6:44 a.m.
My environment: JBoss As 4.2.0 GA, Seam 1.3.0 CVS June 14th, 2007
Here the backing bean:
| @Stateful
| @Scope(CONVERSATION)
| @Name("foodNutrients")
| public class FoodNutrientsAction implements Serializable, FoodNutrients {
|
| private static final long serialVersionUID = 366209327813983835L;
|
| @PersistenceContext(type=PersistenceContextType.EXTENDED)
| private EntityManager em;
|
| @DataModel
| private List<FoodWeight> weightUnits;
|
| public void cancel() {
| // TODO Auto-generated method stub
| }
|
| @Remove @Destroy
| public void destroy() {
| // TODO Auto-generated method stub
| }
|
| @Factory("weightUnits")
| public void findWeightUnits() {
| String query = "select w from FoodWeight w where w.food.ndbNo =
:foodId";
| this.weightUnits = em.createQuery(query).setParameter("foodId",
| "01001").getResultList();
| }
| }
|
Here the relevant part in the food-nutrients.xhtml:
| <ui:define name="body">
| <h:messages globalOnly="true" styleClass="message" />
| <rich:panel>
| <f:facet name="header">weight units loading
test</f:facet>
| <h:dataTable value="#{weightUnits}" var="unit">
| <h:column>
| <f:facet name="header">
| <h:outputText value="Unit" />
| </f:facet>
| <h:outputText value="#{unit.msreDesc}" />
| </h:column>
| </h:dataTable>
| </rich:panel>
| </ui:define>
|
Here is the relevant code in the entity class:
| @Entity
| @Name("foodWeight")
| @Scope(CONVERSATION)
| @Table(name = "weight")
| public class FoodWeight implements Serializable {
|
| @Embeddable
| public static class Id implements Serializable {
| private String foodId;
| private String seq;
|
| public Id(String foodId, String seq) {
| this.foodId = foodId;
| this.seq = seq;
| }
|
| public Id() {}
|
| @Column(name = "NDB_No", nullable = false, length = 5)
| public String getFoodId() {
| return foodId;
| }
|
| @Column(name = "Seq", nullable = false, length = 2)
| public String getSeq() {
| return seq;
| }
|
| public boolean equals(Object other) {
| if (this == other) return true;
| if (!(other instanceof Id)) return false;
|
| final Id pk = (Id) other;
|
| return pk.foodId.equals(this.foodId) && pk.seq.equals(this.seq);
| }
|
| public int hashCode() {
| int result;
| result = this.foodId.hashCode();
| result = 7 * result + this.seq.hashCode();
| return result;
| }
|
| public void setFoodId(String foodId) {
| this.foodId = foodId;
| }
|
| public void setSeq(String seq) {
| this.seq = seq;
| }
| }
|
| private Id id;
|
| private Food food;
|
| private String seq;
|
| private String msreDesc;
|
| //other fields....
|
| public FoodWeight() {}
|
| public FoodWeight(Food food, String seq, BigDecimal amount,
| String msreDesc, BigDecimal gmWgt) {
| // set fields
| this.food = food;
| this.seq = seq;
| this.amount = amount;
| this.msreDesc = msreDesc;
| this.gmWgt = gmWgt;
|
| // set identifier values
| this.id.foodId = food.getNdbNo();
| this.id.seq = seq;
|
| // Guarantee referential integrity
| food.getWeights().add(this);
| }
|
| /**
| * @return the food.
| */
| @ManyToOne(targetEntity = Food.class) //@OnDelete(action = OnDeleteAction.CASCADE)
| @JoinColumn(name = "NDB_No", insertable = false, updatable = false,
nullable = false)
| public Food getFood() {
| return food;
| }
|
| public void setFood(Food food) {
| this.food = food;
| }
|
| /**
| * @return the composite primary key of this class
| */
| @EmbeddedId
| public Id getId() {
| return id;
| }
|
| public void setId(Id id) {
| this.id = id;
| }
|
| /**
| * @return Description (for example, cup, diced, and 1-inch pieces)
| */
| @Column(name = "Msre_Desc", nullable = false, length = 80)
| public String getMsreDesc() {
| return msreDesc;
| }
|
| public void setMsreDesc(String msreDesc) {
| msreDesc = msreDesc;
| }
|
| /**
| * @return Sequence number
| */
| @Column(name = "Seq", insertable = false, updatable = false, nullable =
false, length = 2)
| public String getSeq() {
| return seq;
| }
|
| public void setSeq(String seq) {
| this.seq = seq;
| }
|
| // other getters and setters
|
| /* (non-Javadoc)
| * @see java.lang.Object#hashCode()
| */
| @Override
| public int hashCode() {
| final int prime = 31;
| int result = 1;
| result = prime * result
| + ((amount == null) ? 0 : amount.hashCode());
| result = prime * result + ((food == null) ? 0 : food.hashCode());
| result = prime * result + ((gmWgt == null) ? 0 : gmWgt.hashCode());
| result = prime * result
| + ((msreDesc == null) ? 0 : msreDesc.hashCode());
| result = prime * result + ((seq == null) ? 0 : seq.hashCode());
| return result;
| }
|
| /* (non-Javadoc)
| * @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 (!(obj instanceof FoodWeight)) return false;
| final FoodWeight other = (FoodWeight) obj;
| if (amount == null) {
| if (other.getAmount() != null) return false;
| } else if (!amount.equals(other.getAmount())) return false;
| if (food == null) {
| if (other.getFood() != null) return false;
| } else if (!food.equals(other.getFood())) return false;
| if (gmWgt == null) {
| if (other.getGmWgt() != null) return false;
| } else if (!gmWgt.equals(other.getGmWgt())) return false;
| if (msreDesc == null) {
| if (other.getMsreDesc() != null) return false;
| } else if (!msreDesc.equals(other.getMsreDesc())) return false;
| if (seq == null) {
| if (other.getSeq() != null) return false;
| } else if (!seq.equals(other.getSeq())) return false;
| return true;
| }
| }
|
|
When I was trying to load the food-nutrients.xhtml, I always got this exception:
Exception during request processing:
Caused by java.lang.IllegalStateException with message: "Could not commit
transaction"
...
Caused by javax.transaction.RollbackException with message:
"[com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted]
[com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] Can't commit
because the transaction is in aborted state"
...
Caused by javax.persistence.PersistenceException with message:
"org.hibernate.PropertyValueException: not-null property references a null or
transient value: org.ningning.eatsmart.entity.FoodWeight.msreDesc"
...
Caused by org.hibernate.PropertyValueException with message: "not-null property
references a null or transient value:
org.ningning.eatsmart.entity.FoodWeight.msreDesc"
org.hibernate.engine.Nullability.checkNullability(Nullability.java:72)
org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:263)
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:121)
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515)
com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114)
com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:249)
com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:88)
com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1256)
com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:140)
org.jboss.seam.transaction.UTTransaction.commit(UTTransaction.java:35)
org.jboss.seam.jsf.AbstractSeamPhaseListener.commitOrRollback(AbstractSeamPhaseListener.java:285)
org.jboss.seam.jsf.TransactionalSeamPhaseListener.handleTransactionsAfterPhase(TransactionalSeamPhaseListener.java:45)
org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:106)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:280)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:70)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:81)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:56)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:62)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:56)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:47)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:56)
org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:293)
org.jboss.seam.web.AbstractAjax4jsfFilter.doFilter(AbstractAjax4jsfFilter.java:35)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:56)
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:64)
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:56)
org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:127)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127)
org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
java.lang.Thread.run(Thread.java:619)
I wrote the code according to the example 1.11 described in user manual, mine is a
simplified version, just want to see if the FoodWeight can be loaded correctly given a
foodId. I read the user manual and Michael Yuan's Seam book in order to get a clue,
but failed to figure out what was wrong. I tried to let entityManager first load a food
entity and then use food.getFoodWeights(), that worked perfectly. But I desparately want
to know why the code above does not work and how to correctly use this way of data
fetching with Seam......Any enlightenment would be highly appreciated!
Regards,
Ellen
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