There have been other reports about TeXlipse getting stuck for various reasons. Here another one.
In my present case, it gets stuck when adding/changing a bibresources for biblatex in the document preamble. When this happens, the workspace is active (responsive for mouse and keyboard input) but says "Building workspace / Invoking LaTeX Builder on MyProject". No actions on the document or even closing the workspace are possible. I have to kill Eclipse manually and restart it twice to get it working again.
It happens when I change any of my \addbibresource entries or when I past a new setup for biblatex into an empty TeXlipse project, e.g.,
% There is a problem when backend=biber is right after the '[' for texlipse.
% see http://sourceforge.net/p/texlipse/discussion/451977/thread/1a984278/
\usepackage[%
backend=biber]{biblatex} % see http://www.ctan.org/pkg/biblatex
\addbibresource{IETF-RFC_Index2.bib}
The Eclipse job manager has then a job about "Parsing" and "Building workspace invoking 'LaTeX Bulder' on '/MyProject'" and sometimes about "Saving document" in its list. The status of "Parsing" is "OK" and "Building workspace" remaining at 75%. The last output in the console window is about running kpsewhich with the bib file that was added:
running: /usr/bin/kpsewhich -progname=bibtex IETF-RFC_Index2.bib
kpsewhich> /share/Bibliography/Standards/IETF-RFC_Index2.bib
I just tested it with a plain new TeXlips project. I cannot repoduce the effect at 100% rate. However it appears a lot.
It is my feeling that it happens more frequently when doing the changes at the \addbibresource part and directly pressing CTRL+S afterwards to save the document. However, I could see it happen even without saving the document, just when pasting/changing the content to the .tex file.
I guess this is triggered by some deadlock in the background parsing of the .tex content for editor-support and setting up the soft-links in the project to the bib resources.
My environment is a Fedora 19 with Eclipse 4.3.1 and TeXlipse 1.5.0.
I just observed the "getting stuck" behavior under a Windows 7 setup with MikTeX2.9, Eclipse 4.3.1, and TeXlipse 1.5.0 under the same condition of changing an \addbibresource line