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Top Forums Shell Programming and Scripting Invoke java program in script Post 302069604 by mpang_ on Monday 27th of March 2006 09:05:31 PM
Old 03-27-2006
Invoke java program in script

Hey all,

My boss tasked me with the job to write a script which would invoke various java programs, the thing is I don't know much about shell scripting so would you experts help me out?

Here is the requirement
- 2 applications written in java: App_A and App_B
- App_A will accept a set of parameters and different action will be
taken depending on the paramters
i.e) ./java App_A Apple and ./java App_A Orange => different results
- App_A can be ran simultaneously with different parameters
i.e) ./java App_A Apple and ./java App_A Orange => run at same time
- App_B must be executed after all instances of App_A are finished

App_A required an input file which would be ftp to our server, so App_A is given a timeframe of one hour to check if the file exists before continue to invoke the program. If within the given timeframe, no file arrived then that instance of App_A would not be invoked.

What I need to do is to write a shell script which would invoke 3 instances of App_A, at least one instance of App_A need to be invoked in order for App_B to be called.

So here is the conclusion
1) all 3 instances of App_A are invoked (files found), so App_B is then called
2) all 3 instances of App_A are not invoked (waited for an hour and still no file found), so App_B won't be invoked instead an error is writen to log file
3) at least 1 instances of App_A is called, App_B is then invoked also an error message is logged.

I hope I explain myself clearly and please all you experts shine some light on me. Thanks! Sample codes would be GREATLY appreciated!!!!
 

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java-functions(7)						RPM Java packaging						 java-functions(7)

NAME
java-functions - Functions library for Java applications. Written for the JPackage Project <http://www.jpackage.org/>: SYNOPSIS
set_jvm() Set the java virtual machine. Use a JAVA_HOME if defined, or try to find it from java command set_classpath() Set the classpath - this functions requires a valid JAVA_HOME, JAVACMD, and JAVA_LIBDIR. JARs could be specified as an argument, or via ADDITIONAL_JARS variable. set_javacmd() set the JAVACMD variable. Options should be passed via JAVACMD_OPTS variable. set_flags() set FLAGS variable. They could be specified as an argument, or via ADDITIONAL_FLAGS variable. set_options() set OPTIONS variable. They could be specified as an argument, or via ADDITIONAL_OPTIONS variable. run() run the application. It executed a following command. If VERBOSE is defined, then it prints the command to stdout. exec $JAVACMD $FLAGS -classpath $CLASSPATH $OPTIONS $MAIN_CLASS "$@" set_jvm_dirs() set JVM-related directories (JVM_LIBDIR, JAVA_VERSION, JAVAVER_LIBDIR and JAVAVER_JNIDIR variables). Requires a correct JAVA_LIBDIR, JAVA_HOME and JAVA_CMD. link_jar_repository() links a jar repository. Options could be found in build-jar-repository(1) find_jar() finds a specific extention (jar or directory). Requires a correct JAVA_LIBDIR, JAVAVER_LIBDIR and JVM_LIBDIR. Used by find-jar(1) com- mand. do_find_jar() core routine used by find_jar() check_java_env() checks java environment - the JAVA_HOME, JAVACMD, JAVA_LIBDIR, JNI_LIBDIR variables. DESCRIPTION
This is a library of generic shell functions which should be used on jpackage.org compatible distributions. FILES
/use/share/java-utils/java-functions shell script functions library for Java applications /etc/java/java.conf system-wide Java configuration file ~/.java/java.conf user's Java configuration SEE ALSO
Regular Manual Pages build-jar-repository(1) find-jar(1) java.conf(5) jpackage-utils(7) AUTHORS
Guillaume Rousse <guillomovitch@sourceforge.net> Ville Skytta <scop at jpackage.org> David Walluck <david@jpackage.org> Nicolas Mailhot <Nicolas.Mailhot at laPoste.net> REPORTING BUGS
Report bugs using JPackage Bugzilla (http://www.jpackage.org/bugzilla/) jpackage-utils 1.7.5 February 2009 java-functions(7)
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