Eclipse JDT breaks XSP!

[Stefano Mazzocchi]

I've been randomly experiencing empty XSP pages and the following 
stacktrace being sent to stderr

java.lang.ExceptionInInitializerError: corrupted file parser2.rsc
        at 
org.eclipse.jdt.internal.compiler.parser.Parser.<clinit>(Parser.java:364)
        at 
org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:113)
        at 
org.apache.cocoon.components.language.programming.java.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:441)

does anybody know what's wrong?

Stefano.