for (RemoteRepository repo : infoSaving.interpreterRepositories) {
-        if (!dependencyResolver.getRepos().contains(repo)) {
-          this.interpreterRepositories.add(repo);
-        }
+      for (Repository repo : infoSaving.interpreterRepositories) {
+        // Remove existing repository with same ID (last one wins)
+        this.interpreterRepositories.removeIf(r -> 
r.getId().equals(repo.getId()));
+        
+        // Add the repository
+        this.interpreterRepositories.add(repo);
+        
+        // Update dependency resolver
+        dependencyResolver.delRepo(repo.getId());
+        dependencyResolver.addRepo(repo.getId(), repo.getUrl(), 
repo.isSnapshot(),
+                repo.getAuthentication(), repo.getProxy());
       }
 
       // force interpreter dependencies loading once the
@@ -898,17 +909,30 @@ public class InterpreterSettingManager implements 
NoteEventListener {
   }
 
   public List<RemoteRepository> getRepositories() {
-    return this.interpreterRepositories;
-  }
-
-  public void addRepository(String id, String url, boolean snapshot, 
Authentication auth,
-      Proxy proxy) throws IOException {
-    dependencyResolver.addRepo(id, url, snapshot, auth, proxy);
+    List<RemoteRepository> repos = new ArrayList<>();
+    for (Repository r : this.interpreterRepositories) {
+      repos.add(r.toRemoteRepository());
+    }
+    return repos;
+  }
+
+  public void addRepository(Repository repository) throws IOException {
+    // Remove existing repository with same ID (last one wins)
+    interpreterRepositories.removeIf(r -> 
r.getId().equals(repository.getId()));
+    
+    // Add the repository
+    interpreterRepositories.add(repository);
+    
+    // Update dependency resolver
+    dependencyResolver.delRepo(repository.getId());
+    dependencyResolver.addRepo(repository.getId(), repository.getUrl(), 
repository.isSnapshot(),
+            repository.getAuthentication(), repository.getProxy());
     saveToFile();
   }
 
   public void removeRepository(String id) throws IOException {
     dependencyResolver.delRepo(id);
+    interpreterRepositories.removeIf(r -> r.getId().equals(id));
     saveToFile();
   }
 
diff --git 
a/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterInfoSavingTest.java
 
b/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterInfoSavingTest.java
new file mode 100644
index 0000000000..0adfe0c598
--- /dev/null
+++ 
b/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterInfoSavingTest.java
@@ -0,0 +1,141 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.zeppelin.interpreter;
+
+import org.apache.zeppelin.dep.Repository;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.HashMap;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class InterpreterInfoSavingTest {
+
+  @TempDir
+  Path tempDir;
+
+  @Test
+  void testSaveAndLoad() throws IOException {
+    // Create a new InterpreterInfoSaving
+    InterpreterInfoSaving infoSaving = new InterpreterInfoSaving();
+    
+    // Add some repositories
+    Repository repo1 = new Repository.Builder("central")
+        .url("https://repo.maven.apache.org/maven2/";)
+        .build();
+    
+    Repository repo2 = new Repository.Builder("local")
+        .url("file:///home/user/.m2/repository/")
+        .snapshot()
+        .build();
+    
+    infoSaving.interpreterRepositories.add(repo1);
+    infoSaving.interpreterRepositories.add(repo2);
+    
+    // Save to file
+    Path file = tempDir.resolve("interpreter.json");
+    infoSaving.saveToFile(file);
+    
+    // Load from file
+    InterpreterInfoSaving loaded = InterpreterInfoSaving.loadFromFile(file);
+    
+    // Verify
+    assertNotNull(loaded);
+    assertEquals(2, loaded.interpreterRepositories.size());
+    
+    Repository loadedRepo1 = loaded.interpreterRepositories.get(0);
+    assertEquals("central", loadedRepo1.getId());
+    assertEquals("https://repo.maven.apache.org/maven2/";, 
loadedRepo1.getUrl());
+    assertFalse(loadedRepo1.isSnapshot());
+    
+    Repository loadedRepo2 = loaded.interpreterRepositories.get(1);
+    assertEquals("local", loadedRepo2.getId());
+    assertEquals("file:///home/user/.m2/repository/", loadedRepo2.getUrl());
+    assertTrue(loadedRepo2.isSnapshot());
+  }
+
+  @Test
+  void testJsonSerialization() {
+    InterpreterInfoSaving infoSaving = new InterpreterInfoSaving();
+    
+    Repository repo = new Repository.Builder("test-repo")
+        .url("https://test.repo/maven2/";)
+        .credentials("user", "pass")
+        .build();
+    
+    infoSaving.interpreterRepositories.add(repo);
+    infoSaving.interpreterSettings = new HashMap<>();
+    
+    // Serialize to JSON
+    String json = infoSaving.toJson();
+    
+    // Deserialize from JSON
+    InterpreterInfoSaving deserialized = InterpreterInfoSaving.fromJson(json);
+    
+    assertNotNull(deserialized);
+    assertEquals(1, deserialized.interpreterRepositories.size());
+    assertEquals("test-repo", 
deserialized.interpreterRepositories.get(0).getId());
+  }
+
+  @Test
+  void testBackwardCompatibility() throws IOException {
+    // This test simulates loading an older format interpreter.json
+    // that might have RemoteRepository serialized with InterfaceAdapter
+    
+    String oldFormatJson = "{\n" +
+        "  \"interpreterSettings\": {},\n" +
+        "  \"interpreterRepositories\": [\n" +
+        "    {\n" +
+        "      \"snapshot\": false,\n" +
+        "      \"id\": \"central\",\n" +
+        "      \"url\": \"https://repo.maven.apache.org/maven2/\"\n"; +
+        "    },\n" +
+        "    {\n" +
+        "      \"snapshot\": true,\n" +
+        "      \"id\": \"apache-snapshots\",\n" +
+        "      \"url\": \"https://repository.apache.org/snapshots/\"\n"; +
+        "    }\n" +
+        "  ]\n" +
+        "}";
+    
+    Path file = tempDir.resolve("old-interpreter.json");
+    Files.write(file, oldFormatJson.getBytes(StandardCharsets.UTF_8));
+    
+    // This should successfully load the old format
+    InterpreterInfoSaving loaded = InterpreterInfoSaving.loadFromFile(file);
+    
+    assertNotNull(loaded);
+    assertEquals(2, loaded.interpreterRepositories.size());
+    
+    // Verify the repositories were loaded correctly
+    Repository repo1 = loaded.interpreterRepositories.get(0);
+    assertEquals("central", repo1.getId());
+    assertEquals("https://repo.maven.apache.org/maven2/";, repo1.getUrl());
+    assertFalse(repo1.isSnapshot());
+    
+    Repository repo2 = loaded.interpreterRepositories.get(1);
+    assertEquals("apache-snapshots", repo2.getId());
+    assertEquals("https://repository.apache.org/snapshots/";, repo2.getUrl());
+    assertTrue(repo2.isSnapshot());
+  }
+}
\ No newline at end of file
diff --git 
a/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterSettingManagerTest.java
 
b/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterSettingManagerTest.java
index 9a73352fb4..54d3ffaeb0 100644
--- 
a/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterSettingManagerTest.java
+++ 
b/zeppelin-zengine/src/test/java/org/apache/zeppelin/interpreter/InterpreterSettingManagerTest.java
@@ -83,7 +83,9 @@ class InterpreterSettingManagerTest extends 
AbstractInterpreterTest {
 
     List<RemoteRepository> repositories = 
interpreterSettingManager.getRepositories();
     assertEquals(2, repositories.size());
-    assertEquals("central", repositories.get(0).getId());
+    // After loading from file, central repository is replaced and moved to 
the end
+    assertEquals("local", repositories.get(0).getId());
+    assertEquals("central", repositories.get(1).getId());
 
     // Load it again
     InterpreterSettingManager interpreterSettingManager2 = new 
InterpreterSettingManager(zConf,
@@ -104,7 +106,9 @@ class InterpreterSettingManagerTest extends 
AbstractInterpreterTest {
 
     repositories = interpreterSettingManager2.getRepositories();
     assertEquals(2, repositories.size());
-    assertEquals("central", repositories.get(0).getId());
+    // After loading from file, central repository is replaced and moved to 
the end
+    assertEquals("local", repositories.get(0).getId());
+    assertEquals("central", repositories.get(1).getId());
 
   }
 

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