REGRESSION: JVM crash with NPE exception when run apache Axis tcpmon utility

###@###.### 2004-01-09

J2SE Version (please include all output from java -version flag):
  java version "1.5.0-beta2"
  Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b32)
  Java HotSpot(TM) Client VM (build 1.5.0-beta2-b32, mixed mode)


Does this problem occur on J2SE 1.3, 1.4 or 1.4.1? Yes / No (pick one)
 No, it works fine with 1.4.2


Operating System Configuration Information (be specific):
 Windows 2000
 Solaris Sparc

Bug Description:
 When running the Apache Axis tcpmon utility (a Swing based utility),
 it throws an NullPointerException exception:

C:\>\j2sdk1.5.0\bin\java -classpath c:\axis-1_1rc2\axis-1_1RC2\lib\axis.jar
org.apache.axis.utils.tcpmon
java.lang.NullPointerException
        at org.apache.axis.utils.tcpmon$8.valueChanged(tcpmon.java:1426)
        at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:187)
        at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:167)
        at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSel
ectionModel.java:214)
        at
javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSele
ctionModel.java:408)
        at
javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSele
ctionModel.java:417)
        at
javax.swing.DefaultListSelectionModel.removeSelectionIntervalImpl(Def
aultListSelectionModel.java:510)
        at
javax.swing.DefaultListSelectionModel.removeSelectionInterval(Default
ListSelectionModel.java:482)
        at javax.swing.JTable.checkLeadAnchor(JTable.java:2963)
        at javax.swing.JTable.tableRowsInserted(JTable.java:3079)
        at javax.swing.JTable.tableChanged(JTable.java:3013)
        at
javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableMo
del.java:280)
        at
javax.swing.table.AbstractTableModel.fireTableRowsInserted(AbstractTa
bleModel.java:215)
        at
javax.swing.table.DefaultTableModel.insertRow(DefaultTableModel.java:
349)
        at
javax.swing.table.DefaultTableModel.addRow(DefaultTableModel.java:323
)
        at
javax.swing.table.DefaultTableModel.addRow(DefaultTableModel.java:334
)
        at org.apache.axis.utils.tcpmon$Listener.<init>(tcpmon.java:1474)
        at org.apache.axis.utils.tcpmon$5.actionPerformed(tcpmon.java:431)
        at
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:18
34)
        at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav
a:2152)
        at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:420)
        at
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258
)
        at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:234)
        at java.awt.Component.processMouseEvent(Component.java:5463)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3052)
        at java.awt.Component.processEvent(Component.java:5228)
        at java.awt.Container.processEvent(Container.java:1961)
        at java.awt.Component.dispatchEventImpl(Component.java:3931)
        at java.awt.Container.dispatchEventImpl(Container.java:2019)
        at java.awt.Component.dispatchEvent(Component.java:3779)
        at
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4203
)
        at
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3883)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3813)
        at java.awt.Container.dispatchEventImpl(Container.java:2005)
        at java.awt.Window.dispatchEventImpl(Window.java:1757)
        at java.awt.Component.dispatchEvent(Component.java:3779)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:234)
        at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
        at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

        at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)


Steps to Reproduce (be specific):

   1. Start tcpmon by entering the command-line:

      java -classpath axis.jar org.apache.axis.utils.tcpmon

  2. Enter in some values in the fields:
      
      Listen Port# -> 9999
      Target Hostname -> www.cnn.com
      Target Port# -> 80
     
    And click Add.

  3. NPE exception thrown