[ 
https://issues.apache.org/jira/browse/MTOOLCHAINS-49?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17827606#comment-17827606
 ] 

ASF GitHub Bot commented on MTOOLCHAINS-49:
-------------------------------------------

slawekjaranowski commented on code in PR #14:
URL: 
https://github.com/apache/maven-toolchains-plugin/pull/14#discussion_r1526841943


##########
src/main/java/org/apache/maven/plugins/toolchain/jdk/ToolchainDiscoverer.java:
##########
@@ -0,0 +1,468 @@
+/*
+ * 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.maven.plugins.toolchain.jdk;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.apache.maven.toolchain.model.PersistedToolchains;
+import org.apache.maven.toolchain.model.ToolchainModel;
+import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Reader;
+import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Writer;
+import org.codehaus.plexus.util.xml.Xpp3Dom;
+import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static java.util.Comparator.comparing;
+import static 
org.apache.maven.plugins.toolchain.jdk.SelectJdkToolchainMojo.TOOLCHAIN_TYPE_JDK;
+
+/**
+ * Toolchain discoverer service
+ */
+@Named
+@Singleton
+public class ToolchainDiscoverer {
+
+    public static final String JAVA = "java.";
+    public static final String VERSION = "version";
+    public static final String RUNTIME_NAME = "runtime.name";
+    public static final String RUNTIME_VERSION = "runtime.version";
+    public static final String VENDOR = "vendor";
+    public static final String VENDOR_VERSION = "vendor.version";
+    public static final String[] PROPERTIES = {VERSION, RUNTIME_NAME, 
RUNTIME_VERSION, VENDOR, VENDOR_VERSION};
+
+    public static final String CURRENT = "current";
+    public static final String ENV = "env";
+    public static final String LTS = "lts";
+
+    public static final List<String> SORTED_PROVIDES = 
Collections.unmodifiableList(
+            Arrays.asList(VERSION, RUNTIME_NAME, RUNTIME_VERSION, VENDOR, 
VENDOR_VERSION, CURRENT, LTS, ENV));
+
+    public static final String DISCOVERED_TOOLCHAINS_CACHE_XML = 
".m2/discovered-toolchains-cache.xml";
+
+    public static final String JDK_HOME = "jdkHome";
+    public static final String JAVA_HOME = "java.home";
+
+    private static final String COMMA = ",";
+    public static final String USER_HOME = "user.home";
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private volatile Map<Path, ToolchainModel> cache;
+    private volatile boolean cacheModified;
+    private volatile Set<Path> foundJdks;
+
+    /**
+     * Build the model for the current JDK toolchain
+     */
+    public Optional<ToolchainModel> getCurrentJdkToolchain() {
+        Path currentJdkHome = 
getCanonicalPath(Paths.get(System.getProperty(JAVA_HOME)));
+        if (hasJavaC(currentJdkHome)) {
+            // in case the current JVM is not a JDK
+            return Optional.empty();
+        }
+        ToolchainModel model = new ToolchainModel();
+        model.setType(TOOLCHAIN_TYPE_JDK);
+        Stream.of(PROPERTIES).forEach(k -> {
+            String v = System.getProperty(JAVA + k);
+            if (v != null) {
+                model.addProvide(k.substring(JAVA.length()), v);

Review Comment:
   ```
   model.addProvide(k, v);
   ```



##########
src/main/java/org/apache/maven/plugins/toolchain/jdk/ToolchainDiscoverer.java:
##########
@@ -0,0 +1,468 @@
+/*
+ * 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.maven.plugins.toolchain.jdk;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import org.apache.maven.toolchain.model.PersistedToolchains;
+import org.apache.maven.toolchain.model.ToolchainModel;
+import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Reader;
+import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Writer;
+import org.codehaus.plexus.util.xml.Xpp3Dom;
+import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static java.util.Comparator.comparing;
+import static 
org.apache.maven.plugins.toolchain.jdk.SelectJdkToolchainMojo.TOOLCHAIN_TYPE_JDK;
+
+/**
+ * Toolchain discoverer service
+ */
+@Named
+@Singleton
+public class ToolchainDiscoverer {
+
+    public static final String JAVA = "java.";
+    public static final String VERSION = "version";
+    public static final String RUNTIME_NAME = "runtime.name";
+    public static final String RUNTIME_VERSION = "runtime.version";
+    public static final String VENDOR = "vendor";
+    public static final String VENDOR_VERSION = "vendor.version";
+    public static final String[] PROPERTIES = {VERSION, RUNTIME_NAME, 
RUNTIME_VERSION, VENDOR, VENDOR_VERSION};
+
+    public static final String CURRENT = "current";
+    public static final String ENV = "env";
+    public static final String LTS = "lts";
+
+    public static final List<String> SORTED_PROVIDES = 
Collections.unmodifiableList(
+            Arrays.asList(VERSION, RUNTIME_NAME, RUNTIME_VERSION, VENDOR, 
VENDOR_VERSION, CURRENT, LTS, ENV));
+
+    public static final String DISCOVERED_TOOLCHAINS_CACHE_XML = 
".m2/discovered-toolchains-cache.xml";
+
+    public static final String JDK_HOME = "jdkHome";
+    public static final String JAVA_HOME = "java.home";
+
+    private static final String COMMA = ",";
+    public static final String USER_HOME = "user.home";
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    private volatile Map<Path, ToolchainModel> cache;
+    private volatile boolean cacheModified;
+    private volatile Set<Path> foundJdks;
+
+    /**
+     * Build the model for the current JDK toolchain
+     */
+    public Optional<ToolchainModel> getCurrentJdkToolchain() {
+        Path currentJdkHome = 
getCanonicalPath(Paths.get(System.getProperty(JAVA_HOME)));
+        if (hasJavaC(currentJdkHome)) {

Review Comment:
   ```
   if (!hasJavaC(currentJdkHome))
   ```





> Automatic discovery of JDK toolchains
> -------------------------------------
>
>                 Key: MTOOLCHAINS-49
>                 URL: https://issues.apache.org/jira/browse/MTOOLCHAINS-49
>             Project: Maven Toolchains Plugin
>          Issue Type: Improvement
>            Reporter: Guillaume Nodet
>            Assignee: Guillaume Nodet
>            Priority: Major
>




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