java.lang.NullPointerException

Coderanch | Jim Yingst | 2 decades ago
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    FocusListener Null Pointer Exception

    Coderanch | 2 decades ago | Jim Yingst
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at PageContainingJTextField.addFocusListener()
    2. Unknown
      PageContainingJTextField.addFocusListener
      1. PageContainingJTextField.addFocusListener(Test.java:14)
      1 frame
    3. Java RT
      JPanel.<init>
      1. javax.swing.JComponent.enableSerialization(JComponent.java:3861)
      2. javax.swing.JComponent.<init>(JComponent.java:200)
      3. javax.swing.JPanel.<init>(JPanel.java:66)
      4. javax.swing.JPanel.<init>(JPanel.java:100)
      4 frames
    4. Unknown
      Test.main
      1. PageContainingJTextField.<init>(Test.java:7)
      2. FocusPeeker.<init>(Test.java:20)
      3. Test.main(Test.java:38)
      3 frames