Java various technologies and comparison:

Frontend Technologies:

JSF vs GWT vs ExtJS vs JBoss Seam vs YUI vs Spring

Backend Technologies:

Spring, JPA/Hibernate, Spring Data, EJB3, iBatis

Presentation Technologies (RIA - Rich Internet Application):

ICEFaces vs RichFaces vs MyFaces

Application Server Comparison:

JBoss AS vs WebLogic vs WebSphere vs GlassFish AS

Apache Tomcat (servlet container)

WebServices Technologies:

Apache Axis2 vs JAX-WS RI vs Apache CXF vs Spring-ws vs JBossWS

JAXP (Processing)

JAXB (Binding)

JAX-WS RI (Reference Implementation)

JAX-RPC

xcerses

xalan

SOAP

RESTful services

SaaS - software as a service

SOA - service-oriented architechture

Data Binding: ADB vs XMLBeans vs JiBX vs castor

Debugging Technologies:

Grinder

ThreadDump viewers

Source Code Control:

GIT vs subversion (SVN) vs CVS vs clearcase vs TFS vs VSS

Security Softwares:

RSA AccessManager vs ClearTrust

Mobile Technologies:

Android vs iOS vs webOS vs Windows Mobile

Cloud Technologies:

Amazon vs Windows vs

Java IDE (Integrated Development Environment):

MyEclipse vs Eclipse vs netbeans vs JBuilder vs IntelliJ

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JBoss AS (Application Server)

JBoss EAP (Enterprice Application Platform)