Got a problem thats doing my head in if anyone can explain whats going on.
Spent too much time trying to figure this and getting nowhere. Any HELP
greatfully received.
I have a simple ejb3 stateless EAR application. it consists of an ejb jar for
my entity classes, and an enterprise object access wrapper (EJB equiv of
generic DAO pattern for old hibernate - tried this based on EJB3 in action
book).
the app is simple - it has a node entity and link entity, and you link nodes to
links backwards and forwards (at java level its a bit like a doubly linked list.
I have set transitive persistence for persist and merge actions
essentially i have an external test app that creates some nodes and links them.
I use the nodeEAO to persist the 3 nodes and two links in the DB (mysql).
This works okay, and the entities are persisted.
| client app code outside the conatiner ...
| ctx = getInitialContext();
|
| aNode = new Node();
| bNode = new Node ();
| cNode = new Node ();
| uNode = new Node (); // empty
| zNode = new Node (); // empty
|
|
| aNode.setNodeName("William");
| bNode.setNodeName("10 South Close");
| cNode.setNodeName("G01 B32");
|
| try
| {
| UserTransaction ut =
(UserTransaction)ctx.lookup("UserTransaction");
| ut.begin();
| Link aLink = aNode.addLinkTo(bNode);
| aNode.addLinkTo(cNode);
| //update uNode to persisted value
| uNode = nodeEAO.save(aNode);
|
| ut.commit();
| } catch (Exception e)
| {e.printStackTrace();
| System.exit(0);}
|
| ...
|
| then later i call the following
|
| if (nodeEAO.removeLink(uNode, zNode))
| {
|
| System.out.println ("deleted link : \n");
| }
|
|
The code in the EJB in the container for this looks like
| EJB nodeEAO code ...
|
|
| @Stateless
| public class NodeEAOBean extends EAOBean<Node, Long> implements NodeEAO,
NodeEAOLocal, NodeEAORemote
| {
| @Resource
| private SessionContext sc;
|
| static final long serialVersionUID =1;
| ...
|
| @TransactionAttribute (TransactionAttributeType.REQUIRED)
| public boolean removeLink (Node fromNode, Node remoteNode)
| {
|
| List<Link> qres;
| Logger log = Logger.getLogger("NodeEAOBean");
| log.setLevel(org.apache.log4j.Level.DEBUG);
|
| if (fromNode == null || remoteNode == null)
| {
| log.error("was passed a null reference");
| return false;
| }
|
| fromNode = em.merge(fromNode);
| remoteNode = em.merge(remoteNode);
| Query q = em.createNamedQuery("findLinksBetweenNodes");
| q.setParameter("toNode", remoteNode);
| q.setParameter("fromNode", fromNode);
|
| log.debug("to node details " + remoteNode.getNodeName() + "\n");
|
| qres = (List<Link>)q.getResultList();
| if (qres != null && qres.size () == 1)
| {
| Link link = qres.get(0);
| remoteNode.deleteLinkFrom(link);
| fromNode.deleteLinkTo(link);
| em.remove(link);
| return true;
| }
| else
| {return false;}
|
| }
|
when i get to the removeLink call in the client this works and the database is
updated and one of my links is deleted.
Next I query for remaining links seen from the first node this calls
|
| ...
| List<Node> nodeList2 =
nodeEAO.getConnectedToNodes(uNode);
| if (nodeList2 != null)
| {
| for (Node n : nodeList )
| {
| System.out.println ("got connected node
: " + n.getNodeName() + "/n");
| }
| }
|
|
on the the ejb server this runs a query to get the result .
|
| @TransactionAttribute (TransactionAttributeType.REQUIRED)
| public List<Node> getConnectedToNodes (Node fromNode)
| {
| Logger log = Logger.getLogger("NodeEAOBean");
| log.setLevel(org.apache.log4j.Level.DEBUG);
|
| if (fromNode == null )
| {
| log.error("was passed a null reference");
| return null;
| }
|
| fromNode = em.merge(fromNode);
| Query q = em.createNamedQuery("getLinkedNodes");
| q.setParameter("fromNode", fromNode);
|
| return (List<Node>)q.getResultList();
|
| }
|
however when i run this i get the foillowing error
anonymous wrote :
|
|
| Exception in thread "main" javax.ejb.EJBException:
javax.persistence.OptimisticLockException at
org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:63)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
| at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:304)
| at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
| at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:769)
| at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:573)
| at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:373)
| at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:166)
| Caused by: javax.persistence.OptimisticLockException
| at
org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:642)
at
org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:599)
| at
org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:236)
| at
org.jboss.ejb3.entity.TransactionScopedEntityManager.merge(TransactionScopedEntityManager.java:188)
| at
org.softwood.neilsapp.eao.NodeEAOBean.getConnectedToNodes(NodeEAOBean.java:135)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
| at java.lang.reflect.Method.invoke(Unknown Source)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
| at
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
| at
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
| at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:304)
| at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
| at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:769)
| at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:573)
| at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:373)
| at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:166)
| at
org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:163)
| at org.jboss.remoting.Client.invoke(Client.java:1634)
| at org.jboss.remoting.Client.invoke(Client.java:548)
| at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
| at $Proxy0.getConnectedToNodes(Unknown Source)
| at org.EAOtest.main(EAOtest.java:121)
| at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
| at $Proxy0.getConnectedToNodes(Unknown Source)
| at org.EAOtest.main(EAOtest.java:121)
| Caused by: org.hibernate.StaleObjectStateException: Row was updated or
deleted by another transaction (or unsaved-value mapping was incorrect):
[org.softwood.neilsapp.model.node.Node#1] at
org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:261)
| at
org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:120)
| at
org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53)
| at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
| at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
| at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665)
| at
org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:227)
| at
org.jboss.ejb3.entity.TransactionScopedEntityManager.merge(TransactionScopedEntityManager.java:188)
| at
org.softwood.neilsapp.eao.NodeEAOBean.getConnectedToNodes(NodeEAOBean.java:135)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
| at java.lang.reflect.Method.invoke(Unknown Source)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
| at
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
| at
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
| at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:304)
| at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
| at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:769)
| at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:573)
| at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:373)
| at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:166)
|
|
WHat is wrong here - each method in the bean is defined as tranasctional - so
when the delete action is run doesnt the persistence context flushed?.
If so when i run the next query method - which passes the original node as
base of the search and merge that inside a new transaction do I get this
optimistic error.
if i try to debug this from eclipse i get another error from the server which
says a transaction isnt active ! bizarre as its got the required annotation
for the method
HELP please anyone who can understand whats wrong.
anonymous wrote :
|
| Exception in thread "main" java.lang.IllegalStateException:
[com.arjuna.ats.internal.jta.transaction.arjunacore.inactive]
[com.arjuna.ats.internal.jta.transaction.arjunacore.inactive] The transaction
is not active! at
com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1379)
| at
com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
| at
com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
| at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:175)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
| at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:304)
| at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
| at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
| at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:769)
| at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:573)
| at
org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:373)
| at
org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:166)
| at
org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:163)
| at org.jboss.remoting.Client.invoke(Client.java:1634)
| at org.jboss.remoting.Client.invoke(Client.java:548)
| at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
| at $Proxy0.removeLink(Unknown Source)
| at org.EAOtest.main(EAOtest.java:115)
| at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:67)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:53)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
| at
org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:107)
| at $Proxy0.removeLink(Unknown Source)
| at org.EAOtest.main(EAOtest.java:115)
|
|
|
the code for the query is defined with the entity.
| @Entity
| @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
| @DiscriminatorColumn
| (name="nodeType",
| discriminatorType=DiscriminatorType.STRING)
| @DiscriminatorValue ("generic node")
|
| @NamedQueries ({
| @NamedQuery(
| name = "findLinksBetweenNodes",
| query = "SELECT l FROM Link l " +
| "WHERE (l.fromNode = :fromNode " +
| "AND l.toNode = :toNode)"
| ),
| @NamedQuery(
| name = "getLinkedNodes",
| query = "SELECT l.toNode FROM Link l " +
| "WHERE (l.fromNode = :fromNode) "
| )
| })
| public class Node implements Serializable
| {
| static final long serialVersionUID = 1;
|
| @Id @GeneratedValue
| @Column(name="nodeID")
| private Long nodeID;
|
| @Version
| private long version;
|
| //enable transitive persistence from owning node to links
| @OneToMany (mappedBy="fromNode", cascade={CascadeType.PERSIST,
CascadeType.MERGE })
|
@org.hibernate.annotations.Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
| protected Set<Link> fromLinks;
|
| @OneToMany (mappedBy="toNode", cascade={CascadeType.PERSIST,
CascadeType.MERGE })
|
@org.hibernate.annotations.Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)
| protected Set<Link> toLinks;
|
| // not required and errors on load @Temporal (TemporalType.TIMESTAMP)
| private Timestamp lastUpdated;
|
| @Column(length=255, nullable=false) @NotNull
| private String nodeName;
|
| @Column(length=255)
| private String aliasName;
|
| //calculated: how important is this node
| private int weight;
|
| //as set by a user: how important is this node
| private int importance;
|
| public Long getID () {return nodeID;}
|
| public Node ()
| {
| //initialise the links
| toLinks = new HashSet<Link>();
| fromLinks = new HashSet<Link>();
|
| DateFormat fmt = DateFormat.getDateTimeInstance();
| nodeName = "generic node: " + fmt.format(new Date());
| }
|
| public Node (String name)
| {
| if (name != null)
| this.nodeName = name;
| else nodeName = "null";
| }
|
| public long getVersion() {return version;}
| public String getNodeName () {return nodeName;}
| public void setNodeName (String name) {this.nodeName = name;}
|
| public String getAliasName () {return aliasName;}
| public void setAliasName (String name) {this.aliasName = name;}
|
| public int getImportance () {return importance;}
| public void setImportance (int imp) {this.importance = imp;}
| public void incrementImportance () {this.importance++;}
| public void decrementImportance () {this.importance--;}
|
| public void calculateWeight ()
| {/*TODO*/};
|
| protected void setLastUpdated()
| {
| Date now = new Date();
| lastUpdated = new Timestamp (now.getTime());
| }
|
| @TransactionAttribute (TransactionAttributeType.REQUIRED)
| public Link addLinkTo (Node remoteNode)
| {
| Link aLink = new Link ();
| aLink.setName("link from " + this.getNodeName() + " to " +
remoteNode.getNodeName());
| //set the link relationships
| aLink.setToNode(remoteNode);
| aLink.setFromNode(this);
| //set the node relationships to the joining link
| this.setLinkTo(aLink);
| remoteNode.setLinkFrom(aLink);
|
| //return the new link
| return aLink;
| }
|
| public Set<Link> getLinkTo ()
| {
| return toLinks;
| }
|
| public void setLinkTo (Link link)
| {
| toLinks.add(link);
| }
|
| public void deleteLinkTo (Link link)
| {
| toLinks.remove(link);
| }
|
| public Set<Link> getLinkFrom ()
| {
| return fromLinks;
| }
|
| public void setLinkFrom (Link link)
| {
| fromLinks.add(link);
| }
|
| public void deleteLinkFrom (Link link)
| {
| fromLinks.remove(link);
| }
| }
|
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