On Tue, 6 Apr 2021 01:42:45 GMT, Chris Plummer <cjplum...@openjdk.org> wrote:
>> They are needed.
>>
>> If we don't give `execPolicy=none`, we can see warning on console.
>> SA code would run on rmid, so we need to add module.
>
> I was actually just referring to `--add-modules`, but github added a few
> lines before the one I selected.
>
> I guess I'm not fully understanding what `rmid` is for in this context, and
> how it relates to the `rmiregistry` command. I thought it was starting the
> registry, but that does not seem to be it's primary purpose (maybe it starts
> it as a side affect). Also, it is deprecated.
SA has RMI remote object, it will be handled in RMI registry.
We can see following exception without `--add-modules`.
$ jhsdb debugd --pid 40339 --disableregistry --hostname localhost
--registryport 1098
Attaching to process ID 40339 and starting RMI services, please wait...
Error attaching to process or starting server:
sun.jvm.hotspot.debugger.DebuggerException: java.rmi.ServerException:
RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException:
sun.jvm.hotspot.debugger.remote.RemoteDebugger
at jdk.hotspot.agent/sun.jvm.hotspot.RMIHelper.rebind(RMIHelper.java:75)
at
jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:380)
at
jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:330)
at
jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.startServer(HotSpotAgent.java:216)
at
jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runDEBUGD(SALauncher.java:437)
at
jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:499)
Caused by: java.rmi.ServerException: RemoteException occurred in server thread;
nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException:
sun.jvm.hotspot.debugger.remote.RemoteDebugger
at
java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:389)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:831)
at
java.rmi/sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:303)
at
java.rmi/sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:279)
at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:380)
at
java.rmi/sun.rmi.registry.RegistryImpl_Stub.rebind(RegistryImpl_Stub.java:158)
at java.rmi/java.rmi.Naming.rebind(Naming.java:177)
at jdk.hotspot.agent/sun.jvm.hotspot.RMIHelper.rebind(RMIHelper.java:64)
... 5 more
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException:
sun.jvm.hotspot.debugger.remote.RemoteDebugger
at
java.rmi/sun.rmi.registry.RegistryImpl_Skel.dispatch(RegistryImpl_Skel.java:157)
at
java.rmi/sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:466)
at
java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:296)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at
java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.ClassNotFoundException:
sun.jvm.hotspot.debugger.remote.RemoteDebugger
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:432)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
at
java.rmi/sun.rmi.server.LoaderHandler$Loader.loadClass(LoaderHandler.java:1207)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:466)
at
java.rmi/sun.rmi.server.LoaderHandler.loadClassForName(LoaderHandler.java:1221)
at
java.rmi/sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:731)
at
java.rmi/sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:674)
at
java.rmi/sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:611)
at
java.rmi/java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:646)
at
java.rmi/java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:311)
at
java.rmi/sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:254)
at
java.base/java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1944)
at
java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1886)
at
java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2196)
at
java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1706)
at
java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:496)
at
java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:454)
at
java.rmi/sun.rmi.registry.RegistryImpl_Skel.dispatch(RegistryImpl_Skel.java:154)
... 14 more
As an option, we can also use RMI registry which is started by debugd as
following:
* console 1
* `jhsdb debugd --disableregistry --pid 40859`
* console 2
* `jhsdb -J-Dsun.jvm.hotspot.rmi.serverNamePrefix=second debugd
--disableregistry --pid 40860`
-------------
PR: https://git.openjdk.java.net/jdk/pull/3233
