SONAR-10286 Deprecate Plugin-ChildFirstClassLoader

sonar-core/src/main/java/org/sonar/core/platform/PluginLoader.java

@@ -37,8 +37,8 @@ import static java.util.Arrays.asList;
  * the entry point classes as defined in manifests. It assumes that JAR files are compatible with current
  * environment (minimal sonarqube version, compatibility between plugins, ...):
  * <ul>
- *   <li>server verifies compatibility of JARs before deploying them at startup (see ServerPluginRepository)</li>
- *   <li>batch loads only the plugins deployed on server (see BatchPluginRepository)</li>
+ * <li>server verifies compatibility of JARs before deploying them at startup (see ServerPluginRepository)</li>
+ * <li>batch loads only the plugins deployed on server (see BatchPluginRepository)</li>
  * </ul>
  * <p/>
  * Plugins have their own isolated classloader, inheriting only from API classes.
@@ -93,6 +93,9 @@ public class PluginLoader {
       // The plugins that extend other plugins can only add some files to classloader.
       // They can't change metadata like ordering strategy or compatibility mode.
       if (Strings.isNullOrEmpty(info.getBasePlugin())) {
+        if (info.isUseChildFirstClassLoader()) {
+          Loggers.get(getClass()).warn("Plugin {} [{}] uses a child first classloader which is deprecated", info.getName(), info.getKey());
+        }
         def.setSelfFirstStrategy(info.isUseChildFirstClassLoader());
         Version minSqVersion = info.getMinimalSqVersion();
         boolean compatibilityMode = minSqVersion != null && minSqVersion.compareToIgnoreQualifier(COMPATIBILITY_MODE_MAX_VERSION) < 0;

sonar-core/src/test/java/org/sonar/core/platform/PluginLoaderTest.java

@@ -21,6 +21,7 @@ package org.sonar.core.platform;
 
 import com.google.common.collect.ImmutableMap;
 import java.io.File;
+import java.io.IOException;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -109,6 +110,21 @@ public class PluginLoaderTest {
     // TODO test mask - require change in sonar-classloader
   }
 
+  @Test
+  public void log_warning_if_plugin_uses_child_first_classloader() throws IOException {
+    File jarFile = temp.newFile();
+    PluginInfo info = new PluginInfo("foo")
+      .setJarFile(jarFile)
+      .setUseChildFirstClassLoader(true)
+      .setMainClass("org.foo.FooPlugin");
+
+    Collection<PluginClassLoaderDef> defs = underTest.defineClassloaders(ImmutableMap.of("foo", info));
+    assertThat(defs).extracting(PluginClassLoaderDef::getBasePluginKey).containsExactly("foo");
+
+    List<String> warnings = logTester.logs(LoggerLevel.WARN);
+    assertThat(warnings).contains("Plugin foo [foo] uses a child first classloader which is deprecated");
+  }
+
   @Test
   public void log_warning_if_plugin_is_built_with_api_5_2_or_lower() throws Exception {
     File jarFile = temp.newFile();