How to determine if Java memory is leaking? What tools are available for this?

Signs of memory leaks in Java:

• Continuous growth of heap usage in monitoring without decrease after garbage collection.
• Frequent or long garbage collector pauses.
• OutOfMemoryError.

Tools for diagnosis:

• jvisualvm — visual monitoring of memory and threads.
• jconsole — real-time JVM monitoring.
• Java Flight Recorder (JFR) — profiling and data collection about JVM operation.
• Eclipse MAT (Memory Analyzer Tool) — heap dump analysis to find leaks.
• YourKit, JProfiler — commercial profilers with advanced features.

Example: you can take a heap dump using jcmd and analyze it in Eclipse MAT to find objects that are not released and accumulate.