Eclipse does not recognize content of persistence.xml

Question

Im getting the following error in eclipse:

The persistence.xml file does not have recognized content.

My persistence.xml file works great in my application but e

Answer 1

Ok ... another rather robust solution that worked for me since the top-most ones did not:

• since I used Mercurial and could go back easily without any notable differences in the current and last versions it worked this way:

• (committed some important changes rather unrelated to this problem)

• switching to previous repo version
• (auto-/refresh/-rebuild ran fine)

What I recognized was, that the problem may have been due to the fact that the Java Builder did not generate my war/WEB-INF/classes/ files. The following did not work to follow this trail in letting it build my project:

• disabling/reconfiguring Validators, Builders, Facets (till only the Java Builder/Facet was there)
• renaming the persistence.xml or editing it in various ways

which did not help it as if some internal state could not be changed.