Tomcat remote debug

Windows:
under tomcatHome/bin create a file called startup-debug.bat or startup.bat and add below:

set JPDA_ADDRESS=8000
set JPDA_TRANSPORT=dt_socket
catalina.bat jpda start

UNIX: 
export JPDA_ADDRESS=8000
export JPDA_TRANSPORT=dt_socket
catalina.sh jpda start

Run the bat/sh file you just modified. Connect at port 8000 for debug..

To configure remote debugging when windows as setup as a service you edit your tomcat configuration and add these startup parameters:

C:\tomcat\bin> tomcat5w //ES//Tomcat5

-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n

Online java IDE

Its a shame we don't have  a proper online java editor to build full scale web applications in java.

Most of them found only allow you to compile a small code snippet or dont allow you to execute java code for security reasons.

Cant imagine the amount of progress we can make if we have a full fledged online java editor. eg: Imagine we are able to do online development of existing java projects on sourceforge site. Imagine how much code you can produce if development is as simple as opening up a browser and keying in your ideas.. Imagine how many projects u can get involved in simultaneously.


JDK6 has the new in memory as well as runtime compiler API: search JavaCompiler. Not many have taken advantage of it i believe.

Some online ide like options:
compilr - can only compile, not run
ECCO: - looks like an interesting project on SF but abandoned 3 yrs back
ideOnea simple code  compile and run project

iBatis - simplify persistence

iBatis is in between hibernate and jdbc. A somewhat ORM. It is more about simplicity.

What is iBatis ?

• A JDBC Framework
  • Developers write SQL, iBATIS executes it using JDBC.
  • No more try/catch/finally/try/catch.
• An SQL Mapper
  • Automatically maps object properties to prepared statement parameters.
  • Automatically maps result sets to objects.
  • Support for getting rid of N+1 queries.
• A Transaction Manager
  • iBATIS will provide transaction management for database operations if no other transaction manager is available.
  • iBATIS will use external transaction management (Spring, EJB CMT, etc.) if available.
• Great integration with Spring, but can also be used without Spring (the Spring folks were early supporters of iBATIS).

What isn't iBATIS ?

• An ORM
  • Does not generate SQL
  • Does not have a proprietary query language
  • Does not know about object identity
  • Does not transparently persist objects
  • Does not build an object cache

Useful links:
Spring 3 + ibatis + maven sample in git : link
ibatis tutorial: link