CODEWITHSUNDEEP
javajspweb
cd6
cd6

Reputation: 357

Getting NullPointerException trying to access "response" in JSP

In a JSP page, when the user logs out, I'm deleting their login cookies using this code:

Cookie killMyCookie = new Cookie("cookie1", null);
killMyCookie.setMaxAge(0);
killMyCookie.setPath("/JSPLearn");
response.addCookie(killMyCookie);
killMyCookie = new Cookie("cookie2", null);
killMyCookie.setMaxAge(0);
killMyCookie.setPath("/JSPLearn");
response.addCookie(killMyCookie);

After this, I'm calling

response.sendRedirect("index.jsp");

It's throwing a NullPointerException.

Why would response be null?

Stacktrace:

java.lang.NullPointerException
at java.net.URLEncoder.encode(URLEncoder.java:205)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:175)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:403)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at  com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)

Upvotes: 1

Views: 4614

Answers (2)

Hardik Mishra
Hardik Mishra

Reputation: 14877

The answer lies at 

org.apache.jsp.index_jsp._jspService(index_jsp.java:175)

I think you are trying something like URLEncoder.encode and first argument which is string to be encoded is Null and it is throwing java.lang.NullPointerException

It should be something like

URLEncoder.encode("Hello World", "UTF-8");

Upvotes: 1

Mohammed Mohammed
Mohammed Mohammed

Reputation: 413

check your index.jsp file I think you have a requet.getParameter(""); for a variable and when you use redirect you should send a value for that variable.

Upvotes: 1

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