(over to JavaTips)

A report generation tool in Java: http://datavision.sourceforge.net/

Many languages have been implemented (or re-implemented) in Java. Here's a list: Programming Languages for the Java Virtual Machine http://grunge.cs.tu-berlin.de/~tolk/vmlanguages.html

I like to have code generate documentation where possible, since that keeps the docs close to the code. I'm intrigued by the idea of literate programming but don't really have the time to pick it up. Here's a little javadoc plug-in that generates UML diagrams from Java source code. http://relativity.yi.org/jase/

This is an interesting paper about how the singleton pattern gets abused, why that's bad, and one approach to working around the problem: http://www-106.ibm.com/developerworks/webservices/library/co-single.html

Interesting server framework: http://www.destinystar.com/
Compare with Avalon: http://jakarta.apache.org/avalon/

Java(TM) 2 Platform, Enterprise Edition Blueprints | http://java.sun.com/j2ee/blueprints/ This is how Sun thinks you should build big applications using Java. I pretty much agree, except that I don't like JSP.

xslt -> PDF print formatter | http://xml.apache.org/fop/

Log4j - a java logging and tracing package | http://www.log4j.org/

EJB Containers

• A list of commercial and free EJB servers: http://www.mgm-edv.de/ejbsig/ejbservers.html
• OpenEJB - an open-source ejb container from the author of the o'reilly ejb book . Very much under construction: not really useful at the moment but a great opportunity to find out how an EJB container really works. http://openejb.exolab.org/
• jBoss -- open source EJB server - Eliot Polk recommends http://www.jboss.org/
• JOnAS Open Application Server for EJB, looks like it was written by a research group inside Groupe Bull and now it's a spin-off called Evidian. http://www.evidian.com/jonas/index.htm

Decimal arithmetic for Java - 1.08 | http://www2.hursley.ibm.com/decimalj/

Advanced Programming for the Java 2 Platform | http://developer.java.sun.com/developer/onlineTraining/Programming/JDCBook/index.html

Sun's JDBC Technology Site - http://java.sun.com/products/jdbc/
JDBC RowSet is a good way to move jdbc data around a system.

jGuru: Enterprise JavaBeans(TM) Fundamentals | http://developer.java.sun.com/developer/onlineTraining/EJBIntro/EJBIntro.html | An online course in Enterprise JavaBeans at Sun's web site

JavaWorld | http://www.javaworld.com/

ICU4J - International Components for Unicode for Java | http://oss.software.ibm.com/icu4j/

JUnit, Testing Resources for Extreme Programming | http://www.junit.org/

Java(TM) Technology & XML | http://java.sun.com/xml/

the serverside.com - your middleware portal | http://www2.theserverside.com/

Compilers

• Kopi - http://www.dms.at/kopi/index.html
• KopiSusu - a GPL java compiler ( a branch of Kopi) http://www.klomp.org/KopiSusu/

JVM's

• joeq - a JVM written in Java: http://joeq.sourceforge.net/

Implementing the Singleton Pattern in Java - Rod Waldhoff | http://members.tripod.com/rwald/java/articles/Singleton_in_Java.html

JSwat - Graphical Java Debugger | http://www.bluemarsh.com/java/jswat/

http://ejen.sourceforge.net/intro.html - Java/xml/xslt code generator.

http://alfj.sourceforge.net/ - a trace logging library that can log all call/returns without explicit log statements.

http://opensource.yourdecor.ca/jspdoc/ - JSP documentation generator, like javadoc for jsp's. (I tried version 20020909 and it was pretty rough. I think that it would be good to integrate into a new project but it might be hard to retrofit into an existing one.)

XML

http://jxv.sourceforge.net/ - xml <->objects
also JAXB (from Sun), Castor (from Exolab, very fussy).
http://jaxme.sf.net/ - another. sucky website, dunno bout the code.