Based on my previous post related to Java Memory Allocation – Heap and Stack let’s see the difference.
| Heap Space | Stack Memory |
|---|---|
| Heap memory is used by all the parts of the application. | Stack memory is used only by one thread of execution. |
| Whenever an object is created, it’s always stored in the Heap space and stack memory contains the reference to it. | Stack memory only contains local primitive variables and reference variables to objects in heap space. |
| Objects stored in the heap are globally accessible. | Stack memory can’t be accessed by other threads. |
| We can use -Xms and -Xmx JVM option to define the startup size and maximum size of heap memory. | We can use -Xss to define the stack memory size |
| When Heap memory is full, it throws java.lang.OutOfMemoryError: Java Heap Space error | When stack memory is full, Java runtime throws java.lang.StackOverFlowError |
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