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

Question

MathWorks Support Team 2009-6-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95013-why-does-calling-the-value-of-a-java-object-from-its-parent-class-cause-matlab-7-0-4-r14sp2-to-cra

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.

请先登录，再回答此问题。

Answer 1

MathWorks Support Team 2009-6-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95013-why-does-calling-the-value-of-a-java-object-from-its-parent-class-cause-matlab-7-0-4-r14sp2-to-cra#answer_104365

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;
       }
}