ManytoMany and h:selectOneMenu problem
Hello I want to do a manytomany relation two entity and i want using h:selectOneMenu but its giving this error :
avax.faces.component.UIInput updateModel
SEVERE: /employee.xhtml @26,76 value="#{employeeHome.instance.projects}": java.lang.IllegalArgumentException: argument type mismatch
java.lang.IllegalArgumentException: argument type mismatch package org.domain.ManytoMany.entity;
import java.io.Serializable;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;
import javax.persistence.ManyToMany;
import javax.persistence.Version;
import org.hibernate.validator.Length;
@Entity
public class Employee implements Serializable
{
// seam-gen attributes (you should probably edit these)
private Long id;
private Integer version;
private String name;
protected Set <Project> projects;
// add additional entity attributes
// seam-gen attribute getters/setters with annotations (you probably should edit)
@Id @GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Version
public Integer getVersion() {
return version;
}
private void setVersion(Integer version) {
this.version = version;
}
@Length(max = 20)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany(mappedBy="employees")
public Set<Project> getProjects() {
return projects;
}
public void setProjects(Set<Project> projects) {
this.projects = projects;
}
}
package org.domain.ManytoMany.entity;
import java.io.Serializable;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;
import javax.persistence.ManyToMany;
import javax.persistence.Version;
import org.hibernate.validator.Length;
@Entity
public class Project implements Serializable
{
// seam-gen attributes (you should probably edit these)
private Long id;
private Integer version;
private String name;
protected Set <Employee> employees;
// add additional entity attributes
// seam-gen attribute getters/setters with annotations (you probably should edit)
@Id @GeneratedValue
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Version
public Integer getVersion() {
return version;
}
private void setVersion(Integer version) {
this.version = version;
}
@Length(max = 20)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany
public Set<Employee> getEmployees() {
return employees;
}
public void setEmployees(Set<Employee> employees) {
this.employees = employees;
}
}
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:s="http://jboss.com/products/seam/taglib"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:rich="http://richfaces.org/rich"
template="layout/template.xhtml">
<ui:define name="body">
<h:form id="employeeForm">
<rich:panel>
<f:facet name="header">employee</f:facet>
<s:decorate id="nameField" template="layout/edit.xhtml">
<ui:define name="label">Name</ui:define>
<h:inputText id="name" required="true"
value="#{employeeHome.instance.name}"/>
</s:decorate>
<s:decorate id="projectField" template="layout/edit.xhtml">
<ui:define name="label">Project</ui:define>
<h:selectOneMenu value="#{employeeHome.instance.projects}">
<s:selectItems var="project" value="#{projectList.resultList}" label="#{project.name}"></s:selectItems>
<s:convertEntity></s:convertEntity>
</h:selectOneMenu>
</s:decorate>
<div style="clear:both"/>
</rich:panel>
<div class="actionButtons">
<h:commandButton id="save"
value="Save"
action="#{employeeHome.persist}"
rendered="#{!employeeHome.managed}"/>
<h:commandButton id="update"
value="Save"
action="#{employeeHome.update}"
rendered="#{employeeHome.managed}"/>
<h:commandButton id="delete"
value="Delete"
action="#{employeeHome.remove}"
immediate="true"
rendered="#{employeeHome.managed}"/>
<s:button propagation="end"
id="cancel"
value="Cancel"
view="/employeeList.xhtml"/>
</div>
</h:form>
</ui:define>
</ui:composition>
what is wrong ?
