4:03 p.m.
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#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...