Catching System.Exit(value) in a unix script

I am migrating a java application from Windows to Unix, where on the Unix environment it will be run under a batch scheduler.
I am trying to figure out how to get Unix script 'visibility' to the contents of system.exit().
At program completion, system.exit is called with either a 0 (all's cool) or -1 (this dog won't hunt).
I cannot figure out how to get that value communicated back to the invoking script, which currently looks something like:
cp=<classpath>
rm -f /staging/*
$JAVA_HOME/bin/java ........
rc=$?
<if 'rc' = 0>
{ :perform this }
<if 'rc' = -1>
{ :perform this instead }
Any suggestions?

rc=$? suggests it's Bourne shell you're running the script with?
if [ $rc .eq. 0 ]; then
echo "Bingo!"
else
echo "Oh shit..."
fi
Better yet, do "man sh" from a unix command prompt -- it gives you the full scoop.

Similar Messages

Catching System.exit() or How to avoid System.exit() - Third Party Tool ???

Hi All,
I am using a third party tool which is internally calling System.exit sometimes and my application
got terminated most of the times.
It is happening always when i call a particular method of that third party tool.
Is there any way to catch or avoid the System.exit while using the particular method?
I need this urgently...Please kindly help.....
Thanks,
J.Kathir

There's a fair bit to it, and you should refer to the appropriate java Tutorials. Bascially you create a .policy file and install a sercurity manager with:
System.setSecurityManger(new SecurityManager());The policy file grants a set of permissions to various "code sources", basically each codesource is a classpath entry. You could grant "AllPermissions" to your own code, and a more restricted set of permissions to the application you're running. But you can't subtract permissions, i.e. you can't say "this code can do anything except call System.exit().
I doubt this is going to provide you with a good solution. It's tiresome to set up, and when the client app called System.exit it would crash, which might not result in a clean status.
I'd consider if you should be using this client app in the same JVM, rather than creating a subordinate JVM using Runtime.exec.

System.exit(VALUE) and Windows 98?

Has anyone got System.exit(integer) to return a value other than 0 under Windows 98?
Regardless of what integer I enter as an exit code, java.exe always seems to return 0. This does not seem to be the case under Windows NT, where the correct exit code is passed back.
Is anyone aware of this problem/found a workaround?

I found the same behaviour of Java between NT 4.0 SP 4 and Windows 98.
Are you sure you get the exit code right in the dos box?
%ERRORLEVEL% is NT specific, I think.
In normal DOS you can only ask e.g.:
if ERRORLEVEL 3 goto three
and this will jump to label
:three
if the exit code is >= 3 !!!
Test your program by this bat file:
java ...
if %errorlevel 6 goto x6
if %errorlevel 5 goto x5
if %errorlevel 4 goto x4
if %errorlevel 3 goto x3
if %errorlevel 2 goto x2
if %errorlevel 1 goto x1
goto x0
:x0
echo was: 0
goto end
:x1
echo was: 1
goto end
:x2
echo was: 2
goto end
:x3
echo was: 3
goto end
:x4
echo was: 4
goto end
:x5
echo was: 5
goto end
:x6
echo was: 6
goto end
:end
echo End.
You see:
7 or higher goes also to :x6

Using System.exit(0) in executeScript

When using System.exit(0) in executeScript within a process, it shuts down JBoss. This happens both
in LC ES2.5 and ADEP 10.0.1.20111108.1.309370
I would expect that System.exit(0) simply ends the script and returns control to the process. Am I
missing something here?
TIA,
Alex

gavas_java_nov26_exception wrote:
If i use System.exit(0) in the try block or catch block will finally block will be executed?
try
System.exit(0);
catch(Exception e){
System.exit(0);
finally
System.out.println("finally!");
To tell you the truth, What does it matter? You shouldn't be doing that anyway, at least not in a well written program.
But, if you really want to find out, do as duffymo said, and try it. It'll only take a minute and save you the time (and embarressment) of asking here.

Error while executing UNIX script from BODS - exit code 127

I am trying to execute a unix script by calling it in BODS job. It is giving an error saying Program terminated with exit code 127. The same script when i am executing in UNIX it is working fine. I am unable to trace the issue.

Hi Sabre,
As per the guidelines provided by the article, i had done below changes..
InputStream is = null;
InputStreamReader iStreamReader = null;
BufferedReader bReader = null;
String line = null;
try{
String fileName ="test.ksh";
String argValue ="satish"; // value passed to the script
String exeParam = "/usr/bin/ksh "+fileName+" "+argValue;
Process proc = Runtime.getRuntime().exec(exeParam);
is = proc.getErrorStream();
iStreamReader = new InputStreamReader(is);
bReader = new BufferedReader(iStreamReader);
System.out.println("<ERROR>");
while((line = bReader.readLine()) != null)
System.out.println("Error is : "+line);
System.out.println("</ERROR>");
int exitValue = proc.waitFor();
sop("Exit Value is : "+exitValue);
catch(Exception e)
e.printStackTrace();
Now , it's showing something like..
<ERROR>
</ERROR>

Getting an exit value from a program called thru a shell script

how do i get the correct exit value always from a program called thru a shell script
the getExitValue of the process works fine someitmes but not always ...
Ex: write a pgm which sleeps for 5 secs & returns with exit(100).try to invoke this thru a script & try to run this script from Runtime.getRuntime.exec(..)
...the exit value is not same as 100.(it works if the sleep is not given though !!)
can nebody help??

ive done that ...see the sample code for ex..
public void execute()
               try{
                         Process program=Runtime.getRuntime().exec(cmd);
                         printOutput(program.getInputStream());
                         try
                              program.waitFor();
                         catch(InterruptedException e)
                              System.out.println("Command Interrupted: " + e);
          System.out.println("Error status : "+program.exitValue());
                    catch(SecurityException e)
                         System.out.println("Error executing program "+e);
                    catch(IOException e)
                         System.out.println("Error executing program "+e);
....

How can I exit my UNIX script when my PLSQL script in it calls an error?

hello.
I hope someone can help with my error handling and exiting-in-the-right-place problem.
I have several PLSQL scripts that are called from a UNIX script to insert/update employee records in ORACLE Financials.
At the end of the UNIX script, depending on whether an entry has been created in the errors table should depend on whether the UNIX script stops or not. Trouble is, its stopping too early everytime even though the the record has been inserted correctly. Please can someone either advise on what I'm doing wrong or suggest an alternative..
This the end of the PLSQL script that inserts the entry into errors table if theres an error..
WHEN OTHERS    THEN       ROLLBACK;
      err_msg := SUBSTR (SQLERRM, 1, 350);
      insert into kpmg_error_check (concurrent_id,module,narrative,status,creation_date,created_by)
                            values(0,'TEMPLOYEE_DTLS.sql',err_msg,'ERROR',SYSDATE,'Feldman');
     commit; This is the end of the UNIX script that looks at the table..
echo " "
echo "**** `date +%H:%M:%S` - Checking if TEMPLOYEE_DTLS.sql ran OK"
error_check=`sqlplus -s $user_id @$SU_TOP/sql/SUTEMPCHK.sql 1`
if `echo $error_check` -ge 1
then
# Load failed
echo " "
echo "**** `date +%H:%M:%S` - TEMPLOYEE_DTLS has failed - check table KPMG_ERROR_CHECK for details.."
exit 1
else
# Load finished OK, if input data file exists, move and rename it
echo " "
echo "**** `date +%H:%M:%S` - TEMPLOYEE_DTLS has finished OK.."
fiThis is the entire SUTEMPCHK.sql script that the UNIX script uses..
-- Check if any errors have occurred
SELECT count(1) FROM kpmg_error_check WHERE concurrent_id = &1
EXITIs it that the above is always returning '1' and so always thinks theres an entry in the errors table?
Is there an easier way?
many thanks,
Steven

Hi,
You have to iterate through all pages.marginPreferences:
var
myDocument = app.activeDocument,
allPagesMaPref = myDocument.pages.everyItem().marginPreferences,
curPageMaPref;
while ( curPageMaPref = allPagesMaPref.pop() )
with (curPageMaPref) {
columnCount = 1;
//columnGutter can be a number or a measurement string.
columnGutter = "0";
bottom = "0"
//When document.documentPreferences.facingPages == true,
//"left" means inside; "right" means outside.
left = "40"
right = "0"
top = "0"
inside = "0"
Jarek

Problem in picking the system variable value in Calculation Script

Hi All,
We are using a Calculation Script to perform data export. And the target location where to crete the exported output file is given to the environment system variable.
Now I am using this system variable in the calculation script as below:
//ESS_LOCALE English_UnitedStates.Latin1@Binary
SET DATAEXPORTOPTIONS
DataExportLevel "ALL";
DataExportOverwriteFile ON;
Fix ( &CurrMiles, &CurrProj, &CurrVer,"No Project","No Version")
DATAEXPORT "File" " " $DEXPORTPATH;
ENDFIX
Here "DEXPORTPATH" is the system variable
I am creating this system variable from the batch script and the system variable value varies at the runtime.
This calculation script works fine for first time and it picks the correct value from the system variable.
But the problem occurs from next execution of calc script. Even if i update the system variable with other value, it picks only the last execution system variable value and it performs execution.
Eg: Suppose for first execution system variable value is "D:\Bkup\PMV.txt"
The calc script works fine with this.
For next execution, system variable value is changed to "D:\Time\temp.txt"
Now the calc script picks the system variable value as "D:\Bkup\PMV.txt"
and performs execution which is wrong.
Please help me on this issue how to handle system variables in calc scripts.
Thanks in advance
Regards
Swathi

811829 wrote:
Hi All,
We are using a Calculation Script to perform data export. And the target location where to crete the exported output file is given to the environment system variable.
Now I am using this system variable in the calculation script as below:
//ESS_LOCALE English_UnitedStates.Latin1@Binary
SET DATAEXPORTOPTIONS
DataExportLevel "ALL";
DataExportOverwriteFile ON;
Fix ( &CurrMiles, &CurrProj, &CurrVer,"No Project","No Version")
DATAEXPORT "File" " " $DEXPORTPATH;
ENDFIX
Here "DEXPORTPATH" is the system variable
I am creating this system variable from the batch script and the system variable value varies at the runtime.
This calculation script works fine for first time and it picks the correct value from the system variable.
But the problem occurs from next execution of calc script. Even if i update the system variable with other value, it picks only the last execution system variable value and it performs execution.
Eg: Suppose for first execution system variable value is "D:\Bkup\PMV.txt"
The calc script works fine with this.
For next execution, system variable value is changed to "D:\Time\temp.txt"
Now the calc script picks the system variable value as "D:\Bkup\PMV.txt"
and performs execution which is wrong.
Please help me on this issue how to handle system variables in calc scripts.
Thanks in advance
Regards
SwathiAs of my knowledge system variables will not update immediately...you need to log off the session after changing the value.
Update the system variable..
Log off from the session..
And Re-login with the same username ....and check...
Regards,
Prabhas

If i use System.exit(0) in the catch block will finally block executed

If i use System.exit(0) in the try block or catch block will finally block will be executed?
try
System.exit(0);
catch(Exception e){
System.exit(0);
finally
System.out.println("finally!");
}

gavas_java_nov26_exception wrote:
If i use System.exit(0) in the try block or catch block will finally block will be executed?
try
System.exit(0);
catch(Exception e){
System.exit(0);
finally
System.out.println("finally!");
To tell you the truth, What does it matter? You shouldn't be doing that anyway, at least not in a well written program.
But, if you really want to find out, do as duffymo said, and try it. It'll only take a minute and save you the time (and embarressment) of asking here.

Catch/Prevent System.exit call in other thread

Wasn't sure where to put this so apologies if this is in the wrong section.
I have an application that runs a particular method contained in a JAR that is written/provided by somebody else (they implement an interface I provide). They have complete free range as to what their application does. I then run this application in a separate thread, the idea being that when it completes my original application is still running.
What I have provided so far is ok PROVIDED that the given JAR does not perform a System.exit call which is very possible. I want to prevent them from doing this but I don't want to contacting the author asking them to remove all invokations of System.exit.
I found this article: https://www.securecoding.cert.org/confluence/display/java/EXC04-J.+Prevent+against+inadvertent+calls+to+System.exit%28%29+or+forced+shutdown and so I tried to create my own SecurityManager. Unfortunately though despite explicitly putting the running of the applicaiton in a catch block for AccessControlException it doesn't catch it and fails. Does anybody have an idea of how to overcome this.
In summary: how can I prevent a call to System.exit being invoked (or when it is invoked, catch it and prevent it from actually happening) inside another thread?

batterj2 wrote:
I was unable to do any File I/O afterwards which seems strange as its extending the original SecurityManager so I thought it wouldn't have any difference.No, that code isn't "extending the original SecurityManager". It's creating a SecurityManager which overrides some SecurityManager which may or may not be the same as the actual SecurityManager which was in place when you applied it. From what you say, it's not the same.
Remember you don't extend objects, you extend classes.
You could write something which gets a link to the current security manager, then delegates all calls to that security manager except the ones you don't want to delegate.

Executing unix script within java and getting the return value

Hi
I am executing a unix script from within java which will return me a value. Is there a way I get this value and use it inside my java code without doing this:
BufferedReader in = new BufferedReader( new InputStreamReader( ls_proc.getInputStream() ));
//readLine reads in one line of text
int k = 1, i = 0;
while (( ls_str = in.readLine()) != null)
--kirk123

I was hoping to get what I want in one or two line codes.
--kirk123

Running a Unix script from a Java class

I am trying to use SCP (Secure copy) to copy an xml file from my J2EE application to a remote Unix server using a Unix script. How can I run the Unix script from my Java class? I could not find any resource for this on the internet. Can someone help me with this please.
Thanks

I am trying this below program ,but i am getting the error please help me
import com.jcraft.jsch.*;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
//import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
//import com.jcraft.jsch.UserInfo;
import java.io.*;
public class testrad {
public static void main(String args[])
String user="usertvr";
String host="5.34.12.1";
String cmd="ls -l";
JSch jsch = new JSch();
try{
Session session=jsch.getSession(user,host,22);
session.setPassword("$yhaj23");
//UserInfo usrInfo=new MyUserInfo();
//session.setUserInfo(usrInfo);
session.connect();
Channel channel=session.openChannel("exec");
((ChannelExec) channel).setCommand(cmd);
channel.setXForwarding(true);
channel.connect();
//code
channel.setInputStream(System.in);
// channel.setOutputStream(System.out);
//((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
channel.connect();
byte[] tmp = new byte[1024];
while (true)
while (in.available() > 0)
int i = in.read(tmp, 0, 1024);
if (i < 0)
break;
System.out.print(new String(tmp, 0, i));
if (channel.isClosed())
in.close();
// System.out.println("JSCH: exit-status: " +
//channel.getExitStatus());
break;
try
Thread.sleep(1000);
catch (Exception ee)
channel.disconnect();
session.disconnect();
}catch(Exception e)
{e.printStackTrace();
System.out.println("Exception"+e);}
/*public static class MyUserInfo implements UserInfo {
public String getPassword()
{ return "password"; }
public String getPassphrase()
{ return ""; }
public boolean promptPassword(String arg0)
{ return true; }
public boolean promptPassphrase(String arg0)
{ return true; }
public boolean promptYesNo(String arg0)
{ return true; }
public void showMessage(String arg0)
Here is the error
com.jcraft.jsch.JSchException: UnknownHostKey: 5.128.0.10. RSA key fingerprint is 02:a0:d6:c0:6f:69:2c:a9:a7:fa:7c:71:1c:60:ed:57
     at com.jcraft.jsch.Session.checkHost(Unknown Source)
     at com.jcraft.jsch.Session.connect(Unknown Source)
     at com.jcraft.jsch.Session.connect(Unknown Source)
     at testrad.main(testrad.java:23)
Exceptioncom.jcraft.jsch.JSchException: UnknownHostKey: 5.128.0.10. RSA key fingerprint is 02:a0:d6:c0:6f:69:2c:a9:a7:fa:7c:71:1c:60:ed:57
Can some one help me please.
I running this program from Windows to connect to remote unix boxes.

How to invoke from UNIX script and pass back return code?

Though I am an experienced developer, I am new to java. I created a class containing a single method. I have performed my testing by running the class class.method from the command line in a UNIX (Solaris) environment. Now, I would like to have the class.method invoked from a UNIX shell script, and to return a success/failure indicator from the method, to the UNIX script. I modified the method to make it return char, rather than being defined as void. Within the class and method, I declared and initialized a char variable. I added a finally clause which contains a single return statement, returning the char return code variable. Within my UNIX script, I invoke the class/method as follows:
return_code = java myClass
This does not seem to be invoking the method however. Can someone please tell me what I am doing wrong? Or is more information needed in order for someone to help me out.
Please let me know.
Thanks.
Brad

stdunbar,
Using your suggestion of System.exit(retVal); seems to allow the java method to be performed successfully (Thank You). But I am still having a problem with the value being recognized by the shell script.
In my script, I'm doing the following:
java MyClass inputparameter > return_code
export return_code
echo $return_code
But return_code does not seem to contain a value. Just before the System.exit(retVal); I added System.out.println("return code = " + retVal ); and I can see that retVal. When I run the java method outside of the UNIX shell script, I can see that retVal does indeed contain a value. So I think my problem might actually be the code in the UNIX script.
Thanks again.
Brad

Running a Unix Script through a Java Program

Hi !!!!!!!!! Can anybody plz suggest me an approach for the following queries -
1. How to execute a unix script through a java program ?
2. How to send the o/p of the script to a java program so that it can be used .

import java.io.*;
public RunScript
   public static void main(String args[])
      try
          Process p = Runtime.getRuntime().exec("script.sh");
          BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
          while ((line = input.readLine()) != null)
             System.out.println(line);
          input.close();
      catch(Exception e)
          e.printStackTrace();

System.exit(0)   error in program.

Any help appreciated. Let me first put my code here:
Converts money using CurrencyConverter, there's another class I haven't posted here!! (which calculates conversion)
import java.util.* ;
public class CurrencyConverterTester
public static void main(String[] args)
    Scanner in = new Scanner(System.in) ;
    System.out.println("How many euros is one dollar?") ;
    String input = in.nextLine() ;
    double rate = Double.parseDouble(input) ;
    CurrencyConverter myconverter = new CurrencyConverter(rate);
    System.out.println("Dollar value (Q to quit)") ;
    input = in.nextLine() ;
    while (true) {
      if (input == "Q"){
        System.exit(0);
        break;}
      else {
      System.out.println(input + " dollar = " + myconverter.convert(Double.parseDouble(input)) + " euros");
      input = in.nextLine();
      continue;}
}The issue is that the program won't terminate when I enter Q as my input?? I'm guessing it might have something to do my conversion from string to double in the 'else' statement, but not sure. Also, if you can suggest a more simpler method for the last 'while' statement, that would be helpful as well. Thanks. (noob to java)

paulcw wrote:
Curse Gosling for making + syntactic sugar for string append, but not overloading any other operators.@Paul
What did you expect from a duck ;-)
Seriously, yep, maybe it would have been better for noobs if the syntax of Java Strings was consistent with other kinds of Object... or maybe it would have been better if == was compiler-magiced into stringA.equals(stringB)... and the left and right shift operators have promise, and of course that way lies MADNESS, as witnessed in C++ ;-)
@OP... You are (IMHO) using the break, continue and especially System.exit() inappropriately... see my comments in your code...
    System.out.println("Dollar value (Q to quit)") ;
    input = in.nextLine() ;
    // while-true-loops are a "fairly usual" way of doing this kind of stuff,
    // but that doesn't make them "the preferred option". Typically you would
    // explore more "vanilla approaches" (which don't rely on the break and
    // continue statements)... leaping straight to the "tricky approach" means
    // you haven't (most often out of sheer laziness) thought it through... and
    // ALL good computer programs are thoroughly thought through (yep, try
    // saying that three times fast, especially after three beers).
    while (true) {
      // You don't compare Strings using ==
      if ( "Q".equalsIgnoreCase(input) ) {
        // Either of the following statements will do the job. The call to exit
        // will exit the JVM, therfore the break statement cannot be reached,
        // so it is superflous, so it's presence is just a bit confusing. Having
        // said that, "real programmers" don't use System.exe routinely, only in
        // the case of an emergency, such as handling a fatal-error, such as an
        // out-of-memory condition... an even then it's usually indicative of a
        // poor "system design", because it terminates the JVM which is running
        // this program without giving anything else in the program a chance to
        // clean-up after itself... like ask the user if they want to save there
        // work, or whatever.
        // I would use break (if anything) instead of System.exit
        // ... and if I wrote the Java tutorials, exit wouldn't be mentioned at
        // all until both "normal" flow control, and exception handling had both
        // been thoroughly covered.
        System.exit(0);
        break;
      } else {
        // I would break this line up, probably into three lines, simply becuase
        // it's syntatically "a long line".
        // Also the name "myconverter" doesn't tell what the class is/does.
        // IMHO, currencyConverter would be a better (more meaningful) name.
        // HERE'S HOW I WOULD WRITE IT
        // double dollars = Double.parseDouble(input);
        // double euros = currencyConverter.convert(dollars);
        // System.out.println(input + " dollar = " + euros + " euros");
        System.out.println(input + " dollar = " + myconverter.convert(Double.parseDouble(input)) + " euros");
        input = in.nextLine();
        // This continue statement is superflous. continue says "go back to the
        // top of loop, reevaluate the loop-condition (true in this case) and
        // (if the condition is still true) "Play it again Sam".
        // ... which is exactly what will happen without this continue statement
        // and hence (IMHO) your code is easier to follow without it, simply
        // because another programmer may waste there time trying to figure out
        // WHY that continue statement is present.
        continue;
    }*ALSO:* The format of that code totally sucks. Braces all over the place; improper indentation. No wonder you're struggling to read your own code. Please read and abide the [The Java Code Conventions|http://java.sun.com/docs/codeconv/] (at least until you have the requisite experience to formulate credible and compelling arguments as to why your "style" is superior to the standard, and that's no small ask). Yes this is *important*... trust me on this (for now)... especially if you are going to ask for help on the forums... You're effectively wasting our time asking us to decipher your code because you are too lasy to format it correctly... and I for one find that "self entitled" attitude ugly, and offensive... Help us help you... you know?
And BTW.... Here's how I would actually do it.... no funky while-true, break, or continue... just a plain-ole'-while-woop....
package forums;
import java.util.Scanner;
public class KRC
private static final Scanner SCANNER = new Scanner(System.in);
public static void main(String[] args) {
    try {
      String input = null;
      while ( !"Q".equalsIgnoreCase(input=enterDollarAmount()) ) {
        System.out.println(input + " dollars is " + Double.parseDouble(input) + " euros.");
        System.out.println();
    } catch (Exception e) {
      e.printStackTrace();
private static String enterDollarAmount() {
    System.out.print("Please enter an amount in dollars : ");
    return SCANNER.nextLine();
}Edited by: corlettk on 25/10/2009 10:21 ~~ Distant Monarching Forum Markup!

Catching System.Exit(value) in a unix script

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