Before you can use the generated Java® packages in a Java development environment, ensure that your Java environment is properly configured. You must verify that:
Your system uses a version of the Java Developer’s Kit (JDK™) that is compatible with MATLAB®.
JAVA_HOME is set to the folder containing the system’s
CLASSPATH contains all of the MATLAB library JAR files and the JAR files for the packages containing
your compiled MATLAB code.
The MATLAB native library paths are properly configured.
For updated Java system requirements, including versions of Java Developer's Kit (JDK) and Java Runtime Environment (JRE™), see the supported compiler page at https://www.mathworks.com/support/compilers/current_release/.
To install the proper version of the JDK:
Verify the version of Java your MATLAB installation is using by running the following MATLAB command:
Download a Java Developer's Kit (JDK) with the same major version from https://adoptopenjdk.net/.
Install the JDK.
If you are not developing applications or compiling MATLAB code, you can use the Java Runtime Environment (JRE) instead of the JDK.
From the system command prompt, set the system environment variable
JAVA_HOME to point to your JDK installation.
For example, on Windows®, enter
If you are compiling MATLAB code, verify that MATLAB is reading the correct value of
At the MATLAB command prompt, type
getenv JAVA_HOME to
display the value of
JAVA_HOME in use by MATLAB.
Verify that the folder containing your Java installation has been added to your system
PATH environment variable.
For example, on Windows, enter
To build and run a Java application that uses a MATLAB Compiler SDK™ generated component, the system must locate:
JAR files containing the MATLAB libraries
Packages that you have developed and built
Java classes compiled with MATLAB
Compiler SDK use classes contained in the
com.mathworks.toolbox.javabuilder package. To use the
compiled classes, you need to include a file called
javabuilder.jar on the Java class path. You can find this file in one of the following
|MATLAB installed on your system|
|MATLAB Runtime installed on your system|
matlabroot refers to the root folder into which the
MATLAB installer has placed the MATLAB files.
mcrroot refers to the root
folder under which MATLAB Runtime is installed.
In addition, you need to add to the JAR files created by the compiler to the class path.
The operating system uses the native library path to locate native libraries that are needed to run your Java class. See the following list of variable names according to your operating system:
The native MATLAB or MATLAB Runtime files needed to execute the compiled MATLAB functions called from the Java code must be included on the paths listed by your system’s native library path variable. For more information, see Set MATLAB Runtime Path for Run-Time Deployment.