Yunda, Thanks for the patch. I have created issue JDK-8009456 to track this and can sponsor the fix as soon as we get a Review of the fix.
/Staffan On 28 feb 2013, at 04:59, 云达(Yunda) <[email protected]> wrote: > Hi all, > > I found that when I detached a java process and attached another java > process, the “universe” command of CLHSDB didn’t show the right information. > But when I restarted CLHSDB and attached to the same process the problem > disappeared: > > hsdb> attach 29211 > Attaching to process 29211, please wait... > hsdb> universe > Heap Parameters: > ParallelScavengeHeap [ PSYoungGen [ eden = > [0x00000000ee200000,0x00000000ee289aa8,0x00000000eef70000] , from = > [0x00000000ef1a0000,0x00000000ef1a0000,0x00000000ef3d0000] , to = > [0x00000000eef70000,0x00000000eef70000,0x00000000ef1a0000] ] PSOldGen [ > [0x00000000ca600000,0x00000000ca600000,0x00000000cc9c0000] ] ] hsdb> > hsdb> detach > hsdb> attach 29887 > Attaching to process 29887, please wait... > hsdb> universe > Heap Parameters: > unknown subtype of CollectedHeap @ 0x0000000000d56fb0 > (0x00000000ca600000,0x0000000100000000) > hsdb> quit > [~]$ java -cp .:$JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.CLHSDB > hsdb> attach 29887 > Attaching to process 29887, please wait... > hsdb> universe > Heap Parameters: > ParallelScavengeHeap [ PSYoungGen [ eden = > [0x00000000ee200000,0x00000000ee289a68,0x00000000eef70000] , from = > [0x00000000ef1a0000,0x00000000ef1a0000,0x00000000ef3d0000] , to = > [0x00000000eef70000,0x00000000eef70000,0x00000000ef1a0000] ] PSOldGen [ > [0x00000000ca600000,0x00000000ca600000,0x00000000cc9c0000] ] ] hsdb> > > I think it’s caused by the wrong definition of “typeToVtbl” field of > BasicTypeDataBase. Since typeToVtbl should be recreated every time SA > attaches to a new process, it should not be static. So I made a small patch > fo fix it: > > diff -r ec2eddfed950 > agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java > --- > a/agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java > Tue Feb 26 14:09:52 2013 +0100 > +++ > b/agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicTypeDataBase.java > Thu Feb 28 11:57:55 2013 +0800 > @@ -150,7 +150,7 @@ > return VM.getVM().getOopSize(); > } > - static HashMap typeToVtbl = new HashMap(); > + private HashMap typeToVtbl = new HashMap(); > private Address vtblForType(Type type) { > Address vtblAddr = (Address)typeToVtbl.get(type); > > > After applying this patch, the problem I mentioned above disappeared. > > Regards, > Yunda > > > > This email (including any attachments) is confidential and may be legally > privileged. If you received this email in error, please delete it immediately > and do not copy it or use it for any purpose or disclose its contents to any > other person. Thank you. > > 本电邮(包括任何附件)可能含有机密资料并受法律保护。如您不是正确的收件人，请您立即删除本邮件。请不要将本电邮进行复制并用作任何其他用途、或透露本邮件之内容。谢谢。
