Catch Java Error Shell Script
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Bash Catch Java Exception
a minute: Sign up shell script exception from java [duplicate] up vote -1 down vote favorite This question already has an answer here: to run shell script through java 3 answers I am trying Spring batch job that run from shell script sh file. The following is my code. I want to catch shell script exception or error from java code. execute shell script from java String file = "script.sh"; File shellScriptFile= new File(file); Runtime run = Runtime.getRuntime(); ProcessBuilder processBuilder = new ProcessBuilder(shellScriptFile.getAbsolutePath(), "Argument-ONE" , "Argument-TWO"); Process process = processBuilder.start(); Thank you very much. java shell share|improve this question asked Apr 9 '14 at 10:29 T8Z 467312 marked as duplicate by hmjd, Jayan, Jonathan Leffler, Appleman1234, Blazemonger Apr 9 '14 at 19:09 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 3 Answers 3 active oldest votes up vote 1 down vote accepted You can use Apache commons exec library for this. Example : package testShellScript; import java.io.IOException; import org.apache.commons.exec.CommandLine; import org.apache.commons.exec.DefaultExecutor; import org.apache.commons.exec.ExecuteException; public class TestScript { int iExitValue; String sCommandString; public void runScript(String command){ sCommandString = command; CommandLine oCmdLine = CommandLine.parse(sCommandString); DefaultExecutor oDefaultExecutor = new DefaultExecutor(); oDefaultExecutor.setExitValue(0); try { iExitValue = oDefaultExecutor.execute(oCmdLine); } catch (ExecuteException e) { // TODO Auto-generated catch block System.err.println("Execution failed."); e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block System.err.println("permission denied."); e.printStackTrace(); } } public static void main(String args[]){ TestScri
and Signals and Traps (Oh My!) - Part 1 by William Shotts, Jr. In this lesson, we're going to look at handling errors during the execution of your scripts. The difference between a good execute shell script from java example program and a poor one is often measured in terms of the program's robustness.
Execute Shell Script From Java Remotely
That is, the program's ability to handle situations in which something goes wrong. Exit status As you recall from previous
Run Shell Script From Java
lessons, every well-written program returns an exit status when it finishes. If a program finishes successfully, the exit status will be zero. If the exit status is anything other than zero, then the http://stackoverflow.com/questions/22959812/shell-script-exception-from-java program failed in some way. It is very important to check the exit status of programs you call in your scripts. It is also important that your scripts return a meaningful exit status when they finish. I once had a Unix system administrator who wrote a script for a production system containing the following 2 lines of code: # Example of a really bad idea cd http://linuxcommand.org/wss0150.php $some_directory rm * Why is this such a bad way of doing it? It's not, if nothing goes wrong. The two lines change the working directory to the name contained in $some_directory and delete the files in that directory. That's the intended behavior. But what happens if the directory named in $some_directory doesn't exist? In that case, the cd command will fail and the script executes the rm command on the current working directory. Not the intended behavior! By the way, my hapless system administrator's script suffered this very failure and it destroyed a large portion of an important production system. Don't let this happen to you! The problem with the script was that it did not check the exit status of the cd command before proceeding with the rm command. Checking the exit status There are several ways you can get and respond to the exit status of a program. First, you can examine the contents of the $? environment variable. $? will contain the exit status of the last command executed. You can see this work with the following: [me] $ true; echo $? 0 [me] $ false; echo $? 1 The true and false
Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help https://www.experts-exchange.com/questions/26551369/How-do-I-capture-Java-exceptions-at-a-Linux-shell-command-line.html Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > How do I capture Java exceptions at a Linux shell command http://askubuntu.com/questions/153641/attempting-to-grep-details-of-a-java-error line? Want to Advertise Here? Solved How do I capture Java exceptions at a Linux shell command line? Posted on 2010-10-18 Programming Java Shell Scripting 1 Verified Solution 16 Comments 1,883 Views Last Modified: 2013-11-13 shell script I have a cron job on Linux running a Java process. This process is creating threads. I want to capture any Java exceptions at the shell so I can send out an email alert. How do I capture these Java exceptions at a Linux shell command line? 0 Question by:pmsguy Facebook Twitter LinkedIn Google LVL 10 Best Solution byHegemon No, only System.exit() guarantees the killing of all threads. If all threads are shell script from daemon threads and the main process exits, the daemon threads will exit as well. Non-daemon ones will stay. Whether Go to Solution 16 Comments LVL 5 Overall: Level 5 Java 1 Shell Scripting 1 Message Expert Comment by:jcott282010-10-18 The cronjob, when started, would need to pipe out stdout to a file. Just redirect it into a file: java -jar foo.jar > output.txt Or, you could implement some sort of logging inside of the java app. Look up log4j and see about implementing that. 0 Message Author Comment by:pmsguy2010-10-18 I want to capture the signal generated by the Java exception. My shell script calls the program foo # Call the java program foo java foo If foo has a Java exception I want to capture this error during the execution of the program and have foo abort Note: foo creates threads also, how do I capture exceptions in threads and have them abort to the shell? 0 LVL 10 Overall: Level 10 Java 7 Programming 1 Message Expert Comment by:Hegemon2010-10-18 It depends on how the application itself manages the exception. It can handle, swallow, log or crash and exit.. In the first two cases you cannot know about the exceptions from the shell script. If the application exits, the script
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Attempting to GREP details of a Java error up vote 0 down vote favorite 1 I'm running Ubuntu 11 and I'm having some issues with grep. I have a shell script (see below) which essentially checks if a certain Java program of mine is running, if not it runs it. That part works out great! If my Java application throws any kind of exception however I would like to capture that information and email it to myself. How can I go about checking to see if the call to java -jar /bin/MyApp.jar fails? I tried piping it to grep, but that doesn't seem to work. Below is the full script that I've written: #Check if MyApp.jar is running, if not run it. if [ $(ps aux | grep 'java' | grep -v grep | wc -l | tr -s "\n") -eq 0 ] then echo "PacketCapture Starting...\n" java -jar /bin/MyApp.jar echo "PacketCapture Started.\n" else echo "PacketCapture already running.\n" fi bash java scripts grep share|improve this question asked Jun 20 '12 at 14:49 BOMEz 8519 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted You have to redirect the output of stderror stream to stdout stream since exceptions are logged in stderr stream. The below snippet can filter the exception strace and prints upto 10 following lines. $ java -jar /bin/MyApp.jar 2>&1 | grep "^Exception" -A10 Note: You can use jps command to find the java process for sun JVM. You can also try pidof or pgrep commands or grep '[j]ava'(this one will not list its(grep) process) too. share|improve this answer edited Jun 20 '12 at 16:06 answered Jun 20 '12 at 15:59 Prince John Wesley 1,67311112 This works! Much thanks. Can you however explain 2>&1 does or direct me to some reading on it? I'd hate to just use this and have no idea what it's really doing –BOMEz Jun 20 '12 at 18:59 1 @BOMEz, try t