How to persist "Set<String>" with Java Persistence API ?
Hello, I am using the EBJ 3.0 specs with JEE5.
I want to persist an @Entity that contains a field "Set<String> phoneNumbers;" but I get errors during the verification of the program by the Application Server of Sun and also by the verifier tool in netbeans 5.5.
I saw that if I make the String become a "@Entity PhoneNumber", then I can persist it without any problem.
My question is : Do I need to create an Entity for each type of field that have a relation @OneToMany or @ManyToMany with my current @Entities, even if they are basic types (e.g. List<Integer>, Set<String>, Collection<Boolean>, etc ...) ? If there is any trick to avoid to explicitly make a different class with an entity, I would be really happy to hear how.
[777 byte] By [
karmaGfaa] at [2007-10-2 23:44:07]
Following your advice, I tried but it doesn't work, I get an exception, always the same :
java.lang.StringIndexOutOfBoundsException: String index out of range: 3
at java.lang.String.substring(String.java:1765)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataHelper.getAttributeNameFromMethodName(MetadataHelper.java:99)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataDescriptor.getAccessorFor(MetadataDescriptor.java:317)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.processMapKey(MetadataProcessor.java:1295)
at oracle.toplink.essentials.internal.ejb.cmp3.annotations.EJBAnnotationsProcessor.processMapKey(EJBAnnotationsProcessor.java:1327)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.populateCollectionMapping(MetadataProcessor.java:467)
at oracle.toplink.essentials.internal.ejb.cmp3.annotations.EJBAnnotationsProcessor.populateCollectionMapping(EJBAnnotationsProcessor.java:484)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.processOneToMany(MetadataProcessor.java:1333)
at oracle.toplink.essentials.internal.ejb.cmp3.annotations.EJBAnnotationsProcessor.processOneToMany(EJBAnnotationsProcessor.java:1487)
at oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataProcessor.processRelationshipAccessor(MetadataProcessor.java:1643)
at oracle.toplink.essentials.internal.ejb.cmp3.annotations.EJBAnnotationsProcessor.processRelatedEntity(EJBAnnotationsProcessor.java:1786)
at oracle.toplink.essentials.internal.ejb.cmp3.annotations.EJBAnnotationsProcessor.processORAnnotations(EJBAnnotationsProcessor.java:1543)
at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:405)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createContainerEntityManagerFactory(EntityManagerFactoryProvider.java:156)
at com.sun.enterprise.tools.verifier.tests.persistence.DefaultProviderVerification.check(DefaultProviderVerification.java:80)
at com.sun.enterprise.tools.verifier.CheckMgr.check(CheckMgr.java:120)
at com.sun.enterprise.tools.verifier.persistence.PersistenceUnitCheckMgrImpl.check(PersistenceUnitCheckMgrImpl.java:83)
at com.sun.enterprise.tools.verifier.CheckMgr.checkPersistenceUnits(CheckMgr.java:377)
at com.sun.enterprise.tools.verifier.ejb.EjbCheckMgrImpl.check(EjbCheckMgrImpl.java:67)
at com.sun.enterprise.tools.verifier.BaseVerifier.verify(BaseVerifier.java:133)
at com.sun.enterprise.tools.verifier.ejb.EjbVerifier.verify(EjbVerifier.java:65)
at com.sun.enterprise.tools.verifier.VerificationHandler.runVerifier(VerificationHandler.java:223)
at com.sun.enterprise.tools.verifier.VerificationHandler.verifyArchive(VerificationHandler.java:128)
at com.sun.enterprise.tools.verifier.Verifier.verify(Verifier.java:131)
at com.sun.enterprise.tools.verifier.Verifier.main(Verifier.java:101)
Is it my program that is not right or is it a bug of the persistence CMP ?
That depends how you expect Set<String> become stored:
1. Another Table with relationship.
You must write other Entity.
2. Varchar: value1, value2.
Create another getter:
@Column
public String getValue() {
String str;
// construct string from Set<String>
return str;
}
Methods related with Set<String> become @Transient.
I hope this help you.
Message was edited by:
Rulas
Rulasa at 2007-7-14 16:28:09 >
