<Beans Dev> Fwd: Re: [PATCH] test/jdk/java/beans/PropertyEditor/Test6397609.java failed in JITed code

Fu Jie fujie at loongson.cn
Mon Jan 7 14:24:30 UTC 2019


A gc was added after "PropertyEditorManager.registerEditor(targetClass, 
editorClass);" based on Alan's patch.
Would you please review it and give me some advice? Thanks.
public class Test6397609 {
     public static void main(String[] args) throws Exception {
         Class<?> targetClass = Object.class;
         Class<?> editorClass = new MemoryClassLoader().compile("Editor",
                 "public class Editor extends 
java.beans.PropertyEditorSupport {}");
         PropertyEditorManager.registerEditor(targetClass, editorClass);

         // trigger a gc
         Object object = new Object();
         var r = new WeakReference<Object>(object);
         object = null;
         while (r.get() != null) {

         if (PropertyEditorManager.findEditor(targetClass) == null) {
             throw new Error("the editor is lost");

         // allow, and wait for, Editor class to be unloaded
         var ref = new WeakReference<Class<?>>(editorClass);
         editorClass = null;
         while (ref.get() != null) {

         if (PropertyEditorManager.findEditor(targetClass) != null) {
             throw new Error("unexpected editor is found");
For the full patch, please see the attachment.
I benefit a lot from the technical discussion with Alan and Sergey.
Thanks again.

Best regards,

On 2019年01月07日 20:02, Alan Bateman wrote:
> On 07/01/2019 01:26, Fu Jie wrote:
>> Hi,
>> Thanks Alan for your guidance. I like this patch and it seems very nice.
>> Do you think we need to trigger a GC after 
>> "PropertyEditorManager.registerEditor(targetClass, editorClass);"?
> Okay, probably add a sleep too so that there is some time for 
> reference processing (the original test didn't do this).
> Also in my patch I see I put the sleep before the GC, it should be the 
> other way around.
> -Alan.

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