javax.el.PropertyNotFoundException

[Shalabh Vyas]

I had an exception while creating testing a JPA entity from JSF.Following are the steps I followed:

1.I created an JPA Entity class Employee.java as shown below.
2.I created a database on MySQL, data source and a persistence unit.
3.I then chose the option of creating JSF pages from Entity Classes in NetBeans 6.7.1.

When I run the project and try creating a New Employee, I get the javax.el.PropertyNotFound exception saying that jpa.entities.Employee does not contain property 'serialversionUID'. The serialVersionUID field was already created in the Entity class. Could anybody please explain why such exception is being thrown?

I've also posted the exception from the Server log.

Employee.java

  
package jpa.entities;

import java.io.Serializable;
import java.util.Collection;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;


@Entity
@Table(name="EMPLOYEE")
@NamedQueries({@NamedQuery(name="Employee.findAll",query="SELECT e FROM Employee e"),@NamedQuery(name="Employee.findByName",query="SELECT e FROM Employee e WHERE e.name=:name")})
public class Employee implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * @return the serialVersionUID
     */
    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name="EMPLOYEE_ID")
    private Long id;

    @Column(name="NAME")
    private String name;

    @OneToMany(mappedBy="createdBy")
    private Collection<Note> noteCollection;

    @OneToMany(mappedBy="createdBy")
    private Collection<Note> timesheetCollection;
    
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }


    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the noteCollection
     */
    public Collection<Note> getNoteCollection() {
        return noteCollection;
    }

    /**
     * @param noteCollection the noteCollection to set
     */
    public void setNoteCollection(Collection<Note> noteCollection) {
        this.noteCollection = noteCollection;
    }

    /**
     * @return the timesheetCollection
     */
    public Collection<Note> getTimesheetCollection() {
        return timesheetCollection;
    }

    /**
     * @param timesheetCollection the timesheetCollection to set
     */
    public void setTimesheetCollection(Collection<Note> timesheetCollection) {
        this.timesheetCollection = timesheetCollection;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (getId() != null ? getId().hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Employee)) {
            return false;
        }
        Employee other = (Employee) object;
        if ((this.getId() == null && other.getId() != null) || (this.getId() != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "jpa.entities.Employee[id=" + getId() + "][Name:"+getName()+"]";
    }
}

Exception from Server log

 
[#|2009-08-16T20:55:13.890+0530|SEVERE|sun-appserver2.1|javax.enterprise.system.container.web|_ThreadID=72;_ThreadName=httpSSLWorkerThread-8080-0;_RequestID=468468c9-7346-42f5-8a7a-df1e4fc90142;|StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
javax.el.PropertyNotFoundException: The class 'jpa.entities.Employee' does not have the property 'serialVersionUID'.
	at javax.el.BeanELResolver.getBeanProperty(BeanELResolver.java:579)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:281)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175)
	at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
	at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
	at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:206)
	at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
	at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:279)
	at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:242)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
	at javax.faces.render.Renderer.encodeChildren(Renderer.java:137)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
	at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:245)
	at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:176)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
	at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
|#]

[Cameron Wallace McKenzie]

It's because it's a static method, I believe.

Why are you exposing the serialzation id? There's really no need.

-Cameron McKenzie