Apache jasper exceptions

[gqian]

Hello,
I have deployed a java servlet page application in tomcat, using virtual host mapping by
adding virtual host directory in server.xml. like below:
=======================================================================
<Host name="appl.xyz.com" debug="1" appBase="/home/sites/mobi" unpackWARs="true">

<Context path="" docBase="/home/sites/mobi" debug="1">

<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>

<Resource name="jdbc/lat1"
auth="Container"
type="javax.sql.DataSource"/>

<ResourceParams name="jdbc/lat1">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourc#*$!</value>
</parameter>

<parameter>
<name>removeAbandoned</name>
<value>true</value>
</parameter>
<parameter>
<name>removeAbandonedTimeout</name>
<value>60</value>
</parameter>

<parameter>
<name>logAbandoned</name>
<value>true</value>
</parameter>

<!-- Maximum number of dB connections in pool. Make sure you
configure your mysqld max_connections large enough to handle
all of your db connections. Set to 0 for no limit.
-->
<parameter>
<name>maxActive</name>
<value>3000</value>
</parameter>

<!-- Maximum number of idle dB connections to retain in pool.
Set to 0 for no limit.
-->
<parameter>
<name>maxIdle</name>
<value>3000</value>
</parameter>

<!-- Maximum time to wait for a dB connection to become available
in ms, in this example 10 seconds. An Exception is thrown if
this timeout is exceeded. Set to -1 to wait indefinitely.
-->
<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>

<!-- MySQL dB username and password for dB connections -->
<parameter>
<name>username</name>
<value>mysqluser</value>
</parameter>
<parameter>
<name>password</name>
<value>mysqlpassword</value>
</parameter>

<!-- Class name for mm.mysql JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>

<!-- The JDBC connection url for connecting to your MySQL dB.
The autoReconnect=true argument to the url makes sure that the
mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
connection. mysqld by default closes idle connections after 8 hours.
-->
<parameter>
<name>url</name>
<value>

jdbc:mysql://localhost:3306/TestDB?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=latin1
</value>
</parameter>
</ResourceParams>
</Context>

</Host>
=======================================================================

I am using software:
Linux: Redhat enterprise 8.0
Java(j2sdk1.4_0_01-linux-i586.bin)
Tomcat(5.0.30.tar.gz)
Tomcat-connector-jk2-2.0.2-src.tar.gz
Mysql(mysql-5.0.18.tar.gz)
mysql-connector-java-3.1.11-bin.jar
But when I start tomcat, i always got exceptions in the browser and the logs:
=======================================================================
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling
this request.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:691)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:658)
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:806)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.index_jsp._jspService(index_jsp.java:388)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
java.util.Hashtable.get(Hashtable.java:333)
Trans.ResourceTable.getLocale(ResourceTable.java:5)
Trans.Lang2CharsetMap.<init>(Lang2CharsetMap.java:32)
org.apache.jsp.sebase.common_005ferror_jsp._jspService(common_005ferror_jsp.java:1100)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:691)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:658)
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:806)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.index_jsp._jspService(index_jsp.java:388)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

=======================================================================
I have been working on this issue for weeks. But still can not solve the problem.Could
anyone tell me what could be the reason, or what should i go for check?

Thanks.

Qiang