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From: Jan Burse <janburse@fastmail.fm>
Newsgroups: comp.lang.java.programmer
Subject: Thumbs up for suppressable exceptions in JDK 1.7
Date: Tue, 27 Sep 2011 09:31:03 +0200
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Dear All

Was just playing around with suppressable exceptions
in JDK 1.7. This looks like a great improvement for
bug hunting!

Best Regards

Manually Suppressed:
------------------

   public class TestSuppressed {

     public static void main(String[] args) throws Exception {
         try {
             throw new IllegalArgumentException("x");
         } catch (IllegalArgumentException x) {
             x.addSuppressed(new IllegalArgumentException("y"));
             throw x;
         }
     }

   }

gives:

    Exception in thread "main" java.lang.IllegalArgumentException: x
     at TestSuppressed.main(TestSuppressed.java:12)
     Suppressed: java.lang.IllegalArgumentException: y
         at TestSuppressed.main(TestSuppressed.java:14)
         ... 5 more

Automatically Suppressed:
---------------------

    public class TestSuppressed implements AutoCloseable {

       public static void main(String[] args) throws Exception {
         try (TestSuppressed ts=new TestSuppressed()) {
             throw new IllegalArgumentException("x");
         }
       }

       public void close() throws Exception {
         throw new IllegalArgumentException("y");
       }

    }

gives:

    Exception in thread "main" java.lang.IllegalArgumentException: x
     at TestSuppressed.main(TestSuppressed.java:9)
     Suppressed: java.lang.IllegalArgumentException: y
         at TestSuppressed.close(TestSuppressed.java:20)
         at TestSuppressed.main(TestSuppressed.java:10)
         ... 5 more