diff -r 787578f33c21 -r 00ae3f46e54f rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Wed Apr 10 10:08:18 2013 +0200
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Apr 26 13:35:21 2013 +0200
@@ -1787,20 +1787,11 @@
             if (e.catch_cpx != 0) { //not finally
                 final String classInternalName = jc.getClassName(e.catch_cpx);
                 addReference(classInternalName);
-                if ("java/lang/Throwable".equals(classInternalName)) {
-                    out.append("if (e.$instOf_java_lang_Throwable) {");
-                    out.append("  var stA0 = e;");
-                    out.append("} else {");
-                    out.append("  var stA0 = vm.java_lang_Throwable(true);");
-                    out.append("  vm.java_lang_Throwable.cons__VLjava_lang_String_2.call(stA0, e.toString());");
-                    out.append("}");
-                    goTo(out, current, e.handler_pc, topMostLabel);
-                } else {
-                    out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");
-                    out.append("var stA0 = e;");
-                    goTo(out, current, e.handler_pc, topMostLabel);
-                    out.append("}\n");
-                }
+                out.append("e = vm.java_lang_Throwable(false).bck2BrwsrCnvrt(e);");
+                out.append("if (e.$instOf_" + classInternalName.replace('/', '_') + ") {");
+                out.append("var stA0 = e;");
+                goTo(out, current, e.handler_pc, topMostLabel);
+                out.append("}\n");
             } else {
                 finallyPC = e.handler_pc;
             }