Red Hat Developer Studio 1.0 (beta1) is released for download and comments.
Red Hat Developer Studio is a set of eclipse-based development tools that are pre-configured for JBoss Enterprise Middleware Platforms and Red Hat Enterprise Linux.
Linux and windows versions are available.
The size of download (at least for Linux) is 530 MB.
Read installation manual for how to install.
TIP: to run jar archive issue
java -jar <jar archive>
Here is how it looks: