In Java performance testing, one of the most common and sometimes most frustrating issues is the memory leak. Even the most experienced engineer can slip a memory leak into their code. It is important to know how to spot one and debug the issue. Even if you can’t find the source of the issue without a developer’s help, they will always need data to work with so being able to provide useful information is crucial. Therefore, for a Java memory leak, the first thing you will always be asked for is a heap dump.