If a program is plagued with slow service, the system unexpectedly crashes and is prone to hanging and pausing on its own, or takes up excessive CPU power and memory; the odds are that there are certain bugs in it that need to be removed as soon as possible. However, for debugging, it is necessary that you have the requisite data before you commence any rectification procedures.
Fortunately, there exists a vast number of tools that may potentially help provide all the necessary information that you need to be able to fix the program. Some of these tools may be part of the JVM itself, while some tools have been developed by third-party specialists.
We will look at some of the most simple ones that may prove to be helpful once the program or application (as the case may be) starts performing unexpectedly.