PrimeFaces无法从dataTable的所选行中获取布尔值 [英] PrimeFaces can't get boolean value from dataTable's selected row

问题描述

我有PrimeFaces 3.5，JSF 2.2，Hibernate 4网络应用程序。

home.xhtml包含一个用于3个实体（用户，计算机，应用程序）和添加/编辑/删除按钮的嵌套数据表的Tabview。每个按钮都应该用一个表单来调用一个对话框并提交/取消按钮。

问题是我无法从selectedApplication显示正确的布尔值（licenseRequired）尝试以与设置相同的方式编辑它，我收到消息：

  /pages/home.xhtml @ 424,149 value =＃{homeBean.selectedApplication.licenseRequired}：目标无法访问，selectedApplication返回null 
  

如果我删除了负责licenseRequired字段的代码，一切正常，我得到其他选定的值没有任何问题：

这是一个对话框，导致NPE在这个字段上： / p>

 < p：dialog id =editAppDialogheader =Editdraggable =trueclosable =falsemodal = true
 widgetVar =dlg6width =600> 
 
< h：form id =dlg6form> 
< h：panelGrid id =panel6columns =3> 
< h：outputLabel for =appName2value =Name：/> 
< p：inputText id =appName2required =truevalue =＃{homeBean.selectedApplication.appName}
 label =Name> 
< f：validator binding =＃{uniqueApplicationValidator}/> 
< / p：inputText> 
< p：message for =appName2/> 
 
< h：outputLabel for =vendorName2value =Vendor：/> 
< p：inputText id =vendorName2value =＃{homeBean.selectedApplication.vendorName}
 label =Vendorrequired =true/> 
< p：message for =vendorName2/> 
 
< h：outputLabel for =appLicense2value =需要许可证：/> 
< p：selectOneMenu id =appLicense2required =truestyle =width：80px; value =＃{homeBean.selectedApplication.licenseRequired}> 
< f：selectItem itemLabel =trueitemValue =＃{true}/> 
< f：selectItem itemLabel =falseitemValue =＃{false}/> 
< / p：selectOneMenu> 
< p：message for =appLicense2/> 
 
 
< / h：panelGrid> 
 
< p：commandButton type =buttonvalue =取消onclick =dlg6.hide（）/> 
 
< p：commandButton value =OKprocess =@ formupdate =：dlg6form：panel6，：tab：applicationsaction =＃{homeBean.editApplication}
 oncomplete =if（args& amp; amp;！args.validationFailed）dlg6.hide（）/> 
< / h：form> 
 
< / p：dialog> 
  

Application.java：

  @Entity 
 @Table（name =applications，catalog =adminportal）
 public class应用程序实现Serializable {
 
 @Id @GeneratedValue （strategy = IDENTITY）
 @Column（name =app_id，unique = true，nullable = false）
 private Integer appId; 
 
 @Column（name =app_name，nullable = false）
 private String appName; 
 
 @Column（name =vendor_name，nullable = false）
 private String vendorName; 
 
 @Column（name =license_required，nullable = false，columnDefinition =BIT，length = 1）
 private boolean licenseRequired; 
 
 @OneToMany（fetch = FetchType.LAZY，mappedBy =applications）
 private Set< ComputerApp> computerApps = new HashSet（0）; 
 
 
 public Integer getAppId（）{
 return appId; 
} 
 
 public void setAppId（Integer appId）{
 this.appId = appId; 
} 
 
 public String getAppName（）{
 return appName; 
} 
 
 public void setAppName（String appName）{
 this.appName = appName; 
} 
 
 public String getVendorName（）{
 return vendorName; 
} 
 
 public void setVendorName（String vendorName）{
 this.vendorName = vendorName; 
} 
 
 public设置< ComputerApp> getComputerApps（）{
 return computerApps; 
} 
 
 public void setComputerApps（Set< ComputerApp> computerApps）{
 this.computerApps = computerApps; 
} 
 
 public boolean isLicenseRequired（）{
 return licenseRequired; 
} 
 
 public void setLicenseRequired（boolean licenseRequired）{
 this.licenseRequired = licenseRequired; 
} 
 
} 
  

HomeBean.java：

  package com.infostroy.adminportal.controller.bean; 
 
 import com.infostroy.adminportal.bean.BaseBean; 
 import com.infostroy.adminportal.model.Application; 
 import com.infostroy.adminportal.model.Computer; 
 import com.infostroy.adminportal.model.User; 
 import java.io.IOException; 
 import java.security.NoSuchAlgorithmException; 
 import java.util.List; 
 import javax.annotation.PostConstruct; 
 import org.primefaces.context.RequestContext; 
 import org.primefaces.event.SelectEvent; 
 import org.springframework.context.annotation.Scope; 
 import org.springframework.stereotype.Component; 
 
 @Component 
 @Scope（session）
 public class HomeBean extends BaseBean {
 
 private static final String editUserBtn =tab：form1： editUser; 
 private static final String deleteUserBtn =tab：form1：deleteUser; 
 private static final String editCompBtn =tab：form2：editComp; 
 private static final String deleteCompBtn =tab：form2：deleteComp; 
 private static final String editAppBtn =tab：form3：editApp; 
 private static final String deleteAppBtn =tab：form3：deleteApp; 
 
私人列表<用户>用户; 
私人列表<计算机>电脑; 
私人列表<应用程序>申请; 
 private用户selectedUser，newUser; 
私人电脑selectedComputer，newComputer; 
私人应用程序selectedApplication，newApplication; 
 private String deleteUserMsg，deleteCompMsg，deleteAppMsg; 
 private RequestContext rc; 
 
 @PostConstruct 
 public void init（）{
 setUsers（hibernateDBManager.getAllUsers（））; 
 setComputers（hibernateDBManager.getAllComputers（））; 
 setApplications（hibernateDBManager.getAllApplications（））; 
 newUser = new User（）; 
 newComputer = new Computer（）; 
 newApplication = new Application（）; 
 rc = RequestContext.getCurrentInstance（）; 
} 
 
 public void addUser（）throws NoSuchAlgorithmException {
 if（hibernateDBManager.insertUser（newUser））{
 users.add（newUser）; 
 newUser = new User（）; 
 updateUserButtons（）; 
} 
} 
 
 public void editUser（）throws NoSuchAlgorithmException {
 if（hibernateDBManager.updateUser（selectedUser））{
 users.set（users。 indexOf（selectedUser），selectedUser）; 
 selectedUser = null; 
 updateUserButton（）; 
} 
} 
 
 public void deleteUser（）throws IOException {
 if（selectedUser！= null）{
 if（hibernateDBManager.deleteUserById（selectedUser。 getUserId（））> 0）{
 users.remove（selectedUser）; 
 selectedUser = null; 
 updateUserButtons（）; 
} 
} 
} 
 
 public void addComputer（）{
 if（newComputer！= null&&&hibernateDBManager.insertComputer（newComputer） {
computer.add（newComputer）; 
 newComputer = new Computer（）; 
 updateCompButtons（）; 
} 
} 
 
 public void editComputer（）{
 if（hibernateDBManager.updateComputer（selectedComputer））{
 computers.set（computers.indexOf selectedComputer）; 
 selectedComputer = null; 
 updateCompButtons（）; 
} 
} 
 
 public void deleteComputer（）{
 if（selectedComputer！= null）{
 if（hibernateDBManager.deleteComputerById（selectedComputer.getComputerId ））> 0）{
 computers.remove（selectedComputer）; 
 selectedComputer = null; 
 updateCompButtons（）; 
} 
} 
} 
 
 public void addApplication（）{
 if（newApplication！= null&&&hibernateDBManager.insertApplication（newApplication）） {
 applications.add（newApplication）; 
 newApplication = new Application（）; 
 updateAppButtons（）; 
} 
} 
 
 public void editApplication（）{
 if（hibernateDBManager.updateApplication（selectedApplication））{
 applications.set（applications.indexOf selectedApplication），selectedApplication）; 
 selectedApplication = null; 
 updateAppButtons（）; 
} 
} 
 
 public void deleteApplication（）{
 if（selectedApplication！= null）{
 if（hibernateDBManager.deleteApplicationById（selectedApplication.getAppId ））> 0）{
 applications.remove（selectedApplication）; 
 selectedApplication = null; 
 updateAppButtons（）; 
} 
} 
} 
 
 public void onUserRowSelect（SelectEvent event）{
 setSelectedUser（（User）event.getObject（））; 
 setDeleteUserMsg（你确定要删除用户
 + selectedUser.getFirstName（）++ selectedUser.getLastName（）+？）; 
} 
 
 public void onCompRowSelect（SelectEvent event）{
 setSelectedComputer（（Computer）event.getObject（））; 
 deleteCompMsg =你确定要删除电脑
 + selectedComputer.getComputerName（）
 +（+ selectedComputer.getIpAddress（）+）？ 
} 
 
 public void onAppRowSelect（SelectEvent event）{
 setSelectedApplication（（Application）event.getObject（））; 
 deleteAppMsg =您确定要删除应用程序
 + selectedApplication.getAppName（）+？; 
} 
 
 protected void updateUserButtons（）{
 rc.update（editUserBtn）; 
 rc.update（deleteUserBtn）; 
} 
 
 protected void updateCompButtons（）{
 rc.update（editCompBtn）; 
 rc.update（deleteCompBtn）; 
} 
 
保护void updateAppButtons（）{
 rc.update（editAppBtn）; 
 rc.update（deleteAppBtn）; 
} 
 
 public String getDeleteUserMsg（）{
 return deleteUserMsg; 
} 
 
 public void setDeleteUserMsg（String deleteUserMsg）{
 this.deleteUserMsg = deleteUserMsg; 
} 
 
 public String getDeleteCompMsg（）{
 return deleteCompMsg; 
} 
 
 public void setDeleteCompMsg（String deleteCompMsg）{
 this.deleteCompMsg = deleteCompMsg; 
} 
 
 public String getDeleteAppMsg（）{
 return deleteAppMsg; 
} 
 
 public void setDeleteAppMsg（String deleteAppMsg）{
 this.deleteAppMsg = deleteAppMsg; 
} 
 //其他getters / setters 
 
} 
  

我需要做的是创建一个selectBoolean / selectOneMenu或一些simmilar，它只允许从2个选项（true / false）中进行选择。喜欢用户表（角色字段），它被设置为当前selectedUser的角色：

如果我替换

 code>< p：selectOneMenu id =appLicense2required =truestyle =width：80px; value =＃{homeBean.selectedApplication.licenseRequired}> 
< f：selectItem itemLabel =trueitemValue =＃{true}/> 
< f：selectItem itemLabel =falseitemValue =＃{false}/> 
< / p：selectOneMenu> 
  

简单

 code>< p：inputText id =appLicense2value =＃{homeBean.selectedApplication.licenseRequired}/> 
  

然后一切正常，我显示正确的值。但是这并不适合，因为我只需要从2个允许的值中选择，而不是输入随机文本。

任何想法如何解决这个问题？每一个答案都非常感谢！

谢谢。

解决方案

只是一个假设，是一个布尔空转换错误。

尝试初始化变量，如下所示：

  @Column（name =license_required，nullable = false，columnDefinition =BIT，length = 1）
 private boolean licenseRequired = false; 
  

I have PrimeFaces 3.5, JSF 2.2, Hibernate 4 web app.

home.xhtml contains a tabview with nested dataTables for 3 entities (Users, Computer, Applications) and add/edit/delete buttons. Each button is supposed to call a dialog with a form and submit/cancel buttons.

The problem is that I can't display correctly boolean value (licenseRequired) from selectedApplication when trying to edit it in the same way as it was set, I get the message:

/pages/home.xhtml @424,149 value="#{homeBean.selectedApplication.licenseRequired}": Target Unreachable, 'selectedApplication' returned null

If I remove the piece of code that is responsible for licenseRequired field, everything works correctly and I get other selected values without any problems:

Here's the dialog form, which causes NPE on this field:

    <p:dialog id="editAppDialog" header="Edit" draggable="true" closable="false" modal="true"
          widgetVar="dlg6" width="600" >

    <h:form id="dlg6form">
        <h:panelGrid id="panel6" columns="3">
            <h:outputLabel for="appName2" value="Name: "/>
            <p:inputText id="appName2" required="true" value="#{homeBean.selectedApplication.appName}" 
                         label="Name">
                <f:validator binding="#{uniqueApplicationValidator}"/>
            </p:inputText>
            <p:message for="appName2"/>

            <h:outputLabel for="vendorName2" value="Vendor: "/>
            <p:inputText id="vendorName2" value="#{homeBean.selectedApplication.vendorName}"
                         label="Vendor" required="true" />
            <p:message for="vendorName2"/>

            <h:outputLabel for="appLicense2" value="Requires license: "/>
            <p:selectOneMenu id="appLicense2" required="true" style="width: 80px;" value="#{homeBean.selectedApplication.licenseRequired}" >
                <f:selectItem itemLabel="true" itemValue="#{true}" />
                <f:selectItem itemLabel="false" itemValue="#{false}" />
            </p:selectOneMenu>
            <p:message for="appLicense2"/>


        </h:panelGrid>

        <p:commandButton type="button" value="Cancel" onclick="dlg6.hide()" />

        <p:commandButton value="OK" process="@form" update=":dlg6form:panel6, :tab:applications" action="#{homeBean.editApplication}"
                         oncomplete="if (args &amp;&amp; !args.validationFailed) dlg6.hide()"/>
    </h:form>

</p:dialog>

Application.java:

@Entity
@Table(name="applications", catalog="adminportal")
public class Application  implements Serializable {

    @Id @GeneratedValue(strategy=IDENTITY)
    @Column(name="app_id", unique=true, nullable=false)
     private Integer appId;

    @Column(name="app_name", nullable=false)
     private String appName;

    @Column(name="vendor_name", nullable=false)
     private String vendorName;

    @Column(name="license_required", nullable=false, columnDefinition = "BIT", length = 1)
     private boolean licenseRequired;

    @OneToMany(fetch=FetchType.LAZY, mappedBy="applications")
     private Set<ComputerApp> computerApps = new HashSet<>(0);


    public Integer getAppId() {
        return appId;
    }

    public void setAppId(Integer appId) {
        this.appId = appId;
    }

    public String getAppName() {
        return appName;
    }

    public void setAppName(String appName) {
        this.appName = appName;
    }

    public String getVendorName() {
        return vendorName;
    }

    public void setVendorName(String vendorName) {
        this.vendorName = vendorName;
    }

    public Set<ComputerApp> getComputerApps() {
        return computerApps;
    }

    public void setComputerApps(Set<ComputerApp> computerApps) {
        this.computerApps = computerApps;
    }

    public boolean isLicenseRequired() {
        return licenseRequired;
    }

    public void setLicenseRequired(boolean licenseRequired) {
        this.licenseRequired = licenseRequired;
    }

}

HomeBean.java:

package com.infostroy.adminportal.controller.bean;

import com.infostroy.adminportal.bean.BaseBean;
import com.infostroy.adminportal.model.Application;
import com.infostroy.adminportal.model.Computer;
import com.infostroy.adminportal.model.User;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import javax.annotation.PostConstruct;
import org.primefaces.context.RequestContext;
import org.primefaces.event.SelectEvent;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope("session")
public class HomeBean extends BaseBean {

    private static final String editUserBtn = "tab:form1:editUser";
    private static final String deleteUserBtn = "tab:form1:deleteUser";
    private static final String editCompBtn = "tab:form2:editComp";
    private static final String deleteCompBtn = "tab:form2:deleteComp";
    private static final String editAppBtn = "tab:form3:editApp";
    private static final String deleteAppBtn = "tab:form3:deleteApp";

    private List<User> users;
    private List<Computer> computers;
    private List<Application> applications;
    private User selectedUser, newUser;
    private Computer selectedComputer, newComputer;
    private Application selectedApplication, newApplication;
    private String deleteUserMsg, deleteCompMsg, deleteAppMsg;
    private RequestContext rc;

    @PostConstruct
    public void init() {
        setUsers(hibernateDBManager.getAllUsers());
        setComputers(hibernateDBManager.getAllComputers());
        setApplications(hibernateDBManager.getAllApplications());
        newUser = new User();
        newComputer = new Computer();
        newApplication = new Application();
        rc = RequestContext.getCurrentInstance();
    }

    public void addUser() throws NoSuchAlgorithmException {
        if (hibernateDBManager.insertUser(newUser)) {
            users.add(newUser);
            newUser = new User();
            updateUserButtons();
        }
    }

    public void editUser() throws NoSuchAlgorithmException {
        if (hibernateDBManager.updateUser(selectedUser)) {
            users.set(users.indexOf(selectedUser), selectedUser);
            selectedUser = null;
            updateUserButtons();
        }
    }

    public void deleteUser() throws IOException {
        if (selectedUser != null) {
            if (hibernateDBManager.deleteUserById(selectedUser.getUserId()) > 0) {
                users.remove(selectedUser);
                selectedUser = null;
                updateUserButtons();
            }
        }
    }

    public void addComputer() {
        if (newComputer != null && hibernateDBManager.insertComputer(newComputer)) {
            computers.add(newComputer);
            newComputer = new Computer();
            updateCompButtons();
        }
    }

    public void editComputer() {
        if (hibernateDBManager.updateComputer(selectedComputer)) {
            computers.set(computers.indexOf(selectedComputer), selectedComputer);
            selectedComputer = null;
            updateCompButtons();
        }
    }

    public void deleteComputer() {
        if (selectedComputer != null) {
            if (hibernateDBManager.deleteComputerById(selectedComputer.getComputerId()) > 0) {
                computers.remove(selectedComputer);
                selectedComputer = null;
                updateCompButtons();
            }
        }
    }

    public void addApplication() {
        if (newApplication != null && hibernateDBManager.insertApplication(newApplication)) {
            applications.add(newApplication);
            newApplication = new Application();
            updateAppButtons();
        }
    }

    public void editApplication() {
        if (hibernateDBManager.updateApplication(selectedApplication)) {
            applications.set(applications.indexOf(selectedApplication), selectedApplication);
            selectedApplication = null;
            updateAppButtons();
        } 
    }

    public void deleteApplication() {
        if (selectedApplication != null) {
            if (hibernateDBManager.deleteApplicationById(selectedApplication.getAppId()) > 0) {
                applications.remove(selectedApplication);
                selectedApplication = null;
                updateAppButtons();
            }
        }
    }

    public void onUserRowSelect(SelectEvent event) {
        setSelectedUser((User) event.getObject());
        setDeleteUserMsg("Are you sure you want to delete user "
                + selectedUser.getFirstName() + " " + selectedUser.getLastName() + "?");
    }

    public void onCompRowSelect(SelectEvent event) {
        setSelectedComputer((Computer) event.getObject());
        deleteCompMsg = "Are you sure you want to delete computer "
                + selectedComputer.getComputerName()
                + " (" + selectedComputer.getIpAddress() + ") ?";
    }

    public void onAppRowSelect(SelectEvent event) {
        setSelectedApplication((Application) event.getObject());
        deleteAppMsg = "Are you sure you want to delete application "
                + selectedApplication.getAppName() + "?";
    }

    protected void updateUserButtons() {
        rc.update(editUserBtn);
        rc.update(deleteUserBtn);
    }

    protected void updateCompButtons() {
        rc.update(editCompBtn);
        rc.update(deleteCompBtn);
    }

    protected void updateAppButtons() {
        rc.update(editAppBtn);
        rc.update(deleteAppBtn);
    }

    public String getDeleteUserMsg() {
        return deleteUserMsg;
    }

    public void setDeleteUserMsg(String deleteUserMsg) {
        this.deleteUserMsg = deleteUserMsg;
    }

    public String getDeleteCompMsg() {
        return deleteCompMsg;
    }

    public void setDeleteCompMsg(String deleteCompMsg) {
        this.deleteCompMsg = deleteCompMsg;
    }

    public String getDeleteAppMsg() {
        return deleteAppMsg;
    }

    public void setDeleteAppMsg(String deleteAppMsg) {
        this.deleteAppMsg = deleteAppMsg;
    }
    //Other getters/setters

}

What I need to do - is to make a selectBoolean/ selectOneMenu or something simmilar which lets to choose only from 2 options (true/ false). Like on users table (role field), which is set to the current selectedUser's role:

If I replace

                <p:selectOneMenu id="appLicense2" required="true" style="width: 80px;" value="#{homeBean.selectedApplication.licenseRequired}" >
                <f:selectItem itemLabel="true" itemValue="#{true}" />
                <f:selectItem itemLabel="false" itemValue="#{false}" />
            </p:selectOneMenu>

with simple

<p:inputText id="appLicense2" value="#{homeBean.selectedApplication.licenseRequired}"/>

then everything is working OK and I have the right values displayed. But this doesn't fit because I need to choose only from 2 allowed values, not enter random text.

Any ideas how to solve this issue? Every answer is highly appreciated!

Thank you.

解决方案

just a supposition, but maybe it is a boolean null conversion error.

try initializing the variable, like this:

@Column(name="license_required", nullable=false, columnDefinition = "BIT", length = 1)
private boolean licenseRequired = false;

这篇关于PrimeFaces无法从dataTable的所选行中获取布尔值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！