[jboss-user] [JBoss Seam] - Seam: @In attribute requires non-null value

[errorken]

I have a JSF page containing a datatable showing a list of customers retrieved from the database. The datatable is linked with a backing bean which retrieves the customers from database using a hibernate session.

The last column of each row in the table has a button. When pressed it will call a method on the backing bean to retrieve the details of that customer.

I made this entirely based on the "hibernate" example supplied with seam.

I got it working so that the customers are retrieved by the backing bean from the injected hibernate session. The problem is that when I press the button, an ajax call is made to the backing bean, but here it goes wrong. I get an exception:


  | Caused by: org.jboss.seam.RequiredException: @In attribute requires non-null value: userTableDataModel.bookingDatabase
  | 	at org.jboss.seam.Component.getValueToInject(Component.java:2168)
  | 	at org.jboss.seam.Component.injectAttributes(Component.java:1598)
  | 	at org.jboss.seam.Component.inject(Component.java:1416)
  | 	at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:45)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
  | 	at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
  | 	at org.jboss.seam.core.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:32)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
  | 	at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
  | 	at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
  | 	at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
  | 	at be.application.UserTableBean_$$_javassist_1.setDataTable(UserTableBean_$$_javassist_1.java)
  | 	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 javax.el.BeanELResolver.setValue(BeanELResolver.java:108)
  | 	... 52 more
  | 

Fact is that it wasnt' null when the datatable was loaded the first time. Apparantly it gets "null" when a second method on the backing bean is invoked.

I tried about everything, but I cannot figure out why I'm getting this.
Any help would be greatly appreciated.

I'm using:

Seam 2.0.1
JBoss 4.2
Trinidad, Richfaces, Tomahawk

My code:


  | Name("userTableDataModel")
  | @Scope(ScopeType.SESSION)
  | public class UserTableBean implements Serializable {
  | 
  | 	@In
  | 	Session bookingDatabase;
  | 	public List getListAll() {
  | 		customerList = bookingDatabase.createQuery("select c from CustomerTO as c").list();
  | 		return customerList;
  | 	}
  | 
  | public void showDetails()
  | {
  | System.out.println("Showing detail");
  | }
  | }
  | 

As you see the show detail is not doing anything besides printing something in the log -- untill now it doesn't get invoked since I'm getting the error prior the method could be invoked.

My faces config:


  | <faces-config>
  | 	<managed-bean>
  | 		<managed-bean-name>userTableDataModel</managed-bean-name>
  | 		<managed-bean-class>
  | 			be.application.UserTableBean
  | 		</managed-bean-class>
  | 		<managed-bean-scope>session</managed-bean-scope>
  | 		</managed-bean>
  | </faces-config>
  | 

The relevant parts of web.xml


  | 	<filter>
  | 		<filter-name>Seam Filter</filter-name>
  | 		<filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
  | 	</filter>
  | 
  | 	<filter>
  | 		<filter-name>Seam Exception Filter</filter-name>
  | 		<filter-class>
  | 			org.jboss.seam.servlet.SeamExceptionFilter
  | 		</filter-class>
  | 	</filter>
  | 
  | 	<filter-mapping>
  | 		<filter-name>Seam Filter</filter-name>
  | 		<url-pattern>/*</url-pattern>
  | 	</filter-mapping>
  | 
  | 	<filter-mapping>
  | 		<filter-name>Seam Exception Filter</filter-name>
  | 		<url-pattern>*.jsf</url-pattern>
  | 	</filter-mapping>
  | 
  | 	<listener>
  | 		<listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
  | 	</listener>
  | 
  | 	<servlet>
  | 		<servlet-name>Faces Servlet</servlet-name>
  | 		<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  | 		<load-on-startup>1</load-on-startup>
  | 	</servlet>
  | 
  | 	<servlet-mapping>
  | 		<servlet-name>Faces Servlet</servlet-name>
  | 		<url-pattern>*.jsf</url-pattern>
  | 	</servlet-mapping>
  | 
  | 	<servlet-mapping>
  | 		<servlet-name>Faces Servlet</servlet-name>
  | 		<url-pattern>/faces/*</url-pattern>
  | 	</servlet-mapping>
  | 

Components.xml

  | 	<core:manager conversation-timeout="120000"
  | 		concurrent-request-timeout="500" conversation-id-parameter="cid" />
  | 
  | 	<persistence:hibernate-session-factory
  | 		name="hibernateSessionFactory" />
  | 
  | 	<persistence:managed-hibernate-session name="bookingDatabase"
  | 		session-factory="#{hibernateSessionFactory}" auto-create="true" />
  | 
  | 	<transaction:hibernate-transaction session="#{bookingDatabase}" />
  | 

Hibernate config:


  | <hibernate-configuration>
  |     <session-factory name="java:/bookingDatabase">
  |         <property name="show_sql">true</property>
  |         <property name="connection.datasource">java:jdbc/db</property>
  |         <property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>
  |         <property name="transaction.flush_before_completion">true</property>
  |         <property name="transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property>
  | 		<property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
  | 		<mapping resource="be/backend/Customer.hbm.xml"/>
  | 		<mapping resource="be/backend/Product.hbm.xml"/>
  |     </session-factory>
  | </hibernate-configuration>
  | 

The command button to get the details:


  | 					<a4j:commandButton id="show_detail"
  | 						action="#{userTableDataModel.showDetail}"
  | 						value="#{msg['userinformation.showdetail']}"
  | 


View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4129847#4129847

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4129847