Installing net.sf.servereclipse_0.1.2 in 3.1M3 breaks
internal Properties File Editor.
Here is my last answer to Daniel Megert in eclipse jdt
newsgroup:
Daniel, i've catched the problem.
It is the net.sf.servereclipse_0.1.2 plugin that
conflicts with org.eclipse.jdt.ui.PropertiesFileEditor.
Until WTP is ready it provides a nice
jsp/xml/properties syntax highlighter, but
unfortunately it defines a
org.eclipse.ui.editors.documentProviders extension
(net.sf.servereclipse.ui.jsp.internal.text.PropertiesDocumentProvider)
for properties files that, i guess, overrides the input
type expected by org.eclipse.jdt.ui.PropertiesFileEditor.
Commenting that provider extension in plugin.xml makes
everything working as expected.