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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 DEBIAN

rhino-jsc

RHINO-JSC(1)						      General Commands Manual						      RHINO-JSC(1)

NAME

       rhino-jsc - invokes the rhino JavaScript compiler

SYNOPSIS

       rhino-jsc [options] file1.js [file2.js...]

DESCRIPTION

       This  manual  page  documents briefly the rhino-jsc command.  This manual page was written for the Debian distribution because the original
       program does not have a manual page. It is written according to the html documentation.

       rhino-jsc is a start script for the rhino JavaScript compiler. The JavaScript compiler translates JavaScript source into Java class  files.
       The  resulting Java class files can then be loaded and executed at another time, providing a convenient method for transferring JavaScript,
       and for avoiding translation cost.  Note that the top-level functions available to the shell (such as print) are not available to  compiled
       scripts when they are run outside the shell.

OPTIONS

       -extends java_class_name
	      Specifies  that  a java class extending the Java class java_class_name should be generated from the incoming JavaScript source file.
	      Each global function in the source file is made a method of the generated class, overriding any methods in the  base  class  by  the
	      same name.

       -implements java_intf_name
	      Specifies  that  a java class implementing the Java interface java_intf_name should be generated from the incoming JavaScript source
	      file. Each global function in the source file is made a method of the generated class, implementing any methods in the interface	by
	      the same name.

       -debug, -g
	      Specifies that debug information should be generated. May not be combined with optimization at an optLevel greater than zero.

       -nosource
	      Does not save the source in the class file. Functions and scripts compiled this way cannot be decompiled. This option can be used to
	      avoid distributing source or simply to save space in the resulting class file.

       -o outputFile
	      Writes the class file to the given file (which should end in .class). The string outputFile must be a writable filename.

       -opt, -O optLevel
	      Optimizes at level optLevel, which must be an integer between 0 and 9.

       -package packageName
	      Specifies the package to generate the class into. The string packageName must be composed of valid identifier characters	optionally
	      separated by periods.

       -version versionNumber
	      Specifies  the  language version to compile with. The string versionNumber must be one of 100, 110, 120, 130, or 140. See JavaScript
	      Language Versions for more information on language versions.

EXAMPLE

       Example compiling the NervousText.js applet written in JavaScript. The example is provided in the librhino-java-doc package.

       $ rhino-jsc -extends java.applet.Applet -implements java.lang.Runnable NervousText.js

SEE ALSO

       The online documentation under http://www.mozilla.org/rhino/jsc.html

AUTHOR

       This manual page was written by Wolfgang Baer <WBaer@gmx.de>, for the Debian project (but may be used by others).

								February  12, 2005						      RHINO-JSC(1)