3. Heap Space in Java. Heap space in Java is used for dynamic memory allocation for Java objects and JRE classes at the runtime. New objects are always created in heap space and the references to this objects are stored in stack memory.

How much heap space does Java have?

The Java heap is the area of memory used to store objects instantiated by applications running on the JVM. Objects in the heap can be shared between threads. Many users restrict the Java heap size to 2-8 GB in order to minimize garbage collection pauses.

Is Java a heap size?

*Remember that the WAS Java process shares a 4 Gigabyte memory address space with the OS in accordance with 32 bit design specification (User Virtual Memory is 2G).