Created: 2008-08-29 12:05
Updated: 2016-05-08 12:35
License: apache-2.0


Roller reCAPTCHA Plugin


  • JDK 1.5 or greater.
  • Roller 4.0 or greater.

Copyright and Licensing

The source code to this plugin is released under an Apache 2.0 License.

Copyright 2008 Alex Coles.

A copy of the License may be found in the accompanying APACHE-LICENSE-2.0 file.

This plugin bundles the ReCaptcha Java Library, from Tanesha Networks.


Install files

You can use the installer script provided to perform the file installation for you: ROLLER_INSTALL_DIR=/usr/local/tomcat/webapps/roller ./

Or, if you prefer a manual installation, copy the following libraries to your ROLLER_INSTALL_DIR/WEB-INF/lib:

  • recaptcha4j-0.0.7.jar: the ReCaptcha Java Library
  • roller-recaptcha.jar: this plugin


  1. Edit your with your favourite editor. If you installed Roller to Tomcat for example, your Roller configuration will most likely be found in $CATALINA_HOME/common/classes/

    You'll need to go to and get the API keys. Once you've done that, set the following property in your

    comment.authenticator.recaptcha.key_public=<get one at> comment.authenticator.recaptcha.key_private=<get one at>

    and make the ReCaptchaCommentAuthenticator your comment authenticator:

    comment.authenticator.classname=\ com.ikonoklastik.roller.ui.plugins.comments.recaptcha.ReCaptchaCommentAuthenticator

  2. Once you're done, restart your Roller web application. Ensure that comments are enabled in your site-wide settings.

Building the Source

This plugin was developed with the NetBeans IDE. A NetBeans project is included along with the source code.

To compile the Roller reCAPTCHA plugin, you'll need to download either the Roller source or binaries:

wget http://apache.mult

The plugin has the following dependencies, which you will need to include in your compile path:

  • roller-business
  • roller-core
  • roller-web
  • commons-httpclient
  • commons-logging
  • Servlet API

More detailed instructions for building the source will be added.


Use is at your own risk. Comments, feedback and patches are welcome though. You can contact the developer at

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