Solved

Runtime.execute("Some batch file")

Posted on 2004-09-01
4
549 Views
Last Modified: 2007-12-19
To conform with Sarbanes-Oxley, I am writing a Java program that will allow a user to login to an intranet site and request a password for an "Emergeny login Profile" on an AS400.

My code verifies that the user is authorized to access this profile and then changes the password for that profile and divulges it to the user.

I am having problems when executing the call that changes the password.

//code snippet (in a servlet)
...
...
...
    // generate a random 10 charcter password (first must be alphabetic, rest are alphameric)
    profile.switchPassword(userBean.getUserName(), Integer.parseInt(duration), reason);
 
    // Now actually switch it on the AS400
    Runtime run = Runtime.getRuntime();
    String[] commandLine = {"C:\\WINNT\\rmtcmd.exe","chgusrprf", profile.getProfileName(), profile.getPassword()};

    Process proc = run.exec(commandLine);
           
    int exitCode = proc.waitFor();
    if (exitCode != 0){
        throw new Exception("Error changing password on AS/400. Error Code: " + exitCode);
    }
...
...
...

--Batch file contents..
RMTCMD chgusrprf %1 %2
-- End of Batch File Contents


I have the connection properties set up in AS400 Operations to use a default user and prompt for password when necessary.
I have the same user set up on the windows server with the same password.

When I execute the commandline from either the RUN prompt in window, or in a DOS environment, it works fine.
When called via the java code, the password gets changed successfully, but the code seems to hang at the call to proc.waitFor().

After reading the documentation,it is my understanding that the servlet thread waits until the call to the batch file finishes.  The batch file obviously finished because the password got changed.

I need a way of knowing that the call "RMTCMD chgusrprf profilename password" was successful before I divulge the password to the user.

If more info is needed, please let me know.

Any help would be appreciated.

Thanks
0
Comment
Question by:beermequik
  • 2
4 Comments
 
LVL 35

Accepted Solution

by:
TimYates earned 250 total points
ID: 11953229
It is probably waiting for you to read some output form it...

class StreamGobbler extends Thread
{
    InputStream is;
    String type;

    StreamGobbler(InputStream is, String type)
    {
        this.is = is;
        this.type = type;
    }

    public void run()
    {
        try
        {
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line=null;
            while ( (line = br.readLine()) != null)
               System.out.println( type + ">" + line ) ;
            } catch (IOException ioe)
              {
                ioe.printStackTrace();
              }
    }
}

then:

    Process proc = run.exec(commandLine);
    StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
     // any output?
    StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");
    // kick them off
    errorGobbler.start();
    outputGobbler.start();
    // any error???
    int exitCode = proc.waitFor();
    if (exitCode != 0){
        throw new Exception("Error changing password on AS/400. Error Code: " + exitCode);
    }
0
 
LVL 13

Expert Comment

by:samic400
ID: 11953320
another possible idea is to create a CL with this command in it (CHGUSRPRF) passing in the necessary parms. After the statement has been executed, send back a return value to your program. Enter the CL as a stored procedure.

0
 
LVL 2

Author Comment

by:beermequik
ID: 11953472
That did it!  Thanks

I was trying to read the output streams at one time, but was unsuccessful (I never used Streams outside of files)
Thanks for the code snippet too.
0
 
LVL 35

Expert Comment

by:TimYates
ID: 11953496
Glad I could help :-)

Good luck with it!!

Tim
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
servlet doXXX methods 3 61
hibernate example for saving data 19 52
How do I remove an object from a 3 40
web project error add remove 1 27
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question