Deadlocks in JConsole when pasting

Hello,

A deadlock occurs in the JConsole when pasting and then attempting to
execute scripts that exceed some relatively small length.  A thread
stack dump immediately shows the problem:

"AWT-EventQueue-0" prio=7 tid=0x00772250 nid=0x192 in Object.wait()
[18ecf000..18ecfd90]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x105eab30> (a java.io.PipedInputStream)
        at java.io.PipedInputStream.receive(PipedInputStream.java:149)
        - locked <0x105eab30> (a java.io.PipedInputStream)
        at java.io.PipedInputStream.receive(PipedInputStream.java:176)
        - locked <0x105eab30> (a java.io.PipedInputStream)
        at java.io.PipedOutputStream.write(PipedOutputStream.java:129)
        at java.io.OutputStream.write(OutputStream.java:58)
        at bsh.util.JConsole.acceptLine(Unknown Source)
        at bsh.util.JConsole.enter(Unknown Source)
        at bsh.util.JConsole.type(Unknown Source)
        - locked <0x105e75e8> (a bsh.util.JConsole)
        at bsh.util.JConsole.keyPressed(Unknown Source)
        at java.awt.Component.processKeyEvent(Component.java:5058)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2388)
        at java.awt.Component.processEvent(Component.java:4909)
        at java.awt.Container.processEvent(Container.java:1569)
        at java.awt.Component.dispatchEventImpl(Component.java:3615)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at
        java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713)
        at
        java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627)
        at
        java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
        at
        java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
        at
        java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
        at java.awt.Component.dispatchEventImpl(Component.java:3506)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Window.dispatchEventImpl(Window.java:1606)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
        at
        java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at
        java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at
        java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at
        java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at
        java.awt.EventDispatchThread.run(EventDispatchThread.java:100)


It shows that PipedInput and PipedOutput streams are deadlocked within
the EventQueue thread. As per the Java API, having a PipedInputReader
read from a PipedOutputWriter in the same thread is prone to causing
deadlocks, and does for me on a consistent basis.

Cheers,
Raman


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