documentAnalyzer throws NPE
---------------------------

                 Key: UIMA-898
                 URL: https://issues.apache.org/jira/browse/UIMA-898
             Project: UIMA
          Issue Type: Bug
          Components: Tools
    Affects Versions: 2.2.1
            Reporter: Michael Baessler
             Fix For: 2.2.2


documentAnalyzer throws NPE when clicking von "view" button with an empty 
output directory

java.lang.NullPointerException
        at javax.swing.JList$1.getSize(JList.java:315)
        at javax.swing.JList.getPreferredScrollableViewportSize(JList.java:1914)
        at 
javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:75)
        at java.awt.Container.preferredSize(Container.java:1558)
        at java.awt.Container.getPreferredSize(Container.java:1543)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
        at 
javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:475)
        at java.awt.Container.preferredSize(Container.java:1558)
        at java.awt.Container.getPreferredSize(Container.java:1543)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
        at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
        at java.awt.Container.preferredSize(Container.java:1558)
        at java.awt.Container.getPreferredSize(Container.java:1543)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
        at 
javax.swing.JRootPane$RootLayout.preferredLayoutSize(JRootPane.java:824)
        at java.awt.Container.preferredSize(Container.java:1558)
        at java.awt.Container.getPreferredSize(Container.java:1543)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
        at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
        at java.awt.Container.preferredSize(Container.java:1558)
        at java.awt.Container.getPreferredSize(Container.java:1543)
        at java.awt.Window.pack(Window.java:487)
        at 
org.apache.uima.tools.docanalyzer.DocumentAnalyzer.show_analysis(DocumentAnalyzer.java:828)
        at 
org.apache.uima.tools.docanalyzer.DocumentAnalyzer.showAnalysisResults(DocumentAnalyzer.java:765)
        at 
org.apache.uima.tools.docanalyzer.DocumentAnalyzer.actionPerformed(DocumentAnalyzer.java:497)
        at 
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
        at 
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
        at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at 
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at 
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:5517)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
        at java.awt.Component.processEvent(Component.java:5282)
        at java.awt.Container.processEvent(Container.java:1966)
        at java.awt.Component.dispatchEventImpl(Component.java:3984)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3819)
        at 
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
        at java.awt.Container.dispatchEventImpl(Container.java:2010)
        at java.awt.Window.dispatchEventImpl(Window.java:1791)
        at java.awt.Component.dispatchEvent(Component.java:3819)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.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)

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