I am getting the following exception when trying to create a one-to-many Parent/Child relationship based on the Parent/Child example in the Hibernate Reference Manual:
Code:
net.sf.hibernate.PropertyValueException: not-null property references a null or transient value: mdl.Child.parent
I am using XDoclet to create the mapping files (listed below), but they look the same as the one in the Hibernate Reference Manual.
What is wrong mith my mapping files? You can see from the Java code that I am explicitly setting the
Code:
parent
field of the Child to the actual reference to its Parent. Why does theexception say
not-null property references a null or transient value?
Thank you for your help.
Warmest regards, Matt
Hibernate version: 2.1.3Mapping documents: There are two, Parent.hbm.xml and Child.hbm.xmlParent.hbm.xmlCode:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class
name="mdl.Parent"
table="PARENT"
dynamic-update="false"
dynamic-insert="false"
>
<id
name="id"
column="PARENT_PK"
type="java.lang.Long"
>
<generator class="native">
</generator>
</id>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="PARENTNAME"
length="20"
not-null="true"
/>
<set
name="children"
lazy="true"
inverse="true"
cascade="all-delete-orphan"
sort="unsorted"
>
<key
column="PARENT_FK"
>
</key>
<one-to-many
class="mdl.Child"
/>
</set>
<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Parent.xml
containing the additional properties and place it in your merge dir.
-->
</class>
</hibernate-mapping>
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class
name="mdl.Child"
table="CHILD"
dynamic-update="false"
dynamic-insert="false"
>
<id
name="id"
column="CHILD_PK"
type="java.lang.Long"
>
<generator class="native">
</generator>
</id>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="CHILDNAME"
length="20"
not-null="true"
/>
<many-to-one
name="parent"
class="mdl.Parent"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="PARENT_FK"
not-null="true"
/>
<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-Child.xml
containing the additional properties and place it in your merge dir.
-->
</class>
</hibernate-mapping>
Code:
Parent parent = new Parent("Kerry");
Child child = new Child("Guzzi");
parent.addChild(child);
pm.save(parent);
pm.endSession();
// Keep id but lose reference to object.
Long id = parent.getId();
parent = null;
// Look it up again.
Parent new_parent = (Parent) pm.getById(Parent.class, id);
assertEquals("Kerry", new_parent.getName());
the full stack trace of any exception that occurs Code:
net.sf.hibernate.PropertyValueException: not-null property references a null or transient value: mdl.Child.parent
at net.sf.hibernate.impl.SessionImpl.checkNullability(SessionImpl.java:1269)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:921)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:850)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:768)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:731)
at net.sf.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:1380)
at net.sf.hibernate.engine.Cascades$4.cascade(Cascades.java:114)
at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:436)
at net.sf.hibernate.engine.Cascades.cascadeCollection(Cascades.java:526)
at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:452)
at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:503)
at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:482)
at net.sf.hibernate.impl.SessionImpl.preFlushEntities(SessionImpl.java:2664)
at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2239)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2228)
at persistence.hibernate.DefaultHibernateSessionFactory.endSession(Unknown Source)
at persistence.hibernate.HibernatePersistenceManager.endSession(Unknown Source)
at tests.persistence.hibernate.TestHibernatePersistenceManager.tearDown(Unknown Source)
at junit.framework.TestCase.runBare(TestCase.java:130)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:421)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:305)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:186)
the name and version of the databaseCode:
hsqldb-1.7.2.RC-6b.jar
a debug level Hibernate logCode:
18:59:51,501 INFO DriverManagerConnectionProvider:143 - cleaning up connection pool: jdbc:hsqldb:.
18:59:51,541 INFO Configuration:872 - configuring from resource: /hibernate.cfg.xml
18:59:51,551 INFO Configuration:844 - Configuration resource: /hibernate.cfg.xml
18:59:51,571 INFO Configuration:328 - Mapping resource: mdl/Parent.hbm.xml
18:59:51,611 INFO Binder:229 - Mapping class: mdl.Parent -> PARENT
18:59:51,631 INFO Configuration:328 - Mapping resource: mdl/Child.hbm.xml
18:59:51,681 INFO Binder:229 - Mapping class: mdl.Child -> CHILD
18:59:51,691 INFO Configuration:1030 - Configured SessionFactory: null
18:59:51,691 INFO Dialect:82 - Using dialect: net.sf.hibernate.dialect.HSQLDialect
18:59:51,701 INFO DriverManagerConnectionProvider:42 - Using Hibernate built-in connection pool (not for production use!)
18:59:51,701 INFO DriverManagerConnectionProvider:43 - Hibernate connection pool size: 1
18:59:51,701 INFO DriverManagerConnectionProvider:77 - using driver: org.hsqldb.jdbcDriver at URL: jdbc:hsqldb:.
18:59:51,711 INFO DriverManagerConnectionProvider:78 - connection properties: {user=sa}
18:59:51,711 INFO SchemaUpdate:102 - Running hbm2ddl schema update
18:59:51,711 INFO SchemaUpdate:110 - fetching database metadata
18:59:51,711 INFO SchemaUpdate:124 - updating schema
18:59:51,711 INFO Configuration:613 - processing one-to-many association mappings
18:59:51,711 INFO Binder:1168 - Mapping collection: mdl.Parent.children -> CHILD
18:59:51,711 INFO Configuration:622 - processing one-to-one association property references
18:59:51,721 INFO Configuration:647 - processing foreign key constraints
18:59:51,811 DEBUG SchemaUpdate:133 - create table PARENT (PARENT_PK BIGINT NOT NULL IDENTITY, PARENTNAME VARCHAR(20) not null)
18:59:51,821 ERROR SchemaUpdate:138 - Unsuccessful: create table PARENT (PARENT_PK BIGINT NOT NULL IDENTITY, PARENTNAME VARCHAR(20) not null)
18:59:51,821 ERROR SchemaUpdate:139 - Table already exists: PARENT in statement [create table PARENT]
18:59:51,821 DEBUG SchemaUpdate:133 - create table CHILD (CHILD_PK BIGINT NOT NULL IDENTITY, CHILDNAME VARCHAR(20) not null, PARENT_FK BIGINT not null)
18:59:51,821 ERROR SchemaUpdate:138 - Unsuccessful: create table CHILD (CHILD_PK BIGINT NOT NULL IDENTITY, CHILDNAME VARCHAR(20) not null, PARENT_FK BIGINT not null)
18:59:51,821 ERROR SchemaUpdate:139 - Table already exists: CHILD in statement [create table CHILD]
18:59:51,821 DEBUG SchemaUpdate:133 - alter table CHILD add constraint FK3D1FCFC217F387A foreign key (PARENT_FK) references PARENT
18:59:51,871 ERROR SchemaUpdate:138 - Unsuccessful: alter table CHILD add constraint FK3D1FCFC217F387A foreign key (PARENT_FK) references PARENT
18:59:51,881 ERROR SchemaUpdate:139 - Constraint already exists: FK3D1FCFC217F387A in statement [alter table CHILD add constraint FK3D1FCFC217F387A foreign key (PARENT_FK) references PARENT]
18:59:51,881 INFO SchemaUpdate:143 - schema update complete
18:59:51,881 INFO DriverManagerConnectionProvider:143 - cleaning up connection pool: jdbc:hsqldb:.
18:59:51,881 INFO Configuration:613 - processing one-to-many association mappings
18:59:51,881 INFO Configuration:622 - processing one-to-one association property references
18:59:51,881 INFO Configuration:647 - processing foreign key constraints
18:59:51,881 INFO Dialect:82 - Using dialect: net.sf.hibernate.dialect.HSQLDialect
18:59:51,881 INFO SettingsFactory:62 - Use outer join fetching: false
18:59:51,881 INFO DriverManagerConnectionProvider:42 - Using Hibernate built-in connection pool (not for production use!)
18:59:51,891 INFO DriverManagerConnectionProvider:43 - Hibernate connection pool size: 1
18:59:51,891 INFO DriverManagerConnectionProvider:77 - using driver: org.hsqldb.jdbcDriver at URL: jdbc:hsqldb:.
18:59:51,891 INFO DriverManagerConnectionProvider:78 - connection properties: {user=sa}
18:59:51,891 INFO DriverManagerConnectionProvider:143 - cleaning up connection pool: jdbc:hsqldb:.
18:59:51,891 INFO TransactionManagerLookupFactory:33 - No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommend
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