"Cannot get value for expression" error

[nusa]

Hi,

I have the following jsp page :

<h:dataTable value="#{projectUpdate.findAll}" var="row" rows="10"
 binding="#{dataAction.table}" >

 <h:column>
 <f:facet name="header">
 <h:outputText value="ProjectID" />
 </f:facet>
 <h:outputText value="#{row.projectId}" />
 </h:column>

 <h:column>
 <f:facet name="header">
 <h:outputText value="ProjectName" />
 </f:facet>
 <h:inputText value="#{row.projectName}" />
 </h:column>

 <h:column>
 <f:facet name="header">
 <h:outputText value="Descriptions" />
 </f:facet>
 <h:inputText value="#{row.descriptions}" />
 </h:column>
 <h:column>
 <f:facet name="header">
 <h:outputText value="SelectItem" />
 </f:facet>
 <h:commandButton value="Update" action="#{projectUpdate.markForEdition}" />
 </h:column>

</h:dataTable>

and these 2 beans :

@Name("dataAction")
@Scope(EVENT)
public class DataAction {

 private static Logger log = Logger.getLogger(DataAction.class);

 private UIData table;

 public UIData getTable() {
 return table;
 }

 public void setTable(UIData table) {
 this.table = table;
 }

}

@Intercept(InterceptionType.ALWAYS)
@Name("projectUpdate")
public class ProjectUpdate implements Serializable {

 private static Logger log = Logger.getLogger(ProjectUpdate.class);

 @In
 @Out
 private Project project;

 private List<Project> listProject;

 @In(create=true)
 private Session hibernateSession;

 public ProjectUpdate() {
 log.info("=== Constructor ...");
 }

 public List<Project> getFindAll() {
 log.info("=== getFindAll ... ");
 if (listProject == null)
 buildListProject();
 return listProject;
 }

 public void setFindAll(List<Project> prj) {
 this.listProject = prj;
 }

 @SuppressWarnings("unchecked")
 public void buildListProject() {
 log.info("=== buildListProject ... ");
 List<Project> list = null;
 try {
 list = hibernateSession.createCriteria(Project.class)
 .addOrder(Order.asc("projectName"))
 .list();
 log.info("=== buildListProject has : " + list.size());
 } catch (HibernateException ex) {
 log.info("HibernateException raised : " + ex.toString());
 }
 setFindAll(list);
 }

 @IfInvalid(outcome=REDISPLAY)
 public String markForEdition() {
 log.info("=== markForEdition ...");

 log.info("=== get dataAction ...");
 DataAction data = (DataAction)Contexts.getEventContext().get("dataAction");

 UIData table = data.getTable();

 if ( table.isRowAvailable() ) {
 project = (Project) table.getRowData();
 log.info("=== Attempting to update a row : " + project.toString());

 hibernateSession.saveOrUpdate(project);
 return "success";
 } else {
 log.info("=== Couldn't find row !!!");
 }

 return null;
 }

}

When that JSP page get rendered, the list of projects is displayed properly :

14:53:03,192 INFO [example.action.ProjectUpdate] === Constructor ...
14:53:03,192 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:53:03,192 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolved name to seam component
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: project
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: project.component
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in conversation context: hibernateSession
14:53:03,202 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: hibernateSession.component
14:53:03,202 INFO [example.action.ProjectUpdate] === getFindAll ...
14:53:03,202 INFO [example.action.ProjectUpdate] === buildListProject ...
14:53:03,232 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
14:53:03,232 DEBUG [org.hibernate.jdbc.ConnectionManager] opening JDBC connection
14:53:03,232 DEBUG [org.hibernate.jdbc.JDBCContext] successfully registered Synchronization
14:53:03,232 DEBUG [org.hibernate.SQL]
 select
 this_.projectId as projectId0_0_,
 this_.version as version0_0_,
 this_.descriptions as descript3_0_0_,
 this_.projectName as projectN4_0_0_
 from
 Project this_
 order by
 this_.projectName asc
14:53:03,232 INFO [STDOUT] Hibernate:
 select
 this_.projectId as projectId0_0_,
 this_.version as version0_0_,
 this_.descriptions as descript3_0_0_,
 this_.projectName as projectN4_0_0_
 from
 Project this_
 order by
 this_.projectName asc
14:53:03,232 DEBUG [org.hibernate.jdbc.AbstractBatcher] preparing statement
14:53:03,232 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open ResultSet (open ResultSets: 0, globally: 0)
14:53:03,242 DEBUG [org.hibernate.loader.Loader] processing result set

But when I click on the 'Update' button, I got the following error :

14:56:45,112 DEBUG [org.jboss.seam.contexts.Lifecycle] >>> Begin web request
14:56:45,112 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,112 DEBUG [org.jboss.seam.Component] instantiating Seam component: org.jboss.seam.core.manager
14:56:45,112 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolving name: dataAction
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
14:56:45,153 DEBUG [org.jboss.seam.Component] instantiating Seam component: dataAction
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolved name to seam component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolving name: dataAction
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: dataAction
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolved name to seam component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.core.Manager] No stored conversation
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.init
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.init.component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamPhaseListener] After restore view, conversation context: ConversationContext(3)
14:56:45,153 DEBUG [org.jboss.seam.contexts.BusinessProcessContext] Created BusinessProcessContext
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolving name: projectUpdate
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:56:45,153 DEBUG [org.jboss.seam.Component] instantiating Seam component: projectUpdate
14:56:45,153 INFO [example.action.ProjectUpdate] === Constructor ...
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:56:45,153 DEBUG [org.jboss.seam.jsf.SeamVariableResolver] resolved name to seam component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,153 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,153 ERROR [org.jboss.seam.servlet.SeamExceptionFilter] uncaught exception handled by Seam: Cannot get value for expression '#{projectUpdate.findAll}'
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] After render response, destroying contexts
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] flushing busines process context
14:56:45,163 DEBUG [org.jboss.seam.contexts.BusinessProcessContext] no in-memory state to flush to jBPM context
14:56:45,163 DEBUG [org.jboss.seam.contexts.BusinessProcessContext] no jBPM context to which to flush
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] destroying event context
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] destroying: org.jboss.seam.core.manager
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] destroying: dataAction
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: projectUpdate.component
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] destroying: projectUpdate
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] destroying conversation context
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] flushing server-side conversation context
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
14:56:45,163 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
14:56:45,163 DEBUG [org.jboss.seam.contexts.Lifecycle] <<< End web request
14:56:45,163 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/SeamTest].[faces]] Servlet.service() for servlet faces threw exception
javax.faces.el.EvaluationException: Cannot get value for expression '#{projectUpdate.findAll}'
 at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:399)
 at javax.faces.component.UIData.getValue(UIData.java:779)
 at javax.faces.component.UIData.createDataModel(UIData.java:545)
 at javax.faces.component.UIData.getDataModel(UIData.java:534)
...

Can someone help me where that error coming from ?

Thanks.

[nusa]

Hmmm,

If I amend the ProjectUpdate :

@In(create=true)

I don't have that error, but the update does not commited in the database, even the log says commited :

11:27:32,341 INFO [example.action.ProjectUpdate] === markForEdition ...
11:27:32,341 INFO [example.action.ProjectUpdate] === get dataAction ...
11:27:32,341 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: dataAction.component
11:27:32,341 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
11:27:32,341 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
11:27:32,341 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
11:27:32,341 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
11:27:32,341 INFO [example.action.ProjectUpdate] === Attempting to update a row : Project ( p4 0 Project4 Project4 by baa )
11:27:32,351 DEBUG [org.hibernate.event.def.AbstractSaveEventListener] persistent instance of: example.model.Project
11:27:32,351 DEBUG [org.hibernate.event.def.DefaultMergeEventListener] ignoring persistent instance
11:27:32,351 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: project.component
11:27:32,351 DEBUG [org.jboss.seam.contexts.Contexts] found in event context: org.jboss.seam.core.manager
11:27:32,351 DEBUG [org.jboss.seam.contexts.Contexts] found in application context: org.jboss.seam.core.manager.component
11:27:32,351 DEBUG [org.jboss.seam.jsf.SeamExtendedManagedPersistencePhaseListener] committing transaction

Aaarrrrgghhhh, this drives me crazy ...
Could someone give me a suggestion, please ?

Thanks.

[nusa]

Any taker please ?
How do you guys manage to update a row ?

I really need your help / suggestions.

Thanks

[nusa]

Any taker please ?
How do you guys manage to update a row ?

I'm stuck ... I really need your help / suggestions.

Thanks

[cajboss]

Please let me know if you have managed to figure out the solution?

thanks

[nusa]

I try to, but still without success.

I have my hibernate config file defined as :

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC
 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

 <session-factory name="hibernateSession">

 <!-- JNDI configuration for HSQL -->
 <property name="connection.datasource">java:DefaultDS</property>
 <property name="dialect">org.hibernate.dialect.HSQLDialect</property>

 <!-- Common configuration -->
 <property name="format_sql">true</property>
 <property name="show_sql">true</property>

 <!-- Plugin ConnectionProvider -->
 <property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>

 <property name="transaction.flush_before_completion">true</property>
 <property name="connection.release_mode">after_statement</property>

 <property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
 <property name="transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property>

 <mapping class="example.model.Project"/>

 </session-factory>

</hibernate-configuration>

I tried various combination of @In and @Out for the variable 'project', but it came with various answer.
If I use just @In, I got an error : "In attribute requires value for component: project".
If I use just @Out, I got : "Out attribute requires value for component: project"
If I use either @In(create=true) or @Out(required=false), it did not commited in the database.

How about you ? Any idea ?

Thanks