java.lang.NullPointerException

Oracle Community | 807596 | 1 decade ago
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  1. 0

    which listener should I use

    Oracle Community | 1 decade ago | 807596
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at gui_tutorial.MasterScreen.actionPerformed()
    2. gui_tutorial
      MasterScreen.actionPerformed
      1. gui_tutorial.MasterScreen.actionPerformed(MasterScreen.java:88)
      1 frame
    3. Java RT
      AbstractButton.fireActionPerformed
      1. javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764)
      1 frame