title: shema recognition problem with data persistance object-mapping JDO vendor for first tutorial problem (mysql)
body: <p>description of the error:
  while testing the tutorial of jdo implementation of JDO from datanucleus.org (code is from github <a href="https://github.com/datanucleus/samples-jdo/tree/master/tutorial" rel="nofollow noreferrer">enter code here</a>
  and the chosen datastore for test is mysql and I have created the database
  with [href=&quot;https://github.com/tournesol59/javatutorials/blob/main/tutorial/sql_mydb_create_table.sql&quot;][3]
  script, I encounter errors.
  As I understood from the log below, the enhance operation of the POJO classes was completed but
  the enhancer module encountered an error, which may be related to the shema
  definition of the persistance. This is why I have run the enhancer command two
  times: a first time without the created database and a second time with the
  matching database and the error output are the same. I copy it one time:</p>
  <p>Caused by: org.apache.maven.plugin.MojoExecutionException: The DataNucleus tool org.datanucleus.enhancer.DataNucleusEnhancer exited with a non-null exit code.</p>
  <pre><code>[INFO] DataNucleus Enhancer (version 6.0.0.release) for API &quot;JDO&quot; DataNucleus Enhancer completed with success for 3 classes.
  
  [ERROR] -------------------- [ERROR]  Standard error from the DataNucleus tool + org.datanucleus.enhancer.DataNucleusEnhancer : [ERROR] -------------------- [ERROR] Le chemin d'acc?s sp?cifi? est introuvable.
  
  [ERROR] -------------------- [INFO]
  ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO]
  ------------------------------------------------------------------------ [INFO] Total time:  4.230 s [INFO] Finished at: 2022-08-11T20:54:04+02:00 [INFO]
  ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.datanucleus:datanucleus-maven-plugin:6.0.0-release:enhance (default) on project datanucleus-samples-jdo-tutorial: The DataNucleus tool org.datanucleus.enhancer.DataNucleusEnhancer exited with a non-null exit code. -&gt; [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.datanucleus:datanucleus-maven-plugin:6.0.0-release:enhance (default) on project datanucleus-samples-jdo-tutorial: The DataNucleus tool org.datanucleus.enhancer.DataNucleusEnhancer exited with a non-null exit code.
      at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:375)
      at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:351)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:171)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:163)
      at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
      at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
      at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
      at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
      at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
      at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
      at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
      at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
      at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
      at java.lang.reflect.Method.invoke (Method.java:577)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347) Caused by: org.apache.maven.plugin.MojoExecutionException: The DataNucleus tool org.datanucleus.enhancer.DataNucleusEnhancer exited with a non-null exit code.
      at org.datanucleus.maven.AbstractDataNucleusMojo.executeCommandLine (AbstractDataNucleusMojo.java:312)
  </code></pre>
  <p>I have found a mailing list from datanucleus but did not found anything in the archive related to the first tutorial. The project seems well involved in other datastore (Google, MongoDB...) architectures. Has anyone experienced it with mysql?</p>