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  1. JDK
  2. JDK-6521141

DebugGraphics NPE @ setFont();

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    • b11
    • x86
    • linux

    Description

      FULL PRODUCT VERSION :
      chuck@moth:~> java -version
      java version "1.6.0_01-ea"
      Java(TM) SE Runtime Environment (build 1.6.0_01-ea-b03)
      Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_01-ea-b03, mixed mode)
      chuck@moth:~>

      ADDITIONAL OS VERSION INFORMATION :
      Linux moth 2.6.13-15.13-default #1 Tue Nov 28 13:43:50 UTC 2006 x86_64 x86_64 x86_64 GNU/Linux

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      SUSE 10.2 (boxed) on AMD 64

      A DESCRIPTION OF THE PROBLEM :
      Following class throws NPE -- should not.

      package experimental;

      import java.awt.Font;
      import javax.swing.DebugGraphics;

      public class DebugGraphicsNullPointer {

      private DebugGraphics dgraph;
      private Font font;


      public DebugGraphicsNullPointer() {
      }


      public static void main(String[] args) {
      DebugGraphicsNullPointer pointer = new DebugGraphicsNullPointer();
      pointer.runTest();

      }

      private void runTest() {
      dgraph = new DebugGraphics();
      font = new Font("Currier", Font.PLAIN, 10);
      if(font == null) {
      System.out.println("The font object is null"); // does not execute
      }
      dgraph.setFont(font); // this line throws NPE @ DebugGraphics line 185
      }

      }

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      run the class

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      should run clean or output the text
      ACTUAL -
      throws NPE

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Compiling 1 source file to /programs/Infosys/client/build/classes
      compile-single:
      run-single:
      Exception in thread "main" java.lang.NullPointerException
              at javax.swing.DebugGraphics.setFont(DebugGraphics.java:185)
              at experimental.DebugGraphicsNullPointer.runTest(DebugGraphicsNullPointer.java:43)
              at experimental.DebugGraphicsNullPointer.main(DebugGraphicsNullPointer.java:33)
      Java Result: 1
      BUILD SUCCESSFUL (total time: 10 seconds)

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      package experimental;

      import java.awt.Font;
      import javax.swing.DebugGraphics;

      /**
       *
       * @author chuck
       */
      public class DebugGraphicsNullPointer {

      private DebugGraphics dgraph;
      private Font font;

      /** Creates a new instance of DebugGraphicsNullPointer */
      public DebugGraphicsNullPointer() {
      }

      /**
      * @param args the command line arguments
      */
      public static void main(String[] args) {
      DebugGraphicsNullPointer pointer = new DebugGraphicsNullPointer();
      pointer.runTest();

      }

      private void runTest() {
      dgraph = new DebugGraphics();
      font = new Font("Currier", Font.PLAIN, 10);
      if(font == null) {
      System.out.println("The font object is null");
      }
      dgraph.setFont(font);
      }

      }
      ---------- END SOURCE ----------

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              tr Tejesh R
              ndcosta Nelson Dcosta (Inactive)
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                Created:
                Updated:
                Resolved:
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