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  1. JDK
  2. JDK-8036942

javac generates incorrect exception table for multi-catch statements inside a lambda

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    • Subcomponent:
    • Resolved In Build:
      b15
    • Verification:
      Verified

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        Description

        If this code is compiled:

        import java.io.IOException;

        public class FunWithMultiCatch {
          public static void main(String[] args) {
            Runnable r = () -> {
              try {
                Object o = null;
                o.getClass();
                throw new IOException();
              } catch(IOException | IllegalArgumentException e) {
                System.out.println("KO !");
              } catch(RuntimeException e) {
                System.out.println("OK !");
              }
            };
            r.run();
          }
        }

        javac generates this code:

        private static void lambda$main$0();
            descriptor: ()V
            flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
            Code:
              stack=2, locals=1, args_size=0
                 0: aconst_null
                 1: astore_0
                 2: aload_0
                 3: invokevirtual #4 // Method java/lang/Object.getClass:()Ljava/lang/Class;
                 6: pop
                 7: new #5 // class java/io/IOException
                10: dup
                11: invokespecial #6 // Method java/io/IOException."<init>":()V
                14: athrow
                15: astore_0
                16: getstatic #8 // Field java/lang/System.out:Ljava/io/PrintStream;
                19: ldc #9 // String KO !
                21: invokevirtual #10 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
                24: goto 36
                27: astore_0
                28: getstatic #8 // Field java/lang/System.out:Ljava/io/PrintStream;
                31: ldc #12 // String OK !
                33: invokevirtual #10 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
                36: return
              Exception table:
                 from to target type
                     0 15 15 Class java/lang/Exception <----- this will capture all exceptions.
                     0 15 27 Class java/lang/RuntimeException

        if the original code is modified to:

        import java.io.IOException;

        class FunWithMultiCatch {
          public static void main(String[] args) {
              try {
                Object o = null;
                o.getClass();
                throw new IOException();
              } catch(IOException | IllegalArgumentException e) {
                System.out.println("KO !");
              } catch(RuntimeException e) {
                System.out.println("OK !");
              }
          }
        }

        then we obtain this exception table:

            Exception table:
                 from to target type
                     0 15 15 Class java/io/IOException
                     0 15 15 Class java/lang/IllegalArgumentException
                     0 15 27 Class java/lang/RuntimeException

        reported in lambda-dev: http://mail.openjdk.java.net/pipermail/lambda-dev/2014-March/011940.html

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                • Assignee:
                  rfield Robert Field
                  Reporter:
                  vromero Vicente Arturo Romero Zaldivar
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                    Updated:
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