You can specify custom Java® startup options by creating a java.opts file, a text
file containing one option per line. For example, use the
-D
command to assign a property=valuevalue to a system
property.
Put the java.opts file in one of the following folders:
MATLAB® startup folder, if starting MATLAB from an operating system prompt. For more information, see MATLAB Startup Folder.
If there is no java.opts file in the startup folder, then
MATLAB checks the
matlabroot/bin/archmatlabroot is the output of the
matlabroot function. arch is
the output of the MATLAB
computer('arch') function, for example
glnxa64.
A java.opts file in this location applies to all users, but
individual users might not have permissions to modify files there.
Do not use a java.opts file in the following situations:
To enable the use of the Java debugger, use the matlab
-jdb command. For information, see matlab (Linux) or matlab (macOS).
To adjust the Java heap size on desktop versions of MATLAB, use Java Heap Memory Preferences.
To modify the static Java class path, create a javaclasspath.txt file.
For information, see Static Path.
To modify the library path, create a javalibrarypath.txt
file. For information, see Locate Native Method Libraries.
To override built-in options that MATLAB specifies to Java at startup. Options in java.opts are appended
to the end of the built-in list. Whether these additional options override
built-in options is JVM-dependent and can change between Java versions. To see what options MATLAB provides to Java, run this command:
java.lang.management.ManagementFactory.getRuntimeMXBean.getInputArguments
matlab (Linux) | matlab (macOS)