I need to manage M:N table where M and N are variables. I thought that rich:columns could help me, but I wasn't able to set up example from demos because of

java.lang.IllegalStateException: Component ID j_id_jsp_433896525_1:columns:j_id_jsp_433896525_5 has already been found in the view.

I'd like to create dataTable with following parameters:

| rowTitle | column1 | column2 | ... |
| rowTitle2 | column1 | column2 | ... |
| rowTitle3 | column1 | column2 | ... |

My solution was ArrayList of Rows where was title and next ArrayList which I wanted to print out using rich:columns. I don't need any header or footer, just data...

jsp page:

<rich:dataTable id="dataTable" value="#{mnAnswersBean.mnAnswer}" var="row">
 <rich:column id="title">
 <h:outputText value="#{row.title}" />
 </rich:column>

 <rich:columns id="columns" value="#{row.choices}" var="col">
 <h:outputText value="#{col}" />
 </rich:columns>

</rich:dataTable>

Managedbean:

...
private List<MNAnswer> answers;
...

MNAnswer class:

...
private String title;
private List<String> choices;
...

Could anyone help me?