[jboss-user] [JBoss Seam] - Please help me, urgent, waiting online

[Seto]

Click the s:link and report Exception during INVOKE_APPLICATION(5): java.lang.IllegalArgumentException: attempt to create merge event with null entity. But the data of product.name is displayed normal. And it seems that the problem is the passing parameter of s:link.


  | 	<ui:repeat value="#{productCCList}" var="productCC">
  | 		<tr>
  | 			<td width="91" height="100%">
  | 			<table width="100%" height="100%" border="1" cellspacing="0"
  | 				cellpadding="0">
  | 				<tr>
  | 					<td>
  | 					<div align="center" style="font-size: 14px;">#{productCC.name}</div>
  | 					</td>
  | 				</tr>
  | 			</table>
  | 			</td>
  | 			<td>
  | 			<table width="100%" border="1" cellspacing="0" cellpadding="0">
  | 				<ui:repeat value="#{productCC.c}" var="productC">
  | 					<tr>
  | 						<td height="50">
  | 						<div align="center" style="font-size: 14px;">#{productC.name}</div>
  | 						</td>
  | 						<ui:repeat value="#{productC.product}" var="product">
  | 							<td>
  | 							<div align="center" style="font-size: 14px;"><s:link
  | 								id="viewProduct" value="#{product.name}"
  | 								action="#{hongyangManager.selectProduct(product)}" /></div>
  | 							</td>
  | 						</ui:repeat>
  | 					</tr>
  | 				</ui:repeat>
  | 			</table>
  | 			</td>
  | 		</tr>
  | 	</ui:repeat>
  | 


@Stateful
  | @Name("hongyangManager")
  | public class HongyangManagerAction implements HongyangManager {
  | 
  | 	@PersistenceContext(type = PersistenceContextType.EXTENDED)
  | 	EntityManager em;
  | 
  | 	@DataModel
  | 	List productCCList;
  | 
  | 	Product currentProduct;
  | 
  | 	XD currentXD;
  | 
  | 	YD currentYD;
  | 
  | 	@Factory
  | 	public void getProductCCList() {
  | 		productCCList = em.createQuery("from ProductCC productCC")
  | 				.getResultList();
  | 	}
  | 
  | 	public String selectProduct(Product selectedProduct) {
  | 		currentProduct = em.merge(selectedProduct);
  | 		return "product";
  | 	}
  | 
  | 	public String selectXD(XD selectedXD) {
  | 		currentXD = em.merge(selectedXD);
  | 		return "xd";
  | 	}
  | 
  | 	public String selectYD(YD selectedYD) {
  | 		currentYD = em.merge(selectedYD);
  | 		return "yd";
  | 	}
  | 
  | 	@Destroy
  | 	@Remove
  | 	public void destroy() {
  | 	}
  | }
  | 

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