can't start startup.bat from my application ?

[naved momin]

i was trying to execute tomcat's startup.bat file through my application
but when i use this

Process exec = null;
        String[] str = {""};
        String[] command = {"startup.bat"};
        try {
            exec = Runtime.getRuntime().exec(command,str,new File("C:\\tomcat\\bin\\startup.bat"));
        } catch (IOException ex) {
            Logger.getLogger(MYAnt.class.getName()).log(Level.SEVERE, null, ex);
        }
        ProcessInputTaker input = new ProcessInputTaker(exec.getInputStream()   , "Input" , serverpane);
        ProcessInputTaker error = new ProcessInputTaker(exec.getErrorStream()   , "Error",serverpane);
        input.start();
        error.start();
        try {
            exec.waitFor();
        } catch (InterruptedException ex) {
            Logger.getLogger(MYAnt.class.getName()).log(Level.SEVERE, null, ex);
        }

it throws an exception saying file not found , i had triple checked that everything is correct and file is present there because exception is IOException "File not found"

then i tried the same thing use Desktop class here the command prompt screen just splashes but nothing happens
the same script runs fine when i start it manually by double click
can you explain me whats wrong here ?

[Ireneusz Kordal]

Hello Naved,

try this code:

exec = Runtime.getRuntime().exec(command,str,new File("cmd.exe /cC:\\tomcat\\bin\\startup.bat"));  

bat file is not an executable file ( .exe or .com ) , the operating system cannot execute bat, bats can be only executed by the command interpreter.

[Joanne Neal]

naved momin wrote:

Runtime.getRuntime().exec(command,str,new File("C:\\tomcat\\bin\\startup.bat"));

can you explain me whats wrong here ?

Read the Javadoc for the Runtime.exec() method that you are using and see what each of the parameters represents.

[naved momin]

Ireneusz Kordal wrote:Hello Naved,

try this code:

exec = Runtime.getRuntime().exec(command,str,new File("cmd.exe /cC:\\tomcat\\bin\\startup.bat"));  

bat file is not an executable file ( .exe or .com ) , the operating system cannot execute bat, bats can be only executed by the command interpreter.

i have read the docs
but still this is also not working ,

String[] command = {"cmd","/C:Users/Admin/Desktop/startup.bat"};
        try {
            exec = Runtime.getRuntime().exec( command );
        } catch (IOException ex) {
            Logger.getLogger(MYAnt.class.getName()).log(Level.SEVERE, null, ex);
        }

now what should be wrong

[Joanne Neal]

naved momin wrote:now what should be wrong

You haven't done any research on what the cmd command does and what parameters can be passed to it.

Get that working in a normal command prompt (forget about Java for the moment) and only then should you try and run it from a Java program.
The first thing you should do is type
cmd /?
in your command prompt which will give you a description of how it works.

[Charles Hargrave]

naved momin wrote:
but still this is also not working ,

String[] command = {"cmd","/C:Users/Admin/Desktop/startup.bat"};
        try {
            exec = Runtime.getRuntime().exec( command );
        } catch (IOException ex) {
            Logger.getLogger(MYAnt.class.getName()).log(Level.SEVERE, null, ex);
        }

now what should be wrong

I have to agree with Joanne; you need to look at the 'cmd.exe' options.

You have 2 basic typos going on here. When you try to execute programs on any operating system through Java, you NEED to specify the complete file name (including the extension --> cmd.exe).

The other problem is your second argument in the array. It has a slash at the start. Based on previous replies above, it seems you're being recommended to give the 'cmd.exe' program to have a '/C' option, THEN the path to the .bat file. Basically, 3 arguments but you're giving it 2 and those have typos in them.

String[] command = {"cmd.exe", "/C", "C:/Users/Admin/Desktop/startup.bat"};

On Windows, if you get a return code 2 (for missing file), you'll need to fix the path to the file.

CNH

[naved momin]

Charles Hargrave wrote:

naved momin wrote:
but still this is also not working ,

String[] command = {"cmd","/C:Users/Admin/Desktop/startup.bat"};
        try {
            exec = Runtime.getRuntime().exec( command );
        } catch (IOException ex) {
            Logger.getLogger(MYAnt.class.getName()).log(Level.SEVERE, null, ex);
        }

now what should be wrong

I have to agree with Joanne; you need to look at the 'cmd.exe' options.

You have 2 basic typos going on here. When you try to execute programs on any operating system through Java, you NEED to specify the complete file name (including the extension --> cmd.exe).

The other problem is your second argument in the array. It has a slash at the start. Based on previous replies above, it seems you're being recommended to give the 'cmd.exe' program to have a '/C' option, THEN the path to the .bat file. Basically, 3 arguments but you're giving it 2 and those have typos in them.

String[] command = {"cmd.exe", "/C", "C:/Users/Admin/Desktop/startup.bat"};

On Windows, if you get a return code 2 (for missing file), you'll need to fix the path to the file.

CNH

thanks it helps a lot ....