Before you can use the generated Java® packages in a Java development environment, you need to 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 JDK installation.
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.
Note
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:
version -java
Download a Java Developer's Kit (JDK) with the same major version from https://adoptopenjdk.net/.
Install the JDK.
Note
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 set JAVA_HOME=.path_to_Java_install
If you are compiling MATLAB code, verify that MATLAB is
reading the correct value of JAVA_HOME.
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 set PATH=%PATH%;.path_to_Java_install
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
folders:
| MATLAB installed on your system | |
| MATLAB Runtime installed on your system | |
Note
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 operating system:
| Windows | PATH |
| Linux® | LD_LIBRARY_PATH |
| Macintosh | DYLD_LIBRARY_PATH |
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.