A linux / mac command line tool that will dump the heap of any Java [6,7,8] process. It works in a way similar to VisualVM, which is significantly faster and more reliable than jmap.
It requires a local tools.jar to build and will use the Java version set in $JAVA_HOME. It also requires a local tools.jar to run.
mvn clean package
After building the jar, copy heapdumper.sh and heapdumper.jar into a directory on any machine to use.
There are two required command line arguments. A Java PID and an absolute path to a directory to write the heap dump.
./heapdumper.sh -pid=xxxx -dir=/tmp