Why does calling the value of a JAVA object from its parent class cause MATLAB 7.0.4 (R14SP2) to crash?

I use the following steps:

1. Create a simple JAVA class:

public class Matrix {

       public Object m;

       public Matrix(Object v) {

            m = v;

       }

       public Object getM() {

             return m;

       }

}

2. From within MATLAB, create the JAVA object:

obj = Matrix(rand(3));

3. Retrieve the value of the object:

m = obj.m;  % this crashes MATLAB

Step 3 causes MATLAB to crash.

Answer 1

[MathWorks Support Team]

This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

This behavior is due to a known bug in MATLAB 7.0.4 (R14SP2). The workaround is to create a new method within the parent class that returns the value of the target object, and then call the method.

For example, to retrieve the value of the object:

1. Create a simple JAVA class:

public class Matrix {

       public Object m;

       public Matrix(Object v) {

            m = v;

       }

       public Object getM() {

             return m;

       }

}

2. From within MATLAB, create the JAVA object:

obj = Matrix(rand(3));

3. Replace step 3 from above with the following:

m = obj.getM;   % this works