Help with calling a java application from inside another one

Question

Hello!
I am having this problem which is getting on my nerves and dont know how to solve..
I want to call from my java application, another java application. So i use the exec command. Then i want to read the output of this execution from my own application, (the "parent" process).
But it doesn work properly. Something seems to happen and i dont get the whole output.
The java program i want to call is created for running an application created with Matlab java builder.
This program works when called from cmd, but seems not to work when called from inside a java application.
The code of my java application is:
Runtime rt = Runtime.getRuntime();
Process child;
// The java class getmagic is a special kind of java file that uses classes that work in matlab. It uses a component (.jar) file that is created from matlab java builder. thats why it wants the -classpath and the rest options.
//I hope you wont get messed up in here.
String[] callAndArgs = {"java","-classpath",".;C:\\Program Files\\MATLAB\\R2006b\\toolbox\\javabuilder\\jar\\javabuilder.jar;..\\MagicDemoComp\\magicsquare\\distrib\\magicsquare.jar -Djava.library.path=C:\\Program Files\\MATLAB\\R2006b\\bin\\win32;","getmagic","4"};
try{
child = rt.exec(callAndArgs);
InputStream is = child.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
is.close();
System.out.println(child.waitFor());
System.out.println("Finished");
}catch(IOException e) {
System.err.println("IOException starting process!");
}catch(InterruptedException e) {
System.err.println("InterruptedException starting process!");
The java program (getmagic) thats uses matlab gives the following output (after some time) when called in cmd with argument 4
Magic square of order 4
16 2 3 13
5 11 10 8
9 7 6 12
4 14 15 1
My program shown above only prints:
Magic square of order 4
1
Finished.
Do i do something wrong? How can i get the rest of the output???
Thank you very much in advance,
Stacey
PS: I am sorry for the length of my post.

Answer 1

Hello CaptainMorgan08, thanx for the instant reply.
I tried, but no, i cant.
Because i cannot include this java aplication that uses matlab into my application, cause 1) it needs special arguments in the compiler and during execution so it can be run and 2) it uses classes that java doesnt have. only the java-like matlab code.
For example it uses:
import com.mathworks.toolbox.javabuilder.*;
import magicsquare.*; //the component which is made from matlab java builder.
So i cannot compile it with my application!
If you know of a way, please let me know!
I know i might be missing something.. something that is obvious to you.. but i ve been working days=nights hardly no sleep..so you can excuse me if i say something foolish..
Message was edited by:
Stacey_Gr