What methods can be used to detect memory leaks in applications?

To identify memory leaks in Java applications, the following methods and tools are used:

• Memory profiling with tools like VisualVM, JProfiler, YourKit, or Eclipse Memory Analyzer (MAT). They analyze memory usage, take heap dumps, and find objects that are not released.
• Heap dumps — snapshots of memory state, analyzed to find objects holding onto memory.
• GC monitoring — analyzing garbage collector logs helps understand how often and how effectively memory is cleaned.
• Static analysis tools — to identify potential memory management issues.
• Code review and testing — checking proper resource closure, use of WeakReferences, avoiding cyclic references.

Example with VisualVM:

1. Run the application with JMX enabled or connect via VisualVM.
2. Attach to the process.
3. Take a heap dump.
4. Analyze long-lived objects and their references to find causes of leaks.