Java Tools Tutorials - Herong's Tutorial Notes - Version 5.31, by Dr. Herong Yang
Viewing a Heap Dump File
This section provides a tutorial example on how to view a heap dump file with Java VisualVM. It allows you to see list of classes with object counts and total sizes.
Java VisualVM can also be used to view a heap dump file created previously by Java VisualVM or other Java tools.
1. Run Java VisualVM.
2. Click "File > Load..." menu. Find and load the heap dump file, heap_dump.hprof, created in the previous tutorial.
3. Click the Classes tab.
A list of all classes is displayed with their objects and total memory sizes
as shown below:
4. Find the java.lang.String class, which has 12,901 objects (instances) and uses 8.7% of the heap memory.
5. Double-click on java.lang.String to list all objects of this class. Java VisualVM switches the Instances tab with detailed info of the first object.
6. Find the "value" in the Fields panel.
You see this java.lang.String object contains "file:/C:/Program%20Files/Java/jdk1.8.0/..." as shown below:
Last update: 2015.
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