When MyEclipse starts, the message "Initializing Java Tooling... [n%]" is the first or second message to appear. I Googled the phrase, but all I get are posts from people who are frustrated that MyEclipse freezes or crashes during tooling. I'm using v7.5, but the phrase is not version-specific, based on those Google results. I don't have that problem, my MyEclipse works fine; I just want to know what "Initializing Java Tooling" means.
I just want to know what "Initializing Java Tooling" means.
Well, it means that the IDE is currently initializing the Java tooling: loading plugins, setting up data structures for internal use, whatever. You don't have to know anything about it unless you're developing an IDE plugin yourself.
Eclipse is not a java-specific tool. The plugin that handles Java development (called the JDT) initializes itself with the message "Initializing Java Tooling".
That is all. Move along now.
If my experience is anything to go by, after you've been using MyEclipse (or regular Eclipse) for some time, and you have a few projects of interesting size, you will find that error, where "Initializing Java Tooling" just hangs. It's a real nuisance. I've found the best way to avoid it is to close projects before you close eclipse. It's a pain, but it's less pain than having to create a new workspace...