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Memory leak detection & analysis

Problem: Memory leaks are causing application slowdowns, crashes, and poor user experience.

Solution using FusionReactor:

  1. Detect memory leaks:

    • Open FusionReactor and navigate to the Memory Overview page.
    • Monitor heap usage trends over time and watch for consistent growth that does not return to baseline.
    • Pay attention to garbage collection activity - excessive GC with little memory recovery is a key warning sign.

    Learn more

    Garbage Collection

  2. Analyze the root cause:

    • Review thread activity to detect blocked or memory-holding threads.
    • Use Crash Protection to trigger garbage collection at key moments and observe the impact.
    • Take heap dumps and analyze them with Eclipse MAT to identify large or growing objects not being released.
    • Common causes include:
      • Static collections retaining objects indefinitely.
      • Listeners not properly unregistered.
      • Caching issues causing excessive memory consumption.

  3. Resolve the issue:

    • Remove unnecessary object references and ensure objects are released when no longer needed.
    • Fix code patterns causing memory retention (see above).
    • Adjust JVM memory settings and garbage collection strategies if needed.

  4. Validate the fix:

    • Re-check memory metrics in FusionReactor and confirm heap usage has returned to expected levels.
    • Monitor GC behavior to ensure memory pressure has reduced.
    • Configure Crash Protection alerts for abnormal memory trends to catch future regressions early.