Software⏱️ 2 min read📅 2026-05-31

How to Fix: How to deal with "java.lang.OutOfMemoryError: Java heap space" error?

Optimize Java application memory usage to prevent OutOfMemoryError.

Quick Answer: Use the -Xms and -Xmx options to set a fixed initial heap size and maximum heap size, respectively.

📋 Table of Contents

  1. ☐ Why This Happens
  2. ☑ Proven Troubleshooting Steps
  3. ☒ Conclusion

How to deal with ½java.lang.OutOfMemoryError: Java heap spaceû error?

☐ Why This Happens

  • When a Java application runs out of memory, it throws an OutOfMemoryError. In your case, the user can open unlimited number of files and the program keeps the opened objects in the memory.

☑ Proven Troubleshooting Steps

Method 1: Memory Management

  1. Step 1: Set the initial and maximum heap size using the -Xms and -Xmx command line arguments when running your Java application.

Method 2: Garbage Collection

  1. Step 1: Enable the garbage collection by adding the -XX:+UseConcMarkSweepGC command line argument when running your Java application.

☒ Conclusion

By following these steps, you can prevent the OutOfMemoryError and ensure that your Java Swing application runs smoothly.

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