Develop Reference

can't make a shell script to make a jar file

I try to make a simple shell script to make a jar file. The jar command combined with -C does not work with wildcards. Therefor I use a wildcard to find the files I want. Write them to a file, and loop over them.
It looks something like this:
the_classes=''
cd "$bin_folder"
tmp_dir=$(mktemp -d -t java_sucks)
find "imui/core/" -type f -name "IMUI_Widget_Agent*.class" >"$tmp_dir/classes.txt"
while IFS="" read -r p || [ -n "$p" ]
do
the_classes="${the_classes} -C '$bin_folder' '$p'"
done < "$tmp_dir/classes.txt"
Using the above I complete the command:
cmd='jar cfm build/IMUI_Widget_Agent.jar'
cmd="${cmd} \"$bin_folder/imui/core/IMUI_Widget_Agent_MANIFEST.MF\" $the_classes"
printf "\n\n\ncmd\n\n\n"
echo $cmd
Now if I copy and paste this command to execute it works!
But I want to avoid the manual labour of doing the copy and paste by hand every time.
Now I have:
eval "$("$cmd")"
But I get an error File name too long. No matter what I try, every fix I do creates a new problem. I have been working 6 hours now to make this script.
What would be a good step forward?

Since you cd "$bin_folder" you don't actually need -C "$bin_folder":
#!/bin/bash
shopt -s globstar
cd "$bin_folder"
jar cfm build/IMUI_Widget_Agent.jar \
imui/core/IMUI_Widget_Agent_MANIFEST.MF \
imui/core/**/IMUI_Widget_Agent*.class
However, if you still want to add them as part of a larger script, you can easily and robustly build your command in an array:
#!/bin/bash
shopt -s globstar
cmd=(jar cfm build/IMUI_Widget_Agent.jar imui/core/IMUI_Widget_Agent_MANIFEST.MF)
cd "$bin_folder"
for file in imui/core/**/IMUI_Widget_Agent*.class
do
cmd+=(-C "$bin_folder" "$file")
done
echo "About to execute: "
printf "%q " "${cmd[#]}"
echo
"${cmd[#]}"
Alternatively, you can simply do eval "$cmd" with your code, which is equivalent to echo and copy-pasting. However, be aware that this is fragile and error prone because it requires careful escaping of the filenames which you're not currently doing.

Shell script with jar file at the end

I download an archive file. In the archive there will be a file that has a .sh. extension. When I opened that file with VI I found the below code in the beginning of the file:
#!/bin/sh
MYSELF=`which "$0" 2>/dev/null`
[ $? -gt 0 -a -f "$0" ] && MYSELF="./$0"
java=java
if test -n "$JAVA_HOME"; then
java="$JAVA_HOME/bin/java"
fi
exec "$java" $java_args -jar $MYSELF "$#"
exit 1
I can run the jar by doing java -jar file or `./file'.
Can someone explain me what is going on? How can you create such file?

Try by yourself the following commands. Start creating a normal jar file with any content, or use someone you have. I will name it "myjar.jar"
Next, create a file "hello.sh" with content:
#!/bin/bash
exec echo hello
now, add this file at start of a new jar file:
cat hello.sh myjar.jar > mytrick.jar
chmod 700 mytrick.jar
And finally, the interesting part, type:
./mytrick.jar
jar -tf mytrick.jar
unzip mytrick.jar
in other words, usually jar/unzip skips any content until their own header. Moreover, a shell script "ends" in a line who call "exec" (because shell interpreter is replace at this point by the command in the exec line).
However, this trick is based in a behaviour of jar/unzip probably out of standards. Note, by example, that this statement fails (has no effects):
jar -xf mytrick.jar

If the file after extracting the tar file is start-superbeam.sh try doing chmod +x start-superbeam.sh && ./start-superbeam.sh or /bin/sh ./start-superbeam.sh.
If the program has arguments, supply them after at the end. It will run java on that the superbeam.sh which as a jar file at the end.
If you need special java parameters set such as for memory size, you would set them in the environment variable java_args.
As for what's going on this is a shell script with a jar file at the end of it after the exit. To quote from ReallyExecutable Jars:
There has long been a hack known in some circles, but not widely
known, to make jars really executable, in the chmod +x sense. The hack
takes advantage of the fact that jar files are zip files, and zip
files allow arbitrary cruft to be prepended to the zip file itself
(this is how self-extracting zip files work).
As for how to create, see the accepted answer or the link.

how to execute jar file in hadoop platform in ubuntu?

I can create Mapreduce programme, so i can configure hadoop in eclipse. after i can create 1. mapper, 2. reducer, 3.mapreducerDriver
after i can create jar file with help of Makefile in shell command prompt,
after i can use
this command
hadoop jar $ {JarFile} $ {MainFunc} input output
make file
JarFile = "Sample-0.1.jar"
MainFunc = "mypack.Mapreduce"
LocalOutDir = "/ tmp / output"
after i use
jar-cvf $ {Sample-0.1.jar}-C bin /.
jar file created , finally i can write this command.
hadoop jar $ {Sample-0.1.jar} $ {mypack.Mapreduce} input output
finally i get like this error will come in command prompt.
bash: ${mypack.Mapreduce}: bad substitution
how can i solve this problem . pleasae help me
now i find sollution
hadoop jar $ {Sample-0.1.jar} mypack.Mapreduce input output
then hadoop will be run .

Write a script like compile.sh
$ mkdir wordcount_classes
$ javac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d wordcount_classes WordCount.java
$ jar -cvf /usr/joe/wordcount.jar -C wordcount_classes/ .
For reference: http://hadoop.apache.org/docs/r1.0.4/mapred_tutorial.html

Remove file from *.jar, using script

I have next package structure
webService.ear -- dependency.jar -- some.class
Can I remove some.class from .ear using cmd script and bash script?
Solution:
I wrote cmd script for this:
call unzip target\webService.ear -d tmp
call zip -d target\tmp\dependency.jar \com\mypackage1\MyClass1.class
call zip -d target\tmp\dependency.jar \com\mypackage2\MyClass2.class
call jar cvfM target\webService.ear -C tmp .
May be, this will be helpful for someone

There is no option to the jar command to remove entries.
However, the jar format is processable with zip tools, so you should be able to use a command-line zip (GNU zip, for instance) to remove members.

Calling java program dependent on external library

I am trying to call a java program in php to use it with web interface.
Java program is dependent on an external lib: commons-cli-1.2.jar
So basically I need to export it before calling the java program; but if I export it first as:
shell_exec('export CLASSPATH=$CLASSPATH:~/lib/commons-cli-1.2.jar');
then call the java program as:
shell_exec('java ComputePagerank -i $para_i -d $para_d -e $para_e -o $para_o');
I think it creates different shells for each call; then the export does not have any effect on java program. Or am I wrong?
Otherwise, it should output a file in the server. But simply it does not. So, what is wrong? Any idea?
edit: However can it be because some parameters such as para_i stands for an input file name, so that i have to specify full path for that? Because I just assume if the input file is in the same working directory, there won't be any problem, will it?
edit-2: it outputs properly when i use command line;)

you're right, each shell_exec creates a separate shell.
env CLASSPATH=whatever java -switches

I would use
shell_exec('java -cp $CLASSPATH:/home/yourname/dir/lib/commons-cli-1.2.jar ComputePagerank -i $para_i -d $para_d -e $para_e -o $para_o > message');
and (this is important) replace the tilde(~) with the actual path to your directory (/home/yourname say). The ~ is expanded by the shell and is dependent on which shell you''re using.

Try Creating a simple shell script with the commands that you want to execute. You may pass arguments to a shell script so that is not a problem either.
for example
echo "Running Script..."
java -cp $CLASSPATH:~/lib/commons-cli-1.2.jar ComputePagerank -i $1 -d $2 -e $3 -o $4 > message
etc.
Then try calling it from the command line first with some parameters. Did it output? Then try calling it from the php script. Did it output? If it did not then you may need to check permissions. I had a simiolar experience some time ago with a Java program that simply did not have permission to write a file.

You should be able to call it like this.
shell_exec('java -cp $CLASSPATH:~/lib/commons-cli-1.2.jar ComputePagerank -i $para_i -d $para_d -e $para_e -o $para_o > message');
Another option is to issue the 2 commands seperately, but to the same shell, like this:
shell_exec('export CLASSPATH=$CLASSPATH:~/lib/commons-cli-1.2.jar; java ComputePagerank -i $para_i -d $para_d -e $para_e -o $para_o > message');
edit:
some shells don't let you call export while you're setting up the variable. so this may be safer than the second option above:
shell_exec('CLASSPATH=$CLASSPATH:~/lib/commons-cli-1.2.jar; export CLASSPATH; java ComputePagerank -i $para_i -d $para_d -e $para_e -o $para_o > message');
another edit:
If none of the above work then you're going to have to do some more trouble shooting. Does your java program work from the command prompt?
java -cp $CLASSPATH:/home/user/lib/commons-cli-1.2.jar ComputePagerank -i param1 -d param2 -e param3 -o param4 > message