[ https://issues.apache.org/jira/browse/OPENJPA-218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489418 ] 

Markus Wolf commented on OPENJPA-218:
-------------------------------------

To be more complete I'll attach the NPE stacktrace:

java.lang.NullPointerException
	at de.esw.services.model.DomainRecord.pcCopyKeyFieldsFromObjectId(DomainRecord.java)
	at de.esw.services.model.DomainRecord.pcNewInstance(DomainRecord.java)
	at org.apache.openjpa.kernel.AttachStrategy.persist(AttachStrategy.java:89)
	at org.apache.openjpa.kernel.VersionAttachStrategy.attach(VersionAttachStrategy.java:85)
	at org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:236)
	at org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:97)
	at org.apache.openjpa.kernel.BrokerImpl.attach(BrokerImpl.java:3124)
	at org.apache.openjpa.kernel.DelegatingBroker.attach(DelegatingBroker.java:1120)
	at org.apache.openjpa.persistence.EntityManagerImpl.merge(EntityManagerImpl.java:591)
	at org.springframework.orm.jpa.JpaTemplate$6.doInJpa(JpaTemplate.java:272)
	at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:191)
	at org.springframework.orm.jpa.JpaTemplate.merge(JpaTemplate.java:270)
	at de.esw.services.domain.DomainRecordProcessorImpl.update(DomainRecordProcessorImpl.java:53)

> pcNewInstance and ApplicationId
> -------------------------------
>
>                 Key: OPENJPA-218
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-218
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 0.9.6, 0.9.7
>         Environment: Java 6
>            Reporter: Markus Wolf
>
> When using an application id class containing a reference to another entity (example given below) a NPE is thrown when merging/reattaching the instance to an entity manager. 
> The problem is caused by the involved AttachStrategy where on line 89 (pc.pcNewInstance(null, appId, false);) the call to pcNewInstance is null for the first parameter (StateManager). This statemanager is used to retrieve the object reference when reattaching using the method pcCopyKeyFieldsFromObjectId in the pcNewInstance method.
> Source for this bug:
> @Entity
> @Table(name = "domain_record")
> @IdClass(DomainRecord.DomainRecordId.class)
> public class DomainRecord implements Serializable {
> 	private static final long serialVersionUID = 2966781630801201103L;
> 	public static class DomainRecordId implements Serializable {
> 		private static final long serialVersionUID = 3629556841694516032L;
> 		private String zone;
> 		private String name;
> 		private Type type;
> 		private String data;
> 		public DomainRecordId() {
> 		}
> 		public DomainRecordId(DomainRecord record) {
> 			this.zone = record.zone.getName();
> 			this.name = record.name;
> 			this.type = record.type;
> 			this.data = record.data;
> 		}
> 		public DomainRecordId(String zone, String name, Type type, String data) {
> 			this.zone = zone;
> 			this.name = name;
> 			this.type = type;
> 			this.data = data;
> 		}
> 		/**
> 		 * @see java.lang.Object#hashCode()
> 		 */
> 		@Override
> 		public int hashCode() {
> 			final int PRIME = 31;
> 			int result = 1;
> 			result = PRIME * result + ((data == null) ? 0 : data.hashCode());
> 			result = PRIME * result + ((name == null) ? 0 : name.hashCode());
> 			result = PRIME * result + ((type == null) ? 0 : type.hashCode());
> 			result = PRIME * result + ((zone == null) ? 0 : zone.hashCode());
> 			return result;
> 		}
> 		/**
> 		 * @see java.lang.Object#equals(java.lang.Object)
> 		 */
> 		@Override
> 		public boolean equals(Object obj) {
> 			if (this == obj)
> 				return true;
> 			if (obj == null)
> 				return false;
> 			if (getClass() != obj.getClass())
> 				return false;
> 			final DomainRecordId other = (DomainRecordId) obj;
> 			if (data == null) {
> 				if (other.data != null)
> 					return false;
> 			} else if (!data.equals(other.data))
> 				return false;
> 			if (name == null) {
> 				if (other.name != null)
> 					return false;
> 			} else if (!name.equals(other.name))
> 				return false;
> 			if (type == null) {
> 				if (other.type != null)
> 					return false;
> 			} else if (!type.equals(other.type))
> 				return false;
> 			if (zone == null) {
> 				if (other.zone != null)
> 					return false;
> 			} else if (!zone.equals(other.zone))
> 				return false;
> 			return true;
> 		}
> 	}
> 	/**
> 	 * @author markusw
> 	 * @version $Revision$
> 	 */
> 	public enum Type {
> 		A, AAAA, ALIAS, CNAME, HINFO, MX, NAPTR, NS, PTR, RP, SRV, TXT
> 	}
> 	@Id
> 	@ManyToOne(fetch = FetchType.LAZY, cascade = { CascadeType.ALL })
> 	@JoinColumn(name = "domain", referencedColumnName = "name")
> 	private Domain zone;
> 	@Id
> 	@Column(length = 64)
> 	private String name;
> 	@Id
> 	@Enumerated(EnumType.STRING)
> 	private Type type;
> 	@Id
> 	@Column(length = 128)
> 	private String data;
> ...
> }

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