By default, JVM does not specify a way to perform a full garbage collection by a user request. You may know about java.lang.System.gc(), but then you must already know that this function only suggests to the JVM to run garbage collection.
Fortunately there is ForceGarbageCollection() defined in JVM Tool Interface (JVMTI) spec. And that's what this library here is all about.
You can just grab precompiled binaries from out/ in this repo.
But building everything by yourself is easy, too.
Open your shell and cd into this repo directory.
javac -source 1.5 -target 1.5 src/jvmforcegcagent/main/java/name/ltp/jvmforcegcagent/JvmForceGcAgent.java && cd src/jvmforcegcagent/main/java && jar cvf ../../../../out/jvmforcegcagent.jar name/ltp/jvmforcegcagent/JvmForceGcAgent.class && rm name/ltp/jvmforcegcagent/JvmForceGcAgent.class && cd ../../../../
gcc -shared -Wall -D_JNI_IMPLEMENTATION_ -Wl,--kill-at -I"%JAVA_HOME%/include" -I"%JAVA_HOME%/include/win32"^
-o out/jvmforcegcagent-win32.dll^
src/jvmforcegcagent/main/native/jvmforcegcagent.c^
&& strip out/jvmforcegcagent-win32.dll
gcc -shared -Wall -D_JNI_IMPLEMENTATION_ -Wl,--kill-at -I"%JAVA_HOME%/include" -I"%JAVA_HOME%/include/win32"^
-o out/jvmforcegcagent-win64.dll^
src/jvmforcegcagent/main/native/jvmforcegcagent.c^
&& strip out/jvmforcegcagent-win64.dll
cc -shared -Wall -fpic -I$JAVA_HOME/include/ -I$JAVA_HOME/include/linux/ \
-o out/libjvmforcegcagent-tux64.so \
src/jvmforcegcagent/main/native/jvmforcegcagent.c \
&& strip out/libjvmforcegcagent-tux64.so
java -agentpath:jvmforcegcagent/out/jvmforcegcagent-win32.dll -Djava.library.path=jvmforcegcagent/out/ -cp jvmforcegcagent/out/* com.example.YourApp
java -agentpath:jvmforcegcagent/out/jvmforcegcagent-win64.dll -Djava.library.path=jvmforcegcagent/out/ -cp jvmforcegcagent/out/* com.example.YourApp
java -agentpath:jvmforcegcagent/out/libjvmforcegcagent-tux64.so -Djava.library.path=jvmforcegcagent/out/ -cp jvmforcegcagent/out/* com.example.YourApp
if(name.ltp.jvmforcegcagent.JvmForceGcAgent.i() != null)
name.ltp.jvmforcegcagent.JvmForceGcAgent.i().forceGc();
Licensed under the CC0 1.0: http://creativecommons.org/publicdomain/zero/1.0/