Meaning of the "Unloading class" messages

Posted by elec on Stack Overflow See other posts from Stack Overflow or by elec
Published on 2010-05-14T12:15:07Z Indexed on 2010/05/14 12:54 UTC
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Anyone can explain why the lines below appear in the output console at runtime ?

(one possible answer would be full permGen, but this can be ruled out since the program only uses 24MB out of the max100MB available in PermGen)

[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor28]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor14]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor4]
[Unloading class sun.reflect.GeneratedMethodAccessor5]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor38]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor36]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor22]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor8]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor39]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor16]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor2]
[Unloading class sun.reflect.GeneratedConstructorAccessor1]

The program runs with the following params:

-Xmx160M
-XX:MaxPermSize=96M
-XX:PermSize=96M
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC
-XX:+PrintGCTaskTimeStamps
-XX:+PrintHeapAtGC
-XX:+PrintTenuringDistribution
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps
-XX:+PrintGCTimeStamps
-verbose:gc
-Xloggc:/logs/gc.log

There's plenty of space in the heap and in permGen.

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