#!/usr/bin/env groovy

import java.util.jar.*

//Usage check.
if(args.size() <2){
	println "usage: ${this.class.name} searchstr jarfile [jarfile]"
	println "  jarfile can be a directory, which will include all jar files."
	return
}

//Collect args for jar files.
searchstr = args[0]
jarfiles = []
args[1..-1].each{ arg->
	file = new File(arg)
	if(file.isDirectory()){
		file.eachFileMatch(~/.*\.jar$/){ jarfiles.add(it) }
	}else{
		jarfiles.add(file)
	}
}
//println binding.variables

//Find and print the entry listing!
jarfiles.each{ file->
	jarfile = new JarFile(file)
	jarfile.entries().each{ entry->
		if (entry.name =~ searchstr){
			println "$entry.name : $file.canonicalPath"
		}
	}
}

Eg: groovy findjar "Servlet" /opt/tomcat/lib

Search entry in jar files

java

Groovy