Displaying more than One table in a dataTable

Question

have 3 types of Document. Each type of Document is storing into different table also with different column.
For displaying then individually i have created separate Beans for them n working fine.
Now i want to show all document in one dataTable.
I have done following way......
List<Object> dataList;
List<Object> dataList2;
public List getList()
          retriveAllFiles(); // retrieves data from hibernate Bean File "File"
          System.out.println(" 'dataList' size is " + dataList.size());
          retriveAllBills(); // retrieves data from hibernate Bean File "Bill"
          System.out.println(" 'dataList2' size is " + dataList2.size());
          dataList.addAll(dataList2);
          System.out.println(" After size is " + dataList.size());
          return this.dataList;
<h:dataTable border="1" value="#{GenericList.list}" var="next">
                    <h:column id="column2">
                         <f:facet name="header">
                              <h:outputText value="File Name"></h:outputText>
                         </f:facet>
                         *<h:outputText value="#{next}"></h:outputText>*
                    </h:column>
Out put is :
File Name      
hibernate.beans.File@f77511      
hibernate.beans.File@26dfcc      
hibernate.beans.File@2eef15      
hibernate.beans.File@186ed7a      
hibernate.beans.File@150f0a7      
hibernate.beans.File@e771f3      
hibernate.beans.Bill@1d4340c      
hibernate.beans.Bill@a51027      
Any one can help me ??

Answer 1

Do you actually want an explanation of the 'rendered' attribute or of how EL works?
The working of the 'rendered' attribute is fairly simple. If its value (can be EL, or just boolean true or false) evaluates to 'true', then the component will be rendered in the view, otherwise it will not be rendered in the view. Every JSF HTML component supports this attribute and there are also a few facets which supports it too, like f:verbatim. Just checkout the JSF TLD documentation: http://java.sun.com/javaee/javaserverfaces/1.2/docs/tlddocs
About the EL, well, you can access bean properties in EL by its getters. Fortunately the Object API provides a getClass() method, which is strictly a getter, and the Class API provides a getName() method, which is strictly also a getter. So you can use #{someObject.class.name} to get the full class name of SomeObject in EL. It will simply be evaluated as someObject.getClass().getName(). You can use operators and evaluate boolean expressions in EL, here are some examples:
<h:someComponent rendered="#{myBean.booleanValue}" />
<h:someComponent rendered="#{myBean.intValue > 10}" />
<h:someComponent rendered="#{myBean.objectValue == null}" />
<h:someComponent rendered="#{myBean.stringValue != 'someValue'}" />
<h:someComponent rendered="#{!empty myBean.collectionValue}" />
<h:someComponent rendered="#{!myBean.booleanValue && myBean.intValue != 0}" />
<h:someComponent rendered="#{myBean.stringValue == 'oneValue' || myBean.stringValue == 'anotherValue'}" />You can read more about EL in the Java EE tutorial: http://java.sun.com/javaee/5/docs/tutorial/doc/bnahq.html