Could not reserve enough space for object heap to start JVM

Question

Just faced with strange issue  When i type  java -version   i got  Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine       java -Xms64m -Xmx64m -version   This command works fine  java version  1 6 0 24  Java TM  SE Runtime Environment  build 1 6 0 24-b07  Java HotSpot TM  Client VM  build 19 1-b02  mixed mode    If i change xms  xmx to 128m  i get error again    Using top command and free -m i can see  that i got over 192 mb free  so why i still get this error    Mem     262144k total     64760k used    197384k free         0k buffers Swap         0k total         0k used         0k free         0k cached   Thank you

User · Accepted Answer

It looks like the machine you re trying to run this on has only 256 MB memory   Maybe the JVM tries to allocate a large  contiguous block of 64 MB memory  The 192 MB that you have free might be fragmented into smaller pieces  so that there is no contiguous block of 64 MB free to allocate   Try starting your Java program with a smaller heap size  for example   java -Xms16m

User · Answer

According to this post this error message means      Heap size is larger than your computer s physical memory    Edit  Heap is not the only memory that is reserved  I suppose  At least there are other JVM settings like PermGenSpace that ask for the memory  With heap size 128M and a PermGenSpace of 64M you already fill the space available   Why not downsize other memory settings to free up space for the heap

User · Answer

I had the same problem when using a 32 bit version of java in a 64 bit environment  When using 64 java in a 64 OS it was ok

[java] Could not reserve enough space for object heap to start JVM

Examples related to java

Examples related to linux

Examples related to memory

Examples related to jvm