MATLAB: Isjava not correct

Question

When I run the following code:

 fH = figure;
 textAreaHandle = javaObjectEDT('javax.swing.JTextArea');
 scrollPaneHandle = javaObjectEDT('javax.swing.JScrollPane', textAreaHandle);
 [javaHandle,matlabHandle] = javacomponent(scrollPaneHandle,[20,20,300,50],fH);

I get a figure with a java text area. When I look at the value of javaHandle it is the following:

 javaHandle = 
     javahandle_withcallbacks.javax.swing.JScrollPane

When I run the isjava command on javaHandle, it returns a false, which is incorrect.

 >> isjava(javaHandle)
 ans = 
      0

I am wondering how can I fix this so that isjava returns true when run with this javaHandle variable? Is there another function I can use?

I am running 2015b

Thanks in advance

Answer 1

javacomponent is not a documented routine, and the output of it is not specifically a java object (it is a handle to a component, but the handle could be a MATLAB handle.)

You can get the java object by using the java method on the javaHandle