Merge pull request #1803 from cdapio/CDAP-20778-fix-javascript-transf…

…orm-java11

use the plugin classloader for loading scripting engin

core-plugins/src/main/java/io/cdap/plugin/transform/JavaScriptTransform.java

@@ -383,7 +383,7 @@ private Object decodeUnion(Object object, List<Schema> schemas) {
   }
 
   private void init(@Nullable TransformContext context, FailureCollector collector) {
-    ScriptEngineManager manager = new ScriptEngineManager();
+    ScriptEngineManager manager = new ScriptEngineManager(getClass().getClassLoader());
     engine = manager.getEngineByName("JavaScript");
     try {
       engine.eval(ScriptConstants.HELPER_DEFINITION);