Classloader Tracing Tool

This tool assists with discovering where classes get loaded from. It was derived from the following post: https://blogs.oracle.com/sundararajan/entry/tracing_class_loading_1_5

Simply enable it with:

-javaagent:<path>/classload-tracer.jar=log=classloading.log,classPattern=.*

Both log and classPattern are optional. Without the log option, output will be sent to stdout.

The classPattern option is a regular expression which, when matched against the classname being loaded, will print a stack trace for the call which triggered the request.

The output of the tool looks something like this:

2014/03/70 15:44:49.923 - [classloader=sun.misc.Launcher$AppClassLoader@1e1ff563, thread=Thread[main,5,main]] loaded com/gemstone/gemfire/InternalGemFireException from jar:file:/Users/jdeppe/gemfire/70/lib/gemfire.jar!/com/gemstone/gemfire/InternalGemFireException.class
    <...>
    java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    com.gemstone.gemfire.i18n.StringId.getBundle(StringId.java:77)
    com.gemstone.gemfire.i18n.StringId.setLocale(StringId.java:63)
    com.gemstone.gemfire.i18n.StringId.<clinit>(StringId.java:46)
    com.gemstone.gemfire.internal.i18n.ParentLocalizedStrings.<clinit>(ParentLocalizedStrings.java:21)
    com.gemstone.gemfire.distributed.LocatorLauncher.<clinit>(LocatorLauncher.java:76)

Building

Simply do:

mvn clean package

This produces two artifacts in target/. Make sure to use the -with-dependencies.jar as it contains the correct manifest entries required to run.