4

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)


log file rotation...
4

2 回答 2

5

我不明白为什么它第一次起作用，但就像 Nicolas Labrot 我看不到你设置你的主键，这就是为什么你得到一个主键是 Exception 的原因null。如果您将密钥设置在其他地方，请检查它是否可能为 0。如果您未在 persistence.xml 中设置以下属性，Eclipselink 不支持将 0 作为主键，您将得到该异常。

<property name="eclipselink.allow-zero-id" value="true"/>

该属性只是告诉 EclipseLink 将 '0' 视为有效的主键，而不是null.

于 2014-10-16T09:37:43.710 回答
1

不推荐使用eclipselink.allow-zero-id属性，因此您应该使用eclipselink.id-validation来定义哪些主键组件值被视为无效。

<property name="eclipselink.id-validation" value="NULL"/>

请参阅：https ://www.eclipse.org/eclipselink/documentation/2.4/jpa/extensions/p_id_validation.htm

于 2021-03-24T12:45:55.227 回答