JPA: java.lang.IllegalArgumentException: Not an entity

Question

I wrote a simple Java that uses POJOs, servlets, JSPs. I am using:

Tomcat 7.0.16
Oracle 11g
Oracle Java build 1.6.0_26-b03

I use ivy to resolve my dependencies:

    <dependency org="oracle" name="ojdbc6" rev="11g" conf="default -> default" />

    <dependency org="org.hibernate" name="hibernate-commons-annotations" rev="3.2.0.Final" conf="compile -> runtime" />
    <dependency org="org.hibernate" name="hibernate-annotations" rev="3.5.6-Final" conf="default -> runtime" />
    <dependency org="org.hibernate" name="hibernate-core" rev="3.6.5.Final" conf="default -> runtime" />
    <dependency org="org.hibernate" name="hibernate-validator" rev="4.0.2.GA" conf="runtime -> runtime" />
    <dependency org="org.hibernate.javax.persistence" name="hibernate-jpa-2.0-api" rev="1.0.1.Final" conf="compile -> default" />
    <dependency org="org.hibernate" name="hibernate-entitymanager" rev="3.6.5.Final" conf="compile -> default" />

My POJO Vehicle contains the following annotations:

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Version;

@Entity
public class Vehicle implements Serializable{


    /**
     * 
     */
    private static final long serialVersionUID = 8560417193012227968L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long identifier;

    private String serialNumber;
    private String model;
    private String manufacturer;
    private int year;
    private String condition;

    @Version
    private long version;

    public Vehicle(){
    }

When I run my code, I get the following:

2013-10-28 11:40:50 ERROR SqlVehicleService:42 - java.lang.IllegalArgumentException: Not an entity: class com.foo.demos.car.model.Vehicle
java.lang.IllegalArgumentException: Not an entity: class com.foo.demos.car.model.Vehicle
    at org.hibernate.ejb.metamodel.MetamodelImpl.entity(MetamodelImpl.java:160)
    at org.hibernate.ejb.criteria.QueryStructure.from(QueryStructure.java:138)
    at org.hibernate.ejb.criteria.CriteriaQueryImpl.from(CriteriaQueryImpl.java:179)
    at com.foo.demos.car.impl.SqlVehicleService.getVehicles(SqlVehicleService.java:37)
    at org.apache.jsp.secured.vehicles_jsp._jspService(vehicles_jsp.java:194)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:572)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

My persistence.xml does not contain any information about Vehicle. My understanding is that annotations are enough. Is that correct?

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

 <persistence-unit name="cardemo">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
  <!-- the JNDI data source -->
  <non-jta-data-source>java:comp/env/jdbc/cardemo</non-jta-data-source>
  <properties>
 <property name="javax.persistence.validation.mode" value="NONE" />
   <!-- if this is true, hibernate will print (to stdout) the SQL it executes, 
    so you can check it to ensure it"s not doing anything crazy -->
   <property name="hibernate.show_sql" value="true" />
   <property name="hibernate.format_sql" value="true" />
   <!-- since most database servers have slightly different versions of the 
    SQL, Hibernate needs you to choose a dialect so it knows the subtleties of 
    talking to that server -->
   <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
   <!-- this tell Hibernate to update the DDL when it starts, very useful 
    for development, dangerous in production -->
   <property name="hibernate.hbm2ddl.auto" value="update" />
  </properties>
 </persistence-unit>
</persistence>

I obviously overlooked something. What's that? What am I missing?

score 25 · Accepted Answer · answered Oct 28 '13 at 10:55

25

My persistence.xml does not contain any information about Vehicle. My understanding is that annotations are enough. Is that correct?

No, it's not. The entities must be listed in the persistence.xml file, under the persistence-unit element:

<class>com.foo.demos.car.model.Vehicle</class>

answered Oct 28 '13 at 10:55

JB Nizet

678,734
91
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1,255

1

Not needed since Java EE 8. If I'm not mistaken. – Zon Apr 10 '19 at 08:44

score 2 · Answer 2 · edited May 23 '17 at 12:01

2

You need to give a hint to where the persistent entities can be found. I normally configure via Spring so don't have the exact info required however look here for some further discussion.

Do I need <class> elements in persistence.xml?

edited May 23 '17 at 12:01

Community

1
1

answered Oct 28 '13 at 10:57

Alan Hay

22,665
4
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110

score 2 · Answer 3 · answered Mar 09 '18 at 05:39

2

you can specify your entity locations via <property name="packagesToScan" value="" /> in the persistence.xml

answered Mar 09 '18 at 05:39

user8340242

21
3

1

Should be added as a comment rather than answer. – arqam Mar 09 '18 at 06:05

score 1 · Answer 4 · answered Dec 18 '19 at 18:02

My problem was that I created a SessionFactory like this:

        Configuration configuration = new Configuration();
        configuration.configure();

        serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);

instead of like this:

        Configuration configuration = new Configuration();
        configuration.configure();
        sessionFactory = configuration.buildSessionFactory();

When I replaced the former with the later, it worked! So be careful when using SessionFactory's initialization from tutorials.

Zon · Answer 5 · 2019-12-08T20:13:26.840

If you dynamically build your persistence and add properties, you can declare entity classes using 'org.reflections:reflections:0.9.11':

new HibernatePersistenceProvider()
        .createContainerEntityManagerFactory(
            new javax.persistence.spi.PersistenceUnitInfoImpl(persistenceUnitName),
            ImmutableMap.<String, Object>builder()
                .put(AvailableSettings.LOADED_CLASSES, getEntities())
                .build());

...


private List<Class<?>> getEntities() {

  Set<Class<?>> entitiesInPackage = new Reflections("rf.dom.model")
    .getTypesAnnotatedWith(Entity.class); // Annotated @Entity

  List entities = new ArrayList<>(entitiesInPackage);

  return entities;
}

score 0 · Answer 6 · answered Oct 24 '21 at 07:20

0

Add packages-to-scan entry in your yml file.

jpa:
  default:
    packages-to-scan:
      - 'com.foo.demos.car.model'
      - 'your.entity.package.name'

answered Oct 24 '21 at 07:20

2787184

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JPA: java.lang.IllegalArgumentException: Not an entity

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