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내 Spring-jsf 응용 프로그램을 실행할 때 javax.faces.el.EvaluationException : java.lang.NullPointerException 오류가 발생했습니다. 코드 디버깅을 시도하고 "serviceIfc"초기화되지 않은 및 null, 나는 그것을 해결하는 방법을 알아낼 수 없다는 것을 발견했습니다. 도와주세요. 여기 내 LoginBean.java입니다javax.faces.el.EvaluationException : java.lang.NullPointerException 오류
@ManagedBean
public class LoginBean {
private String uname;
private String pwd;
private LoginServiceIfc serviceIfc;
public LoginServiceIfc getServiceIfc() {
return serviceIfc;
}
@Autowired
public void setServiceIfc(LoginServiceIfc serviceIfc) {
this.serviceIfc = serviceIfc;
System.out.println("setServiceIfc method inside LOginBean running...");
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public String doLogin()
{
if(uname=="" || pwd=="")
{
return "fail";
}
else
{
String str=serviceIfc.doLogin(uname,pwd);
return str;
}
}
}
다음과 같이 applicationcontext.xml의 일부는 다음과 같습니다 아래
<bean id="loginBean" class="com.bean.LoginBean" scope="session">
<property name="serviceIfc">
<ref bean="loginServiceIfc" />
</property>
</bean>
<bean id="loginServiceIfc" class="com.service.serviceImpl.login.LoginServiceImpl" scope="session">
<property name="daoIfc">
<ref bean="loginDaoIfc" />
</property>
</bean>
<bean id="loginDaoIfc" class="com.dao.daoImpl.login.LoginDaoImpl" scope="session">
</bean>
Apr 25, 2013 1:36:14 AM com.sun.faces.lifecycle.InvokeApplicationPhase execute
WARNING: #{loginBean.doLogin}: java.lang.NullPointerException
javax.faces.FacesException: #{loginBean.doLogin}: java.lang.NullPointerException
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 com.controller.LoginServlet.service(LoginServlet.java:34)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
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.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 25 more
Caused by: java.lang.NullPointerException
at com.bean.LoginBean.doLogin(LoginBean.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.el.parser.AstValue.invoke(AstValue.java:264)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 26 more