Linux Swords » Java

Find a specific class in your maven repository

martin — Thu, 08 Jan 2009 22:27:19 +0000

If you don’t want to use findjar, you can use a groovy script.

You can use the following:

It will search recursively all jar files under ‘/home/USER/.m2/repository’, just adjust the value for ‘USER’.

Please excuse the poor formatting of the code, I blame the browser for it

import java.util.jar.JarFile


if (args?.size() == 0 || args[0]?.length() == 0)

{

    println "usage with Parameters:  [pathToJarFiles]"

    println "per default /home/USER/.m2/repository will be searched"

    println

    System.exit(1)

}
def searchingClass = args[0]

def folder = args.size() > 1 ? args[1] : "/home/knm/.m2/repository"
println "groovy searching for Class $searchingClass in $folder"

def basedir = new File(folder)
// gets all jar-files in basedir

jars = []

 public void  recursedirs(File filedir)

 {

  filedir.listFiles().each

  { file ->

    if (file.isFile() && file.name.endsWith("jar") )

     { jars << file }

     else if (file.isDirectory() )

     { this.recursedirs(file) }

  }

 }

recursedirs( basedir)

files = jars

for (currentFile in files) { try { new JarFile(currentFile).entries().each {entry -> if (entry.name =~ searchingClass) { tmp = entry.name.replaceAll("/", ".").replaceAll(".class", "") println "$tmp ===> $folder/$currentFile.name" } } } catch (Throwable t) { println "\nFailed to open $currentFile.canonicalPath: ${t.toString()}" } }

created new yubnub command: findjar

mjava — Wed, 31 Dec 2008 08:15:53 +0000

I just recently stumbled accross www.findjar.com, a usefull tool
to find jar-files [who would have guessed..]

And I created a yubnub command for it: findjar

Hope somebody else finds this usefull too

Blogged with the Flock Browser

Tags: javajar

Podcast for Software Engineers

mjava — Tue, 15 Apr 2008 04:36:47 +0000

I recently started to listen to podcast and the variety of podcasts is really big.

I discovered http://www.se-radio.net. This site produces
podcasts for software engineers. I really enjoy the possibility to learn while traveling

Today, I started listening to the parts of concurrency. Did you know there is a bug classification called Heisenberg-Bugs? A Heisenberg-Bug is a Bug in a multithreading application which dissappears while debugging, because of the debugging, logging statements etc. you changed the speed and behaviour of the application. So you cannot reproduce the bug in the test-environment, but in the production environment the bug still exists! A real PITA, and with PITA I do not mean the bread

groovy script beautified

mjava — Mon, 24 Mar 2008 16:55:33 +0000

I rewrote my groovy-script to have better output:

searchJar.groovy

Fixed ‘View Javadoc in external Browser’ in IntelliJ IDEA

mjava — Sat, 15 Mar 2008 08:44:56 +0000

An annoyance in IntelliJ IDEA was that the command ‘View Javadoc in external Browser’ did not work
per default on a mac. On a mac with it’s own java sources the api-doc are located inside a jar and therefore
not able to browse through a normal webbrowser. (If you know a browser which can handle a jar://xxx address let me now in a comment)

IntelliJ does not open or extract those files per default so I did by hand with:

cd /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home jar xf docs.jar // this will extract the contents of the jar jar xf appledocs.jar // dito

No we need to point IntelliJ to the extracted files. Open your Preferences -> Project Preferences.
Click on the desired JDK and then click on the tab ‘javadocs’. Remove the old entries for the jar and enter
the extracted path/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/docs/api /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/appledocs/api

Not it works. To test it, move the cursor to a class,member whatever and press +. The appropriate javadoc should open in your default browser.

This is not a bug fix, just a bad default configuration. I’d like to see this fixed in the next release…

IntelliJ IDEA

mjava — Sat, 15 Mar 2008 00:38:43 +0000

7.0.3 is out now. get it!

learning groovy…

mjava — Tue, 11 Mar 2008 12:58:14 +0000

… is like Alice climbing through the rabbit hole.

I just connected to a db, did a query from a table and printed out a selection of columns in just
2 lines of code, yes TWO LINES!

groovy-script: lookup classes in jar-files

mjava — Tue, 11 Mar 2008 06:48:40 +0000

Recently I had following problem. I had a bunch of jar-files and I had to find out which jar-file was holding a specific class.

This is a common task, because your java-code told you that a class XY was not in you classpath, so you would have to search for it, if you don’t know already where to find it.

Since I had to do it already 2 times and as I am learning groovy I decided to write a short groovy-script
(are there long groovy-scripts?) which allows me to do that.

It is pretty straight-forward so here it is: searchJar.groovy

Hudson has a groovy console

mjava — Fri, 07 Mar 2008 14:24:08 +0000

I am playing around with hudson as a integration server.

So far it is very nice and intuitiv, you can even trigger builds by email, mobile etc! And just
yesterday it has groovy-console builtin for monitoring maven2-builds!

Isn’t it a good day when you recover that your new tools already know each other?

Although I have to admit that hudson lacks some features I would like to have such as
access-control per project. For now there is an access-control (LDAP, Matrix-like etc) for the whole build-server…

JSR 666

mjava — Wed, 13 Feb 2008 21:19:10 +0000

I just read about JSR 666.

First I took it for serious, but when i read about SchrödingerException
I could not help laughing.

My other favorite tough was ‘import *;‘