title: Persistence unit not resolved Maven project with Glassfish 4 and Netbeans 7.4
body: <p>I created a Maven web project using Glassfish 4 and Netbeans 7.4.</p>
  
  <p>This is my pom.xml :</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  
      &lt;groupId&gt;com.myproject&lt;/groupId&gt;
      &lt;artifactId&gt;Myproject&lt;/artifactId&gt;
      &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt;
      &lt;packaging&gt;war&lt;/packaging&gt;
  
      &lt;name&gt;Myproject&lt;/name&gt;
  
      &lt;properties&gt;
          &lt;endorsed.dir&gt;${project.build.directory}/endorsed&lt;/endorsed.dir&gt;
          &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
      &lt;/properties&gt;
  
      &lt;repositories&gt;
          &lt;repository&gt;
              &lt;id&gt;oss.sonatype.org&lt;/id&gt;
              &lt;name&gt;OSS Sonatype Staging&lt;/name&gt;
              &lt;url&gt;https://oss.sonatype.org/content/groups/staging&lt;/url&gt;
          &lt;/repository&gt;
      &lt;/repositories&gt;
  
      &lt;dependencies&gt;
          &lt;dependency&gt;
                  &lt;groupId&gt;org.eclipse.persistence&lt;/groupId&gt;
                  &lt;artifactId&gt;eclipselink&lt;/artifactId&gt;
          &lt;version&gt;2.5.0-RC1&lt;/version&gt;
          &lt;exclusions&gt;
                  &lt;exclusion&gt;
          &lt;groupId&gt;org.eclipse.persistence&lt;/groupId&gt;
          &lt;artifactId&gt;commonj.sdo&lt;/artifactId&gt;
                  &lt;/exclusion&gt;
          &lt;/exclusions&gt;
      &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.glassfish.extras&lt;/groupId&gt;
              &lt;artifactId&gt;glassfish-embedded-all&lt;/artifactId&gt;
              &lt;version&gt;3.0&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;javax&lt;/groupId&gt;
              &lt;artifactId&gt;javaee-web-api&lt;/artifactId&gt;
              &lt;version&gt;7.0&lt;/version&gt;
              &lt;scope&gt;provided&lt;/scope&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;javax.faces&lt;/groupId&gt;
              &lt;artifactId&gt;jsf-api&lt;/artifactId&gt;
              &lt;version&gt;2.1&lt;/version&gt;
              &lt;scope&gt;provided&lt;/scope&gt;
          &lt;/dependency&gt;
      &lt;/dependencies&gt;
  
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                  &lt;version&gt;3.1&lt;/version&gt;
                  &lt;configuration&gt;
                      &lt;source&gt;1.7&lt;/source&gt;
                      &lt;target&gt;1.7&lt;/target&gt;
                      &lt;compilerArguments&gt;
                          &lt;endorseddirs&gt;${endorsed.dir}&lt;/endorseddirs&gt;
                      &lt;/compilerArguments&gt;
                  &lt;/configuration&gt;
              &lt;/plugin&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-war-plugin&lt;/artifactId&gt;
                  &lt;version&gt;2.3&lt;/version&gt;
                  &lt;configuration&gt;
                      &lt;failOnMissingWebXml&gt;false&lt;/failOnMissingWebXml&gt;
                  &lt;/configuration&gt;
              &lt;/plugin&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-dependency-plugin&lt;/artifactId&gt;
                  &lt;version&gt;2.6&lt;/version&gt;
                  &lt;executions&gt;
                      &lt;execution&gt;
                          &lt;phase&gt;validate&lt;/phase&gt;
                          &lt;goals&gt;
                              &lt;goal&gt;copy&lt;/goal&gt;
                          &lt;/goals&gt;
                          &lt;configuration&gt;
                              &lt;outputDirectory&gt;${endorsed.dir}&lt;/outputDirectory&gt;
                              &lt;silent&gt;true&lt;/silent&gt;
                              &lt;artifactItems&gt;
                                  &lt;artifactItem&gt;
                                      &lt;groupId&gt;javax&lt;/groupId&gt;
                                      &lt;artifactId&gt;javaee-endorsed-api&lt;/artifactId&gt;
                                      &lt;version&gt;7.0&lt;/version&gt;
                                      &lt;type&gt;jar&lt;/type&gt;
                                  &lt;/artifactItem&gt;
                              &lt;/artifactItems&gt;
                          &lt;/configuration&gt;
                      &lt;/execution&gt;
                  &lt;/executions&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  
  &lt;/project&gt;
  </code></pre>
  
  <p>I created the JDBC resource and pool with only one user : "root" and no password.
  This is my persistence.xml :</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"&gt;
    &lt;persistence-unit name="com.Myproject_war_1.0-SNAPSHOTPU" transaction-type="JTA"&gt;
      &lt;provider&gt;org.eclipse.persistence.jpa.PersistenceProvider&lt;/provider&gt;
      &lt;jta-data-source&gt;jdbc/myprojectjdbc&lt;/jta-data-source&gt;
      &lt;class&gt;com.myproject.entity.Board&lt;/class&gt;
      &lt;class&gt;com.myproject.entity.Category&lt;/class&gt;
      &lt;class&gt;com.myproject.entity.Message&lt;/class&gt;
      &lt;class&gt;com.myproject.entity.Myuser&lt;/class&gt;
      &lt;class&gt;com.myproject.entity.Topic&lt;/class&gt;
      &lt;exclude-unlisted-classes&gt;true&lt;/exclude-unlisted-classes&gt;
      &lt;properties&gt;
        &lt;property name="javax.persistence.jdbc.user" value="root"/&gt;
        &lt;property name="javax.persistence.jdbc.password" value=""/&gt;
        &lt;property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/&gt;
      &lt;/properties&gt;
    &lt;/persistence-unit&gt;
  &lt;/persistence&gt;
  </code></pre>
  
  <p>And this is my server log error when I deploy :</p>
  
  <pre><code>[2014-03-26T14:36:35.057+0100] [glassfish 4.0] [SEVERE] [] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1395840995057] [levelValue: 1000] [[
    Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method]]
  [2014-03-26T14:36:35.057+0100] [glassfish 4.0] [SEVERE] [] [] [tid: _ThreadID=34 _ThreadName=Thread-4] [timeMillis: 1395840995057] [levelValue: 1000] [[
    java.lang.RuntimeException: Could not resolve a persistence unit corresponding to the persistence-context-ref-name [com.sun.ejb.containers.TimerBean/em] in the scope of the module called [Myproject]. Please verify your application.
      at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUViaEMRef(BundleDescriptor.java:727)
      at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUsViaPCRefs(BundleDescriptor.java:715)
      at org.glassfish.web.deployment.descriptor.WebBundleDescriptorImpl.findReferencedPUs(WebBundleDescriptorImpl.java:996)
      at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:186)
      at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:922)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:431)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
      at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:527)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:523)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAs(Subject.java:356)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:522)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1500(CommandRunnerImpl.java:108)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
      at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
      at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
      at org.glassfish.grizzly.http.server.StaticHttpHandler.service(StaticHttpHandler.java:297)
      at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
      at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
      at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
      at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
      at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
      at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
      at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
      at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
      at java.lang.Thread.run(Thread.java:744)]]
  [2014-03-26T14:36:35.058+0100] [glassfish 4.0] [SEVERE] [] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1395840995058] [levelValue: 1000] [[
    Exception while preparing the app]]
  [2014-03-26T14:36:35.058+0100] [glassfish 4.0] [SEVERE] [NCLS-CORE-00026] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1395840995058] [levelValue: 1000] [[
    Exception during lifecycle processing
  java.lang.RuntimeException: Could not resolve a persistence unit corresponding to the persistence-context-ref-name [com.sun.ejb.containers.TimerBean/em] in the scope of the module called [Myproject]. Please verify your application.
      at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUViaEMRef(BundleDescriptor.java:727)
      at com.sun.enterprise.deployment.BundleDescriptor.findReferencedPUsViaPCRefs(BundleDescriptor.java:715)
      at org.glassfish.web.deployment.descriptor.WebBundleDescriptorImpl.findReferencedPUs(WebBundleDescriptorImpl.java:996)
      at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:186)
      at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:922)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:431)
      at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
      at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:527)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:523)
      at java.security.AccessController.doPrivileged(Native Method)
      at javax.security.auth.Subject.doAs(Subject.java:356)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:522)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:546)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1423)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1500(CommandRunnerImpl.java:108)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1762)
      at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1674)
      at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
      at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
      at org.glassfish.grizzly.http.server.StaticHttpHandler.service(StaticHttpHandler.java:297)
      at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:246)
      at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
      at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
      at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
      at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
      at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
      at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
      at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
      at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
      at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
      at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
      at java.lang.Thread.run(Thread.java:744)
  ]]
  [2014-03-26T14:36:35.069+0100] [glassfish 4.0] [SEVERE] [] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1395840995069] [levelValue: 1000] [[
    Exception while preparing the app : Could not resolve a persistence unit corresponding to the persistence-context-ref-name [com.sun.ejb.containers.TimerBean/em] in the scope of the module called [Myproject]. Please verify your application.]]
  </code></pre>