public class LoginAction extends ActionSupport {

   

	private Account account;

	private LoginService loginService;







	public String execute() throws Exception{

		

		Account user=loginService.find(account.getUsername(), account.getPassword());

		if(user!=null){

			return "success";

		}else{

			return "error";

		}

	}

	

	

	public LoginService getLoginService() {

		return loginService;

	}



	public void setLoginService(LoginService loginService) {

		this.loginService = loginService;

	}

	

	public Account getAccount() {

		return account;

	}



	public void setAccount(Account account) {

		this.account = account;

	}

	

	

}

 <package name="login" extends="struts-default">

      <action name="login" class="loginAction" >

         

         <result name="error">/fail.jsp</result>

         <result name="success">/success.jsp</result>

      </action>

    </package>

HTTP Status 500 - 



--------------------------------------------



type Exception report



message 



description The server encountered an internal error () that prevented it from fulfilling this request.



exception 



java.lang.NullPointerException

	com.test.action.LoginAction.execute(LoginAction.java:21)

	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

	java.lang.reflect.Method.invoke(Method.java:597)

	com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)

	com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)

	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)

	com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)

	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)

	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)

	com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)

	org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)

	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)

	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)

	com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)

	c