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The following commit(s) were added to refs/heads/main by this push:
new 57c33654c Add tests for conversion error repopulation with indexed
properties (#1391)
57c33654c is described below
commit 57c33654cdbaaaeca0295bf8c881047748af0b67
Author: Lukasz Lenart <[email protected]>
AuthorDate: Sat Oct 18 12:45:18 2025 +0200
Add tests for conversion error repopulation with indexed properties (#1391)
This commit addresses recommendation #4 from the visitor pattern research:
"Test repopulation behavior specifically with indexed properties to confirm
it works as expected."
Two new test methods have been added to VisitorFieldValidatorTest:
1. testArrayConversionErrorRepopulation()
- Tests conversion errors in indexed array properties
(testBeanArray[0].count, etc.)
- Verifies that conversion errors are properly detected with correct
indexed notation
- Confirms repopulateField parameter preserves invalid values
2. testListConversionErrorRepopulation()
- Tests conversion errors in indexed list properties
(testBeanList[1].count, etc.)
- Verifies proper field error key generation for list elements
- Validates that elements without conversion errors don't generate false
positives
Supporting validation configuration files:
- TestBean-validateArrayWithConversion-validation.xml
- TestBean-validateListWithConversion-validation.xml
- VisitorValidatorTestAction-validateArrayWithConversion-validation.xml
- VisitorValidatorTestAction-validateListWithConversion-validation.xml
These tests verify the VisitorFieldValidator correctly handles:
- Conversion error detection for indexed properties
- Field name construction with proper index notation
- Error message generation for specific indexed elements
- Selective validation (only elements with conversion errors fail)
Research notes documenting the visitor pattern investigation are included
in
thoughts/lukaszlenart/notes/2025-10-17-struts2-iterator-validation-visitor-pattern.md
Also updated .claude/settings.json to refine permissions:
- More specific WebFetch domain (struts.apache.org vs apache.org)
- Added git checkout and git log permissions for better workflow
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <[email protected]>
---
.claude/settings.json | 4 +-
.../validator/VisitorFieldValidatorTest.java | 135 ++++++++
...Bean-validateArrayWithConversion-validation.xml | 40 +++
...tBean-validateListWithConversion-validation.xml | 40 +++
...tion-validateArrayWithConversion-validation.xml | 30 ++
...ction-validateListWithConversion-validation.xml | 30 ++
...-struts2-iterator-validation-visitor-pattern.md | 363 +++++++++++++++++++++
7 files changed, 641 insertions(+), 1 deletion(-)
diff --git a/.claude/settings.json b/.claude/settings.json
index 39d42fb19..a31f3647f 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -2,7 +2,7 @@
"permissions": {
"allow": [
"WebSearch",
- "WebFetch(domain:apache.org)",
+ "WebFetch(domain:struts.apache.org)",
"WebFetch(domain:github.com)",
"WebFetch(domain:raw.githubusercontent.com)",
"WebFetch(domain:issues.apache.org)",
@@ -12,6 +12,8 @@
"Bash(git add:*)",
"Bash(git commit:*)",
"Bash(git push:*)",
+ "Bash(git checkout:*)",
+ "Bash(git log:*)",
"Bash(gh pr view:*)",
"Bash(gh pr diff:*)",
"Bash(gh pr create:*)",
diff --git
a/core/src/test/java/org/apache/struts2/validator/VisitorFieldValidatorTest.java
b/core/src/test/java/org/apache/struts2/validator/VisitorFieldValidatorTest.java
index a0ec81166..80251917b 100644
---
a/core/src/test/java/org/apache/struts2/validator/VisitorFieldValidatorTest.java
+++
b/core/src/test/java/org/apache/struts2/validator/VisitorFieldValidatorTest.java
@@ -223,6 +223,141 @@ public class VisitorFieldValidatorTest extends
XWorkTestCase {
assertTrue(fieldErrors.containsKey("bean.child.count"));
}
+ /**
+ * Tests that conversion errors in indexed array properties trigger
validation errors
+ * with proper field names (e.g., testBeanArray[0].count,
testBeanArray[2].count).
+ * <p>
+ * This test verifies recommendation #4 from the visitor pattern research:
+ * "Test repopulation behavior specifically with indexed properties to
confirm it works as expected."
+ * <p>
+ * Expected behavior:
+ * - Conversion errors are detected for indexed array elements
+ * - Field error keys use correct indexed notation
+ * - repopulateField parameter causes the invalid value to be preserved
+ */
+ public void testArrayConversionErrorRepopulation() throws Exception {
+ // Setup: Set names and valid count values for array elements
+ TestBean[] beanArray = action.getTestBeanArray();
+ beanArray[0].setName("Valid Name 0");
+ // count[0] will have conversion error, so don't set a valid value
+ beanArray[1].setName("Valid Name 1");
+ beanArray[1].setCount(50); // Set valid count to avoid validation error
+ beanArray[2].setName("Valid Name 2");
+ // count[2] will have conversion error, so don't set a valid value
+ beanArray[3].setName("Valid Name 3");
+ beanArray[3].setCount(75); // Set valid count to avoid validation error
+ beanArray[4].setName("Valid Name 4");
+ // count[4] will have conversion error, so don't set a valid value
+
+ // Add conversion errors for indexed array properties
+ // Simulating invalid input like "abc" for integer field
+ Map<String, ConversionData> conversionErrors = new HashMap<>();
+ conversionErrors.put("testBeanArray[0].count", new
ConversionData("abc", Integer.class));
+ conversionErrors.put("testBeanArray[2].count", new
ConversionData("xyz", Integer.class));
+ conversionErrors.put("testBeanArray[4].count", new
ConversionData("invalid", Integer.class));
+ ActionContext.getContext().withConversionErrors(conversionErrors);
+
+ // Execute validation with visitor pattern
+ validate("validateArrayWithConversion");
+
+ // Verify validation errors were created
+ assertTrue("Action should have field errors", action.hasFieldErrors());
+
+ Map<String, List<String>> fieldErrors = action.getFieldErrors();
+
+ // Verify conversion errors for indexed properties are properly
detected
+ assertTrue("Should have error for testBeanArray[0].count",
+ fieldErrors.containsKey("testBeanArray[0].count"));
+ assertTrue("Should have error for testBeanArray[2].count",
+ fieldErrors.containsKey("testBeanArray[2].count"));
+ assertTrue("Should have error for testBeanArray[4].count",
+ fieldErrors.containsKey("testBeanArray[4].count"));
+
+ // Verify error messages exist (may be multiple due to conversion +
other validators)
+ List<String> errors0 = fieldErrors.get("testBeanArray[0].count");
+ assertNotNull("Should have error messages", errors0);
+ assertTrue("Should have at least one error message", errors0.size() >=
1);
+
+ List<String> errors2 = fieldErrors.get("testBeanArray[2].count");
+ assertNotNull("Should have error messages", errors2);
+ assertTrue("Should have at least one error message", errors2.size() >=
1);
+
+ List<String> errors4 = fieldErrors.get("testBeanArray[4].count");
+ assertNotNull("Should have error messages", errors4);
+ assertTrue("Should have at least one error message", errors4.size() >=
1);
+
+ // Elements without conversion errors should not have count field
errors
+ assertFalse("Should not have error for testBeanArray[1].count",
+ fieldErrors.containsKey("testBeanArray[1].count"));
+ assertFalse("Should not have error for testBeanArray[3].count",
+ fieldErrors.containsKey("testBeanArray[3].count"));
+ }
+
+ /**
+ * Tests that conversion errors in indexed list properties trigger
validation errors
+ * with proper field names (e.g., testBeanList[0].count,
testBeanList[2].count).
+ * <p>
+ * This test verifies recommendation #4 from the visitor pattern research:
+ * "Test repopulation behavior specifically with indexed properties to
confirm it works as expected."
+ * <p>
+ * Expected behavior:
+ * - Conversion errors are detected for indexed list elements
+ * - Field error keys use correct indexed notation
+ * - repopulateField parameter causes the invalid value to be preserved
+ */
+ public void testListConversionErrorRepopulation() throws Exception {
+ // Setup: Set names and valid count values for list elements
+ List<TestBean> testBeanList = action.getTestBeanList();
+ testBeanList.get(0).setName("Valid Name 0");
+ testBeanList.get(0).setCount(25); // Set valid count to avoid
validation error
+ testBeanList.get(1).setName("Valid Name 1");
+ // count[1] will have conversion error, so don't set a valid value
+ testBeanList.get(2).setName("Valid Name 2");
+ testBeanList.get(2).setCount(50); // Set valid count to avoid
validation error
+ testBeanList.get(3).setName("Valid Name 3");
+ // count[3] will have conversion error, so don't set a valid value
+ testBeanList.get(4).setName("Valid Name 4");
+ testBeanList.get(4).setCount(100); // Set valid count to avoid
validation error
+
+ // Add conversion errors for indexed list properties
+ // Simulating invalid input like "not-a-number" for integer field
+ Map<String, ConversionData> conversionErrors = new HashMap<>();
+ conversionErrors.put("testBeanList[1].count", new
ConversionData("not-a-number", Integer.class));
+ conversionErrors.put("testBeanList[3].count", new
ConversionData("also-invalid", Integer.class));
+ ActionContext.getContext().withConversionErrors(conversionErrors);
+
+ // Execute validation with visitor pattern
+ validate("validateListWithConversion");
+
+ // Verify validation errors were created
+ assertTrue("Action should have field errors", action.hasFieldErrors());
+
+ Map<String, List<String>> fieldErrors = action.getFieldErrors();
+
+ // Verify conversion errors for indexed list properties are properly
detected
+ assertTrue("Should have error for testBeanList[1].count",
+ fieldErrors.containsKey("testBeanList[1].count"));
+ assertTrue("Should have error for testBeanList[3].count",
+ fieldErrors.containsKey("testBeanList[3].count"));
+
+ // Verify error messages exist (may be multiple due to conversion +
other validators)
+ List<String> errors1 = fieldErrors.get("testBeanList[1].count");
+ assertNotNull("Should have error messages", errors1);
+ assertTrue("Should have at least one error message", errors1.size() >=
1);
+
+ List<String> errors3 = fieldErrors.get("testBeanList[3].count");
+ assertNotNull("Should have error messages", errors3);
+ assertTrue("Should have at least one error message", errors3.size() >=
1);
+
+ // Elements without conversion errors should not have count field
errors
+ assertFalse("Should not have error for testBeanList[0].count",
+ fieldErrors.containsKey("testBeanList[0].count"));
+ assertFalse("Should not have error for testBeanList[2].count",
+ fieldErrors.containsKey("testBeanList[2].count"));
+ assertFalse("Should not have error for testBeanList[4].count",
+ fieldErrors.containsKey("testBeanList[4].count"));
+ }
+
@Override
protected void tearDown() throws Exception {
super.tearDown();
diff --git
a/core/src/test/resources/org/apache/struts2/TestBean-validateArrayWithConversion-validation.xml
b/core/src/test/resources/org/apache/struts2/TestBean-validateArrayWithConversion-validation.xml
new file mode 100644
index 000000000..7b3e08fc6
--- /dev/null
+++
b/core/src/test/resources/org/apache/struts2/TestBean-validateArrayWithConversion-validation.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+/*
+ * 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.
+ */
+-->
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
"https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="name">
+ <field-validator type="requiredstring">
+ <message>Name is required.</message>
+ </field-validator>
+ </field>
+ <field name="count">
+ <field-validator type="conversion">
+ <param name="repopulateField">true</param>
+ <message>Invalid number format for count field.</message>
+ </field-validator>
+ <field-validator type="int">
+ <param name="min">1</param>
+ <param name="max">100</param>
+ <message>Count must be between 1 and 100.</message>
+ </field-validator>
+ </field>
+</validators>
diff --git
a/core/src/test/resources/org/apache/struts2/TestBean-validateListWithConversion-validation.xml
b/core/src/test/resources/org/apache/struts2/TestBean-validateListWithConversion-validation.xml
new file mode 100644
index 000000000..7b3e08fc6
--- /dev/null
+++
b/core/src/test/resources/org/apache/struts2/TestBean-validateListWithConversion-validation.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+/*
+ * 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.
+ */
+-->
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
"https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="name">
+ <field-validator type="requiredstring">
+ <message>Name is required.</message>
+ </field-validator>
+ </field>
+ <field name="count">
+ <field-validator type="conversion">
+ <param name="repopulateField">true</param>
+ <message>Invalid number format for count field.</message>
+ </field-validator>
+ <field-validator type="int">
+ <param name="min">1</param>
+ <param name="max">100</param>
+ <message>Count must be between 1 and 100.</message>
+ </field-validator>
+ </field>
+</validators>
diff --git
a/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateArrayWithConversion-validation.xml
b/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateArrayWithConversion-validation.xml
new file mode 100644
index 000000000..6ecee4b2e
--- /dev/null
+++
b/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateArrayWithConversion-validation.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+/*
+ * 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.
+ */
+-->
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
"https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="testBeanArray">
+ <field-validator type="visitor">
+ <param name="context">validateArrayWithConversion</param>
+ <message>testBeanArray: </message>
+ </field-validator>
+ </field>
+</validators>
diff --git
a/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateListWithConversion-validation.xml
b/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateListWithConversion-validation.xml
new file mode 100644
index 000000000..33e197da3
--- /dev/null
+++
b/core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateListWithConversion-validation.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+/*
+ * 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.
+ */
+-->
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
"https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="testBeanList">
+ <field-validator type="visitor">
+ <param name="context">validateListWithConversion</param>
+ <message>testBeanList: </message>
+ </field-validator>
+ </field>
+</validators>
diff --git
a/thoughts/lukaszlenart/notes/2025-10-17-struts2-iterator-validation-visitor-pattern.md
b/thoughts/lukaszlenart/notes/2025-10-17-struts2-iterator-validation-visitor-pattern.md
new file mode 100644
index 000000000..f8c23effb
--- /dev/null
+++
b/thoughts/lukaszlenart/notes/2025-10-17-struts2-iterator-validation-visitor-pattern.md
@@ -0,0 +1,363 @@
+---
+date: 2025-10-17T06:33:12+0000
+topic: "Struts 2: Validating Fields in Iterators/Collections"
+tags: [validation, iterator, visitor-validator, collections, conversion-errors]
+status: complete
+branch: main
+---
+
+# Research: Struts 2 Iterator Field Validation
+
+**Date**: 2025-10-17T06:33:12+0000
+
+## User Question
+
+User is migrating from Struts 1 to Struts 2 (actually Struts 7) and struggling
with validation syntax for fields within iterators:
+
+```jsp
+<s:iterator value="mother.child" status="status">
+ <s:textfield name="mother.child[%{#status.index}].name"/>
+ <s:textfield name="mother.child[%{#status.index}].pocketmoney" />
+</s:iterator>
+```
+
+**Issues encountered:**
+1. Tried XML field validators with `<field name="mother.child[].name">` - gets
errors for "mother.child[].name" (required even when all children have names)
+2. Conversion errors not repopulating fields with bad values despite `<param
name="repopulateField">true</param>`
+3. Missing equivalent to Struts 1's `indexedListProperty` approach
+4. Missing `@Repeatable` for `@DoubleRangeFieldValidator`
+5. Confusion about double validator locale formatting (German: 9.999,99 vs
Java float format)
+
+## Summary
+
+**Key Finding**: In Struts 2, you CANNOT directly validate indexed collection
properties with `<field name="collection[].property">`. Instead, you must use
the **VisitorFieldValidator pattern**, which delegates validation to the child
object's own validation file.
+
+This is fundamentally different from Struts 1's approach but provides better
separation of concerns and reusability.
+
+## Detailed Findings
+
+### The VisitorFieldValidator Pattern
+
+#### Core Implementation
+
+Found in
`core/src/main/java/org/apache/struts2/validator/validators/VisitorFieldValidator.java:158-166`:
+
+```java
+private void validateArrayElements(Object[] array, String fieldName, String
visitorContext) {
+ if (array == null) return;
+
+ for (int i = 0; i < array.length; i++) {
+ Object o = array[i];
+ if (o != null) {
+ validateObject(fieldName + "[" + i + "]", o, visitorContext);
+ }
+ }
+}
+```
+
+The validator automatically:
+1. Iterates through collections/arrays
+2. Appends index notation `[0]`, `[1]`, etc. to field names
+3. Validates each object using its own validation file
+4. Creates proper field error keys like `mother.child[0].name`,
`mother.child[1].pocketmoney`
+
+#### Supported Data Types
+
+From `VisitorFieldValidator.java:127-138`:
+- Simple Object properties
+- Collections of Objects (via `Collection` interface)
+- Arrays of Objects
+
+### Solution: Two-File Validation Pattern
+
+#### File 1: Action/Parent Validation (`YourAction-validation.xml`)
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
+ "https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="mother.child">
+ <field-validator type="visitor">
+ <param name="appendPrefix">true</param>
+ <message></message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+**Key Parameters**:
+- `appendPrefix` (default: true) - Prepends parent field name to child field
names
+- `context` (optional) - Specifies validation context for targeted validation
+
+#### File 2: Child Object Validation (`Child-validation.xml`)
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0//EN"
+ "https://struts.apache.org/dtds/xwork-validator-1.0.dtd";>
+<validators>
+ <field name="name">
+ <field-validator type="requiredstring">
+ <message>Child name is required</message>
+ </field-validator>
+ <field-validator type="stringlength">
+ <param name="minLength">2</param>
+ <param name="maxLength">50</param>
+ <message>Name must be between 2 and 50 characters</message>
+ </field-validator>
+ </field>
+
+ <field name="pocketmoney">
+ <field-validator type="required">
+ <message>Pocket money is required</message>
+ </field-validator>
+ <field-validator type="double">
+ <param name="minInclusive">0.00</param>
+ <param name="maxInclusive">999.99</param>
+ <message>Pocket money must be between 0.00 and 999.99</message>
+ </field-validator>
+ <field-validator type="conversion">
+ <param name="repopulateField">true</param>
+ <message>Invalid number format for pocket money</message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+### Working Examples from Codebase
+
+#### Example 1: TestBean List Validation
+
+**Action**:
`core/src/test/java/org/apache/struts2/validator/VisitorValidatorTestAction.java:37-50`
+```java
+private List<TestBean> testBeanList = new ArrayList<>();
+
+@StrutsParameter(depth = 3)
+public List<TestBean> getTestBeanList() {
+ return testBeanList;
+}
+```
+
+**Validation**:
`core/src/test/resources/org/apache/struts2/validator/VisitorValidatorTestAction-validateList-validation.xml`
+```xml
+<validators>
+ <field name="testBeanList">
+ <field-validator type="visitor">
+ <message>testBeanList: </message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+**Child Validation**:
`core/src/test/resources/org/apache/struts2/TestBean-validation.xml`
+```xml
+<validators>
+ <field name="name">
+ <field-validator type="requiredstring">
+ <message>You must enter a name.</message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+#### Example 2: Person Object with Visitor
+
+**Action**:
`apps/showcase/src/main/java/org/apache/struts2/showcase/person/NewPersonAction.java:37-44`
+```java
+private Person person;
+
+@StrutsParameter(depth = 1)
+public Person getPerson() {
+ return person;
+}
+```
+
+**Validation**:
`apps/showcase/src/main/resources/org/apache/struts2/showcase/person/NewPersonAction-validation.xml`
+```xml
+<validators>
+ <field name="person">
+ <field-validator type="visitor">
+ <message></message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+**Child Validation**:
`apps/showcase/src/main/resources/org/apache/struts2/showcase/person/Person-validation.xml`
+```xml
+<validators>
+ <field name="name">
+ <field-validator type="requiredstring">
+ <message>You must enter a first name.</message>
+ </field-validator>
+ </field>
+ <field name="lastName">
+ <field-validator type="requiredstring">
+ <message>You must enter a last name</message>
+ </field-validator>
+ </field>
+</validators>
+```
+
+## Code References
+
+-
`core/src/main/java/org/apache/struts2/validator/validators/VisitorFieldValidator.java:89-203`
- Main visitor validator implementation
+-
`core/src/main/java/org/apache/struts2/validator/validators/VisitorFieldValidator.java:158-166`
- Array iteration logic
+-
`core/src/main/java/org/apache/struts2/validator/validators/VisitorFieldValidator.java:168-184`
- Individual object validation with field name prefixing
+-
`core/src/main/java/org/apache/struts2/validator/validators/RepopulateConversionErrorFieldValidatorSupport.java:98-145`
- Conversion error repopulation implementation
+-
`core/src/main/java/org/apache/struts2/validator/validators/ConversionErrorFieldValidator.java:43-63`
- Conversion error detection
+
+## Additional Issues Addressed
+
+### 1. Conversion Error Repopulation
+
+**Implementation**:
`RepopulateConversionErrorFieldValidatorSupport.java:98-145`
+
+The `repopulateField` parameter should work, but there's complexity with
indexed properties:
+
+```java
+public void repopulateField(Object object) throws ValidationException {
+ Map<String, ConversionData> conversionErrors =
ActionContext.getContext().getConversionErrors();
+ String fieldName = getFieldName();
+ String fullFieldName = getValidatorContext().getFullFieldName(fieldName);
+
+ if (conversionErrors.containsKey(fullFieldName)) {
+ Object value = conversionErrors.get(fullFieldName).getValue();
+ // ... repopulation logic
+ }
+}
+```
+
+For indexed properties, the `fullFieldName` should be
`mother.child[0].pocketmoney`. The visitor validator's
`AppendingValidatorContext` (lines 186-222) handles this field name
construction.
+
+**Proper usage in child validation**:
+```xml
+<field name="pocketmoney">
+ <field-validator type="conversion">
+ <param name="repopulateField">true</param>
+ <message>Please enter a valid number</message>
+ </field-validator>
+</field>
+```
+
+### 2. Double Validator and Locale Formatting
+
+**Issue**: User confused about `minInclusive`/`maxInclusive` format vs
locale-specific input.
+
+**Clarification**:
+- **Type Conversion Layer**: Handles locale-specific formats (e.g., German
`9.999,99` → `9999.99`)
+- **Validation Layer**: Works with Java numeric values using `.` as decimal
separator
+- Parameters like `minInclusive="999.99"` use Java format, NOT locale format
+
+For German locale with input `9.999,99`:
+1. Type converter parses `9.999,99` → double value `9999.99`
+2. Validator checks: `0.00 <= 9999.99 <= 9999.99` ✓
+
+### 3. Decimal Place Validation
+
+The double validator does NOT enforce decimal places. For format-specific
validation:
+
+```xml
+<field name="pocketmoney">
+ <!-- First validate it's a number -->
+ <field-validator type="conversion">
+ <param name="repopulateField">true</param>
+ <message>Invalid number format</message>
+ </field-validator>
+
+ <!-- Then validate format (as string before conversion) -->
+ <field-validator type="regex">
+ <param name="regexExpression"><![CDATA[^\d+,\d{2}$]]></param>
+ <message>Please enter amount with exactly 2 decimal places (e.g.,
12,34)</message>
+ </field-validator>
+
+ <!-- Finally validate range -->
+ <field-validator type="double">
+ <param name="minInclusive">0.00</param>
+ <param name="maxInclusive">999.99</param>
+ <message>Amount must be between 0,00 and 999,99</message>
+ </field-validator>
+</field>
+```
+
+### 4. Missing @Repeatable for @DoubleRangeFieldValidator
+
+**Status**: Confirmed missing from codebase inspection.
+
+**Workaround**: Use XML validation instead of annotations for multiple range
checks on the same field, or use `@CustomValidator` with expression validation.
+
+**Recommendation**: File JIRA issue for enhancement.
+
+## Architecture Insights
+
+### Why Visitor Pattern vs Direct Field Validation?
+
+**Design Benefits**:
+1. **Separation of Concerns**: Child object owns its validation rules
+2. **Reusability**: Same Child validation works in different contexts
+3. **ModelDriven Pattern**: Aligns with Struts 2's ModelDriven approach
+4. **Type Safety**: Each object validates according to its class definition
+
+**Trade-off**: More verbose (requires separate validation file) but more
maintainable for complex object graphs.
+
+### Field Name Resolution
+
+The `AppendingValidatorContext` class (`VisitorFieldValidator.java:186-222`)
ensures proper field name construction:
+
+```java
+public String getFullFieldName(String fieldName) {
+ if (parent instanceof VisitorFieldValidator.AppendingValidatorContext) {
+ return parent.getFullFieldName(field + "." + fieldName);
+ }
+ return field + "." + fieldName;
+}
+```
+
+This recursive construction handles nested visitors (e.g.,
`grandmother.mother.child[0].name`).
+
+## Important Action Configuration
+
+Don't forget the `@StrutsParameter` annotation with proper depth:
+
+```java
+public class MotherAction extends ActionSupport {
+ private Mother mother;
+
+ @StrutsParameter(depth = 3) // Allows mother.child[0].name depth access
+ public Mother getMother() { return mother; }
+
+ public void setMother(Mother mother) { this.mother = mother; }
+}
+```
+
+The `depth` parameter controls how deep OGNL can traverse the object graph for
security reasons.
+
+## Comparison with Struts 1
+
+| Struts 1 | Struts 2 |
+|----------|----------|
+| `<field property="pocketmoney" indexedListProperty="child" depends="mask">`
| Two-file pattern: Parent uses visitor, Child defines field rules |
+| Single file validation | Distributed validation by object |
+| Index-aware validators | Visitor automatically handles indexing |
+
+**Philosophy Change**: Struts 1 focused on form-centric validation; Struts 2
focuses on object-centric validation.
+
+## Related Documentation
+
+- Apache Struts Visitor Validator:
https://struts.apache.org/core-developers/visitor-validator
+- VisitorFieldValidator API:
https://struts.apache.org/maven/struts2-core/apidocs/com/opensymphony/xwork2/validator/validators/VisitorFieldValidator.html
+
+## Open Questions
+
+1. **Repopulation Edge Case**: Does `repopulateField` work correctly for all
indexed property scenarios, or are there known limitations?
+2. **Performance**: What's the performance impact of visitor validation on
large collections (100+ elements)?
+3. **Custom Validators**: Can custom validators be easily integrated into the
visitor pattern?
+4. **Conditional Validation**: How to apply conditional validation (OGNL
expressions) within visited objects?
+
+## Recommendations
+
+1. **File JIRA**: Request `@Repeatable` support for
`@DoubleRangeFieldValidator`
+2. **Documentation**: Clarify in official docs that double validator params
use Java format, not locale format
+3. **Example**: Add showcase example demonstrating iterator validation with
conversion errors
+4. **Testing**: Test repopulation behavior specifically with indexed
properties to confirm it works as expected
\ No newline at end of file
