How to increase Tomcat Heap Size (JVM Heap size) in Windows ?

When you get Java Heap memory related error java.lang.OutOfMemoryError. It is  basically is  JVM heap size problem.  So for increasing the JVM Heap Size of Tomcat in Windows two way is there.

Method 1:
You have to create environment variable with name JAVA_OPTS and value -Xms256m -Xmx512m of course you can change the 256 and the 512 to whatever values you want. Here is the step by step process.

1. Right click on  computer icon and click on properties.

2. Click on  advanced system setting link.
3. Select the advanced tab.Here is the screen shot.

4. Click on Environment Variables button.
5. On system variables part :
- Click on new button.
- In the variable name, type : JAVA_OPTS
- In the variable value, type: -Xms256m -Xmx512m
- Click ok -> ok ->ok.
Now you have the environment variable JAVA_OPTS set to -Xms256m -Xmx512m.

Here  -Xms256m (minimum of 256 MB)
          -Xms512m (maximum of 512 MB)


Method 2:

Go to catalina.bat, catalina.bat is present in bin folder of your Tomcat Directory, and set this.

set JAVA_OPTS=-Xms128m -Xmx192m

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