相同的函数originalStrutsPortletAction.processAction（originalStrutsPortletAction，portletConfig，actionRequest，actionResponse）在从一个函数调用时工作正常，但在从另一个函数调用时不工作。虽然两个调用中的参数值相同。代码如下： -
public class ExampleLoginAction extends BaseStrutsPortletAction implements Serializable{
public static int flag=0;
public static StrutsPortletAction originalStrutsPortletAction=null;
public static PortletConfig portletConfig=null;
public static ActionRequest actionRequest=null;
public static ActionResponse actionResponse=null;
String email;
@Override
public void processAction(StrutsPortletAction originalStrutsPortletAction,
PortletConfig portletConfig, ActionRequest actionRequest,
ActionResponse actionResponse) throws Exception {
/**
* This is the custom process action
* Once you try to login this method will be invoked
* We can write our own logic here
* Invoke the original struts action at the end
*/
ExampleLoginAction.actionRequest=actionRequest;
ExampleLoginAction.originalStrutsPortletAction=originalStrutsPortletAction;
ExampleLoginAction.portletConfig=portletConfig;
ExampleLoginAction.actionResponse=actionResponse;
System.out.println("#############ExampleLoginAction###############");
//System.out.println(ParamUtil.getString(arg0, "login"));
// TODO Auto-generated method stub
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
//SecurityManager security = System.getSecurityManager();
//System.out.println("Security Manager" + security);
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("abhijain.cse@gmail.com","a17432475J@");
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("adesh.pathak01@gmail.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(ParamUtil.getString(actionRequest, "login")));
message.setSubject("Testing Subject");
int otp=new Random().nextInt(10000);
message.setText("Your OTP is " + otp);
OTP otpdemo=OTPLocalServiceUtil.createOTP(CounterLocalServiceUtil.increment());
otpdemo.setEmail(ParamUtil.getString(actionRequest, "login"));
otpdemo.setPassword(String.valueOf(otp));
OTPLocalServiceUtil.addOTP(otpdemo);
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
//portletConfig.getPortletContext().getRequestDispatcher("/jsp/otp.jsp").forward(actionRequest, actionResponse);
//actionResponse.setRenderParameter("email",ParamUtil.getString(actionRequest, "login"));
//actionRequest.setAttribute("password",ParamUtil.getString(actionRequest, "password"));
String email=ParamUtil.getString(actionRequest, "login");
this.email=email;
actionRequest.getPortletSession().setAttribute("email",email);
HttpServletRequest request=PortalUtil.getHttpServletRequest(actionRequest);
HttpSession session1=request.getSession();
session1.setAttribute("loginAction", this);
actionResponse.sendRedirect("/otpsample-hook/jsp/otp.jsp?email="+email+"&originalStrutsPortletAction="+originalStrutsPortletAction+"&actionRequest="+actionRequest+"&actionResponse="+actionResponse+"&portletConfig="+portletConfig+"&ExampleLoginAction="+this);
System.out.println("In processAction"+originalStrutsPortletAction);
System.out.println("In processAction"+portletConfig);
System.out.println("In processAction"+actionRequest);
System.out.println("In processAction"+actionResponse);
System.out.println("bye:::::::::");
//Thread.sleep(1000);
System.out.println(flag);
if(flag==1)
{
System.out.println("hello:::::::::");
originalStrutsPortletAction.processAction(
originalStrutsPortletAction, portletConfig, actionRequest,
actionResponse);
//flag=0;
}
//new MVCPortlet().getPortletContext().getRequestDispatcher("/jsp/otp.jsp").forward(actionRequest, actionResponse);
}
public String render(
StrutsPortletAction originalStrutsPortletAction,
PortletConfig portletConfig, RenderRequest renderRequest,
RenderResponse renderResponse)
throws Exception {
/**
* Our own render method
* This method is for rendering the view
* At the end call the original struts action
*/
System.out.println("##########Rendering view############");
renderResponse.getWriter().println("custom rendering of page");
// return null;
return originalStrutsPortletAction.render(
null, portletConfig, renderRequest, renderResponse);
// return null;
}
public static void check() throws Exception
{
System.out.println(":::::hi::::::");
System.out.println(originalStrutsPortletAction);
System.out.println(portletConfig);
System.out.println(actionRequest);
System.out.println(actionResponse);
originalStrutsPortletAction.processAction(originalStrutsPortletAction,
portletConfig, actionRequest,
actionResponse);
}
}
功能
originalStrutsPortletAction.processAction(originalStrutsPortletAction,
portletConfig, actionRequest,
actionResponse)
从processAction（）调用时工作正常但是当它在check（）方法中调用时，我得到空指针异常，尽管两者的参数值相同。我已经通过在两个函数中打印它们来检查参数值。它们是相同的。那么哪里可能是错误？我被困在其中一天但找不到解决方案。堆栈跟踪如下： -
java.lang.NullPointerException
at com.liferay.portlet.login.action.LoginAction.login(LoginAction.java:196)
at com.liferay.portlet.login.action.LoginAction.processAction(LoginAction.java:93)
at com.liferay.portal.struts.StrutsPortletActionAdapter.processAction(StrutsPortletActionAdapter.java:60)
at com.liferay.portal.kernel.struts.BaseStrutsPortletAction.processAction(BaseStrutsPortletAction.java:44)
at com.abhishek.ExampleLoginAction.check(ExampleLoginAction.java:196)
at org.apache.jsp.jsp.otpCheck_jsp._jspService(otpCheck_jsp.java:90)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
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 com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at sun.reflect.GeneratedMethodAccessor482.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67)
at com.sun.proxy.$Proxy642.doFilter(Unknown Source)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:165)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:96)
at com.liferay.portal.kernel.servlet.PortalClassLoaderFilter.doFilter(PortalClassLoaderFilter.java:74)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDoFilter(InvokerFilterChain.java:204)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:109)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分：0)
这可能是因为在每种情况下都会有一些不同的依赖关系被解决，具体取决于谁调用此方法。
在某些框架中，您有类似状态的东西，当请求到来时，服务器会初始化一些变量，例如特定用户的会话对象，您可以在其中存储一些信息。如果你从其他线程调用相同的方法而没有针对任何用户解析会话，那么你根本没有会话，它可能会失败。
但是这不仅限于会话，可能还有其他变量正在初始化（或不是），具体取决于谁调用该方法。