Java Connectivity Builder problem

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Disclaimer: I'm new with less than 3 months SAP experience.

I'm trying to run the Java Connectivity Builder and it keeps bombing with the same error:

#18 11:39:35 AM [AWT-EventQueue-0] DEBUG com.sap.aii.ifr.upload.UploadBuffer: ne

w UploadBuffer

java.lang.ClassCastException

at javax.swing.AbstractButton.configurePropertiesFromAction(Unknown Sour

ce)

at javax.swing.JButton.configurePropertiesFromAction(Unknown Source)

at javax.swing.AbstractButton.setAction(Unknown Source)

at com.sap.aii.ifr.navigation.ToolButton.setAction(ToolButton.java:89)

at com.sap.aii.ifr.navigation.ToolButton.<init>(ToolButton.java:84)

at com.sap.aii.ifr.navigation.NavigationToolBar.<init>(NavigationToolBar

.java:33)

at com.sap.aii.ifr.navigation.NavigationToolBar.<init>(NavigationToolBar

.java:37)

at com.sap.aii.ifr.upload.client.SAPNavigationPane.<init>(SAPNavigationP

ane.java:54)

at com.sap.aii.ifr.upload.client.SAPBrowser.setIsConnected(SAPBrowser.ja

va:252)

at com.sap.aii.ifr.upload.client.SAPBrowser$ConnectAction.actionPerforme

d(SAPBrowser.java:594)

at com.sap.aii.ifr.upload.client.SAPBrowser$NextAction.actionPerformed(S

APBrowser.java:536)

at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow

n Source)

at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Sour

ce)

at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)

at java.awt.Component.processMouseEvent(Unknown Source)

at java.awt.Component.processEvent(Unknown Source)

at java.awt.Container.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

Does anyone have any clue as to how to fix this issue?

I think I'm running R/3 and SAPJ2ee Engine 6.20 Patch 30 on my local host. My boss can get his to work and our app otherwise runs on my localhost, so I'm eliminating a SAP server issue and a J2ee engine issue. Any other ideas?