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To Configure the JVM General Settings
The Java Virtual Machine (JVM) enables Java byte codes to run on a
physical machine. Tuning the JVM settings improves performance and avoids memory allocation errors.

The Java Virtual Machine is included in the Java Platform, Standard Edition (Java
SE platform), which is required by the GlassFish Server. Incorrect JVM settings will
prevent the server from running, so use care when changing these settings.


Note - The terms “Java Virtual Machine” and “JVM” mean a Virtual Machine for the
Java platform.




In the navigation tree, select the Configuration node.
Under the Configuration node, select the JVM Settings node.The JVM General Settings page opens.
On the JVM General Settings page, in the Java Home field, type the
name of the installation directory of the Java SE software.The GlassFish Server relies on the Java SE platform. To verify that the
version of Java SE software that you specify is supported in this release,
see the Oracle GlassFish Server 3.1 Release Notes. If you enter a nonexistent directory name or the directory
for an unsupported version of Java SE software, then GlassFish Server will not
start.
In the Javac Options field, type the command-line options for the Java programming
language compiler.The GlassFish Server runs the compiler when Enterprise JavaBeans (EJB) components are deployed.
Select the Debug Enabled checkbox to enable debugging with the Java Platform Debugger
Architecture (JPDA).JPDA is used by application developers. For more information, see the Oracle GlassFish Server 3.1 Application Development Guide.
In the Debug Options field, type the JPDA options to be passed to
the JVM.This field is applicable only if debugging was enabled in the preceding step.
In the RMI Compile Options field, type the command-line options for the rmic
compiler.The GlassFish Server runs the rmic compiler when EJB components are deployed.
In the Bytecode Preprocessor field, type a list of class names.Use commas to separate class names. Each class must implement the com.sun.appserv.BytecodePreprocessor
interface. The classes are called in the order specified.
(Optional) In the Additional Properties section, specify additional properties.To add a property, click the Add Property button. In the blank row
that appears, type the property name in the Name field, and type the
property value in the Value field.
The GlassFish Server does not define any additional properties for the JVM.
Click Save.
Tip - To return to the default settings, click the Load Defaults button, then click
Save.




Restart the server.
See Also
To Configure the JVM Path Settings


To Configure the JVM Options


To Disable the Security Manager


To Configure the JVM Profiler Settings




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