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What happens when I press the "Run Garbage Collector" button in Eclipse? Does it just call System.gc()?
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To prevent applications running out of memory, objects in the Java heap that are no longer required must be reclaimed. This process is known as garbage collection (GC).
On the Summary of Servers page, select the server instance for which you will request garbage collection. Select Monitoring > Performance. Click Garbage Collect. Garbage Collect calls the JVM's System.
You can call Garbage Collector explicitly, but JVM decides whether to process the call or not. Ideally, you should never write code dependent on call to garbage collector.
Yes, it is strictly a call to the JVM, not to an internal Eclipse function (see this thread).
Don't forget the Memory Analyzer to also check paths to garbage collection roots (in a Head Dump) if you suspect some memory leaking in your Eclipse session.
Note: that button is only available if you select the "Show Heap status" in the General section of the Eclipse preferences:
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Yes, the System.gc() is called!
Very useful in the Eclipse –>Preferences–>General-> Show heap status
then you can see in the lower right corner the "trash can" to run the Garbage Collector. =)
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