java.lang.NullPointerException

Stack Overflow | Luke Moll | 2 months ago
  1. 0

    NPE when calling new JPanel() in headless (RepaintManager.currentManager)

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    java.lang.NullPointerException
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    Stack Overflow | 11 months ago | Junie Negentien
    java.lang.RuntimeException: Unable to resume activity {com.ourThesis.junieNegentien2015/com.ourThesis.junieNegentien2015.MainActivity}: java.lang.NullPointerException

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    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at javax.swing.RepaintManager.currentManager()
    2. Java RT
      JPanel.<init>
      1. javax.swing.RepaintManager.currentManager(RepaintManager.java:262)
      2. javax.swing.JComponent.repaint(JComponent.java:4799)
      3. java.awt.Component.repaint(Component.java:3303)
      4. javax.swing.JComponent.setFont(JComponent.java:2756)
      5. javax.swing.LookAndFeel.installColorsAndFont(LookAndFeel.java:208)
      6. javax.swing.plaf.basic.BasicPanelUI.installDefaults(BasicPanelUI.java:66)
      7. javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:56)
      8. javax.swing.JComponent.setUI(JComponent.java:664)
      9. javax.swing.JPanel.setUI(JPanel.java:153)
      10. javax.swing.JPanel.updateUI(JPanel.java:126)
      11. javax.swing.JPanel.<init>(JPanel.java:86)
      12. javax.swing.JPanel.<init>(JPanel.java:109)
      13. javax.swing.JPanel.<init>(JPanel.java:117)
      13 frames
    3. lukemoll
      MyClass.<init>
      1. lukemoll.MyClass.<init>(MyClass.java:15)
      1 frame