Name: egR10015 Date: 03/29/2001



HS1.3.1-rc1-b19 and HS1.4.0-beta-b57 fail to pass the following tests

nsk/jdi/EventRequestManager/accessWatchpointRequests/accwtchpreq001
nsk/jdi/EventRequestManager/breakpointRequests/breakpreq001
nsk/jdi/EventRequestManager/classPrepareRequests/clsprepreq001
nsk/jdi/EventRequestManager/classUnloadRequests/clsunlreq001

from testbase_nsk on all platforms. All these tests catch unexpected
VMDisconnectedException when they attempt to call method
com.sun.jdi.event.EventQueue.remove().

The JDI spec 1.3 on the method com.sun.jdi.event.EventQueue.remove() says:
---------------------------------------------------------------------------
"...
Throws:
...
VMDisconnectedException - if the connection to the target VM is no longer available.
         Note this will always be preceded by a VMDisconnectEvent."
---------------------------------------------------------------------------

According to the spec the tests always expect the VMDisconnectEvent which
is interpreted as a marker of stopping work with JDI's event queue. But
the VMDisconnectEvent intermittently missed (1 time in 10-12 executions).

The tests work as follows.
In a separate thread (the source file share/EventListener.java) the tests
asynchronously listens to JDI events in endless loop. In this loop the method
com.sun.jdi.event.EventQueue.remove() is being called. After obtaining
the VMDisconnectEvent the separate thread does not call the method
com.sun.jdi.event.EventQueue.remove() anymore and exits. But if
VMDisconnectedException was caught without preceded by the VMDisconnectEvent,
the thread throws an own RuntimeException (the file share/Failure.java) and
the test fails.
The test clsprepreq001 was put in GammaBase for the bug illustration.
This test consists of a debugger program (the file clsprepreq001.java)
and a debuggee program (the file clsprepreq001t.java). Note that the main goal
of the test is to exercise the method
com.sun.jdi.request.EventRequestManager.classPrepareRequests().
The VMDisconnectEvent appearance is only indirect testing.

To reproduce the bug run several times
doit.ksh <jdk home directory>
in
/net/sqesvr.eng/export/vsn/GammaBase/Bugs/<this bug number>

------------- output on Solsparc with HS1.4.0-beta-b57 -------------
$ ./doit.ksh /home/eug/hotspot/jdk1.4/solsparc
java version "1.4.0-internal"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-internal-b57)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b57, mixed mode)
Binder> Listening for a pipe connection to port: 7000
Binder> Binding to pipe socket
Binder> Listening to pipe server socket
Binder> VirtualMachineManager: version 1.4
Binder> LaunchingConnector:
Binder> name: com.sun.jdi.CommandLineLaunch
Binder> description: Launches target using Sun Java VM command line and attaches to it
Binder> transport: dt_socket
Binder> Connector arguments:
Binder> home=/export/ld54/java/dest/jdk1.4.0beta-b57/solsparc
Binder> vmexec=java
Binder> options= -classpath ".:share/classes:/home/eug/hotspot/jdk1.4/solsparc/lib/tools.jar"
Binder> main=clsprepreq001t "-verbose" "-waittime=2"
Binder> quote="
Binder> suspend=true
test.pipe> Waiting for pipe connection
debugee.err> debugee.pipe> Making pipe connection to socket: localhost:7000
Creating ClassPrepareRequest #0 with the property (first,a quick)...
Creating ClassPrepareRequest #1 with the property (second,brown)...
Creating ClassPrepareRequest #2 with the property (third,fox)...
Creating ClassPrepareRequest #3 with the property (fourth,jumps)...
Creating ClassPrepareRequest #4 with the property (fifth,over)...
Creating ClassPrepareRequest #5 with the property (sixth,the lazy)...
Creating ClassPrepareRequest #6 with the property (seventh,dog)...

1) Getting ClassPrepareRequest objects with disabled event requests...
Found expected ClassPrepare request with the property: (first,a quick)
Found expected ClassPrepare request with the property: (second,brown)
Found expected ClassPrepare request with the property: (third,fox)
Found expected ClassPrepare request with the property: (fourth,jumps)
Found expected ClassPrepare request with the property: (fifth,over)
Found expected ClassPrepare request with the property: (sixth,the lazy)
Found expected ClassPrepare request with the property: (seventh,dog)

2) Getting ClassPrepareRequest objects with enabled event requests...
Found expected ClassPrepare request with the property: (first,a quick)
Found expected ClassPrepare request with the property: (second,brown)
Found expected ClassPrepare request with the property: (third,fox)
Found expected ClassPrepare request with the property: (fourth,jumps)
Found expected ClassPrepare request with the property: (fifth,over)
Found expected ClassPrepare request with the property: (sixth,the lazy)
Found expected ClassPrepare request with the property: (seventh,dog)

Starting potential timed out section: waiting 2 minute(s) for debuggee's exit...
Potential timed out section passed

EventListener: caught VMDisconnectedException without preceded VMDisconnectEvent
com.sun.jdi.VMDisconnectedException: Socket closed
        at com.sun.tools.jdi.TargetVM.send(TargetVM.java:264)
        at com.sun.tools.jdi.VirtualMachineImpl.sendToTarget(VirtualMachineImpl.java:816)
        at com.sun.tools.jdi.PacketStream.send(PacketStream.java:44)
        at com.sun.tools.jdi.JDWP$ThreadReference$Name.enqueueCommand(JDWP.java:3763)
        at com.sun.tools.jdi.JDWP$ThreadReference$Name.process(JDWP.java:3749)
        at com.sun.tools.jdi.ThreadReferenceImpl.name(ThreadReferenceImpl.java:79)
        at com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.toString(EventSetImpl.java:123)
        at clsprepreq001.handleEvent(clsprepreq001.java:191)
        at nsk.jdi.share.EventListener$EventHandlerQueue.dispatchEvent(EventListener.java:271)
        at nsk.jdi.share.EventListener.run(EventListener.java:189)

nsk.jdi.share.Failure: com.sun.jdi.VMDisconnectedException: Socket closed
        at nsk.jdi.share.EventListener.run(EventListener.java:205)
# ERROR: TEST FAILED
test.pipe> Closing pipe socket
Binder> Closing pipe server socket
exit code = 97
--------------------------------------------------------------------

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