Force execution

  The hibernate4-maven-plugin computes MD5-sums for all found annotated
  classes and stores them together with the generated schema.
  If no classes were changed or added and the dialect wasn't changed too, it
  automatically skips the configured schema-export, to speed up the development
  cycle.

  The plugin signals, that the execution was skipped by setting the maven
  property <<<${hibernate.export.skipped}>>> to <<<true>>>.
  This may be helpful, because other plugins like
  {{{http://mojo.codehaus.org/dbunit-maven-plugin/}dbunit-plugin}}
  {{{./pitfalls.html#fails}may fail}}, when the execution is skipped.

  If you need the hibernate4-maven-plugin to <never skip execution automatically>,
  you can force it to do so, if you set the parameter <<<force>>> to
  <<<true>>>:

----------------
<plugin>
  <groupId>de.juplo</groupId>
  <artifactId>hibernate4-maven-plugin</artifactId>
  <version>${project.version}</version>
  <configuration>
    <force>true</force>
  </configuration>
</plugin>
----------------

  Or you may specify <<<-Dhibernate.export.force=true>>> at the command line,
  if you want to force hibernate4-maven-plugin only once.