I encountered the following exception earlier today:
Unknown constant tag 32 in class file com/sun/org/apache/xerces/internal/impl/xs/XMLSchemaValidator <
Unknown constant tag 32 in class file com/sun/org/apache/xerces/internal/impl/xs/XMLSchemaValidator
Re-install your JVM
After first thinking it was something to do with dependencies, I quickly zeroed in on a corrupted file in my JDK installation. Re-installing immediately fixed it.