# Unable to locate persistence units

**URL:** <https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473>\
**Category:** Hibernate ORM\
**Created:** [June 22, 2021, 10:50am UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473 "2021-06-22T10:50:48Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Cezar](https://avatars.discourse-cdn.com/v4/letter/c/dc4da7/32.png) [@Cezar](https://discourse.hibernate.org/u/Cezar)\
**Post date:** [June 22, 2021, 10:50am UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/1 "2021-06-22T10:50:48Z")

</div>

I don’t understand my persistence file was generated by Netbeans. I have compared with others persistence file in web and I not saw difference I know that this error “Unable to locate persistence units” are in my persistence file but I can’t see where.  
Error log:

```auto
javax.persistence.PersistenceException: Unable to locate persistence units
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:85)
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:61)
	at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:50)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
	at itc.systems.itcsystemsdemoweb.Cadastro_Pacientes_JPA01.doPost(Cadastro_Pacientes_JPA01.java:56)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:791)
	at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:380)
	at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:130)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:102)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: javax.persistence.PersistenceException: Invalid persistence.xml.
Error parsing XML [line : -1, column : -1] : cvc-elt.1.a: Cannot find the declaration of element 'persistence'.

	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.validate(PersistenceXmlParser.java:494)
	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.loadUrl(PersistenceXmlParser.java:446)
	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:249)
	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.parsePersistenceXml(PersistenceXmlParser.java:240)
	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.doResolve(PersistenceXmlParser.java:234)
	at org.hibernate.jpa.boot.internal.PersistenceXmlParser.locatePersistenceUnits(PersistenceXmlParser.java:68)
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:81)
	... 45 more

```

```auto
My persistence:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2" 
             xmlns="http://java.sun.com/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_2.xsd">
  <persistence-unit name="ITCSystems" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <properties>
        <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"></property>
        <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/db_demonstracao"></property>
        <property name="javax.persistence.jdbc.user" value="root"></property>
        <property name="javax.persistence.jdbc.password" value="cezar2017"></property>
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL8Dialect"></property>
        <property name="hibernate.show_sql" value="true"></property>
        <property name="hibernate.format_sql" value="true"></property>
        <property name="hibernate.hbm2ddl.auto" value="update"></property>
    </properties>
  </persistence-unit>
</persistence>

```

---

<div class="post-metadata">

**Author:** ![boutss](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/boutss/32/1543_2.png) [@boutss](https://discourse.hibernate.org/u/boutss)\
**Post date:** [June 22, 2021, 12:59pm UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/2 "2021-06-22T12:59:32Z")

</div>

It is a priori a problem of parsing. See below.

maybe delete that

```auto
<?xml version="1.0" encoding="UTF-8"?>

```

To make sure that hibernate points to this one, modify the file to get another error.

> [@Cezar](#):
>
> ```auto
> Caused by: javax.persistence.PersistenceException: Invalid persistence.xml.
> Error parsing XML [line : -1, column : -1] : cvc-elt.1.a: Cannot find the declaration of element 'persistence'.
> 
> ```

---

<div class="post-metadata">

**Author:** ![beikov](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/beikov/32/258_2.png) [@beikov](https://discourse.hibernate.org/u/beikov)\
**Post date:** [June 22, 2021, 3:10pm UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/3 "2021-06-22T15:10:45Z")

</div>

The `xmlns` is wrong. It should be `xmlns="http://xmlns.jcp.org/xml/ns/persistence"`

---

<div class="post-metadata">

**Author:** ![boutss](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/boutss/32/1543_2.png) [@boutss](https://discourse.hibernate.org/u/boutss)\
**Post date:** [June 22, 2021, 3:19pm UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/4 "2021-06-22T15:19:26Z")

</div>

Yet I checked on one of mine, my eyes were not in front of the holes … 🧐

```auto
<persistence version="2.2"
             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_2.xsd">

```

---

<div class="post-metadata">

**Author:** ![Cezar](https://avatars.discourse-cdn.com/v4/letter/c/dc4da7/32.png) [@Cezar](https://discourse.hibernate.org/u/Cezar)\
**Post date:** [June 22, 2021, 5:31pm UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/5 "2021-06-22T17:31:00Z")

</div>

New error after the change.

```auto
java.lang.IllegalStateException: Transaction not successfully started
	at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:95)
	at itc.systems.itcsystemsdemoweb.Cadastro_Pacientes_JPA01.doPost(Cadastro_Pacientes_JPA01.java:98)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
	at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:791)
	at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:380)
	at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:130)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:102)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:832)

```

---

<div class="post-metadata">

**Author:** ![Cezar](https://avatars.discourse-cdn.com/v4/letter/c/dc4da7/32.png) [@Cezar](https://discourse.hibernate.org/u/Cezar)\
**Post date:** [June 23, 2021, 3:27pm UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/6 "2021-06-23T15:27:15Z")

</div>

Hi guys, very very good the problem was solved after change the persistence file as you told me.  
Thanks and best regards.

---

<div class="post-metadata">

**Author:** ![beikov](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/beikov/32/258_2.png) [@beikov](https://discourse.hibernate.org/u/beikov)\
**Post date:** [June 24, 2021, 7:13am UTC](https://discourse.hibernate.org/t/unable-to-locate-persistence-units/5473/7 "2021-06-24T07:13:04Z")

</div>

Seems you didn’t start the transaction before calling commit, but that’s a different error.