How-to find a class in a JAR directory using shell scripting

The biggest problems in J2EE applications deployment  come often from classloader hierarchies and potential overlapping between server-provided and application-specific libraries. So, searching classes through collection of JARs is oftwen the main activity in order to identifiy and fix classloader issues.

This is surely a tedious and repetitive task: so, here's a shell script you can use to automate JAR collection traversing and tar command's output analysis to search a pattern, which is provided as script parameter.

Credits: Thanks to sirowain for parameter check and return code related contributions.

#!/bin/bash
# Commonly available under GPL 3 license
# Copyleft Pietro Martinelli - javapeanuts.blogspot.com
if [ -z $1 ]
then
        echo "Usage: $0 <pattern>"
        echo "tar xf's output will be tested against provided <pattern> in order\
          to select matching JARs"
        exit 1
else
        jarsFound=""
        for file in $(find . -name "*.jar"); do
                echo "Processing file ${file} ..."
                out=$(jar tf ${file} | grep ${1})
                if [ "${out}" != "" ]
                then
                        echo "  Found '${1}' in JAR file ${file}"
                        jarsFound="${jarsFound} ${file}"
                fi
        done
        echo "${jarsFound}"
        
        echo ""
        echo "Search result:"
        echo "" 
        
        if [ "${jarsFound}" != "" ]
        then
                echo "${1} found in"
                for file in ${jarsFound}
                do
                        echo "- ${file}"
                done
        else
                echo "${1} not found"
        fi
        exit 0
fi

This script is available on github.com:

https://github.com/pietrom/javapeanuts-shell-utils/blob/master/find-jar.sh

How to clean-up JBoss temporary directories using bash scripting

Repetitive and annoying file system tasks are the natural field of automation through shell scripting - so, here's a script  that can be used to clean up temporary directories created by JBoss Application Server.

You can provide as parameter the name of the node that you want clean up - if launched without parameters, the script cleans up temporary directories in each node under current installation.

Tested on JBoss 4.0.5.GA and JBoss 5.1.0.GA installations.

#!/bin/bash

# Commonly available under GPL 3 license

# Copyleft Pietro Martinelli - javapeanuts.blogspot.com

function cleanTmpDir {
        echo "  Cleaning ${1}/${2}"
        rm -rf "${1}/${2}"

}

function cleanNode {
        echo "Cleaning \"${1}\" jboss node"
        for tmpDir in data log tmp work
        do
                cleanTmpDir ${1} ${tmpDir}
        done
}


if [ $# -eq 0 ]
then
        for dir in $(find server -maxdepth 1 -mindepth 1 -type d)
        do
                cleanNode ${dir}
        done
else
        if [ -e "server/${1}" ]
        then
                cleanNode "server/${1}"
        else
                echo "${1} is not a subdir of server dir"
        fi
fi

Updated: this script is now available on bitbucket.org:
https://bitbucket.org/thecleancoder/javapeanuts-shell-utils/src