jar

Solution to the Scala jar class file is broken error

I just ran into the following Scala jar (class) is broken error:

By Alvin Alexander on April 22, 2013

How to add a new jar file to the Scala REPL classpath (interactive command line)

Scala REPL FAQ: How do I add a Jar file to the Scala REPL classpath? (The Scala REPL is the interactive command line you get if you just type "scala" at your command line.)

To add a new jar file to the Scala REPL classpath (interactive command line classpath), use the ":cp" command at the command line, like this:

scala> :cp myjar.jar

After you do this, you should see a reply from the REPL like this:

By Alvin Alexander on March 1, 2013

How to search multiple jar files for a string or pattern

Here's a shell script that I use that search Java jar files for any type of pattern. You can use it to search for the name of a class, the name of a package, or any other string/pattern that will show up if you manually ran jar tvf on each jar file. The advantage of this script -- if you're a Unix, Linux, or Cygwin user -- is that this script will search through all jar files in the current directory.

By Alvin Alexander on October 17, 2012

Where are Java WebStart files kept on Mac OS X 10.6?

Mac Java WebStart FAQ: Where are Java WebStart files (Jar files) kept on Mac OS X systems? And how can I delete WebStart apps on a Mac?

Java WebStart Jar files are kept below this directory on Mac OS X 10.6:

/Users/al/Library/Caches/Java/cache

More than likely you're asking because you want to delete these Java WebStart files on your Mac. The easiest way to delete them is:

By Alvin Alexander on October 20, 2012

A JRuby jar include tip

Ever need to include a Java jar file in a JRuby script? As I work to convert my Mac speech recognition server to JRuby, the first task I need to tackle is to include the Sphinx-4 jar files in my JRuby path. You can include one Java jar file in your JRuby script path very easily, like this:

require 'lib/sphinx4.jar'

where the jar file 'sphinx4.jar' is in a local subdirectory named lib, which is cool. But if you need to include many Java jar files into your JRuby script at one time, here's a very cool way to do that:

By Alvin Alexander on October 17, 2012

Java, Mac, and the Dock: How to handle drop events to a Mac OS X Dock icon

Lately I've been doing a lot of Java programming on Apple's Mac OS X platform, and my most recent effort has been to handle drag and drop events in my Java Swing application. Not satisfied to handle "simple" drag and drop events, I decided I wanted to take my application even farther, and let users drag files and images to my Java application icon in the Mac Dock.

By Alvin Alexander on October 20, 2012

Eclipse build path - How to add a new jar file to your Eclipse build path

When you're working with a Java project in Eclipse and you need to add a new jar file to your project, you don't need to close down Eclipse or your current Eclipse project (as I've seen a few people do). In fact, here are all the steps you need to take to add a new jar file to your Eclipse build path:

By Alvin Alexander on October 17, 2012

Java: How to handle drop events to your Mac OS X Dock icon (Part 2)

In Part 1 of this tutorial I shared the Java source code you need to handle drag and drop events on Mac OS X. But as I mentioned in that tutorial, the recipe to handle files that are dropped onto your Dock application icon requires a little more work, in particular an Ant build process that uses the JarBundler task. So here in Part 2 of this tutorial, I'm sharing my Ant build script that completes this recipe.

By Alvin Alexander on October 20, 2012

Java - How to create a Jar file in an Ant target

Here's an example of an Ant target that creates a jar file. This Ant target creates a jar file for a Java Swing application I've created named "WikiTeX".

Here's the source code for my Ant target:

By Alvin Alexander on October 17, 2012

Ant compiling - How to reference the jar files in your lib directory during your Ant compile process

Here's a quick snippet of code from an Ant build script that demonstrates how to create a classpath variable in an Ant script, where the classpath is built from all of the jar files in your project's lib folder:

By Alvin Alexander on October 17, 2012
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