Java Heap memory


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Java heap memory refers to the portion of memory in the Java Virtual Machine (JVM) that is allocated for storing objects created by Java applications during runtime. It is where Java objects are dynamically allocated and managed by the garbage collector.

Configuring the Java heap memory size is important for optimizing the performance and stability of Java applications. If the heap size is too small, the application may run out of memory and encounter OutOfMemoryError exceptions. On the other hand, if the heap size is too large, it may lead to longer garbage collection pauses and increased memory usage, potentially causing performance issues.

You can specify the initial and maximum heap size using the -Xms and -Xmx JVM options, respectively. For example, -Xms512m -Xmx1024m sets the initial heap size to 512 MB and the maximum heap size to 1024 MB.

There are multiple tools that we can install and check Java heap memory

For example,

jmap -heap <PID>