那些遇到过的问题

FreeMarker模板错误！在struts2

dev*_*day 5 java jsp freemarker struts2 struts-validation

我在课堂上使用基于sturts 2的基于注解的验证，同时使动作错误消失，我得到了这个奇怪的“ FreeMarker模板错误！”。这是我的实体类。

@Entity
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long userid;
    private String userPhoneNumber;
    private String userName;
    private String password;
    private String full_name;
    private String useremail;

    @OneToOne
    private userType usertypeid;

    public Long getUserid() {
        return userid;
    }

    public void setUserid(Long userid) {
        this.userid = userid;
    }

    public String getUserPhoneNumber() {
        return userPhoneNumber;
    }

    @RequiredStringValidator(message = "Enter Phone Number",type = ValidatorType.FIELD)
    public void setUserPhoneNumber(String userPhoneNumber) {
        this.userPhoneNumber = userPhoneNumber;
    }

    public String getUserName() {
        return userName;
    }

    @RequiredStringValidator(message = "Enter User Name",type = ValidatorType.FIELD)
    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    @RequiredStringValidator(message = "Enter Password",type = ValidatorType.FIELD)
    public void setPassword(String password) {
        this.password = password;
    }

    public String getFull_name() {
        return full_name;
    }

    @RequiredStringValidator(message = "Enter Full Name",type = ValidatorType.FIELD)
    public void setFull_name(String full_name) {
        this.full_name = full_name;
    }

    public String getUseremail() {
        return useremail;
    }

    @RequiredStringValidator(message = "Enter Email Id",type = ValidatorType.FIELD)
    @EmailValidator(message = "Enter Valid Email Id",type = ValidatorType.FIELD)
    public void setUseremail(String useremail) {
        this.useremail = useremail;
    }

    public userType getUsertypeid() {
        return usertypeid;
    }

    public void setUsertypeid(userType usertypeid) {
        this.usertypeid = usertypeid;
    }

}
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这是我的Struts.xml文件操作代码

@Entity
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long userid;
    private String userPhoneNumber;
    private String userName;
    private String password;
    private String full_name;
    private String useremail;

    @OneToOne
    private userType usertypeid;

    public Long getUserid() {
        return userid;
    }

    public void setUserid(Long userid) {
        this.userid = userid;
    }

    public String getUserPhoneNumber() {
        return userPhoneNumber;
    }

    @RequiredStringValidator(message = "Enter Phone Number",type = ValidatorType.FIELD)
    public void setUserPhoneNumber(String userPhoneNumber) {
        this.userPhoneNumber = userPhoneNumber;
    }

    public String getUserName() {
        return userName;
    }

    @RequiredStringValidator(message = "Enter User Name",type = ValidatorType.FIELD)
    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    @RequiredStringValidator(message = "Enter Password",type = ValidatorType.FIELD)
    public void setPassword(String password) {
        this.password = password;
    }

    public String getFull_name() {
        return full_name;
    }

    @RequiredStringValidator(message = "Enter Full Name",type = ValidatorType.FIELD)
    public void setFull_name(String full_name) {
        this.full_name = full_name;
    }

    public String getUseremail() {
        return useremail;
    }

    @RequiredStringValidator(message = "Enter Email Id",type = ValidatorType.FIELD)
    @EmailValidator(message = "Enter Valid Email Id",type = ValidatorType.FIELD)
    public void setUseremail(String useremail) {
        this.useremail = useremail;
    }

    public userType getUsertypeid() {
        return usertypeid;
    }

    public void setUsertypeid(userType usertypeid) {
        this.usertypeid = usertypeid;
    }

}
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这是我的jsp页面

<action name="saveorupdate" class="com.elegant.purchasemodule.purchasemasters.user.UserAction"
            method="saveOrUpdate">
    <interceptor-ref name="defaultStackHibernateStrutsValidation"/>
    <result name="input">/AddUser.jsp</result>
    <result name="success" type="redirect">userlist</result>
</action>
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提交表单后，即使我提供了有效的详细信息，它仍然显示此错误

 org.apache.jasper.JasperException: Expression eKey is undefined on line 32, column 23 in template/simple/fielderror.ftl. - Class: freemarker.core.TemplateObject
File: TemplateObject.java
Method: assertNonNull
Line: 125 - freemarker/core/TemplateObject.java:125:-1
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:570)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:457)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:164)
at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept    (AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:249)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept   (ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.googlecode.s2hibernate.struts2.plugin.interceptors.SessionTransactionInjectorInterceptor.intercept   (SessionTransactionInjectorInterceptor.java:157)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter   (StrutsPrepareAndExecuteFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
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And*_*ios 4

例外是告诉您在哪里查找错误：

org.apache.jasper.JasperException： template/simple/ fielderror.ftl中第 32 行第 23 列的表达式 eKey 未定义。- 类：freemarker.core.TemplateObject

罪魁祸首是一个fieldError拥有无与伦比的fieldName。经过测试（在评论中）后，结果是full_name，显然下划线在整个链中没有正确处理：

<s:textfield id="full_name" name="full_name" ... />
...
<s:fielderror fieldName="full_name" cssClass="alert-danger"/>
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full_name然后应该将其更改为fullName与变量及其 Getter 和 Setter 一样长才能工作：

<s:fielderror fieldName="fullName" cssClass="alert-danger"/>
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还要确保拥有所有最新且一致的 struts 库和插件，以及正确版本的外部依赖项（Hibernate 验证器等）

也就是说，我想给你一些关于变量命名的建议：

  1. 对于具有多个单词的变量，始终使用驼峰式命名法：passwordis password（单个单词，虽然是复合词），但是usernameanduseremail应该是userNameand userEmail。您对单个类的 6 个变量使用了 3 种不同的约定...

  2. 由于这些是 Class 的变量User，请避免变量名称中的冗余user： userid = id、username = name、userPhoneNumber = PhoneNumber 等...如果您这样做是为了提高 JSP 中的可读性，那么请避免使用<s:push>标记这可能会令人困惑。

如果您刚开始，更改数据库列名称应该不会很痛苦...否则，请为您的下一个项目保留此建议。

PS：请注意，使用 JPA 和 Hibernate，您可以通过 persistence.xml 中的此设置自动使用驼峰命名法变量和带下划线的列名称（phoneNumber在实体中、在数据库中）：phone_number

<property name="hibernate.ejb.naming_strategy"
         value="org.hibernate.cfg.ImprovedNamingStrategy" />
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  • 尝试从 full_name 中删除该名称，看看它是否是罪魁祸首。我没有主意了，如果你有另一个 WAR 可以工作，请仔细检查配置、库、注释、jsp 代码中的每个差异...... (2认同)
  • 感谢上帝终于解决了。罪魁祸首是full_name。刚刚删除了该变量的验证。我不知道为什么和下划线引起了一个大问题。非常感谢您不断的帮助和耐心聆听我的业余言论。 (2认同)

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