Fixes to CaughtException and AnalysisException

editor/util/plugins/com.google.dart.java2dart/resources/java_engine.dart

 library java.engine;
 
 import 'java_core.dart';
 
 /**
  * A predicate is a one-argument function that returns a boolean value.
  */
 typedef bool Predicate<E>(E argument);
 
 class StringUtilities {
@@ skipping 237 matching lines @@
    * The exception that caused this exception, or `null` if this exception was
    * not caused by another exception.
    */
   final CaughtException cause;
 
   /**
    * Initialize a newly created exception to have the given [message] and
    * [cause].
    */
   AnalysisException([this.message = 'Exception', this.cause = null]);
+
+  String toString() {
+    StringBuffer buffer = new StringBuffer();
+    buffer.write("AnalysisException: ");
+    buffer.writeln(message);
+    if (cause != null) {
+      buffer.write('Caused by ');
+      cause._writeOn(buffer);
+    }
+    return buffer.toString();
+  }
 }
 
 
 /**
  * Instances of the class `CaughtException` represent an exception that was
  * caught and has an associated stack trace.
  */
 class CaughtException implements Exception {
   /**
    * The exception that was caught.
    */
-  final Exception exception;
+  final Object exception;
 
   /**
    * The stack trace associated with the exception.
    */
   StackTrace stackTrace;
 
   /**
    * Initialize a newly created caught exception to have the given [exception]
    * and [stackTrace].
    */
@@ skipping 30 matching lines @@
       if (cause != null) {
         buffer.write('Caused by ');
         cause._writeOn(buffer);
       }
     } else {
       buffer.writeln(exception.toString());
       buffer.writeln(stackTrace.toString());
     }
   }
 }