Re: Problem with JSP to access XML files

Jean-Francois Arcand Wed, 05 Nov 2003 13:37:14 -0800

Check your xerces version. Are they the same? Still make sure you don't pass a null....

-- Jeanfrancois

Nicolas Fabry wrote:

What is strange is that exactly the same program is running on another PC
(but with Windows XP -- I don't think the problem is that one).
Thus, Is it really the java code the problem?
----- Original Message -----
From: "Shapira, Yoav" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <[EMAIL PROTECTED]>
Sent: Wednesday, November 05, 2003 3:18 PM
Subject: RE: Problem with JSP to access XML files
Howdy,
You're call setErrorHandler with a null argument (exh) is null.  That's
why the error happens.  Make sure you have an actual error handler
that's not null before you call that method.
Yoav Shapira
Millennium ChemInformatics
-----Original Message-----
From: Nicolas Fabry [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 05, 2003 3:14 PM
To: Tomcat Users List
Subject: Re: Problem with JSP to access XML files
(xpert is a package for all my classes)
I put in attachements the differents files who are responsibles of this
error.
The error appears in the method LoadXML in the DocXML.java file
the line wich is the cause of this problem is :
myReader.setErrorHandler(exh);
Thank you very much for your help
----- Original Message -----
From: "Shapira, Yoav" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <[EMAIL PROTECTED]>
Sent: Wednesday, November 05, 2003 2:50 PM
Subject: RE: Problem with JSP to access XML files
Howdy,
Post the relevant part of Users.java and DocXML.java.
Yoav Shapira
Millennium ChemInformatics
-----Original Message-----
From: Nicolas Fabry [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 05, 2003 2:34 PM
To: Tomcat Users List
Subject: Problem with JSP to access XML files
Hello, I have a problem since one week. I have to upgrade an existing system working with JSP and XML files. There is a login page written in .jsp and the login/password are
written in

a XML file. Any time I try tu access the system (by loggin), a compilation error appear. I'm using TOMCAT 4.1.29 and J2SDK 1.4.1_05. It's a little bit long, but you can have a look just to the firsts

lines of

the ROOT CAUSE (and the exception)

HTTP Status 500 -
-----------------------------------------------------------------------
----
-
----
type Exception report

message

description The server encountered an internal error () that
prevented

it
from fulfilling this request.

exception

org.apache.jasper.JasperException at

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.j

ava:

2 54) at

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295

)

at

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at

org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applic

atio

n FilterChain.java:247) at

org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFil

terC

h ain.java:193) at

org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVal

ve.j

a va:256) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardContextValve.invoke(StandardContextVal

ve.j

a va:191) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticato

rBas

e .java:494) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardContext.invoke(StandardContext.java:24

17)

at

org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.jav

a:18

0 ) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherV

alve

. java:171) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.jav

a:17

2 ) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve

.jav

a :174) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
at

org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:7

81)

at

org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

Conn

e ction(Http11Protocol.java:549) at

org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:5

89)

at

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPoo
l.ja
v
a:666)
at java.lang.Thread.run(Thread.java:536)
root cause

java.lang.NullPointerException at
org.apache.xerces.parsers.AbstractSAXParser.setErrorHandler(Unknown

Source) at xpert.DocXML.loadXML(DocXML.java:80) at xpert.Users.checkLogin(Users.java:39) at org.apache.jsp.measurer_jsp._jspService(measurer_jsp.java:57) at

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.j

ava:

2 10) at

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295

)

at

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at

org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applic

atio

n FilterChain.java:247) at

org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFil

terC

h ain.java:193) at

org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVal

ve.j

a va:256) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardContextValve.invoke(StandardContextVal

ve.j

a va:191) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authenticato

rBas

e .java:494) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardContext.invoke(StandardContext.java:24

17)

at

org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.jav

a:18

0 ) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherV

alve

. java:171) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.jav

a:17

2 ) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:641) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve

.jav

a :174) at

org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.

invo

k eNext(StandardPipeline.java:643) at

org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:

480)

at

org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at

org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)
at

org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:7

81)

at

org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process

Conn

e ction(Http11Protocol.java:549) at

org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:5

89)

at

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPoo
l.ja
v
a:666)
at java.lang.Thread.run(Thread.java:536)
-----------------------------------------------------------------------
----
-
----
Apache Tomcat/4.1.29

It's maybe cause of the reference of the XML file. Have I to put c:\path_to_wath_I_want or file://c:/path_to_wath_I_want? Have I to
use
relatives links or not?
The XML file is like this :
<?xml version="1.0" encoding="UTF-8" ?>
- 
- <users xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="./Xsd/users.xsd">
<user login="nicolas" pswd="nicolas" status="admin" />
</users>
Really thanks to help me resolve this problem

Nicolas Fabry
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Re: Problem with JSP to access XML files

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