Need help on Session's null pointer exception
I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) at = org.apache.tomcat.facade.HttpSessionFacade.setAttribute(Unknown Sourc e) at org.apache.tomcat.facade.HttpSessionFacade.putValue(Unknown = Source) at = com.fub.its.servlet.SecuredServlet.setCurrentEmployee(SecuredServlet. java:162) at = com.fub.its.controller.DepartmentController.checkForSwitchToDepartmen t(DepartmentController.java:47) at = com.fub.its.controller.DepartmentController.doGet(DepartmentControlle r.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java) at = com.fub.its.servlet.ApplicationServlet.service(ApplicationServlet.jav a:160) at = com.fub.its.servlet.SecuredServlet.service(SecuredServlet.java:129) at javax.servlet.http.HttpServlet.service(HttpServlet.java) at org.apache.tomcat.facade.ServletHandler.doService(Unknown = Source) at org.apache.tomcat.core.Handler.invoke(Unknown Source) at org.apache.tomcat.core.Handler.service(Unknown Source) at org.apache.tomcat.facade.ServletHandler.service(Unknown = Source) at org.apache.tomcat.core.ContextManager.internalService(Unknown = Source) at org.apache.tomcat.core.ContextManager.service(Unknown Source) at = org.apache.tomcat.modules.server.Http10Interceptor.processConnection( Unknown Source) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown = Source) at = org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source) at java.lang.Thread.run(Thread.java:484) --End of System Error--- Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Need help on Session's null pointer exception
I think i got that error once when i tried to put a null Object into
session. do something like
if (Object != null){
session.putValue(key, Object);
}
-hope that helps,
Jimmy
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 04, 2001 2:26 PM
To: [EMAIL PROTECTED]
Subject: Need help on Session's null pointer exception
I run a servlet on Tomcat3.3 and got the following error:
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:380)
at org.apache.tomcat.core.ServerSession.setAttribute(Unknown =
Source)
at =
org.apache.tomcat.facade.HttpSessionFacade.setAttribute(Unknown Sourc
e)
at org.apache.tomcat.facade.HttpSessionFacade.putValue(Unknown =
Source)
at =
com.fub.its.servlet.SecuredServlet.setCurrentEmployee(SecuredServlet.
java:162)
at =
com.fub.its.controller.DepartmentController.checkForSwitchToDepartmen
t(DepartmentController.java:47)
at =
com.fub.its.controller.DepartmentController.doGet(DepartmentControlle
r.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java)
at =
com.fub.its.servlet.ApplicationServlet.service(ApplicationServlet.jav
a:160)
at =
com.fub.its.servlet.SecuredServlet.service(SecuredServlet.java:129)
at javax.servlet.http.HttpServlet.service(HttpServlet.java)
at org.apache.tomcat.facade.ServletHandler.doService(Unknown =
Source)
at org.apache.tomcat.core.Handler.invoke(Unknown Source)
at org.apache.tomcat.core.Handler.service(Unknown Source)
at org.apache.tomcat.facade.ServletHandler.service(Unknown =
Source)
at org.apache.tomcat.core.ContextManager.internalService(Unknown =
Source)
at org.apache.tomcat.core.ContextManager.service(Unknown Source)
at =
org.apache.tomcat.modules.server.Http10Interceptor.processConnection(
Unknown Source)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown =
Source)
at =
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown
Source)
at java.lang.Thread.run(Thread.java:484)
--End of System Error---
Can anyone kindly tell me what is wrong with my setting? I changed the
expiration time for session in server.xml
and I am sure the SessionIdGenerator is set too.
Bill
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Re: Need help on Session's null pointer exception
Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: Need help on Session's null pointer exception
Thank you for your reply, Denis. I am sure the value I try to put in a session is not null. We used Websphere and Tomcat 4.0.1 as our testing environment and the codes are running OK. Only when we tried to use Tomcat3.3 giving us this error message. We suspect either our setting in wrong or there is a bug in Tomcat3.3. Bill Denis Balazuc [EMAIL PROTECTED] on 12/04/2001 02:38:37 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] cc: Subject: Re: Need help on Session's null pointer exception Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Need help on Session's null pointer exception
The Servlet 2.2 spec states that neither the name or object may be null. This is the spec that Tomcat 3.3 is the reference implementation for. The Servlet 2.3 spec allows the object to be null, which is the equivalent of calling removeAttribute(). This is why the code works in Tomcat 4.0.1. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 2:51 PM To: [EMAIL PROTECTED] Subject: Re: Need help on Session's null pointer exception Thank you for your reply, Denis. I am sure the value I try to put in a session is not null. We used Websphere and Tomcat 4.0.1 as our testing environment and the codes are running OK. Only when we tried to use Tomcat3.3 giving us this error message. We suspect either our setting in wrong or there is a bug in Tomcat3.3. Bill Denis Balazuc [EMAIL PROTECTED] on 12/04/2001 02:38:37 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] cc: Subject: Re: Need help on Session's null pointer exception Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Need help on Session's null pointer exception
On Tue, 4 Dec 2001, Sobeck, James (ISS Atlanta) wrote:
Date: Tue, 4 Dec 2001 14:35:00 -0500
From: Sobeck, James (ISS Atlanta) [EMAIL PROTECTED]
Reply-To: Tomcat Users List [EMAIL PROTECTED]
To: 'Tomcat Users List' [EMAIL PROTECTED]
Subject: RE: Need help on Session's null pointer exception
I think i got that error once when i tried to put a null Object into
session. do something like
if (Object != null){
session.putValue(key, Object);
}
You should also note that in a Servlet 2.3 environment, calling:
session.setAttribute(key, null);
is semantically equivalent to calling:
session.removeAttribute(key);
The bottom line is that it's not legal to store null attributes -- and
this applies to request, session, and ServletContext attributes equally.
-hope that helps,
Jimmy
Craig
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RE: Need help on Session's null pointer exception
I am sure neither the name nor the value is null in the code. I used System.out.println() to print the name and value before I put it in a session. This must be something else. Bill Larry Isaacs [EMAIL PROTECTED] on 12/04/2001 03:02:24 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] cc: Subject: RE: Need help on Session's null pointer exception The Servlet 2.2 spec states that neither the name or object may be null. This is the spec that Tomcat 3.3 is the reference implementation for. The Servlet 2.3 spec allows the object to be null, which is the equivalent of calling removeAttribute(). This is why the code works in Tomcat 4.0.1. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 2:51 PM To: [EMAIL PROTECTED] Subject: Re: Need help on Session's null pointer exception Thank you for your reply, Denis. I am sure the value I try to put in a session is not null. We used Websphere and Tomcat 4.0.1 as our testing environment and the codes are running OK. Only when we tried to use Tomcat3.3 giving us this error message. We suspect either our setting in wrong or there is a bug in Tomcat3.3. Bill Denis Balazuc [EMAIL PROTECTED] on 12/04/2001 02:38:37 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] cc: Subject: Re: Need help on Session's null pointer exception Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Need help on Session's null pointer exception
In Jdk 1.3.1, line 380 is where java.util.Hashtable.put() throws an NPE after testing the value for null. In ServerSession.setAttribute(), other than logging, there is only attributes.put(name, value);. At this point, I think it is more likely there is a bug in your println()s and the value is actually null. Hope this helps. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 3:24 PM To: Tomcat Users List Subject: RE: Need help on Session's null pointer exception I am sure neither the name nor the value is null in the code. I used System.out.println() to print the name and value before I put it in a session. This must be something else. Bill Larry Isaacs [EMAIL PROTECTED] on 12/04/2001 03:02:24 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] cc: Subject: RE: Need help on Session's null pointer exception The Servlet 2.2 spec states that neither the name or object may be null. This is the spec that Tomcat 3.3 is the reference implementation for. The Servlet 2.3 spec allows the object to be null, which is the equivalent of calling removeAttribute(). This is why the code works in Tomcat 4.0.1. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 2:51 PM To: [EMAIL PROTECTED] Subject: Re: Need help on Session's null pointer exception Thank you for your reply, Denis. I am sure the value I try to put in a session is not null. We used Websphere and Tomcat 4.0.1 as our testing environment and the codes are running OK. Only when we tried to use Tomcat3.3 giving us this error message. We suspect either our setting in wrong or there is a bug in Tomcat3.3. Bill Denis Balazuc [EMAIL PROTECTED] on 12/04/2001 02:38:37 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] cc: Subject: Re: Need help on Session's null pointer exception Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Need help on Session's null pointer exception
Thank you Larry, your comments are very helpful. I will check my prinln() to see if there is anything missing. Bill Larry Isaacs [EMAIL PROTECTED] on 12/04/2001 03:41:49 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] cc: Subject: RE: Need help on Session's null pointer exception In Jdk 1.3.1, line 380 is where java.util.Hashtable.put() throws an NPE after testing the value for null. In ServerSession.setAttribute(), other than logging, there is only attributes.put(name, value);. At this point, I think it is more likely there is a bug in your println()s and the value is actually null. Hope this helps. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 3:24 PM To: Tomcat Users List Subject: RE: Need help on Session's null pointer exception I am sure neither the name nor the value is null in the code. I used System.out.println() to print the name and value before I put it in a session. This must be something else. Bill Larry Isaacs [EMAIL PROTECTED] on 12/04/2001 03:02:24 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] cc: Subject: RE: Need help on Session's null pointer exception The Servlet 2.2 spec states that neither the name or object may be null. This is the spec that Tomcat 3.3 is the reference implementation for. The Servlet 2.3 spec allows the object to be null, which is the equivalent of calling removeAttribute(). This is why the code works in Tomcat 4.0.1. Cheers, Larry -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, December 04, 2001 2:51 PM To: [EMAIL PROTECTED] Subject: Re: Need help on Session's null pointer exception Thank you for your reply, Denis. I am sure the value I try to put in a session is not null. We used Websphere and Tomcat 4.0.1 as our testing environment and the codes are running OK. Only when we tried to use Tomcat3.3 giving us this error message. We suspect either our setting in wrong or there is a bug in Tomcat3.3. Bill Denis Balazuc [EMAIL PROTECTED] on 12/04/2001 02:38:37 PM Please respond to Tomcat Users List [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] cc: Subject: Re: Need help on Session's null pointer exception Hi You are simply trying to set a null value in a session, which is forbidden.something like session.setAttribute(HelloWorld, null); I'm not sure this behaviour is specified in JSP specs though it's more because a Hashtable is used as the Map to store key=value session attributes within Tomcat. I run a servlet on Tomcat3.3 and got the following error: java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:380) at org.apache.tomcat.core.ServerSession.setAttribute(Unknown = Source) Can anyone kindly tell me what is wrong with my setting? I changed the expiration time for session in server.xml and I am sure the SessionIdGenerator is set too. Bill -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
AW: Need help on Session's null pointer exception
Have a look at com.fub.its.servlet.SecuredServlet Line 162 That's where the NullPointer comes from. -Ursprüngliche Nachricht- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Gesendet: Dienstag, 4. Dezember 2001 22:43 An: Tomcat Users List Betreff: RE: Need help on Session's null pointer exception -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
