Error java.lang.OutOfMemoryError: GC overhead limit exceeded

The java.lang.OutOfMemoryError: GC overhead limit exceeded error occurs when the garbage collector spends over 98% of the time recovering less than 2% of the heap. This typically happens when the application has a memory leak or is trying to allocate a very large object that exceeds the available heap size.

To fix the OutOfMemoryError, you can try the following approaches:

1. Increase the heap size: You can increase the heap size of the JVM by using the -Xmx command-line option. For example, to increase the heap size to 1 GB, you can use the following command:

java -Xmx1g MyClass

You can also add -XX:+HeapDumpOnOutOfMemoryError to automatically generate a heap dump when the error occurs, which helps diagnose the root cause.

2. Fix the memory leak: If the OutOfMemoryError is caused by a memory leak, you can try to find the root cause of the leak and fix it. You can use a tool like the Eclipse Memory Analyzer (MAT) to analyze the heap dump and identify the objects that are causing the leak.

3. Use a more memory-efficient data structure: If you are storing large collections, consider using a data structure or library optimized for lower memory usage. For example, instead of standard HashMap or HashSet, you can use primitive collections (e.g., fastutil or Eclipse Collections) or specialized structures like BitSet for boolean flags to significantly reduce overhead.

I hope this helps! Let me know if you have any other questions.