java - Tool to view objects in permgen -

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i have problems permgen overflow. tools can use view classes loaded permgen , how memory use? thanks.

maybe have large code base or interning lots of strings.

try jmap:

jmap -permstat <pid>

(note: permstat option not available in windows)

example:

$ jmap -permstat 22982 attaching process id 22982, please wait... debugger attached successfully. server compiler detected. jvm version 17.0-b16 100691 intern strings occupying 5641096 bytes. finding class loader instances ..finding object size using printezis bits , skipping over... done. computing per loader stat ..done. please wait.. computing liveness..done. class_loader    classes bytes   parent_loader   alive?  type  <bootstrap>     303     1355992   null          live    <internal> 0xdd159fe8      9       94104   0xdd153c30      live    sun/misc/launcher$appclassloader@0xae7fcfa0 0xdd153c30      0       0         null          live    sun/misc/launcher$extclassloader@0xae7b0178  total = 3       312     1450096     n/a         alive=3, dead=0     n/a

you can try dumping heap file , loading eclipse memory analyser, give useful information such leak suspects report , dominator tree.

jmap -dump:format=b,file=heap.bin 22982

if necessary, can increase permgen space using -xx:maxpermsize jvm option.


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