[MSHADE-298] Groovy extension module transformer looking in incorrect META-INF directory

Author: rfscholte

src/main/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformer.java

@@ -39,7 +39,10 @@ public class GroovyResourceTransformer
     implements ResourceTransformer
 {
 
-    static final String EXT_MODULE_NAME = "META-INF/services/org.codehaus.groovy.runtime.ExtensionModule";
+    static final String EXT_MODULE_NAME_LEGACY = "META-INF/services/org.codehaus.groovy.runtime.ExtensionModule";
+
+    // Since Groovy 2.5.x/Java 9 META-INF/services may only be used by Service Providers
+    static final String EXT_MODULE_NAME = "META-INF/groovy/org.codehaus.groovy.runtime.ExtensionModule";
 
     private List<String> extensionClassesList = new ArrayList<>();
 
@@ -52,21 +55,17 @@ public class GroovyResourceTransformer
     @Override
     public boolean canTransformResource( String resource )
     {
-        return EXT_MODULE_NAME.equals( resource );
+        return EXT_MODULE_NAME.equals( resource ) || EXT_MODULE_NAME_LEGACY.equals( resource );
     }
 
     @Override
     public void processResource( String resource, InputStream is, List<Relocator> relocators )
         throws IOException
     {
         Properties out = new Properties();
-        try
-        {
-            out.load( is );
-        }
-        finally
+        try ( InputStream props = is )
         {
-            is.close();
+            out.load( props );
         }
         String extensionClasses = out.getProperty( "extensionClasses", "" ).trim();
         if ( extensionClasses.length() > 0 )

src/test/java/org/apache/maven/plugins/shade/resource/GroovyResourceTransformerTest.java

@@ -73,13 +73,15 @@ private static Properties transform( GroovyResourceTransformer transformer )
     {
         File tempJar = File.createTempFile( "shade.", ".jar" );
         tempJar.deleteOnExit();
-        FileOutputStream fos = new FileOutputStream( tempJar );
-        JarOutputStream jaos = new JarOutputStream( fos );
-        transformer.modifyOutputStream( jaos );
-        jaos.close();
+
+        try ( FileOutputStream fos = new FileOutputStream( tempJar );
+              JarOutputStream jaos = new JarOutputStream( fos ) )
+        {
+            transformer.modifyOutputStream( jaos );
+        }
+        
         Properties desc = null;
-        JarFile jar = new JarFile( tempJar );
-        try
+        try ( JarFile jar = new JarFile( tempJar ) )
         {
             ZipEntry entry = jar.getEntry( GroovyResourceTransformer.EXT_MODULE_NAME );
             if ( entry != null )
@@ -88,10 +90,6 @@ private static Properties transform( GroovyResourceTransformer transformer )
                 desc.load( jar.getInputStream( entry ) );
             }
         }
-        finally
-        {
-            jar.close();
-        }
         return desc;
     }
 
@@ -100,6 +98,7 @@ public void testFilter()
     {
         GroovyResourceTransformer transformer = new GroovyResourceTransformer();
         assertTrue( transformer.canTransformResource( GroovyResourceTransformer.EXT_MODULE_NAME ) );
+        assertTrue( transformer.canTransformResource( GroovyResourceTransformer.EXT_MODULE_NAME_LEGACY ) );
         assertFalse( transformer.canTransformResource( "somethingElse" ) );
         assertFalse( transformer.canTransformResource( JarFile.MANIFEST_NAME ) );
     }