Adding a new library must be submitted for discussions. We should avoid having multiple libs for the same need.

Java

Unit Tests

• JUnit 4
• FEST Assert, heavily recommended for replacing Hamcrest matchers
• Mockito
• XMLUnit for comparing XML documents
• DBUnit
• SubEtha SMTP

Utilities

• Guava. Warning : google-collections must be excluded from transitive dependencies
• Commons Lang. Note : pending experiments to move to Guava.
• Commons IO 2.2. Version 2.3 is not accepted because it does not support Java 5. Note : we're doing some experiments to move to Guava.
• Commons Codec, for example for Base64 encoding
• Freemarker for templating
• json-simple

Deprecated

• Commons Collections is deprecated and replaced by Guava.
• Commons BeanUtils is not recommended
• Commons Configuration is replaced by org.sonar.api.config.Settings

Database

• MyBatis
• Apache Commons DBCP

Hibernate is deprecated and must not be used in new developments.

XML

Writing and reading XML documents should be implemented with Stax :

• Staxmate
• Woodstox parser

All other technologies are deprecated or forbidden (XStream, DOM4J, JDOM, ...)

Logging

• SLF4J
• Logback

All other libraries must be excluded from transitive dependencies (log4j, commons-logging) and replaced by jcl-over-slf4j/log4j-over-slf4j

Javascript

• Prototype 1.7
• Scriptaculous 1.9.0, provided under the MIT License.
• Protovis 3.3, a visualization toolkit using SVG. Does not depend on Prototype. Provided under the BSD License.
• Protovis MSIE, a compatibility layer for Protovis that adds support for VML compatible browsers (IE7 and IE8)

Should be dropped soon :

• Tablekit 1.2.1, sortable HTML tables using Prototype, provided under the MIT License.
• Prototip 1.0.2 to create nice tooltips. It depends on Prototype.