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Spell Checker Java Dictionary
Standard Java dictionary based on Maven repository
Seam Maven 2 Studio for IDEA
This plugin creates Seam 2.0 projects that use Maven 2 for builds.
Raven
Manager for maven repositories. It supports viewing local and remote repositories, adding and downloading dependencies as module libraries and updating project.xml descriptors.
mevenide-idea
This plugin provides strong integration of Maven with IntelliJ IDEA.
MavenProjectHelper
Maven Project Helper plugin for IntelliJ IDEA.
Feature:
  • generate maven project skeleton from various maven archetype.
  • search maven archetype from local repository.
  • search maven archetype from central repository (addtional download required).
  • add dependency support
How to enable search from central repository?
MavenPlugin
Integrates Maven into IDEA
Maven1.x Repository Updater
This plugin is created to work with maven 1.x. When you use maven 1.x inside a multi module project, some times handling of artifacts by maven is problematic and cumbersome, especially when it comes to handling SNAPSHOT dependencies. This plugin will check the dependencies and update your local repository with the latest dependencies, mentioned in your project descriptors, enabling you to build your project offline. This will significantly improve the build time of your project. Select any of your modules and press Ctrl+Shift+Alt+U to activate this plugin.
Maven Repo Search
Maven Repo Search Plugin IDEA Ports.
original is here.
Maven Reloaded
A plugin that inspects the project space for Maven 2 POM files and modifies the module source and test roots, classpaths, and inter-module dependencies. It also provides the capability to execute Maven 2 goals on a POM from the IDE.
Maven Dependency Sync

Keep your IntelliJ classpaths synchronised with a Maven POM File. You don't need to use Maven as your build tool, just leverage its handy dependency management!

Quick Instructions
  1. Create a POM file for your module(s) listing top level dependencies.
  2. Optional In the project settings under Maven Dependency Sync, configure a list of repositories. You can mix file and HTTP repositories. By default http://ibiblio.com/maven2 is chosen.
  3. Associate a POM file with an IntelliJ module in Project Structure -> module -> POM File.
  4. Then use Tools -> Fetch Dependencies to download all dependencies for modules with POM Files.
More Information Transitive dependencies are also fetched. This means you if you depend on hibernate, its dependencies (e.g. cglib, asm) will be fetched.

When a library is first fetched source and javadoc are automatically fetched. If they were not available from the remote repository you can install them in a local maven repository and then right click the library in the Project View -> Fetch Source and Javadoc.

A module can mix maven configured and manually configured libraries. The order of dependencies specified in the normal IntelliJ dependencies configuration will be preserved.

The local maven repository (a cache of downloaded artifacts) is located in $HOME/.m2/repository. The IntelliJ classpath will point at jar files in this directory. A future version of the plugin will be more flexible with this location.

You can use the same POM files to configure classpaths in your Ant build using the Maven dependency maven.apache.org/ant-tasks.html\\\">Ant tasks.

Maven Dependency Manager
Compares and synchronizes dependency differences between Maven 1.0 projects and IntelliJ IDEA modules. Unlike the Maven plugin for IDEA, this plugin preserves other module settings updating only the dependencies. Adds the following menu items to the Tools menu:
  • Maven -> IDEA updates the IDEA module with dependencies from the Maven project.

  • Maven [- IDEA updates the Maven project with dependencies from the IDEA module.

  • Maven [-> IDEA compares the dependency differences.

Maven build-this-module plugin
Adds a menu item in the Build menu to run the install goal for the maven module that contains the current file.
Maven Archetypes
This plugin helps to generate initial java project layout with the help of Maven Archetypes.
Maven 2 Integration
This plugin integrates Maven 2 into IntelliJ IDEA
JarDoc

Open JAR packaged JavaDoc documentation in Firefox. Especially useful for Maven users. You will need to set Firefox as your external browser. If the JavaDoc target is not a JAR file, this will behave similarly to the native "Open In Browser".

In order for this to work in OS X you must create an executable script and have Idea use this instead of the default browser. This is the contents of mine:

#!/bin/sh osascript -e "tell application \"Firefox\"" -e "activate" -e "OpenURL \"$1\"" -e "end tell"

Shortcut: SHIFT+ALT+F1

Jar Juggler
Library package manager. It downloads jars, source, and javadocs from maven2 and ivy repositories, then configures them for your project. After installing you can launch Jar Juggler under Tools -> Jar Juggler.
Clover for IDEA
Clover is an award-winning Java code coverage analysis tool. Clover instruments source code and then records precisely what is executed when tests are run. The detailed test coverage reports help developers easily identify areas where the testing is weak, enabling them to write better tests faster. Clover fits into a developer's environment, be it Ant, Maven, IDEA, Eclipse or the command line. Quality Assurance and Project Managers can access important quality metrics over time via html and pdf reports. Clover provides test analysis to thousands of companies and open source projects all over the world.
Documentation is available online from http://confluence.atlassian.com/display/CLOVER/Clover-for-IDEA
To activate this plugin, you will require a Clover license file, available from the Clover license page on atlassian.com