FULL PRODUCT VERSION :
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) Client VM (build 24.71-b01, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601], and 6.2, other

A DESCRIPTION OF THE PROBLEM :
Tag that specifies the applet cache as follows There are several in the system.

<OBJECT ....
<PARAM NAME = "cache_archive" VALUE = "a.jar, b.jar"
<PARAM NAME = "cache_version" VALUE = "0.0.1.0, 0.0.2.0"
<PARAM NAME = "cache_option" VALUE = "Plugin"
<PARAM NAME = "codebase" VALUE = "/ download"
</ OBJECT>

Although there is no problem when it is operating in the cache,
When applet update (ex. 0.0.1.0, 0.0.2.0 -> 0.0.1.1, 0.0.2.1) only, exception occurs.

I think that the designated method (including codebase) of the tag does not have the error,
is this phenomenon a disorder of JAVA (jre,applet)?



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Initial screen (A) : First cache description.
Another screen (B) : Second cache description.

1) the initial screen (A) : No problem.
2) With the initial screen (A) is opened, open another screen (B) : No problem.
3) I close another screen (B) : Excepton occurs. Initial screen (A) is freeze.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
New applet is cached, and the program is executed. (Exeption does not occur).
ACTUAL -
Excepton occurs. Initial screen (A) is freeze

I attach an example of the exception displayed by java console.
---
case1
Exception in thread "AWT-EventQueue-4" java.lang.IllegalThreadStateException: forbid thread creation in disposed TG
at sun.plugin.security.ActivatorSecurityManager.checkAccess(Unknown Source)
at java.lang.ThreadGroup.checkAccess(Unknown Source)
at java.lang.Thread.init(Unknown Source)
at java.lang.Thread.<init>(Unknown Source)
at java.awt.EventDispatchThread.<init>(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.EventQueue.initDispatchThread(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

case2
Exception in thread "AWT-EventQueue-4" java.util.NoSuchElementException
at java.util.LinkedList.getFirst(Unknown Source)
at java.awt.SequencedEvent.getFirst(Unknown Source)
at java.awt.SequencedEvent.getFirstWithContext(Unknown Source)
at java.awt.SequencedEvent.isFirstOrDisposed(Unknown Source)
at java.awt.SequencedEvent$1.evaluate(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.SequencedEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

case3
Exception in thread "AWT-EventQueue-4" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(Unknown Source)
at java.util.concurrent.locks.ReentrantLock.unlock(Unknown Source)
at java.awt.EventQueue.getNextEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)


REPRODUCIBILITY :
This bug can be reproduced always.