I want to set Java heap size permanently and don't want to run every jar file with options. I use Windows and Java 1.7.
Edit the -Xmx256m option. This option sets the JVM heap size. Set the -Xmx256m option to a higher value, such as Xmx1024m.
The default maximum heap size value is 256 MB .
The flag Xmx specifies the maximum memory allocation pool for a Java virtual machine (JVM), while Xms specifies the initial memory allocation pool. The Xms flag has no default value, and Xmx typically has a default value of 256 MB.
Setup JAVA_OPTS as a system variable with the following content:
JAVA_OPTS="-Xms256m -Xmx512m"
After that in a command prompt run the following commands:
SET JAVA_OPTS="-Xms256m -Xmx512m"
This can be explained as follows:
These values should be changed according to application requirements.
EDIT:
You can also try adding it through the Environment Properties menu which can be found at:
EDIT 2:
JAVA_OPTS is a system variable that stores various settings/configurations for your local Java Virtual Machine. By having JAVA_OPTS set as a system variable all applications running on top of the JVM will take their settings from this parameter.
To setup a system variable you have to complete the steps listed above from 1 to 4.
Try setting a Windows System Environment variable called _JAVA_OPTIONS
with the heap size you want. Java should be able to find it and act accordingly.
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