On Mon, 29. Jun 2009, Stephan Windmüller wrote: > The site is used to assign users to jobs. Each job has a java.util.List > of users assigned to it. Of course a user should not be assigned twice > to a job.
To clarify this I modified the example from http://wiki.apache.org/tapestry/Tapestry5HowtoSelectWithObjects ----- SelectTest.java package de.ls5.ocs.webclient.tapestry.pages; import java.util.ArrayList; import java.util.List; import org.apache.tapestry5.annotations.Persist; import org.apache.tapestry5.annotations.Property; import org.apache.tapestry5.annotations.SessionState; import org.apache.tapestry5.ioc.annotations.Inject; import org.apache.tapestry5.ioc.services.PropertyAccess; import de.ls5.ocs.backend.ConferenceController; import de.ls5.ocs.backend.User; import de.ls5.ocs.webclient.tapestry.services.GenericSelectModel; import de.ls5.ocs.webclient.tapestry.util.ASO; public class SelectTest { @Persist private List<User> assignments; @Inject private PropertyAccess _access; @Persist @Property private User selectedUser; @Inject private ConferenceController conferenceController; private GenericSelectModel<User> selectableUsers; void onActivate() { System.out.println("OnActivate"); if (assignments == null) { User emptyUSer = new User("None", "Undecided", "none"); System.out.println("Filling List"); assignments = new ArrayList<User>(); assignments.add(emptyUSer); assignments.add(emptyUSer); assignments.add(emptyUSer); } else { System.out.println("List was already filled with " + assignments.size() + " elements."); } // Getting NullPointerException if this is missing. Why? if (selectedUser == null) { System.out.println("Setting selectedUser"); selectedUser = new User("bla"); } } public SelectTest(){ selectableUsers = new GenericSelectModel<User>(DAO.getAllUsers(),User.class,"fullName","id",_access); } public List<User> getAssignments(){ return assignments; } public void setAssignments(List<User> assignments){ this.assignments = assignments; } public GenericSelectModel<User> getSelectableUsers(){ return selectableUsers; } } SelectTest.tml <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <title>Select test</title> </head> <body style="font-family:Courier new"> <form t:type="Form"> <table> <tr t:type="loop" t:source="assignments" t:encoder="selectableUsers" t:value="selectedUser"> <td> <t:select model="selectableUsers" encoder="selectableUsers" value="selectedUser"/> </td> </tr> </table> <t:submit/> </form> value: ${assignments} </body> </html> ----- As long as I do not use a List to store the objects, all works fine. But when I submit the form above, it always resets and the list consists of "undecided" users. Regards Stephan
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