Servlet problem

Question

jet101 0 Light Poster

14 Years Ago

Hi everyone...

Im having problems running my servlet using netbeans 6.8, It's just a simple Hello World application but I always encountered error "java.lang.NullPointerException", not sure why since the Hello World apps is already available in netbeans when you add a servlet. I dont have problems deploying my web-apps in JSP, JSTL and JavaBeans I can even connect to my DB(MySQL). please help! here's the error in my log file:

[#|2010-06-07T15:11:53.260+0800|WARNING|glassfishv3.0|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=30;_ThreadName=http-thread-pool-8080-(2);|StandardWrapperValve[jsp]: PWC1406: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
	at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:783)
	at org.apache.jsp.process_jsp._jspService(process_jsp.java from :76)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:406)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:483)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:373)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
	at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
	at java.lang.Thread.run(Thread.java:619)
|#]

[#|2010-06-07T15:11:53.260+0800|WARNING|glassfishv3.0|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=30;_ThreadName=Thread-1;|StandardWrapperValve[jsp]: PWC1406: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
	at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:783)
	at org.apache.jsp.process_jsp._jspService(process_jsp.java from :76)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:406)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:483)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:373)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
	at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
	at java.lang.Thread.run(Thread.java:619)
|#]

java-jsp

3 Contributors
4 Replies
162 Views
1 Month Discussion Span
Latest Post 14 Years Ago Latest Post by jet101

~s.o.s~ 2,560 Failure as a human

14 Years Ago

Difficult to say anything without looking at the JSP in consideration. You can also try taking a look at the generated servlet for your JSP (process_jsp.java).

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jet101 0 Light Poster · Answer 1 · 2010-06-08T09:18:15+00:00

@S.O.S: problem solve, im using an old reference book when netbeans is already using servlet 3.0. thanks anyways. ^_^

Member 785504 0 Newbie Poster · Answer 2 · 2010-07-07T16:31:43+00:00

Could you explain how you got to solve this exception. I have the same problem.

Thanks for all

jet101 0 Light Poster · Answer 3 · 2010-07-29T12:18:52+00:00

@785504

what I did was, delete processRequest method and use only doGet and doPost, I dont how it works but it works.. heheh. then instead of <form action="/servlet"> it should be <form action="servlet">.