Installation of Spring IDE 2.0.X using the Callisto Discovery Site
The following instructions describe how to install Spring IDE with all dependencies using the Callisto Discovery Site:
- Make sure you have installed JDK 5.
- Download and install the latest release version of Eclipse SDK 3.2.x. Make sure that your Eclipse is starting up using JDK 5.
- Start Eclipse and create a new workspace (optionally check "Use this as the default and do not ask again")
- After the startup of Eclipse open the Install / Update dialog via the menu entry "Help > Software Updates > Find and Install ..."
- Select the option "Search for new features to install" and hit "Next >"
- Add a new entry with the Spring IDE updatesite http://springide.org/updatesite/
- Select the entries for the Callisto Discovery Site and the Spring IDE updatesite and hit "Finish"
- Select the features "Spring IDE x.x.x" and (at least) "Web Standard Tools (WST)" from the list of available features
- To get rid of the the error messages "x requires feature y" hit "Select Required"
- IF you get an error like this:
"Requested operation cannot be performed because it would invalidate the current configuration. See details for more information.
Spring IDE AJDT Integration (optional) (2.0.1.v200708152145) requires feature "org.eclipse.ajdt".
you can either uncheck the "Spring IDE AJDT Integration (optional) (2.0.1.v200708152145)" plugin so it will not be installed or just add another remote site to install AJDT from the Europe Discovery Site or from http://download.eclipse.org/tools/ajdt/33/update. - Now hit "Next >", accept the feature licenses and hit "Next >" again

11. After hitting "Finish" the download is started
12. After the download is finished you're prompted to verify all features which are not digitally signed. Hit "Install All" to start the installation. 
13. After the installation is finished you're prompted to restart Eclipse. Hit "Yes" to restart Eclipse. 
14. After Eclipse is restarted you can verify if all features are successfully installed via Eclipse's About dialog (menu entry "Help > About Eclipse SDK"). Here an icon for Spring IDE and WebToolsshould be available. 
Congratulations. You have made it!
Now follow this small guide in Spring IDE home to get familiar with how to use Spring IDE to develop your spring projects.