Unable to run EngineGUIDemo in Java Engine

I followed the directions in the README file, but I still get the error:

c:\Temp\MATLABJavaEngine>java -Djava.library.path="c:\Program Files\MATLAB\R2016b\bin\win64" -classpath .;"c:\Program Files\MATLAB\R2016b\extern\engines\java\jar\engine.jar" EngineConsoleDemo Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Program Files\MATLAB\R2016b\bin\win64\nativemvm.dll: Can't find dependent libraries

        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(Unknown Source)
        at java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.lang.Runtime.loadLibrary0(Unknown Source)
        at java.lang.System.loadLibrary(Unknown Source)
        at com.mathworks.mvm.MvmImpl.loadLibrary(MvmImpl.java:107)
        at com.mathworks.mvm.MvmImpl.setJavaEngineMode(MvmImpl.java:202)
        at com.mathworks.engine.MatlabEngine.<clinit>(MatlabEngine.java:69)
        at EngineConsoleDemo.main(EngineConsoleDemo.java:16)

Failed to load nativemvm library: C:\Program Files\MATLAB2016b\bin\win64\nativemvm.dll: Can't find dependent libraries

Answer 1

[J.Eric Tkaczyk]

I had the same problem and solved it in the following way.

First allow this dll you are loading to see all the other dlls it depends upon. You do this by editing the Windows Environment PATH variable to include C:\Program Files\MATLAB\R2016b\bin\win64\

Then add dependency to your module to engine.jar. In IntelliJ this is done in ProjectStrucuture/Modules/yourModule dialog box and select the dependency tab, plus sign and navigate to your engine.jar location

Make all the dlls needed for java by including this command line argument in the run configuration: -Djava.library.path="C:\Program Files\MATLAB\R2016b\bin\win64"

Now include this as the first line of you main method to have all the methods available to your application: System.loadLibrary("nativemvm");

[Alex Phung]

Thank you. I was able to make it work without having to System.loadLibrary("nativemvm");

Do you know of any solution that does not require setting the Environment PATH variable? I need this to run on another host application, and I prefer not to ask the user to set the PATH.

[Chibing Gng]

Dear Alex Phung and J.Eric Tkaczyk,

I installed Matlab 2016b, but no extern\engines\java\jar\engine.jar. Could you tell me how you installed ?

Thanks Spencer

[Bo Li]

This file is part of the R2016b MATLAB installation by default.

Answer 2

[Bo Li]

Adding "<matlabroot>/bin/win64" to the system environment variable PATH is required, otherwise, Java doesn't know where to find the dynamic shared libraries. "-Djava.library.path" helps only in finding the native library directly used by the Java file, but it doesn't help the native library to find its dependent libraries.

If requesting a user to set the PATH is not desired, maybe the Java command can be placed in a batch file which sets the PATH before running the Java command.

[James Hong]

Also, make sure that the entry is added to the top of the PATH environment variable.

[Justin Livermore]

Thank you. I added it to the top and it fixed my issue. Glad I found this.