|Leak suspect report [message #895768]
||Sun, 15 July 2012 21:38
| Ashfaque Mohammad
Registered: November 2011
Leak suspect report shows follwoing as the suspects. But my question is about the message at the bottom, which says that these are referenced from a WeakHashMap, so shoudn't these be garbage collected during the Full-GC phase?|
279 instances of "hudson.plugins.cobertura.targets.CoverageResult", loaded by "java.net.URLClassLoader @ 0x2ac774988cc0" occupy 3,766,994,368 (19.67%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2aca4681d3b0 - 402,065,440 (2.10%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac956dfd440 - 401,219,936 (2.10%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2acac9dc2670 - 399,164,488 (2.08%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac927ac23a8 - 398,056,168 (2.08%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac9f06b5cd8 - 392,134,000 (2.05%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac97add0390 - 392,085,544 (2.05%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac8c300ffe0 - 375,067,880 (1.96%) bytes.
•hudson.plugins.cobertura.targets.CoverageResult @ 0x2ac7ef77b030 - 320,967,496 (1.68%) bytes.
These instances are referenced from one instance of "java.util.WeakHashMap$Entry", loaded by "<system class loader>"
|Re: Leak suspect report [message #895815 is a reply to message #895768]
||Mon, 16 July 2012 07:48
| Aurélien Pupier
Registered: July 2009
Location: Grenoble, FRANCE
it will if spaces is required and it is well-implemented.
See implementation note from javadoc:
Implementation note: The value objects in a WeakHashMap are held by ordinary strong references. Thus care should be taken to ensure that value objects do not strongly refer to their own keys, either directly or indirectly, since that will prevent the keys from being discarded. Note that a value object may refer indirectly to its key via the WeakHashMap itself; that is, a value object may strongly refer to some other key object whose associated value object, in turn, strongly refers to the key of the first value object. One way to deal with this is to wrap values themselves within WeakReferences before inserting, as in: m.put(key, new WeakReference(value)), and then unwrapping upon each get.
Aurélien Pupier - Red Hat
Senior Software Engineer in Fuse Tooling team
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