I'll preface this by saying that I've been following a "recipe" that's "just
worked" for years, so I haven't had to make one work from scratch in ages.
However....
Your ValueEncoder will throw NPE's. Have a look at the
HibernateEntityValueEncoder in the tapestry-hibernate module - it uses a
null-safe implementation.
JB
On Wed, Sep 21, 2011 at 12:40 AM, csckid <testnowsh...@gmail.com> wrote:
> Now I have add an encoder
> <form t:type="form">
> <t:label for="members"/>:
> <t:select t:id="members" value="membersName" model="MemberSelectModel"
> encoder="wholeSaleMemberEncoder" />
> <t:submit value="save"/>
> </form>
>
>
> public class WholeSaleMemberEncoder implements
> ValueEncoder<WholeSaleMember>, ValueEncoderFactory<WholeSaleMember> {
>
> @Inject
> private WholeSaleMemberDao wholeSaleMemberDao;
> @Inject
> private DatabaseDao databaseDao;
>
> public String toClient(WholeSaleMember value) {
> // return the given object's ID
> return String.valueOf(value.getId());
> }
>
> public WholeSaleMember toValue(String id) {
>
> // find the color object of the given ID in the database
> return (WholeSaleMember) databaseDao.load(Long.parseLong(id),
> WholeSaleMember.class);
> }
>
> public ValueEncoder<WholeSaleMember> create(Class<WholeSaleMember>
> type) {
> // TODO Auto-generated method stub
> return this;
> }
> }
>
>
>
> public class CreateWMemberTruck {
>
>
> @Inject
> private WholeSaleMemberDao wholeSaleMemberDao;
> @Property
> private WholeSaleMemberEncoder wholeSaleMemberEncoder;
> @Property
> private SelectModel memberSelectModel;
> @Property
> @Inject
> private SelectModelFactory selectModelFactory;
>
> @Property
> private WholeSaleMember membersName;
>
>
> void setupRender() {
> // invoke my service to find all colors, e.g. in the database
> List<WholeSaleMember> members =
> wholeSaleMemberDao.getWholeSaleMembers();
>
> // create a SelectModel from my list of colors
> memberSelectModel = selectModelFactory.create(members,
> "fName");
> }
>
> void onSuccess() {
>
> System.out.println("\n\n\n"+membersName.getId()+"\n\n\n\n");
>
> }
> }
>
> Now t:select is not populated, that page gives an exception
> org.apache.tapestry5.internal.services.RenderQueueException
> Render queue error in
> BeforeRenderTemplate[wholesalemember/CreateWMemberTruck:members]:
> org.apache.tapestry5.ioc.internal.util.TapestryException
>
> #
>
> activeComponents
>
> * wholesalemember/CreateWMemberTruck (class
> com.kids.crm.pages.wholesalemember.CreateWMemberTruck)
> * wholesalemember/CreateWMemberTruck:layout (class
> com.kids.crm.components.Layout)
>
> classpath:com/kids/crm/pages/wholesalemember/CreateWMemberTruck.tml, line 4
> 1 <html t:type="layout" title="Create Whole sale Member
> Truck"
> 2 t:sidebarTitle="Browse Wood"
> 3 xmlns:t="
> http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";
> 4 xmlns:p="tapestry:parameter">
> 5 <form t:type="form">
>
> 8 <t:label for="members"/>:
> 9 <t:select t:id="members" value="membersName"
> model="MemberSelectModel" encoder="wholeSaleMemberEncoder" />
> * wholesalemember/CreateWMemberTruck:form (class
> org.apache.tapestry5.corelib.components.Form)
>
> classpath:com/kids/crm/pages/wholesalemember/CreateWMemberTruck.tml, line 5
> 1 <html t:type="layout" title="Create Whole sale Member Truck"
> 2 t:sidebarTitle="Browse Wood"
> 3 xmlns:t="
> http://tapestry.apache.org/schema/tapestry_5_1_0.xsd";
> 4 xmlns:p="tapestry:parameter">
> 5 <form t:type="form">
>
> 8 <t:label for="members"/>:
> 9 <t:select t:id="members" value="membersName"
> model="MemberSelectModel" encoder="wholeSaleMemberEncoder" />
> 10 <t:submit value="save"/>
> * wholesalemember/CreateWMemberTruck:members (class
> org.apache.tapestry5.corelib.components.Select)
>
> classpath:com/kids/crm/pages/wholesalemember/CreateWMemberTruck.tml, line 9
> 4 xmlns:p="tapestry:parameter">
> 5 <form t:type="form">
>
> 8 <t:label for="members"/>:
> 9 <t:select t:id="members" value="membersName"
> model="MemberSelectModel" encoder="wholeSaleMemberEncoder" />
> 10 <t:submit value="save"/>
> 11 </form>
> 12
> 13 <p:sidebar>
> 14 <t:pagelink
> page="wholesalemember/CreateWholeSaleMember">Create
> W.Sale Member</t:pagelink>
>
> location
> classpath:com/kids/crm/pages/wholesalemember/CreateWMemberTruck.tml,
> line 9
>
> # java.lang.NullPointerException
>
> Hide uninteresting stack frames Stack trace
>
> *
>
> org.apache.tapestry5.internal.util.SelectModelRenderer.option(SelectModelRenderer.java:51)
>
>
> --
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>
--
Jonathan Barker
ITStrategic
