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Java hangs even though shell script’s execution is completed

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Top Forums Shell Programming and Scripting Java hangs even though shell script’s execution is completed
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Old 08-14-2010
Error Java hangs even though shell script’s execution is completed
I'm trying to execute a script from within my java code. The execution of the script is over(it's pid is no more), but java is stuck on waitFor() method of the shell script process!. And yes, I'm reading output and error streams in 2 separate threads. Yes, they are being joined at the end(after waitFor()).

The aspect which makes this question relevant to this forum is, if I put the following line in the shell script(at the top), everything seems to work fine.

Code:
exec 3>&1 > /tmp/some_log 2>&1

And no, interestingly enough, the script doesn't generate any output!. Zero chars!. So putting exec statement there makes no sense!

But still, magically enough, putting exec statement in the script makes java work!. Why??

How can I avoid that illogical exec statement in the script?.

exec has any other functionality here, other than redirection?

P.S: This definitely has got something to do with exec command, hence, this question is meant for shell/script guys and not necessarily for Java guys.
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LEARN ABOUT SUSE

macros.jpackage

MACROS.JPACKAGE(7)						RPM Java packaging						MACROS.JPACKAGE(7)

NAME

       macros.jpackage - RPM macros for Java packagers and developers. Written for the JPackage Project <http://www.jpackage.org/>:

SYNOPSIS

       %_jvmdir
	    Root directory where all Java VMs/SDK/JREs are installed.

       %_jvmjardir
	    Root directory where all Java VMs/SDK/JREs expose their jars

       %_jvmprivdir
	    Root directory for all Java VM/SDK/JRE's private things.

       %_jvmlibdir
	    Root directory for all architecture dependent parts of Java VM/SDK/JRE's

       %_jvmdatadir
	    Root directory for all architecture independent parts of Java VM/SDK/JRE's

       %_jvmsysconfdir
	    Root directory for all configurations parts of Java VM/SDK/JRE's

       %_jvmcommonlibdir
	    Root directory for all common architecture dependent parts of Java VM/SDK/JRE's

       %_jvmcommondatadir
	    Root directory for all common architecture independent parts of Java VM/SDK/JRE's

       %_jvmcommonsysconfdir
	    Root directory for all common configurations parts of Java VM/SDK/JRE's

       %_javadir
	    Directory where arch and version independent jars are installed.

       %{_javadir}-ext
	    Directory where version dependent jars are installed.

       %_{javadir}
	    Directory where arch and version independent jars are installed.

       %{_javadir}-x.y.z
	    Directory where jars for Java standard x.y.z (usually symlinks to  %{_javadir}-ext) are installed.

       %{_javadir}-utils
	    Directory where Java-related scripts are installed.

       %_jnidir
	    Directory where arch-specific (JNI) version-independent jars are installed.

       %_{jnidir}-ext
	    Directory where arch-specific (JNI) version-dependent jars are installed.

       %_{jnidir}-x.y.z
	    Directory where arch-specific (JNI) jars for Java standard x.y.z (usually symlinks to  %{_jnidir}-ext) are installed.

       %_javadocdir
	    Root directory where all javadoc is installed.

       %_mavendepmapdir
	    Directory for maven depmaps.

       %_mavendepmapfragdir
	    Directory for maven depmaps.

       %java_home
	    Current default JVM home. Calls a set_jvm() from java-functions(7).

       %ant Default ant command.

       %jar Default jar command.

       %java
	    Default java command. Calls a set_jvm() from java-functions(7).

       %javac
	    Default javac command.

       %javadoc
	    Default javadoc command.

       %add_jvm_extension
	    add_jvm_extension should be used in %install by extension packages to declare what extension jars they provide.

       %add_to_maven_depmap()
	    add_to_depmap adds an entry to the depmap. The arguments are: %1 the original groupid
	    %2 the original artifact id
	    %3 the version
	    %4 the new groupid
	    %5 the new artifactid

       %update_maven_depmap()
	    update_maven_depmap updates the main maven depmap

       %jpackage_script()
	    A standard script fot running jpackage positive applications.  %1	main class
	    %2	 flags
	    %3	 options
	    %4	 jars (separated by ':')
	    %5	  the name of script you wish to create

DESCRIPTION

       This is a library of generic rpm macros which should be used on jpackage.org compatible distributions.

FILES

       /etc/rpm/macros.jpackage
	    Definitions of macros. For additional informations look at this file.

       /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
       java.conf(5)
       java-functions(7)
       jpackage-utils(7)

AUTHORS

       David Walluck <david@jpackage.org>
       Ville Skytta <scop at 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						MACROS.JPACKAGE(7)