"Unable to launch MATLAB" in java

I want run matlab command in java by source code:

 public class Test {
  public static void main(String args[]) throws Exception {
    MatlabEngine matEng = MatlabEngine.startMatlab(new String[] { "-useStartupFolderPref", "-nosplash", "-nodesktop", "-wait" });
                matEng.eval("a = 10;", null, null);
    matEng.eval("b = 20;", null, null);
                StringWriter output = new StringWriter();
    matEng.eval("a + b", output, null);
    System.out.println(output.toString());
         }
}

After I run this code, I should login in MATLAB because of Trial version. Login work successfuly. But, Matlab command dose not work with "com.matwork.engin.EngineException:Unable to launch MATLAB." message After successful login. How i can run matlab command line?

Perhaps, Matlab Java API isn't work in Trial version? Now I'm using Matlab 2018a trial version.

Answer 1

[Zijie Li]

I have exactly same problem that you have and can't find the solution.

Have you solve the problem?

Answer 2

[Ziyu Hua]

Hi Kim,

I also have the similar problem and the Java give an exception like:

"com.mathworks.engine.EngineException: Unable to launch MATLAB or connect a shared MATLAB session."

I resolve this problem By transform the Java 'System Enviroment Path' back to the default path of Matlab.

Which I did like this "Change the System Envioment Path" (I delete the MATLAB_JAVA), and solved the problems.

Which may be help.