【已结贴】cognos产生大临时文件的问题

最近在c8/temp目录下经常产生uda开头的文件，有的有900 多M大，很快就把文件系统占满了，请问高手这写文件是什么文件啊，

另外在执行java -jar logconsole.jar界面后，在选择左边的菜单时，总是报
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at com.cognos.logcon.ui.swing.CRFrame.valueChanged(CRFrame.java:151)
        at javax.swing.JTree.fireValueChanged(JTree.java:2431)
        at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:2802)
        at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:659)
        at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1108)
        at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:317)
        at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:200)
        at javax.swing.JTree.setSelectionPath(JTree.java:1206)
        at javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2316)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelectionImpl(BasicTreeUI.java:3508)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3483)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3464)
        at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:254)
        at java.awt.Component.processMouseEvent(Component.java:5526)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3148)
        at java.awt.Component.processEvent(Component.java:5294)
        at java.awt.Container.processEvent(Container.java:2001)
        at java.awt.Component.dispatchEventImpl(Component.java:3996)
        at java.awt.Container.dispatchEventImpl(Container.java:2059)
        at java.awt.Component.dispatchEvent(Component.java:3844)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4249)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3926)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3859)
        at java.awt.Container.dispatchEventImpl(Container.java:2045)
        at java.awt.Window.dispatchEventImpl(Window.java:1810)
        at java.awt.Component.dispatchEvent(Component.java:3844)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:545)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:268)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:191)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:144)


这是什么问题呢，我用的是cognos8.1,unix版的，感觉问题很多