How do I produce a heap dump with only a JRE?

Question

We have a JRE installed on our production environment, but not a JDK. The versions of the JRE and OS are below.

[me@mymachine ~]$ java -version
java version &         


        

Answer 1

Use jattach, a tool created by JVM hacker Andrei Pangin. It's tiny (24KB), works with just JRE and supports Linux containers.

jattach PID-OF-JAVA dumpheap