IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using dump agents > Dump agents

Stack dumps

Stack dumps are very basic dumps in which the status and Java™ stack of the thread is written to stderr. Stack dumps are very useful when used together with the "allocation" dump event to identify Java code that is allocating large objects.

In the following example, the main thread has allocated a byte array of size 1549128 bytes:

JVMDUMP006I Processing dump event "allocation", detail "1549128 bytes, type byte[]" - please wait.
Thread=main (0188701C) Status=Running
        at sun/misc/Resource.getBytes()[B (Resource.java:109)
        at java/net/URLClassLoader.defineClass(Ljava/lang/String;Lsun/misc/Resource;)Ljava/lang/Class; 
(URLClassLoader.java:489)
        at java/net/URLClassLoader.access$300(Ljava/net/URLClassLoader;Ljava/lang/String;Lsun/misc/
Resource;)Ljava/lang/Class; (URLClassLoader.java:64)
        at java/net/URLClassLoader$ClassFinder.run()Ljava/lang/Object; (URLClassLoader.java:901)
        at java/security/AccessController.doPrivileged(Ljava/security/PrivilegedExceptionAction;Ljava/
security/AccessControlContext;)Ljava/lang/Object; (AccessController.java:284)
        at java/net/URLClassLoader.findClass(Ljava/lang/String;)Ljava/lang/Class; (URLClassLoader.
java:414)
        at java/lang/ClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class; (ClassLoader.java:643)
        at sun/misc/Launcher$AppClassLoader.loadClass(Ljava/lang/String;Z)Ljava/lang/Class; (Launcher.
java:345)
        at java/lang/ClassLoader.loadClass(Ljava/lang/String;)Ljava/lang/Class; (ClassLoader.java:609)
        at TestLargeAllocations.main([Ljava/lang/String;)V (TestLargeAllocations.java:49)

Parent: Dump agents

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