odd problem with jni interacting with dll's - not sure why a change to gc ergonomics fixes it

Posted by jim hale on Stack Overflow See other posts from Stack Overflow or by jim hale
Published on 2010-04-16T17:20:55Z Indexed on 2010/04/16 17:23 UTC
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jni

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Windows

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java

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gc

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ergonomics

We were having a problem with our Tomcat jvm blowing up and giving us an hs_* dump at random times but always in the same spot, that wasn't very informative other than saying we had an EXCEPTION_ACCESS_VIOLATION Commenting out various parts of the java that called particular jni functions just made it blow consistently in another spot.

By changing our jvm options from: set PAF_OPTS=-Xms1024m -Xmx32000m -server -XX:+UseParallelGC -XX:+UseParallelOldGC -XX:+DisableExplicitGC -XX:+UseCompressedOops -Djava.library.path="%CATALINA_HOME%"\jni -Dcom.sun.management.jmxremote

TO set PAF_OPTS=-Xms1024m -Xmx32000m -server -XX:+DisableExplicitGC -XX:+UseCompressedOops -Djava.library.path="%CATALINA_HOME%"\jni -Dcom.sun.management.jmxremote

The problem went away. The solution does not give me a warm and fuzzy however and am wondering anyone might understand what's going on under the covers here.

Environment: jdk1.6, 64 bit OS and Java, Tomcat, Windows

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