How to Fix \"java.lang.OutOfMemoryError: Java heap space\" by Increasing JVM Heap Size?

Increasing Heap Size of JVM: Resolving OutOfMemoryError

When encountering the "java.lang.OutOfMemoryError: Java heap space" error, it is likely that the Java Virtual Machine (JVM) has run out of memory. To prevent this issue, you can increase the heap size of the JVM.

Heap Size Parameters

The heap size of the JVM can be adjusted using the following parameters:

• -Xms: Initial heap size
• -Xmx: Maximum heap size
• -Xss: Thread stack size

Increasing the Heap Size

To increase the heap size, specify the -Xmx parameter with the desired size. For instance, to set the maximum heap size to 256 megabytes (MB), use the following command:

java -Xmx256m <program_name>

Example

In your case, the OutOfMemoryError is reported in the TestData.java program. To resolve this issue, you can increase the heap size as follows:

java -Xmx256m TestData.java

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