javax persistence PersistenceException No Persistence provider for EntityManager named customerManager

Question

I am new to JPA  amp  Hibernate  After reading some online materials I now understand what Hibernate is and how it can be used with JPA   Now  I am trying to run this JPA  amp  Hibernate tutorial  I ve done everything they mention in this tutorial   I don t have Oracle DB  only MySQL  So I made some changes to persistence xml using my understanding of JPA  amp  Hibernate  I don t know if it s correct or not    Seems to me it is    Here is my persistence xml   lt persistence xmlns  http   java sun com xml ns persistence  xmlns xsi  http   www w3 org 2001 XMLSchema-instance  xsi schemalocation  http   java sun com xml ns persistence http   java sun com xml ns persistence persistence 1 0 xsd  version  1 0  gt     lt persistence-unit name  customerManager  transaction-type  RESOURCE LOCAL  gt       lt provider gt org hibernate ejb HibernatePersistence lt  provider gt       lt class gt Customer lt  class gt       lt properties gt         lt property name  hibernate dialect  value  org hibernate dialect MySQLInnoDBDialect   gt         lt property name  hibernate connection driver class  value  com mysql jdbc Driver   gt         lt property name  hibernate show sql  value  true   gt         lt property name  hibernate connection username  value  root   gt         lt property name  hibernate connection password  value  1234   gt         lt property name  hibernate connection url  value  jdbc mysql   localhost 3306 general   gt         lt property name  hibernate max fetch depth  value  3   gt       lt  properties gt     lt  persistence-unit gt   lt  persistence gt    But I don t seem to get the output they describe  It s giving me   Customer id before creation null log4j WARN No appenders could be found for logger  org hibernate cfg annotations Version   log4j WARN Please initialize the log4j system properly  Exception in thread  main  javax persistence PersistenceException  No Persistence     provider for EntityManager named customerManager  at javax persistence Persistence createEntityManagerFactory Persistence java 55   at javax persistence Persistence createEntityManagerFactory Persistence java 33   at CustomerDAO create CustomerDAO java 8   at CustomerDAO main CustomerDAO java 22    Any suggestions will be appreciated   Update   I have made the changes that are asked to done  But  still getting the asme error lines     They didnt mentioned anything about orm xml in that tutorial  may it be a problem causer

User · Answer

my experience tells me that missing persistence.xml,will generate the same exception too.

i caught the same error msg today when i tried to run a jar package packed by ant.

when i used jar tvf to check the content of the jar file, i realized that "ant" forgot to pack the persistnece.xml for me.

after I manually repacked the jar file ,the error msg disappered.

so i believe maybe you should try simplely putting META-INF under src directory and placing your persistence.xml there.

User · Answer

If you are using Maven you may have both src  main test  resources META-INF persistence xml  This is a common setup  test your JPA code with h2 or Derby and deploy it with PostgreSQL or some other full DBMS  If you re using this pattern  do make sure the two files have different unit names  else some versions of the Persistence class will try to load BOTH  because of course your test-time CLASSPATH includes both classes and test-classes   this will cause conflicting definitions of the persistence unit  resulting in the dreaded annoying message that we all hate so much   Worse  this may  work  with some older versions of e g   Hibernate  but fail with current versions  Worth getting it right anyway

User · Answer

Just for completeness  There is another situation causing this error       missing META-INF services javax persistence spi PersistenceProvider   file    For Hibernate  it s located in hibernate-entitymanager-XXX jar  so  if hibernate-entitymanager-XXX jar is not in your classpath  you will got this error too   This error message is so misleading  and it costs me hours to get it correct   See JPA 2 0 using Hibernate as provider - Exception  No Persistence provider for EntityManager

User · Answer

I was also facing the same issue when I was trying to get JPA entity manager configured in Tomcat 8  First I has an issue with the SystemException class not being found and hence the entityManagerFactory was not being  created  I removed the hibernate entity manager dependency and then my entityManagerFactory was not able to lookup for the persistence provider  After going thru a lot of research and time got to know that hibernate entity manager is must to lookup for some configuration  Then put back the entity manager jar and then added JTA Api as a dependency and it worked fine

User · Answer

I was facing the same issue  I realised that I was using the Wrong provider class in persistence xml  For Hibernate it should be    lt provider gt org hibernate ejb HibernatePersistence lt  provider gt    And for EclipseLink it should be   lt provider gt org eclipse persistence jpa PersistenceProvider lt  provider gt

User · Answer

A bit too late but I got the same issue and fixed it switching schemalocation into schemaLocation in the persistence xml file  line 1

User · Answer

Your persistence xml is not valid and the EntityManagerFactory can t get created  It should be    lt persistence xmlns  http   java sun com xml ns persistence  xmlns xsi  http   www w3 org 2001 XMLSchema-instance  xsi schemalocation  http   java sun com xml ns persistence http   java sun com xml ns persistence persistence 1 0 xsd  version  1 0  gt     lt persistence-unit name  customerManager  transaction-type  RESOURCE LOCAL  gt       lt provider gt org hibernate ejb HibernatePersistence lt  provider gt       lt class gt Customer lt  class gt       lt properties gt         lt property name  hibernate dialect  value  org hibernate dialect MySQLInnoDBDialect   gt         lt property name  hibernate connection driver class  value  com mysql jdbc Driver   gt         lt property name  hibernate show sql  value  true   gt         lt property name  hibernate connection username  value  root   gt         lt property name  hibernate connection password  value  1234   gt         lt property name  hibernate connection url  value  jdbc mysql   localhost 3306 general   gt         lt property name  hibernate max fetch depth  value  3   gt       lt  properties gt     lt  persistence-unit gt   lt  persistence gt     Note how the  lt property gt  elements are closed  they shouldn t be nested   Update  I went through the tutorial and you will also have to change the Id generation strategy when using MySQL  as MySQL doesn t support sequences   I suggest using the AUTO strategy  defaults to IDENTITY with MySQL   To do so  remove the SequenceGenerator annotation and change the code like this    Entity  Table name  TAB CUSTOMER   public class Customer implements Serializable       private static final long serialVersionUID   1L        Id      GeneratedValue strategy GenerationType AUTO       Column name  CUSTOMER ID   precision 0      private Long customerId   null              This should help   PS  you should also provide a log4j properties as suggested

User · Answer

I had the same problem today  My persistence xml was in the wrong location  I had to put it in the following path   project src main resources META-INF persistence xml

User · Answer

I have seen this error   for me the issue was there was a space in the absolute path of the persistance xml   removal of the same helped me

User · Answer

If you use Hibernate 5 2 10 Final  you should change   lt provider gt org hibernate ejb HibernatePersistence lt  provider gt    to    lt provider gt org hibernate jpa HibernatePersistenceProvider lt  provider gt    in your persistence xml  According to Hibernate 5 2 2  No Persistence provider for EntityManager

[java] javax.persistence.PersistenceException: No Persistence provider for EntityManager named customerManager

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