Executing another program in Java
Hi,
Im trying to run a java application from inside another one. After reading up about it on these forums, as well as some other places, I tried out example code from these forums. All I do at the moment is run a java class called Hello. This class just has a main method that Prints out "Hello world."
I can get this to run in the example, but I cant get the Hello program to display its output.
If I do this:
proc1 = Runtime.getRuntime().exec("java c:\\Java\\Hello");
then I get absolutely no output. I tried putting "java c:\java\Hello" inside a .bat file, and I output from the batch file, but not from my java program.
out :
out :C:\Java\executeprocess>java Hello
Here is a snip of the code, without the main method, variables, and so on.
try{
proc1 = Runtime.getRuntime().exec("c:\\java\\Test.bat");
input = proc1.getInputStream();
in =new BufferedReader(new InputStreamReader(input));
err =new BufferedReader(new InputStreamReader(input));
out =new PrintWriter(proc1.getOutputStream());
}catch (Exception e1){
e1.printStackTrace();
}
String line ="";
while ((line=in.readLine()) !=null){
System.out.println("out: " + line);
}
Any ideas what the problem might be?
On a side note, I know I could just run the main method of this class in my java program, but I dont have the source of the class I want to run. I also want to run the class with some parameters similar to the following example(its a Jini class server) and get the output from it in my java program. Is this possible?
java -classpath <<insert classpath>> -jar .\lib\tools.jar -port 8081 -dir .\lib -verbose
