Problems whith rich:columns

Question

I have the next code to iterate over a ArrayList, like a dataTable,
     <h:panelGrid>
          <r:dataTable value="#{sessionBean.products}" var="product">
               <r:column>
                    <h:outputText value ="#{product.name}"/>
               </r:column>
               <r:columns value="#{sessionBean.canalesVenta}" var="canal">
               <f:facet name="header">
                    <h:outputText value="#{canal.name}"/>
               </f:facet>
               </r:columns>
          </r:dataTable>
     </h:panelGrid>
if I run this code give me a stack trace with the error: FOREACH_BAD_ITEMS, and I dont know to arrange this problem.
thank you for some help i really need it

Answer 1

I keep geting this error
java.sql.SQLException: ORA-01729: database link name expected
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:955)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1169)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3368)
when ever i try to update The Blob colum with a Blob object retrieved by resultset.getBlob from another Blob column of a different table.
Blob b = rset.getBlob(1);
String x = (String)jComboBox2.getSelectedItem();
ps=c.prepareStatement("UPDATE PROPERTIES SET "x" = "b" WHERE NAME = ?");
ps.setString(1, (String)jComboBox1.getSelectedItem());
System.out.println("success");
ps.executeUpdate();