Regular cronjob calls Java program, cronjob calls java

Regular cronjob calls Java program, cronjob calls java

A Java Enterprise application background deployed in a linux environment often runs many scheduled tasks in the middle of the night. This article summarizes how to use shell scripts to call Java programs for memo.

1. setupenv. sh

export APP_HOME=`pwd`if [ -z "$JAVA_HOME" ] ; then  JAVA=`which java`  if [ -z "$JAVA" ] ; then    echo "Cannot find JAVA. Please set your PATH."    exit 1  fi  JAVA_BIN=`dirname $JAVA`  JAVA_HOME=$JAVA_BIN/..fiPATH_SEPARATOR=':'if [ $OSTYPE = "cygwin32" ] ; then   PATH_SEPARATOR=';'fiif [ $OSTYPE = "cygwin" ] ; then   PATH_SEPARATOR=';'fiJAVA=$JAVA_HOME/bin/javaCLASSPATH=$JAVA_HOME/lib/tools.jarCLASSPATH=`echo ${APP_HOME}/lib/*.jar | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}CLASSPATH=`echo ${APP_HOME}/lib/*.zip | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}CLASSPATH=`echo ${ANT_HOME}/lib/*.jar | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}CLASSPATH=`echo ${ANT_HOME}/lib/*.zip | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}CLASSPATH=${APP_HOME}/build/classes${PATH_SEPARATOR}${CLASSPATH}export CLASSPATH### load other variables from profilesource /etc/profile #set all env

2. app. sh

#!/bin/sh# -----------------------------------------------------------------------------# app.sh - Script to run applications## Environment Variable Prequisites##   APP_HOME (Optional) May point at your APP "build" directory.#                 If not present, the current working directory is assumed.#   APP_OPTS (Optional) Java runtime options used when the "start",#                 "stop", or "run" command is executed.#   JAVA_HOME     Must point at your Java Development Kit installation.# -----------------------------------------------------------------------------# ----- Checking JVM variables -------------------------export JAVA_PARAM=$1if [ "$JAVA_PARAM" = "-javaMax" ]then    shift    export memoryX=$1    shiftelse    export memoryX="1024"fiexport JAVA_PARAM=$1if [ "$JAVA_PARAM" = "-jmxHost" ]then    shift    jmxHost=$1    shiftfiexport JAVA_PARAM=$1if [ "$JAVA_PARAM" = "-jmxPort" ]then    shift    jmxPort=$1    shiftfi# fix env. issuessource /etc/profile# ----- Verify and Set Required Environment Variables -------------------------export LANG="en_US.UTF8"    if [ -z "$APP_HOME" ] ; then    ## resolve links - $0 may be a link to  home    PRG=$0    progname=`basename $0`    while [ -h "$PRG" ] ; dols=`ls -ld "$PRG"`link=`expr "$ls" : '.*-> \(.*\)$'`    if expr "$link" : '.*/.*' > /dev/null; then    PRG="$link"else    PRG="`dirname $PRG`/$link"fi    done        APP_HOME_1=`dirname "$PRG"`/../..    echo "Guessing APP_HOME from app.sh to ${APP_HOME_1}"     if [ -d ${APP_HOME_1}/properties ] ; then     APP_HOME=${APP_HOME_1}    echo "Setting APP_HOME to $APP_HOME"fi    fi    if [ -z "$APP_OPTS" ] ; then    APP_OPTS=""    fi    if [ -z "$JPDA_OPTS" ] ; then    JPDA_OPTS="-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n"    fi    if [ -z "$JAVA_HOME" ] ; thenecho You must set JAVA_HOME to point at your Java Development Kit installation    exit 1fi# ----- Cygwin Unix Paths Setup -----------------------------------------------# Cygwin support.  $cygwin _must_ be set to either true or false.case "`uname`" in  CYGWIN*) cygwin=true ;;  *) cygwin=false ;;esac # For Cygwin, ensure paths are in UNIX format before anything is touchedif $cygwin ; then  [ -n "$APP_HOME" ] &&    APP_HOME=`cygpath --unix "$APP_HOME"`    [ -n "$JAVA_HOME" ] &&    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`fi# ----- Set Up The Classpath -------------------------------------------CP=${APP_HOME}/build/classesCP=`echo ${APP_HOME}/lib/*.jar | tr ' ' :`:${CP}CP=`echo ${APP_HOME}/lib/*.zip | tr ' ' :`:${CP}if [ -f "$JAVA_HOME/lib/tools.jar" ] ; then  CP=$CP:"$JAVA_HOME/lib/tools.jar"fi# ----- Cygwin Windows Paths Setup --------------------------------------------# convert the existing path to windowsif $cygwin ; then   CP=`cygpath --path --windows "$CP"`   APP_HOME=`cygpath --path --windows "$APP_HOME"`   JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`fi# ----- Execute The Requested Command -----------------------------------------echo "Using CLASSPATH:     $CP"echo "Using APP_HOME: $APP_HOME"echo "Using JAVA_HOME:     $JAVA_HOME"JMX_OPTS=""if [ "$jmxHost" != "" ]then    JMX_OPTS=" -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote -Djava.rmi.server.hostname="$jmxHostfiif [ "$jmxPort" != "" ]then    JMX_OPTS=$JMX_OPTS" -Dcom.sun.management.jmxremote.port="$jmxPortfiexport JAVA_OPTS="-verbosegc -XX:+PrintGCDetails -XX:+PrintTenuringDistribution"JAVA_OPTS=$JAVA_OPTS" "-server" "-Xms256M" "-Xmx$memoryX"M "-XX:NewSize=128m" "-XX:MaxNewSize=128m" "-XX:+UseConcMarkSweepGC" "-Xconcurrentio" "-Xnoclassgc"" JAVA_OPTS=$JAVA_OPTS" "$JMX_OPTSJAVA_OPTS=$JAVA_OPTS" "-Doracle.jdbc.V8Compatible=true$JAVA_HOME/bin/java ${JAVA_OPTS} $APP_OPTS -classpath $CP -Dapp.base=$APP_BASE  -Dapp.home=$APP_HOME -Djava.library.path=$HOME/JMagick/lib $@

3. runMyJob. sh

#!/bin/sh#=============================================================================# Desc   : MyJob# 00 03 * * * /home/app/src/scripts/runMyJob.sh 0 >> /home/app/runMyJob0.log 2>&1#=============================================================================export APP_HOME=$HOME/appcd $HOME. .bashrccd $APP_HOME. setupenv.shLOCKFILE="$HOME/MyJob$1.lock";CONCURRENT_WARNING="MyJob lock file found: $LOCKFILE \n Probably a previous job is still executing, please wait for a while and try again later. \n";init_day=`date +%Y%m%d%H%M`;logfile="$HOME/MyJob$1_$init_day.log";if [ -f $LOCKFILE ]then    echo "$CONCURRENT_WARNING";    exit 1;fi#create a lock file to prevent concurrent job requeststouch $LOCKFILEecho ">>>>>START at `date`"echo ">>> execute the business ...."$APP_HOME/src/scripts/app.sh -javaMax 2049 com.zdp.MyJob $1 >> $logfile 2>&1echo ">>> $1 ....  "#gzip log filegzip $logfile;#move the log to the logs directorycd $HOMEmv $logfile.gz $HOME/logs/# remove lock filerm -rf $LOCKFILEecho ">>>>> END at `date`"

4. Java program: MyJob. java

package com.zdp;public class MyJob {    private static String MODE = "0";public static void main(String args[]) throws Exception {try {System.out.println("----------------- START -----------------");long begin = System.currentTimeMillis();if (args.length > 0) {MODE = args[0];}// main logiclong end = System.currentTimeMillis();System.out.println("<<<<<<<<<<<<<<<<<<<<  Total spent time: " + (end - begin) / 1000 + "s  >>>>>>>>>>>>>>>>>>>>");System.out.println("----------------- END -------------------");} catch (Exception e) {logger.error(e.getMessage(), e); System.exit(1);} finally{System.exit(0);}}}