Get exit code from a java application in batch file - java

I'm currently making an effort to create test cases for one of our java applications.
In my code, my java application calls a batch file, which in turn starts a separate java process, that returns an error code that I need to consume from the calling java application.
I'm doing the following to invoke my batch file:
Process process = runTime.exec(new String[]{"cmd.exe","/c",scriptPath});
exitValue = process.waitFor();
The batch file is as follows:
#echo off
cd %~dp0
java -cp frames.FrameDriver
SET exitcode=%errorlevel%
exit /B %exitcode%
Now with the above code and batch file, my JUnit framework just hangs on this particular test case, as if it's waiting for it to end. Now when JUnit is hanging on the test case, going to the Task Manager, and ending the java.exe process would allow the JUnit framework to continue with the other cases.
Running the .bat file by double clicking it runs the Java application normally.
Adding the START batch command before the java command in my batch file seems to fix the hanging problem, but I can't seem to get the correct exit code from my Java application as it's always 0. (The Java application exits with an error code using System.exit(INTEGER_VALUE)). I'm assuming that the %errorlevel% value is being overwritten by the "start" command's own exit value.
Can anyone please tell me how to solve this problem?
Thanks.
P.S: If it makes any difference, I'm using JDK 5 and Netbeans 5.5.1.

Don't use the /B on your exit. Here is how I would do a script:
#ECHO off
ECHO Running %~nx0 in %~dp0
CALL :myfunction World
java.exe -cp frames.FrameDriver
IF NOT ERRORLEVEL 0 (
SET exitcode=1
) ELSE (
SET exitcode=0
)
GOTO :END
:myfunction
ECHO Hello %~1
EXIT /B 0
:END
EXIT %exitcode%
NOTE: Also, you can execute java program in 3 different ways:
java.exe -cp frames.FrameDriver
CALL java.exe -cp frames.FrameDriver
cmd.exe /c java.exe -cp frames.FrameDriver
This is very critical since, your Java command may exit with a exit code and in order to pass the exit code correctly to the ERRORLEVEL var, you need to use the correct method above, which I am unsure about.

Related

Start a Java application using Bat file if not already started

I want to check using a bat file if a Java program is already running. If its not running then start it using start javaw.
I have tried WMIC and I am only successful so far to get the PID.
WMIC process where "CommandLine like '%MyServer.jar%' and Name like '%javaw%'" get ProcessId
But how to write an if else condition in the bat file to start?
I tried using tasklist and find
tasklist /FI "IMAGENAME eq myapp.exe" 2>NUL | find /I /N "myapp.exe">NUL
if "%ERRORLEVEL%"=="0" echo Programm is running
But for all the java applications myapp.exe will be java.exe.
Please help...
P.S: There are options for this to be done via the Java program itself, but my specific situation asks for a bat file solution.
You can use jcmd.exe to see the main class of all the java processes running. The IF-ELSE syntax of the batch file is explained in the following thread
How to use if - else structure in a batch file?
jcmd | find /I /N "sun.tools.jconsole.JConsole"
IF "%ERRORLEVEL%" GTR "0" (
jconsole.exe
)
IF %ERRORLEVEL% EQU 0 (
echo Programm is running
)
This link would help with the IF construct - http://ss64.com/nt/if.html

Running a batch from Java where the cmd prompt goes away

I was able to use an amalgamation of SO questions to get a line of code that would:
Run a batch file from within a Java application
Include an argument located in the same directory as the batch file
The argument & batch file are in a directory unrelated to the JAR/java app
So I used this:
Runtime.getRuntime().exec("cmd /c start batchfile.bat argument.js", null, new File( path ));
This works well except that it leaves the cmd prompt open after it has finished executing the batch file. I've looked around and it seems like having the /c flag should make it close after running, but for me it has been staying open. I tried removing 'start' but this meant that the cmd prompt never opened up at all.
Is it because I'm combining having an argument and using a different path that it's not causing the cmd prompt to open and then close after completion like most examples on SO?
Calling both cmd.exe and start in that order is creating a separate window but it doesn't seem like the command shell is terminating based on what you described. I was able to replicate this behavior in a simple batch script. If you want to leave your Java call as it is, check to make sure your batch script includes an exit statement. Preferably exit based on a success or failure condition within your batch script (i.e.: exit 0 or exit 1, etc...)
:: batchfile.bat
...
exit 0
Assuming you are not firing up any new shells within your batch script or prompting for input, adding an explicit exit to your existing batch script should cause the window to close. You can also try to leave your batch script as is, and as others have suggested in comments, change the order of your command text slightly.
Use this instead
start cmd.exe /c ...
Where you call start first and then call cmd.exe /c after followed by your parameters as needed. I tried both options here and either worked fine to cause the batch window to close as expected.
Pass the below command to Runtime to execute.
taskkill /F /IM (processName)
Runtime.getRuntime().exec("taskkill /F /IM "+pProcessName);

open 2 jar files on linux command

I need to open run two jar applications in the same time
I know that to run a jar file you have to type
java -jar app1.jar
but I need to terminate the current process to run
java -jar app2.jar
How can I open app2 without closing app1 ?
Execute this bash command
( java -jar app1.jar ) &
( java -jar app2.jar )
The commands will execute in parallel subshells
You can run one, push it into the background, and then run the other.
Run the first command, press ctrl-z and then type bg.
This runs the command in the background, leaving your command line available for you to call you next command.
http://www.thegeekstuff.com/2010/05/unix-background-job/

pausing a batch file while waiting for java to finish

I need to run a two java programs from a batch script. I need to wait for the first java program to finish running before the second one starts. Is there a way to do this? I'm on a windows machine and I can't edit the java programs so I'm using a batch script to launch them.
So it would be something like this
cd %PARSEDIR%
set CLASSPATH=.\lib\jpcap-0.01.16.jar
set CLASSPATH=%CLASSPATH%;.\lib\jpcap.jar
START /WAIT java -Xms768m -Xmx768m -classpath %CLASSPATH% parser.test.firstStage %2
timeout 5
START /WAIT java -Xms768m -Xmx768m -classpath %CLASSPATH% parser.test.lastStage %2
I need the first program to finish before the the batch script moves on. How do I accomplish this?
Thanks!
edit: added what the code currently looks like
Use the start /WAIT command (http://ss64.com/nt/start.html)

Running a batch file from java

I just downloaded MCP to see how things work behind the scenes in Minecraft.
Inside MCP there are a bunch of batch files that you use to do things like: decompile, recompile, startclient, etc.
What I would like to be able to do is run these batch files from a basic java gui.
I'm good with the gui part but I havent got a clue how to run those batch files.
Here is an example of one of the batch files:
The file is at:
C:\MCP\startclient.bat
startclient contains the following:
#echo off
:try_python
set PYTHON=python
%PYTHON% --version >NUL 2>NUL
if errorlevel 1 goto try_python_mcp
goto foundit
:try_python_mcp
set PYTHON=runtime\bin\python\python_mcp
%PYTHON% --version >NUL 2>NUL
if errorlevel 1 (
echo Unable to locate python.
pause
exit /b
)
:foundit
%PYTHON% runtime\startclient.py conf\mcp.cfg
pause
Can it be done?
You can easily run a batch file from java using Runtime:
Process p = Runtime.getRuntime().exec("cmd /c start " + yourbatchFileName);
you can also grab I/O of the process, using p.getOutputStream(), p.getInputStream() etc.
See more about the Process class here.
And I suggest you take a look at this article as well.

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