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java - 使用值 'userBean.password' 设置表达式 ['' 时出错,]

转载 作者:太空宇宙 更新时间:2023-11-04 06:24:09 26 4
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我同时使用 struts 2 和 tomcat。我面临的问题是:每当我提交数据时,无论是否错误(用户名和密码),它总是会出现以下字段错误:

.Error setting expression 'userBean.password' with value ['XXX', ]
.Error setting expression 'userBean.username' with value ['YYY', ]

其中“XXX”是密码,“YYY”是用户名。

我的 Action 类是:

package direstruts.action;

import static com.opensymphony.xwork2.Action.SUCCESS;
import direstruts.model.UserBean;

public class LoginAction extends GenericAction {

@Override
public void validate() {
UserBean uB = getUserBean();
if(uB.getUsername().isEmpty()) {
addFieldError("userBean.username", "Por favor Insira o Username de Utilizador");
}
if(uB.getPassword().isEmpty()) {
addFieldError("userBean.password", "Por favor Insira a Password de Utilizador");
}
}

public String getAuthentication() throws Exception {
if(getUserBean().getAuthentication()) {
addActionMessage("Log in bem Sucedido!");
return SUCCESS;
}
addActionError("Utilizador e/ou Password errados e/ou Utilizador já está logado");
return ERROR;
}

public String setNewUser() throws Exception {
if(getUserBean().setNewUser()) {
addActionMessage("User registado!");
return SUCCESS;
}
addActionError("Utilizador Já Existe! Tente Outro Username!");
return ERROR;
}
public String setQuitUser() throws Exception {
if(getUserBean().setQuitUser()) {
addActionMessage("User LoggedOut!");
return SUCCESS;
}
return ERROR;
}

public UserBean getUserBean() {
if(!session.containsKey("userBean"))
this.setUserBean(new UserBean());
return (UserBean) session.get("userBean");
}

public void setUserBean(UserBean userBean) {
session.put("userBean", userBean);
}
}

我的jsp是:

<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%><!DOCTYPE html>
<html>
<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="css/styles.css">
<title>MeeTO</title>
</head>
<body>

<s:form action="loginAction" method="post" >
<s:label cssClass="login" value="Please fill in the form below in order to Register or Log in:" /> <br>

<s:label for="userBean.username" value="Username:"/>
<s:textfield name="userBean.username" /> <br>

<s:label for="userBean.password" value="Password:"/>
<s:password name="userBean.password" /> <br>

<s:submit value="LogIn" action="loginAction" /> <br>
<s:submit value="Register" action="registerAction" /> <br>
</s:form>

<s:fielderror/>
<s:actionerror/>
<s:actionmessage/>
</body>
</

我的 bean 是:

package direstruts.model;

import cliente.replies.ReplyLogin;
import cliente.replies.ReplyObj;
import cliente.requests.lookup.GetAuthentication;
import cliente.requests.modify.SetNewUser;
import cliente.requests.modify.SetQuitUser;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.util.Properties;
import servidorRMI.ExecuteCommands;

public class UserBean {
ExecuteCommands eC;
private static String ip_RMI = "127.0.0.1";
private static int serverRMI = 1099;
private static InputStream in;
private String username;
private String password;
private int idUser;

public UserBean() {
readProperties();
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public int getIdUser() {
return this.idUser;
}

public void setIdUser(int idUser) {
this.idUser = idUser;
}

public boolean getAuthentication() {
GetAuthentication gA = new GetAuthentication(getUsername(), getPassword(), 0);
ReplyLogin rL = null;
boolean cond = false;
do{
try {
eC = (ExecuteCommands)Naming.lookup("rmi://" + ip_RMI + ":" + serverRMI + "/ServerRMI");
rL = eC.getAuthentication(gA);
cond = false;
} catch (RemoteException ex) {
System.err.println("Erro no servidor RMI Remote! A tentar restablecer a ligação!");
cond = true;
} catch (NotBoundException ex) {
System.err.println("Erro no servidor RMI NotBound! A tentar restablecer a ligação!");
cond = true;
} catch (MalformedURLException ex) {
System.err.println("Erro no servidor RMI MalformedURL! A tentar restablecer a ligação!");
cond = true;
}
} while(cond);
setIdUser(rL.getIdUser()); // Faz set ao idUser para poder ser usado nos pedidos subsequentes
return rL.isHasRegister();
}

public boolean setNewUser() {
SetNewUser sNU = new SetNewUser(getUsername(), getPassword(), 0);
boolean cond = false;
ReplyObj rO = null;
do{
try {
eC = (ExecuteCommands)Naming.lookup("rmi://" + ip_RMI + ":" + serverRMI + "/ServerRMI");
rO = eC.setNewUser(sNU);
cond = false;
} catch (RemoteException ex) {
System.err.println("Erro no servidor RMI Remote! A tentar restablecer a ligação!");
cond = true;
} catch (NotBoundException ex) {
System.err.println("Erro no servidor RMI NotBound! A tentar restablecer a ligação!");
cond = true;
} catch (MalformedURLException ex) {
System.err.println("Erro no servidor RMI MalformedURL! A tentar restablecer a ligação!");
cond = true;
}
} while(cond);
return rO.getSuccess();
}

public boolean setQuitUser() {
SetQuitUser sQU = new SetQuitUser(idUser, 0);
boolean cond = false;
ReplyObj rO = null;
do{
try {
eC = (ExecuteCommands)Naming.lookup("rmi://" + ip_RMI + ":" + serverRMI + "/ServerRMI");
rO = eC.setQuitUser(sQU);
cond = false;
} catch (RemoteException ex) {
System.err.println("Erro no servidor RMI Remote! A tentar restablecer a ligação!");
cond = true;
} catch (NotBoundException ex) {
System.err.println("Erro no servidor RMI NotBound! A tentar restablecer a ligação!");
cond = true;
} catch (MalformedURLException ex) {
System.err.println("Erro no servidor RMI MalformedURL! A tentar restablecer a ligação!");
cond = true;
}
} while(cond);
return rO.getSuccess();
}

static public void readProperties() {
try {
Properties properties = new Properties();
in = UserBean.class.getClassLoader().getResourceAsStream("app.properties");
properties.load(in);
ip_RMI = properties.getProperty("serverRMI.address");
serverRMI = Integer.parseInt (properties.getProperty("serverRMI.port"));
} catch(IOException e) {
System.err.println("Erro a ler o ficheiro .properties!");
} finally {
if(in != null) {
try {
in.close();
} catch(IOException e) {System.out.println("Erro a fechar!"); }
}
}
}
}

这是 Tomcat 日志:

19-Nov-2014 14:21:04.618 WARNING [http-apr-8080-exec-109] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.warn Parameter [action:loginAction] is on the excludeParams list of patterns!
19-Nov-2014 14:21:05.086 SEVERE [http-apr-8080-exec-109] null.null Notificação para o Desenvolvedor (altere o paramêtro struts.devMode para false para desabilitar esta mensagem):
Unexpected Exception caught setting 'userBean.password' on 'class direstruts.action.LoginAction: Error setting expression 'userBean.password' with value ['YYY', ]
19-Nov-2014 14:21:05.101 SEVERE [http-apr-8080-exec-109] null.null Notificação para o Desenvolvedor (altere o paramêtro struts.devMode para false para desabilitar esta mensagem):
Unexpected Exception caught setting 'userBean.username' on 'class direstruts.action.LoginAction: Error setting expression 'userBean.username' with value ['XXX', ]
19-Nov-2014 14:21:05.210 WARNING [http-apr-8080-exec-109] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.warn Caught an exception while evaluating expression 'userBean.username' against value stack
Caught an Ognl exception while getting property userBean - Class: ognl.OgnlRuntime
File: OgnlRuntime.java
Method: getMethodValue
Line: 1456 - ognl/OgnlRuntime.java:1456:-1
at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.getProperty(CompoundRootAccessor.java:143)
at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2317)
at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.ASTChain.getValueBody(ASTChain.java:141)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.Ognl.getValue(Ognl.java:494)
at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:255)
at com.opensymphony.xwork2.ognl.OgnlValueStack.getValue(OgnlValueStack.java:358)
at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValue(OgnlValueStack.java:347)
at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValueWhenExpressionIsNotNull(OgnlValueStack.java:322)
at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:308)
at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:366)
at com.opensymphony.xwork2.util.TextParseUtil$1.evaluate(TextParseUtil.java:157)
at com.opensymphony.xwork2.util.OgnlTextParser.evaluate(OgnlTextParser.java:49)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:167)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:112)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:85)
at org.apache.struts2.components.Component.findValue(Component.java:353)
at org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:813)
at org.apache.struts2.components.UIBean.end(UIBean.java:544)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
at org.apache.jsp.loginPage_jsp._jspx_meth_s_005ftextfield_005f0(loginPage_jsp.java:273)
at org.apache.jsp.loginPage_jsp._jspx_meth_s_005fform_005f0(loginPage_jsp.java:182)
at org.apache.jsp.loginPage_jsp._jspService(loginPage_jsp.java:114)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
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 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:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2403)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2392)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: ognl.OgnlException: userBean [java.lang.NullPointerException]
at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1456)
at ognl.ObjectPropertyAccessor.getPossibleProperty(ObjectPropertyAccessor.java:60)
at ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:147)
at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.getProperty(ObjectAccessor.java:17)
at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2317)
at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.getProperty(CompoundRootAccessor.java:138)
... 68 more
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at direstruts.model.UserBean.readProperties(UserBean.java:128)
at direstruts.model.UserBean.<init>(UserBean.java:27)
at direstruts.action.LoginAction.getUserBean(LoginAction.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:891)
at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1454)
... 73 more

19-Nov-2014 14:21:05.288 WARNING [http-apr-8080-exec-109] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.warn NOTE: Previous warning message was issued due to devMode set to true.
19-Nov-2014 14:21:05.429 WARNING [http-apr-8080-exec-109] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.warn Caught an exception while evaluating expression 'userBean.password' against value stack
Caught an Ognl exception while getting property userBean - Class: ognl.OgnlRuntime
File: OgnlRuntime.java
Method: getMethodValue
Line: 1456 - ognl/OgnlRuntime.java:1456:-1
at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.getProperty(CompoundRootAccessor.java:143)
at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2317)
at ognl.ASTProperty.getValueBody(ASTProperty.java:114)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.ASTChain.getValueBody(ASTChain.java:141)
at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
at ognl.SimpleNode.getValue(SimpleNode.java:258)
at ognl.Ognl.getValue(Ognl.java:494)
at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:255)
at com.opensymphony.xwork2.ognl.OgnlValueStack.getValue(OgnlValueStack.java:358)
at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValue(OgnlValueStack.java:347)
at com.opensymphony.xwork2.ognl.OgnlValueStack.tryFindValueWhenExpressionIsNotNull(OgnlValueStack.java:322)
at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:308)
at com.opensymphony.xwork2.ognl.OgnlValueStack.findValue(OgnlValueStack.java:366)
at com.opensymphony.xwork2.util.TextParseUtil$1.evaluate(TextParseUtil.java:157)
at com.opensymphony.xwork2.util.OgnlTextParser.evaluate(OgnlTextParser.java:49)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:167)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:112)
at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:85)
at org.apache.struts2.components.Component.findValue(Component.java:353)
at org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:813)
at org.apache.struts2.components.UIBean.end(UIBean.java:544)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
at org.apache.jsp.loginPage_jsp._jspx_meth_s_005fpassword_005f0(loginPage_jsp.java:313)
at org.apache.jsp.loginPage_jsp._jspx_meth_s_005fform_005f0(loginPage_jsp.java:191)
at org.apache.jsp.loginPage_jsp._jspService(loginPage_jsp.java:114)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
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 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:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2403)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2392)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: ognl.OgnlException: userBean [java.lang.NullPointerException]
at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1456)
at ognl.ObjectPropertyAccessor.getPossibleProperty(ObjectPropertyAccessor.java:60)
at ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:147)
at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.getProperty(ObjectAccessor.java:17)
at ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2317)
at com.opensymphony.xwork2.ognl.accessor.CompoundRootAccessor.getProperty(CompoundRootAccessor.java:138)
... 68 more
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at direstruts.model.UserBean.readProperties(UserBean.java:128)
at direstruts.model.UserBean.<init>(UserBean.java:27)
at direstruts.action.LoginAction.getUserBean(LoginAction.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:891)
at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1454)
... 73 more

19-Nov-2014 14:21:05.507 WARNING [http-apr-8080-exec-109] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.warn NOTE: Previous warning message was issued due to devMode set to true.

[编辑]我忘了提及我有一个 Action ,所有其他 Action 都延伸到其中。这是:

package direstruts.action;

import com.opensymphony.xwork2.ActionSupport;
import java.util.Map;
import org.apache.struts2.interceptor.SessionAware;

public class GenericAction extends ActionSupport implements SessionAware{
protected static final long serialVersionUID = 4L;
protected Map<String, Object> session;

@Override
public void setSession(Map<String, Object> session) {
this.session = session;
}
}

为了保留操作内存,GenericAction 实现了 SessionAware。这样可以吗?

最佳答案

正如Parameters Interceptor documentation中报道的那样(以及 explained in this answer ),异常(exception):

.Error setting expression 'userBean.password' with value ['XXX', ]

意味着您缺少二传手。

JavaBeans 约定规定您应该拥有一个具有同名 getter 和 setter 的属性,Struts2 遵循这些原则,通过反射进行内省(introspection)以概述您的 Action 对象。

你的代码中有什么?

public UserBean getUserBean() {
if(!session.containsKey("userBean"))
this.setUserBean(new UserBean());
return (UserBean) session.get("userBean");
}

public void setUserBean(UserBean userBean) {
session.put("userBean", userBean);
}

有点不标准,呃!

属性 private UserBean userBean; 甚至不存在,并且 getter 和 setter 正在执行奇怪的 session 操作(而它们甚至不应该有任何业务)。

更改为

private UserBean userBean;

public UserBean getUserBean() {
return userBean;
}

public void setUserBean(UserBean userBean) {
this.userBean = userBean;
}

它会起作用的。

然后,如果需要,找到另一种方法来处理 session 和对象(例如 prepare() 方法,甚至 execute())。

关于java - 使用值 'userBean.password' 设置表达式 ['' 时出错,],我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27019240/

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