You can specify Java™ options
and system properties directly on the command line. You can also use
an options file or an environment variable.
About this task
The sequence of the Java options on the command line
defines which options take precedence during startup. Rightmost options have precedence over
leftmost options. In the following example, the -Xjit option takes
precedence:java -Xint -Xjit myClass
For more information about how the Eclipse
OpenJ9 VM constructs the runtime environment at startup, see Specifying command line
options. Use one of more of the options that are shown in the procedure to customize your
runtime environment.
Procedure
-
Specify options or system properties on the command line, as shown in the following
example:
java -Dmysysprop1=tcpip -Dmysysprop2=wait -Xdisablejavadump MyJavaClass
-
Create an environment variable that is called IBM_JAVA_OPTIONS containing
the options, as shown in the following example:
export IBM_JAVA_OPTIONS="-Dmysysprop1=tcpip -Dmysysprop2=wait -Xdisablejavadump"
On Windows, use set
instead of
export
.
-
Create a file that contains the options, and specify that file on the command line or in the
IBM_JAVA_OPTIONS environment variable by using the
-Xoptionsfile parameter. For more information about constructing this file, see
-Xoptionsfile.