Could not reserve enough space for object heap

Question

I am getting the following exception repeatedly each time I try to run the program.

Error occurred during initialization of VM

Could not reserve e

Answer 1

Assuming you have enough free memory and you setup you JVM arguments correctly, you might have a problem of memory fragmentation. Check Java maximum memory on Windows XP.

Answer 2

I got the same error and resolved this by configuring it in the run.conf.bat

Run the JVM with the configuring run.conf.bat in Jboss5x

If free memory is not available AS you are passing in the statement then please make changes in run.conf.bat

set "JAVA_OPTS=-Xms512m -Xmx512m -XX:MaxPermSize=256m"

Answer 3

I had similar issues. I had installed 32 bit version of Java on a 64 bit machine.

By uninstalling that version and installing 64 bit version of Java. I was able to resolve the issue.

Answer 4

Go to Start->Control Panel->System->Advanced(tab)->Environment Variables->System Variables->New:

Variable name: _JAVA_OPTIONS
Variable value: -Xmx512M

Answer 5

Run the JVM with -XX:MaxHeapSize=512m (or any big number as you need) (or -Xmx512m for short)

Answer 6

Error :

For the error, "error occurred during initialization of vm could not reserve enough space for object heap jboss"

Root Cause :

• Improper/insufficient memory allocation to our JVM as mentioned below.

• e.g. JAVA_OPTS="-Xms1303m -Xmx1303m -XX:MaxPermSize=256m" in jboss-eap-6.2\bin\standalone.conf or "JAVA_OPTS=-Xms1G -Xmx1G -XX:MaxPermSize=256M" in jboss-eap-6.2\bin\standalone.conf.bat which is nothing but JVM memory allocation pool parameters.

Resolution :

• Increase the heap size. To increase the heap size,
• goto -> jboss-eap-6.2\bin\standalone.conf.bat or jboss-eap-6.2\bin\standalone.conf
• change ->JAVA_OPTS="-Xms256m -Xmx512m -XX:MaxPermSize=256m" where -Xms is Minimum heap size and -Xmx is Maximum heap size.

• Usually its not recommanded to have same size for min and max.

• If you are running your application from eclipse,

• Double click on the server
• select 'open launch configuration' you will be redirected to the window 'Edit launch configuration properties'.
• In this windown goto the tab '(x)=Arguments'.
• In VM Arguments, define your heap size as mentioned below
• "-Dprogram.name=JBossTools: JBoss EAP 6.1+ Runtime Server" -server -Xms256m -Xmx512m -XX:MaxPermSize=256m -Dorg.jboss.resolver.warning=true