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+ <header><h1>Known Pitfalls (FAQ)</h1></header>
+
+
+
+
+<div class="section">
+<h2><a name="Annotated_classes_in_dependencies_are_not_found."></a>Annotated classes in dependencies are not found.</h2>
+
+<p>
+ hibernate-maven-plugin by default scans dependencies in the scope
+ <tt>compile</tt>. You can configure it to scan dependencies in other
+ scopes as well. But it scans only direct dependencies. Transitive
+ dependencies are not scanned for annotated classes. If some of your
+ annotated classes are hidden in a transitive dependency, you can simply
+ add that dependency explicitly.
+ </p>
+ </div>
+<div class="section">
+<h2><a name="hibernate-maven-plugin_always_needs_a_database-connection"></a>hibernate-maven-plugin always needs a database-connection</h2>
+
+<p>
+ The default-configuration exports the created schema to the configured
+ database.
+ Therefore, it needs a valid database-connection and fails, if none is
+ available.
+ If you do not need to export the created schema to a database,
+ you can set the property <tt>hibernate.schema.export</tt> to
+ <tt>false</tt>.
+ This can be achieved with the command-line parameter
+ <tt>-Dhibernate.schema.export=false</tt> or with the following
+ configuration:
+ </p>
+
+<div>
+<pre class="prettyprint linenums lang-html">
+<configuration>
+ <export>false</export>
+</configuration></pre></div>
+
+<p>
+ But even when no database is to be created, hibernate always needs to know
+ the dialect. Hence, the plugin will still fail, if this parameter is also
+ missing!
+ </p>
+ </div>
+<div class="section">
+<h2><a name="Dependency_for_driver-class_XYZ_is_missing"></a>Dependency for driver-class XYZ is missing</h2>
+
+<p>
+ One regular problem is the scope of the jdbc-driver-dependency.
+ It is very unlikely, that this dependency is needed at compile-time.
+ So a tidy maven-developer would usually scope it for <tt>runtime</tt>.
+ </p>
+
+<p>
+ But this will break the execution of the <tt>hibernate-maven-plugin</tt>.
+ Since it will not be able to see the needed dependency, it will fail with
+ an error-message like:
+ </p>
+
+<div>
+<pre class="prettyprint">
+[INFO] Gathered hibernate-configuration (turn on debugging for details):
+[INFO] hibernate.connection.username = sa
+[INFO] hibernate.connection.password =
+[INFO] hibernate.dialect = org.hibernate.dialect.H2Dialect
+[INFO] hibernate.connection.url = jdbc:h2:file:./db
+[INFO] hibernate.hbm2dll.create_namespaces = false
+[INFO] hibernate.connection.driver_class = org.h2.Driver
+[INFO] hibernate.format_sql = true
+[INFO] HHH000412: Hibernate Core {5.0.2.Final}
+[INFO] HHH000206: hibernate.properties not found
+[INFO] HHH000021: Bytecode provider name : javassist
+[INFO] Adding /home/kai/project/target/classes to the list of roots to scan...
+[INFO] Adding dependencies from scope compile to the list of roots to scan
+[INFO] Adding dependencies from scope org.hibernate:hibernate-core:jar:4.3.0.Final to the list of roots to scan
+[INFO] Adding annotated resource: de.juplo.tests.SimplestMavenHib4Test
+[INFO] ------------------------------------------------------------------------
+[INFO] BUILD FAILURE
+[INFO] ------------------------------------------------------------------------
+[INFO] Total time: 1.760s
+[INFO] Finished at: Mon Mar 07 19:06:54 CET 2016
+[INFO] Final Memory: 11M/215M
+[INFO] ------------------------------------------------------------------------
+[ERROR] Failed to execute goal de.juplo:hibernate-maven-plugin:2.0.0:drop (default) on project hibernate4-properties-test: Could not open the JDBC-connection: Unable to load class [org.h2.Driver]: Could not load requested class : org.h2.Driver -> [Help 1]
+[ERROR]
+[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
+[ERROR] Re-run Maven using the -X switch to enable full debug logging.
+[ERROR]
+[ERROR] For more information about the errors and possible solutions, please read the following articles:
+[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException</pre></div>
+
+<p>
+ A quick workaround for this error would be, to delete the runtime-constraint
+ for the jdbc-driver-dependency.
+ </p>
+
+<p>
+ A much cleaner way is, to (additionally) ad the dependency, to the
+ plugin-definition:
+ </p>
+
+<div>
+<pre class="prettyprint linenums lang-html">
+<plugin>
+ <groupId>de.juplo</groupId>
+ <artifactId>hibernate-maven-plugin</artifactId>
+ <version>2.0.0</version>
+ <executions>
+ <execution>
+ <goals>
+ <goal>drop</goal>
+ <goal>create</goal>
+ </goals>
+ </execution>
+ </executions>
+ <dependencies>
+ <dependency>
+ <groupId>org.hsqldb</groupId>
+ <artifactId>hsqldb</artifactId>
+ <version>2.2.8</version>
+ </dependency>
+ </dependencies>
+</plugin></pre></div>
+
+<p>
+ This is also the best way, if you use a different jdbc-driver for
+ testing, than in production.
+ Because otherwise, this dependency will unnecessarily bloat the
+ runtime-dependencies of your project.
+ </p>
+ </div>
+<div class="section" id="fails">
+<h2 id="fails">DBUnit fails after execution of hibernate was skipped because nothing has changed</h2>
+
+<p>
+ If hibernate-maven-plugin skips its excecution, this may lead to errors in
+ other plugins.
+ For example, when importing sample-data in the automatically created database
+ with the help of the <a class="externalLink" href="http://mojo.codehaus.org/dbunit-maven-plugin/">dbunit-plugin</a>,
+ the <tt>CLEAN_INSERT</tt>-operation may fail because of foreign-key-constraints,
+ if the database was not recreated, because the hibernate-maven-plugin has
+ skipped its excecution.
+ </p>
+
+<p>
+ A quick fix to this problem is, to <a href="./force.html">force</a>
+ hibernate-maven-plugin to export the schema every time it is running.
+ But to recreate the database on every testrun may noticeable slow down your
+ development cycle, if you have to wait for slow IO.
+ </p>
+
+<p>
+ To circumvent this problem, hibernate-maven-plugin signals a skipped
+ excecution by setting the maven property <tt>${hibernate.schema.skipped}</tt> to
+ <tt>true</tt>.
+ You can configure other plugins to react on this signal.
+ For example, the dbunit-plugin can be configured to skip its excecution, if
+ hibernate-maven-plugin was skipped like this:
+ </p>
+
+<div>
+<pre class="prettyprint linenums lang-html">
+<plugin>
+ <groupId>org.codehaus.mojo</groupId>
+ <artifactId>dbunit-maven-plugin</artifactId>
+ <configuration>
+ <skip>${hibernate.schema.skipped}</skip>
+ </configuration>
+</plugin></pre></div>
+ </div>
+<div class="section">
+<h2><a name="The_database_will_not_be_recreated_after_a_manual_dropclean"></a>The database will not be recreated after a manual drop/clean</h2>
+
+<p>
+ If one manually drops the database or removes the hsqldb-files, it will not
+ be recreated by the hibernate-maven-plugin, because it cannot detect, that
+ the database needs to be recreated.
+ This happens, because the plugin will not recreate the database if neither
+ the configuration nor the annotated classes have changed, because an
+ unnecessary drop-create-cycle might take a long time. The plugin will
+ report that like this:
+ </p>
+
+<div>
+<pre class="prettyprint">
+[INFO] No modified annotated classes found and dialect unchanged.
+[INFO] Skipping schema generation!</pre></div>
+
+<p>
+ If one always uses <tt>mvn clean</tt> for cleanup, this will not happen.
+ Otherwise the recreation must be <a href="./force.html">forced</a>:
+ </p>
+
+<div>
+<pre class="prettyprint">
+mvn hibernate:create -Dhibernate.schema.force=true</pre></div>
+ </div>
+<div class="section">
+<h2><a name="The_hibernate:create_goal_is_not_executed_when_tests_are_skipped"></a>The hibernate:create goal is not executed, when tests are skipped</h2>
+
+<p>
+ The hibernate-maven-plugin automatically skips its execution, when
+ <tt>maven.test.skip</tt> is set to <tt>true</tt>. If you need it to be always
+ executed, you can configure that explicitly like this:
+ </p>
+
+<div>
+<pre class="prettyprint linenums lang-html">
+<plugin>
+ <groupId>de.juplo</groupId>
+ <artifactId>hibernate-maven-plugin</artifactId>
+ ...
+ <configuration>
+ <skip>false</skip>
+ </configuration>
+</plugin></pre></div>
+
+<p>
+ Background-information for this design-decission can be found on the extra
+ page <a href="./skip.html">To skip or not to skip: that is the question</a>...
+ </p>
+ </div>
+<div class="section">
+<h2><a name="I_do_not_want_my_dependencies_to_be_scanned_for_hibernate_annotations"></a>I do not want my dependencies to be scanned for hibernate annotations</h2>
+
+<p>
+ If you do not want your dependencies to be scanned for hibernate annotations,
+ you can pass <tt>-Dhibernate.schema.scan.dependencies=none</tt> to maven
+ or set <tt>scanDependencies</tt> to <tt>none</tt> in the configuration
+ of the plugin like this:
+ </p>
+
+<div>
+<pre class="prettyprint linenums lang-html">
+<plugin>
+ <groupId>de.juplo</groupId>
+ <artifactId>hibernate-maven-plugin</artifactId>
+ ...
+ <configuration>
+ <scanDependencies>none</scanDependencies>
+ </configuration>
+</plugin></pre></div>
+ </div>
+<div class="section">
+<h2><a name="No_annotated_classes_found"></a>No annotated classes found</h2>
+
+<p>
+ If you are working under Windows and get the error-message
+ <tt>No annotated classes found in directory C:\projects\X Y Z\path-to-project\target\classes</tt>,
+ but you are really sure, that there are annotated classes in that
+ directory, you are expiriencing a bug, in the scannotation-library, that
+ was closed in version 1.1.0 of the hibernate-maven-plugin.
+ </p>
+
+<p>
+ <b>
+ You should consider to upgrade to the latest version of the plugin.
+ </b>
+ </p>
+ </div>
+
+ </article>
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