Hibernate unknown entity error when saving new object

Question

    Student s = (Student) db.getByID(Student.class,1);
    s.setFirstName("Preston");
    db.saveOrUpdate(s); <--Successful save
    s = new Student(){{setFirstName("asdf");setLastName("asdf1");}};
    s.setSchool((School) db.getByID(School.class, 1));
    db.saveOrUpdate(s); <--Error occurs

Exception in thread "main" org.hibernate.MappingException: Unknown entity: project.databaseio.TestClass$1

public void saveOrUpdate(Object object)
{
    Transaction  tx = sessionFactory.getCurrentSession().beginTransaction();
    sessionFactory.getCurrentSession().saveOrUpdate(object);
    tx.commit();
}

Stack Trace

Exception in thread "main" org.hibernate.MappingException: Unknown entity: project.databaseio.TestClass$1
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:548)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:180)
at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:487)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:84)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at com.sun.proxy.$Proxy0.saveOrUpdate(Unknown Source)
at project.databaseio.DatabaseConnection.saveOrUpdate(DatabaseConnection.java:117)
at project.databaseio.TestClass.main(TestClass.java:21)

Hibernate Config for Student

<hibernate-mapping>
    <class name="project.databaseio.Student" table="Student" catalog="fblaem">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="identity" />
        </id>
        <many-to-one name="school" class="project.databaseio.School" fetch="select">
            <column name="SchoolID" not-null="true" />
        </many-to-one>
        <property name="firstName" type="string">
            <column name="FirstName" not-null="true" />
        </property>
        <property name="lastName" type="string">
            <column name="LastName" not-null="true" />
        </property>
        <property name="middleName" type="string">
            <column name="MiddleName" />
        </property>
        <property name="createDate" type="timestamp">
            <column name="CreateDate" length="0" />
        </property>
        <set name="studentEventTeams" table="StudentEventTeam" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="StudentID" not-null="true" />
            </key>
            <one-to-many class="project.databaseio.StudentEventTeam" />
        </set>
    </class>
</hibernate-mapping>

Please post stack trace

kark
– kark

2013-11-07 04:36:45 +00:00
Commented Nov 7, 2013 at 4:36 — kark
– kark, Commented Nov 7, 2013 at 4:36
@kark posted (not enough chars)

Preston
– Preston

2013-11-07 04:38:45 +00:00
Commented Nov 7, 2013 at 4:38 — Preston
– Preston, Commented Nov 7, 2013 at 4:38

Ean V · Accepted Answer · 2013-11-07 06:19:50Z

5

The problem is coming from the following line:

s = new Student(){{setFirstName("asdf");setLastName("asdf1");}};

Briefly this line is creating a new instance of an inner class which implicitly inherits from Student class. This class is named TestClass$1 by Java's compiler and because there is no mapping for that, Hibernate is complaining about it. What you need to do is:

s = new Student();
s.setFirstName("blah");
s.setLastName("blah2");
s.setSchool((School) db.getByID(School.class, 1));

answered Nov 7, 2013 at 6:19

Ean V

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1 Comment

Preston Over a year ago

That's the ticket, thank you! FYI, TestClass is the name of the class all this was being ran inside of. So that's there that came from and the $1 was tacked on by jvm. Thanks.

Juned Ahsan · Accepted Answer · 2013-11-07 04:37:32Z

0

The declaration of your entity Student seems to be incorrect. If you are using annotations then properly annotate your class @javax.persistence.Entity annotaton.

answered Nov 7, 2013 at 4:37

Juned Ahsan

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4 Comments

Preston Over a year ago

I'm sorry, what class? I'm not sure if you're asking me to annotate the variable "s" or the actual Student class or the testclass I'm using?

Juned Ahsan Over a year ago

@Preston Student class

Preston Over a year ago

Added "@Entity public class Student {" as per docs here docs.jboss.org/hibernate/annotations/3.5/reference/en/html/… Also tried it with @javax.persistence.Entity which is the same. It still throws the error, shouldn't this annotation be taken care of by the hbm config files for each entity?

Ean V Over a year ago

You don't need annotations as you are using hbm.

Kalyan · Accepted Answer · 2015-11-03 19:39:25Z

0

I ran into similar problem, where my eclipse has got version problem with java and it couldnt build the code so when i added the new entity entry in my hibernate.cfg.xml it did not refresh the old one and hence when hibernate is trying to look for entity it couldnt get it.

I resolved it by deleting the old hibernate.cfg.xml in my bin location of the workspace and then pasted the new hibernate.cfg.xml and bingo it worked..

answered Nov 3, 2015 at 19:39

Kalyan

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