The “java.lang.OutOfMemoryError: Java heap space” error occurs when the Java Virtual Machine (JVM) runs out of memory during program execution. To resolve it, you can:
1. Increase Heap Size: Adjust the JVM heap size using the -Xms (initial heap size) and -Xmx (maximum heap size) options. Example:
java -Xms512m -Xmx2g MyClass
2. Optimize Memory Usage: Review the code to ensure efficient memory management. Avoid memory leaks, reduce object creation, and utilize proper data structures.
3. Use Profiling Tools: Tools like VisualVM can help identify memory consumption patterns and optimize accordingly.