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HeapAnalyzer
A graphical tool for discovering possible Java heap leaks.
Date Posted: November 4, 2004
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The following is an example of processing a Java™ heap dump of about 1 GB:
<Java Runtime Environment path>java -Xmx1200m -jar ha121.jar
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It depends on the size of each Java heap dump. The size of Java heap dump file is not the size of the Java heap when the Java heap dump was generated.
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Yes, HeapAnalyzer can process Java heap dumps from IBM® SDK 1.3.1 and 1.4.x as well as Solaris J2SE 1.3.1 and 1.4.x.
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The following is an example of text heap dump:
// Version: J2RE 1.3.1 IBM Windows 32 build cn131-20020923
0x50001010 [6000] A
0x50002020
0x50002020 [4000] B
0x10007030 0x50006040 0x50004050
// EOF: //
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Here are the common exceptions and errors:
Exception in thread "main" java.lang.NoClassDefFoundError: java/util/regex/PatternSyntaxException
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HeapAnalyzer requires Java 2 SDK 1.4.1 or above. This exception is thrown if an older version of the SDK is used.
java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(Unknown Source)
at com.ibm.jinwoo.heap.FileTask$ActualTask.(FileTask.java:386)
at com.ibm.jinwoo.heap.FileTask$1.construct(FileTask.java:794)
at com.ibm.jinwoo.heap.SwingWorker$2.run(SwingWorker.java:45)
at java.lang.Thread.run(Unknown Source)
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You can see this exception while processing corrupted heap dumps, truncated heap dumps, or the files that are not supported in text heap dump format. Truncated or corrupted heap dumps are not reliable. Please refer to FAQ #4 for detailed information about the supported format.
Exception while parsing line 9 : 0x0x50003070 [1000] java/lang/String java.lang.RuntimeException
at com.ibm.jinwoo.heap.FileTask$ActualTask.(FileTask.java:321)
at com.ibm.jinwoo.heap.FileTask$1.construct(FileTask.java:794)
at com.ibm.jinwoo.heap.SwingWorker$2.run(SwingWorker.java:45)
at java.lang.Thread.run(Unknown Source)
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Some old Linux IBM SDKs generate invalid address in heap dumps. After replacing 0x0x with 0x, HeapAnalyzer can process heap dumps.
Format error while parsing line 10 : 0x50004050 0x50004050
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Unexpected format in heap dump. Possibly it is a corrupted heap dump. Further analysis is unreliable.
java.io.IOException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
at java.util.zip.GZIPInputStream.(Unknown Source)
at java.util.zip.GZIPInputStream.(Unknown Source)
at com.ibm.jinwoo.heap.OpenTask$ActualTask.(OpenTask.java:32)
at com.ibm.jinwoo.heap.OpenTask$1.construct(OpenTask.java:111)
at com.ibm.jinwoo.heap.SwingWorker$2.run(SwingWorker.java:45)
at java.lang.Thread.run(Unknown Source)
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You can see this exception when you try to load an invalid .ha (processed HeapAnalyzer file) file.
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Yes. HeapAnalyzer 1.3.3 supports the .phd format.
Java and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both.
IBM is a trademark of IBM Corporation in the United States, other countries, or both.
Other company, product, or service names may be trademarks or service marks of others.
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