Hi there
I'm experimenting a bit with seam, but I'm currently stuck on this issue...
I building a simple questionaire page; one has a list of questions with radio
answers.
In order to display answers like:
| <h:column>
| <f:facet name="Answer">
| <h:outputText value="Answers"/>
| </f:facet>
| <h:selectOneRadio value="#{question.selectedAnswer}"
converter="#{ansbean.converter}">
| <f:selectItems value="#{question.answerMap}" />
| </h:selectOneRadio>
| </h:column>
|
I had to write a converter bean, along the lines of the one in the dvd store
example. This is basically
|
| @Stateful
| @Name("ansbean")
| @Scope(ScopeType.APPLICATION)
| @Interceptors(SeamInterceptor.class)
| public class AnswersBean implements Answers {
|
| Logger log = Logger.getLogger(Register.class);
| List<Answer> answers;
| Map<String, Answer> answersMap;
|
| @PersistenceContext(type=EXTENDED)
| EntityManager em;
|
| @Create
| public void loadData(){
| //load some stuff from db
| }
| public Converter getConverter() {
| return new AnswerConverter(em);
| }
|
| static public class AnswerConverter implements Converter, Serializable {
|
| Logger log = Logger.getLogger(AnswerConverter.class);
| private EntityManager em;
|
| public AnswerConverter(EntityManager em) {
| this.em = em;
| }
|
| public Object getAsObject(FacesContext facesContext,
| UIComponent uiComponent,
| String value) throws ConverterException {
|
| if ((value == null) || value.length() == 0) {
| return null;
| }
|
| log.info("INTO CONVERTER Asobject()");
|
| int id = Integer.valueOf(value).intValue();
|
| Answer ret = null;
| ret = (Answer) em.createQuery("from Answer where
id=?").setParameter(0,id).getSingleResult();
| return ret;
| }
|
| public String getAsString(FacesContext facesContext,
| UIComponent uiComponent,
| Object object) throws ConverterException {
| if (object == null) return null;
|
| return String.valueOf(((Answer) object).getId());
|
| }
| }
| }
|
|
In my Question entity bean (one to many relationship with Answer) I have
created an helper method like
|
| @Transient
| public Map<String, Answer> getAnswerMap(){
| Map<String, Answer> results = new TreeMap<String, Answer>();
|
| for (Answer answer : answers) {
| result.put(answer.getText(), answer);
| }
|
| answerMap = results;
| return answerMap;
| }
|
|
The page loads the questionaire fine, but when I submit it I get the following
trace:
|
| 11:32:32,734 ERROR [AnswersBean$AnswerConverter]
java.lang.NullPointerException
| 11:32:32,734 ERROR [STDERR] java.lang.NullPointerException
| 11:32:32,735 ERROR [STDERR] at
org.jboss.ejb3.entity.ExtendedEntityManager.getPersistenceContext(ExtendedEntityManager.java:59)
| 11:32:32,736 ERROR [STDERR] at
org.jboss.ejb3.entity.ExtendedEntityManager.createQuery(ExtendedEntityManager.java:129)
| 11:32:32,736 ERROR [STDERR] at
org.jboss.seam.example.registration.AnswersBean$AnswerConverter.getAsObject(AnswersBean.java:104)
| 11:32:32,736 ERROR [STDERR] at
org.apache.myfaces.renderkit.RendererUtils.getConvertedUIOutputValue(RendererUtils.java:658)
| 11:32:32,736 ERROR [STDERR] at
org.apache.myfaces.renderkit.html.HtmlRadioRendererBase.getConvertedValue(HtmlRadioRendererBase.java:288)
| 11:32:32,737 ERROR [STDERR] at
javax.faces.component.UIInput.getConvertedValue(UIInput.java:289)
| 11:32:32,737 ERROR [STDERR] at
javax.faces.component.UIInput.validate(UIInput.java:265)
| 11:32:32,737 ERROR [STDERR] at
javax.faces.component.UIInput.processValidators(UIInput.java:144)
| 11:32:32,738 ERROR [STDERR] at
javax.faces.component.UIData.process(UIData.java:514)
| 11:32:32,738 ERROR [STDERR] at
javax.faces.component.UIData.processColumnChildren(UIData.java:498)
| 11:32:32,738 ERROR [STDERR] at
javax.faces.component.UIData.processValidators(UIData.java:403)
| 11:32:32,738 ERROR [STDERR] at
javax.faces.component.UIForm.processValidators(UIForm.java:68)
| 11:32:32,739 ERROR [STDERR] at
javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:417)
| 11:32:32,739 ERROR [STDERR] at
javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:142)
| 11:32:32,739 ERROR [STDERR] at
org.apache.myfaces.lifecycle.LifecycleImpl.processValidations(LifecycleImpl.java:240)
| 11:32:32,740 ERROR [STDERR] at
org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76)
| 11:32:32,740 ERROR [STDERR] at
javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
| 11:32:32,740 ERROR [STDERR] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
| 11:32:32,740 ERROR [STDERR] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| 11:32:32,741 ERROR [STDERR] at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
| 11:32:32,741 ERROR [STDERR] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| 11:32:32,741 ERROR [STDERR] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| 11:32:32,742 ERROR [STDERR] at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
| 11:32:32,742 ERROR [STDERR] at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
| 11:32:32,742 ERROR [STDERR] at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
| 11:32:32,743 ERROR [STDERR] at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
| 11:32:32,743 ERROR [STDERR] at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
| 11:32:32,743 ERROR [STDERR] at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
| 11:32:32,744 ERROR [STDERR] at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
| 11:32:32,744 ERROR [STDERR] at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
| 11:32:32,744 ERROR [STDERR] at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
| 11:32:32,745 ERROR [STDERR] at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
| 11:32:32,745 ERROR [STDERR] at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
| 11:32:32,746 ERROR [STDERR] at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
| 11:32:32,746 ERROR [STDERR] at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
| 11:32:32,746 ERROR [STDERR] at java.lang.Thread.run(Unknown Source)
|
|
|
While the page that I'm trying to render contains:
|
| <h:dataTable var="question" value="#{questions}"
rendered="#{questions.rowCount>0}">
| <h:column>
| <f:facet name="Question">
| <h:outputText value="Question text"/>
| </f:facet>
| <h:outputText value="#{question.text}" />
| </h:column>
| <h:column>
| <f:facet name="Answer">
| <h:outputText value="Answers"/>
| </f:facet>
| <h:outputText value="#{question.selectedAnswer}"/>
| </h:column>
|
| </h:dataTable>
|
|
Initially I had no EXTENDED PersistenceContextType but I had a similar
NullPointerException in ManagedEntityManagerFactory.getNonTxEntityManager()
Does this have something to do with that on the second page there's no
reference to ansbean?
Thanks in advance for any hint. I have to say that the seam model is somehow
unclear to me yet...
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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3939159#3939159
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http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3939159
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