Javadoc
Merge web meta data, according to the merging rules specified by the Servlet 3.0
specification. This is a special type of merging, where non conflicting meta data
augment existing meta data, rather than overriding it.
If there is a conflict when merging the fragment meta data, and the main
webMetaData does not resolve the conflict, an error will be thrown or the
conflict will be resolved in favor of this object, depending on the value of the resolve flag.