每当我第一次通过单击说出在 outputText 中输入文本时，都不会发生异常，数据库中的所有内容都会更新，但是当我第二次单击说出按钮时，会出现以下异常。
1) 主页.xhtml
</div>
<div style="width:100%;background-color:#EEEEEE;">
<h:panelGrid columns="2">
<h:form>
<h:outputText value="Speak Out"/><br/>
<h:outputText value="Share whats in your mind.!" style="color:#aaaaaa;font-size:x-small;"/>
<p:inputTextarea name="content" id="sharetext" cols="60" rows="2" onclick="this.value='';" value="#{statusBean.status.statusmsg}" style="text-size:small;" /><br/>
<p:commandButton type="submit" value="Speak Out" action="#{statusBean.save}" ajax="false" styleClass="buttonstyle"/><br/>
</h:form>
<h:form>
<h:outputText value="Pic Out"/><br/>
<p:fileUpload fileUploadListener="#{statusBean.handleFileUpload}"/>
<h:outputText value="Share whats in your mind through an image.!" style="color:#aaaaaa;font-size:x-small;"/>
<p:inputTextarea name="content" id="sharetext" cols="60" rows="2" onclick="this.value='';" value="#{statusBean.status.picstatusdesc}" style="text-size:small;" /><br/>
<p:commandButton type="submit" value="Pic Out" action="#{statusBean.picSave}" ajax="false" styleClass="buttonstyle"/><br/>
</h:form>
</h:panelGrid>
</div>
2）StatusBean.java
public class StatusBean {
Date d;
Comment comment;
Status status;
private EntityManager em;
private UploadedFile uploadedFile;
public Comment getComment() {
return comment;
}
public void setComment(Comment comment) {
this.comment = comment;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public StatusBean() {
d = new Date();
comment = new Comment();
status = new Status();
EntityManagerFactory emf = Persistence
.createEntityManagerFactory("FreeBird");
em = emf.createEntityManager();
}
public String save() {
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) context.getExternalContext()
.getSession(true);
User user = (User) session.getAttribute("userdet");
status.setEmail(user.getEmail());
status.setStatusBy(user.getFirstName());
status.setTimeMillis(d.getTime());
status.setPicture(user.getImage());
System.out.println("status save called");
em.getTransaction().begin();
em.persist(status);
em.getTransaction().commit();
session.isNew();
return "success";
}
public String picSave() {
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) context.getExternalContext()
.getSession(true);
User user = (User) session.getAttribute("userdet");
status.setEmail(user.getEmail());
status.setStatusBy(user.getFirstName());
status.setTimeMillis(d.getTime());
status.setPicture(user.getImage());
System.out.println("picstatus save called");
em.getTransaction().begin();
em.persist(status);
em.getTransaction().commit();
session.isNew();
return "success";
}
public void handleFileUpload(FileUploadEvent e) {
System.out.println("file handler called");
uploadedFile = e.getFile();
String fileName = uploadedFile.getFileName();
fileName = fileName.substring(fileName.lastIndexOf("\\") + 1);
FacesContext context = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) context.getExternalContext()
.getSession(true);
System.out.println(fileName);
try {
ServletContext ctx = (ServletContext) FacesContext
.getCurrentInstance().getExternalContext().getContext();
String imagesPath = ctx.getRealPath("images");
FileOutputStream fos = new FileOutputStream(imagesPath
+ "/statusPicture/" + fileName);
fos.write(uploadedFile.getContents());
fos.flush();
fos.close();
status.setPicstatus(fileName);
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
3) 状态实体类
@Entity
public class Status implements Serializable,Comparable<Status> {
private static final long serialVersionUID = 1L;
@Id
private int statusId;
private String email;
private String picstatus;
private String picstatusdesc;
private String picture;
private String statusBy;
private String statusmsg;
private long timeMillis;
public Status() {
}
public int getStatusId() {
return this.statusId;
}
public void setStatusId(int statusId) {
this.statusId = statusId;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPicstatus() {
return this.picstatus;
}
public void setPicstatus(String picstatus) {
this.picstatus = picstatus;
}
public String getPicstatusdesc() {
return this.picstatusdesc;
}
public void setPicstatusdesc(String picstatusdesc) {
this.picstatusdesc = picstatusdesc;
}
public String getPicture() {
return this.picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
public String getStatusBy() {
return this.statusBy;
}
public void setStatusBy(String statusBy) {
this.statusBy = statusBy;
}
public String getStatusmsg() {
return this.statusmsg;
}
public void setStatusmsg(String statusmsg) {
this.statusmsg = statusmsg;
}
public long getTimeMillis() {
return this.timeMillis;
}
public void setTimeMillis(long l) {
this.timeMillis = l;
}
@Override
public int compareTo(Status o) {
return (int) (o.getTimeMillis()-this.getTimeMillis());
}
}
4) 堆栈跟踪
WARNING: #{statusBean.save}: javax.persistence.RollbackException: Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
javax.faces.FacesException: #{statusBean.save}: javax.persistence.RollbackException: Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: javax.persistence.RollbackException: Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 36 more
Caused by: javax.persistence.RollbackException: Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:102)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:63)
at com.bean.StatusBean.save(StatusBean.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 37 more
Caused by: Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
at org.eclipse.persistence.exceptions.ValidationException.nullPrimaryKeyInUnitOfWorkClone(ValidationException.java:1439)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChanges(DeferredChangeDetectionPolicy.java:107)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChangesForExistingObject(DeferredChangeDetectionPolicy.java:54)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(UnitOfWorkImpl.java:643)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1490)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:267)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1143)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:84)
... 47 more
WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
Local Exception Stack:
Exception [EclipseLink-7197] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Null or zero primary key encountered in unit of work clone [com.entity.Status@1523582], primary key [0]. Set descriptors IdValidation or the "eclipselink.id-validation" property.
at org.eclipse.persistence.exceptions.ValidationException.nullPrimaryKeyInUnitOfWorkClone(ValidationException.java:1439)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChanges(DeferredChangeDetectionPolicy.java:107)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.calculateChangesForExistingObject(DeferredChangeDetectionPolicy.java:54)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(UnitOfWorkImpl.java:643)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1490)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:267)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1143)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:84)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:63)
at com.bean.StatusBean.save(StatusBean.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
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