Links

General Java

• Java6 API: http://docs.oracle.com/javase/6/docs/api/
• Java7 API: http://download.oracle.com/javase/7/docs/api/

Enterprise Java

• Java EE6 API: http://docs.oracle.com/javaee/6/api/

Google App Engine

• General GAE documentation from a Java perspective: https://developers.google.com/appengine/docs/java/overview?hl=sv
• API: https://developers.google.com/appengine/docs/java/javadoc/

JavaFX

• JavaFX2 API: http://download.oracle.com/javafx/2.0/api/index.html

Testing

• Arquillian reference guide: https://docs.jboss.org/author/display/ARQ/Reference+Guide
• JUnit4 API: http://kentbeck.github.com/junit/javadoc/latest/
• JGlue: http://jglue.org, JUnit4 runner that enables CDI in the tests.

Various

• Commons IO: http://commons.apache.org/io/apidocs/index.html
• HSQLDB public API: http://www.hsqldb.org/doc/2.0/apidocs/index.html
• BeanIO: http://www.beanio.org/, good API for ex fixed length file reading and writing or XML manupulation.
• Performance4J: http://perf4j.codehaus.org/, utilities for performance monitoring.

Like to test

• http://www.vagrantup.com/