SONAR-3688 improve message

2 files changed, 71 insertions, 28 deletions

diff --git a/sonar-core/src/main/java/org/sonar/core/plugins/PluginClassloaders.java b/sonar-core/src/main/java/org/sonar/core/plugins/PluginClassloaders.java
index 2b2c27600be..f4c6c7e87f9 100644
--- a/sonar-core/src/main/java/org/sonar/core/plugins/PluginClassloaders.java
+++ b/sonar-core/src/main/java/org/sonar/core/plugins/PluginClassloaders.java
@@ -19,9 +19,11 @@
  */
 package org.sonar.core.plugins;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang.SystemUtils;
 import org.codehaus.plexus.classworlds.ClassWorld;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.codehaus.plexus.classworlds.realm.NoSuchRealmException;
@@ -60,12 +62,18 @@ public class PluginClassloaders {
   private static final String[] PREFIXES_TO_EXPORT = {"org.sonar.plugins.", "com.sonar.plugins.", "com.sonarsource.plugins."};
   private static final Logger LOG = LoggerFactory.getLogger(PluginClassloaders.class);
 
-  private ClassWorld world = new ClassWorld();
+  private ClassWorld world;
   private ClassLoader baseClassloader;
   private boolean done = false;
 
   public PluginClassloaders(ClassLoader baseClassloader) {
+    this(baseClassloader, new ClassWorld());
+  }
+
+  @VisibleForTesting
+  PluginClassloaders(ClassLoader baseClassloader, ClassWorld world) {
     this.baseClassloader = baseClassloader;
+    this.world = world;
   }
 
   public Map<String, Plugin> init(Collection<PluginMetadata> plugins) {
@@ -122,6 +130,9 @@ public class PluginClassloaders {
         realm.addURL(url);
       }
       return realm;
+    } catch (UnsupportedClassVersionError e) {
+      throw new SonarException("The plugin " + plugin.getKey() + " is not supported with Java " + SystemUtils.JAVA_VERSION_TRIMMED, e);
+
     } catch (Throwable e) {
       throw new SonarException("Fail to build the classloader of " + plugin.getKey(), e);
     }
@@ -143,8 +154,11 @@ public class PluginClassloaders {
         base.addURL(file.toURI().toURL());
       }
       return true;
+    } catch (UnsupportedClassVersionError e) {
+      throw new SonarException("The plugin " + plugin.getKey() + " is not supported with Java " + SystemUtils.JAVA_VERSION_TRIMMED, e);
+
     } catch (Throwable e) {
-      throw new SonarException("Fail to extend the plugin " + plugin.getBasePlugin() + " for " + plugin.getKey(), e);
+      throw new SonarException("Fail to extend the plugin " + plugin.getBasePlugin() + " with " + plugin.getKey(), e);
     }
   }
 
@@ -202,15 +216,16 @@ public class PluginClassloaders {
     }
   }
 
-  public Plugin instantiatePlugin(PluginMetadata metadata) {
+  public Plugin instantiatePlugin(PluginMetadata plugin) {
     try {
-      Class claz = get(metadata.getKey()).loadClass(metadata.getMainClass());
-      return (Plugin) claz.newInstance();
+      Class clazz = get(plugin.getKey()).loadClass(plugin.getMainClass());
+      return (Plugin) clazz.newInstance();
+
+    } catch (UnsupportedClassVersionError e) {
+      throw new SonarException("The plugin " + plugin.getKey() + " is not supported with Java " + SystemUtils.JAVA_VERSION_TRIMMED, e);
 
     } catch (Throwable e) {
-      // Do not catch only Exception in order to detect the plugins compiled for Java > 5
-      // (it raises a java.lang.UnsupportedClassVersionError)
-      throw new SonarException("Fail to load plugin " + metadata.getKey(), e);
+      throw new SonarException("Fail to load the plugin " + plugin.getKey(), e);
     }
   }
 
@@ -225,7 +240,7 @@ public class PluginClassloaders {
       } catch (Exception e) {
         // Ignore
       }
-      world=null;
+      world = null;
     }
   }
 }
diff --git a/sonar-core/src/test/java/org/sonar/core/plugins/PluginClassloadersTest.java b/sonar-core/src/test/java/org/sonar/core/plugins/PluginClassloadersTest.java
index e26e6e47428..451b0466592 100644
--- a/sonar-core/src/test/java/org/sonar/core/plugins/PluginClassloadersTest.java
+++ b/sonar-core/src/test/java/org/sonar/core/plugins/PluginClassloadersTest.java
@@ -20,26 +20,34 @@
 package org.sonar.core.plugins;
 
 import org.apache.commons.io.FileUtils;
+import org.codehaus.plexus.classworlds.ClassWorld;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.sonar.api.Plugin;
 import org.sonar.api.platform.PluginMetadata;
+import org.sonar.api.utils.SonarException;
 
 import java.io.File;
 import java.util.Arrays;
 import java.util.Map;
 
-import static org.hamcrest.Matchers.is;
-import static org.hamcrest.Matchers.notNullValue;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
+import static org.fest.assertions.Assertions.assertThat;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
 
 public class PluginClassloadersTest {
 
   private PluginClassloaders classloaders;
 
+  @Rule
+  public ExpectedException thrown = ExpectedException.none();
+
   @Before
   public void before() {
     classloaders = new PluginClassloaders(getClass().getClassLoader());
@@ -47,7 +55,9 @@ public class PluginClassloadersTest {
 
   @After
   public void clean() {
-    classloaders.clean();
+    if (classloaders != null) {
+      classloaders.clean();
+    }
   }
 
   @Test
@@ -57,23 +67,23 @@ public class PluginClassloadersTest {
     classloaders.done();
 
     String resourceName = "org/sonar/plugins/bar/api/resource.txt";
-    assertThat(classloaders.get("bar").getResourceAsStream(resourceName), notNullValue());
-    assertThat(classloaders.get("foo").getResourceAsStream(resourceName), notNullValue());
+    assertThat(classloaders.get("bar").getResourceAsStream(resourceName)).isNotNull();
+    assertThat(classloaders.get("foo").getResourceAsStream(resourceName)).isNotNull();
   }
 
   @Test
   public void shouldCreateBaseClassloader() {
     classloaders = new PluginClassloaders(getClass().getClassLoader());
     DefaultPluginMetadata checkstyle = DefaultPluginMetadata.create(null)
-        .setKey("checkstyle")
-        .setMainClass("org.sonar.plugins.checkstyle.CheckstylePlugin")
-        .addDeployedFile(getFile("sonar-checkstyle-plugin-2.8.jar"));
+      .setKey("checkstyle")
+      .setMainClass("org.sonar.plugins.checkstyle.CheckstylePlugin")
+      .addDeployedFile(getFile("sonar-checkstyle-plugin-2.8.jar"));
 
     Map<String, Plugin> map = classloaders.init(Arrays.<PluginMetadata>asList(checkstyle));
 
     Plugin checkstyleEntryPoint = map.get("checkstyle");
     ClassRealm checkstyleRealm = (ClassRealm) checkstyleEntryPoint.getClass().getClassLoader();
-    assertThat(checkstyleRealm.getId(), is("checkstyle"));
+    assertThat(checkstyleRealm.getId()).isEqualTo("checkstyle");
   }
 
   @Test
@@ -81,22 +91,40 @@ public class PluginClassloadersTest {
     classloaders = new PluginClassloaders(getClass().getClassLoader());
 
     DefaultPluginMetadata checkstyle = DefaultPluginMetadata.create(null)
-        .setKey("checkstyle")
-        .setMainClass("org.sonar.plugins.checkstyle.CheckstylePlugin")
-        .addDeployedFile(getFile("sonar-checkstyle-plugin-2.8.jar"));
+      .setKey("checkstyle")
+      .setMainClass("org.sonar.plugins.checkstyle.CheckstylePlugin")
+      .addDeployedFile(getFile("sonar-checkstyle-plugin-2.8.jar"));
 
     DefaultPluginMetadata checkstyleExt = DefaultPluginMetadata.create(null)
-        .setKey("checkstyle-ext")
-        .setBasePlugin("checkstyle")
-        .setMainClass("com.mycompany.sonar.checkstyle.CheckstyleExtensionsPlugin")
-        .addDeployedFile(getFile("sonar-checkstyle-extensions-plugin-0.1-SNAPSHOT.jar"));
+      .setKey("checkstyle-ext")
+      .setBasePlugin("checkstyle")
+      .setMainClass("com.mycompany.sonar.checkstyle.CheckstyleExtensionsPlugin")
+      .addDeployedFile(getFile("sonar-checkstyle-extensions-plugin-0.1-SNAPSHOT.jar"));
 
     Map<String, Plugin> map = classloaders.init(Arrays.<PluginMetadata>asList(checkstyle, checkstyleExt));
 
     Plugin checkstyleEntryPoint = map.get("checkstyle");
     Plugin checkstyleExtEntryPoint = map.get("checkstyle-ext");
 
-    assertEquals(checkstyleEntryPoint.getClass().getClassLoader(), checkstyleExtEntryPoint.getClass().getClassLoader());
+    assertThat(checkstyleEntryPoint.getClass().getClassLoader().equals(checkstyleExtEntryPoint.getClass().getClassLoader())).isTrue();
+  }
+
+  @Test
+  public void detect_plugins_compiled_for_bad_java_version() throws Exception {
+    thrown.expect(SonarException.class);
+    thrown.expectMessage("The plugin checkstyle is not supported with Java 1.");
+
+    ClassWorld world = mock(ClassWorld.class);
+    when(world.newRealm(anyString(), any(ClassLoader.class))).thenThrow(new UnsupportedClassVersionError());
+
+    classloaders = new PluginClassloaders(getClass().getClassLoader(), world);
+
+    DefaultPluginMetadata checkstyle = DefaultPluginMetadata.create(null)
+      .setKey("checkstyle")
+      .setMainClass("org.sonar.plugins.checkstyle.CheckstylePlugin")
+      .addDeployedFile(getFile("sonar-checkstyle-plugin-2.8.jar"));
+
+    classloaders.init(Arrays.<PluginMetadata>asList(checkstyle));
   }
 
   private File getFile(String filename) {