Hi,
I'm having some problems initialising a DataSource object for the purposes of
connection pooling under tomcat.
The database to which I'm trying to connect is Postgresql. The connections
work fine with the standard java.sql.* approach.
Basically when I try to acquire a DataSource object, I get null. Nothing in
my log files indicates the cause of the problem - or indeed that there is a
problem at all (aside from my own log4j output).
When using the standard java.sql stuff my jsp & servlets work perfectly in
every respect, so I'm confident that the rest of my configuration is correct.
Or correct enough, anyway.
Versions:
tomcat: 4.0.3
jdk: 1.3.1
j2sdkee: 1.3
postgresql: 7.1.3
log4j: 1.2beta4
Code that bombs out:
/** TODO: Remove this code completely once the connection
pool is in place...
Class.forName("org.postgresql.Driver").newInstance();
m_connection =
DriverManager.getConnection("jdbc:postgresql://localhost/council","council","
council"); **/
Context c1 = new InitialContext();
log.debug("C1: " + c1);
Object c2 = ((Context)c1).lookup("java:/comp/env");
log.debug("C2: " + c2);
Object c3 = ((Context)c2).lookup("jdbc");
log.debug("C3: " + c3);
Object c4 = ((Context)c3).lookup("ForumsDB");
log.debug("C4: " + c4);
m_connection = ((DataSource)c4).getConnection();
And the log4j output of the above is:
C1: javax.naming.InitialContext@658cb8
C2: org.apache.naming.NamingContext@79935d
C3: org.apache.naming.NamingContext@39e45a
C4: null
Followed, naturally, by a NullPointerException.
So I seem to be setting up a suitable java:/comp/env/jdbc path, but either
I've not set up the ForumsDB sub-path correctly (seems unlikely, since it's
formed by the same directive as the parent), OR something is storing a null
object in this leaf, OR nothing is getting invoked to store anything in this
leaf.
Now, those last two possibilities seem the most likely culprits, but I would
have expected either one to result in a logged failure and I can find nothing
appropriate. I've looked in /var/log/* and tomcat/logs/*
Any suggestions ? I'm quitely going spare...
Thanks,
Dave
Config files follow:
server.xml:
<!-- Example Server Configuration File -->
<!-- Note that component elements are nested corresponding to their
parent-child relationships with each other -->
<!-- A "Server" is a singleton element that represents the entire JVM,
which may contain one or more "Service" instances. The Server
listens for a shutdown command on the indicated port.
Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" or "Loggers" at this level.
-->
<Server port="8005" shutdown="SHUTDOWN" debug="0">
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" (and therefore the web applications visible
within that Container). Normally, that Container is an "Engine",
but this is not required.
Note: A "Service" is not itself a "Container", so you may not
define subcomponents such as "Valves" or "Loggers" at this level.
-->
<!-- Define the Tomcat Stand-Alone Service -->
<Service name="Tomcat-Standalone">
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Each Connector passes requests on to
the associated "Container" (normally an Engine) for processing.
By default, a non-SSL HTTP/1.1 Connector is established on port
8080. You can also enable an SSL HTTP/1.1 Connector on port 8443 by
following the instructions below and uncommenting the second Connector
entry. SSL support requires the following steps (see the SSL Config
HOWTO in the Tomcat 4.0 documentation bundle for more detailed
instructions):
* Download and install JSSE 1.0.2 or later, and put the JAR files
into "$JAVA_HOME/jre/lib/ext".
* Execute:
%JAVA_HOME%\bin\keytool -genkey -alias tomcat -keyalg RSA
(Windows)
$JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA (Unix)
with a password value of "changeit" for both the certificate and
the keystore itself.
By default, DNS lookups are enabled when a web application calls
request.getRemoteHost(). This can have an adverse impact on
performance, so you can disable it by setting the
"enableLookups" attribute to "false". When DNS lookups are
disabled, request.getRemoteHost() will return the String version of the IP
address of the remote client.
-->
<!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="60000"/>
<!-- Note : To disable connection timeouts, set connectionTimeout value
to -1 -->
<!-- Define an SSL HTTP/1.1 Connector on port 8443 -->
<!--
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8443" minProcessors="5" maxProcessors="75"
enableLookups="true"
acceptCount="10" debug="0" scheme="https" secure="true">
<Factory className="org.apache.catalina.net.SSLServerSocketFactory"
clientAuth="false" protocol="TLS"/>
</Connector>
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector className="org.apache.ajp.tomcat4.Ajp13Connector"
port="8009" minProcessors="5" maxProcessors="75"
acceptCount="10" debug="0"/>
<!-- Define a Proxied HTTP/1.1 Connector on port 8081 -->
<!-- See proxy documentation for more information about using this. -->
<!--
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8081" minProcessors="5" maxProcessors="75"
enableLookups="true"
acceptCount="10" debug="0" connectionTimeout="60000"
proxyPort="80"/>
-->
<!-- Define a non-SSL HTTP/1.0 Test Connector on port 8082 -->
<!--
<Connector className="org.apache.catalina.connector.http10.HttpConnector"
port="8082" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0"/>
-->
<!-- An Engine represents the entry point (within Catalina) that
processes every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them on to
the appropriate Host (virtual host). -->
<!-- Define the top level container in our container hierarchy -->
<Engine name="Standalone" defaultHost="localhost" debug="0">
<!-- The request dumper valve dumps useful debugging information about
the request headers and cookies that were received, and the
response
headers and cookies that were sent, for all requests received by
this instance of Tomcat. If you care only about requests to a
particular virtual host, or a particular application, nest this
element inside the corresponding <Host> or <Context> entry
instead.
For a similar mechanism that is portable to all Servlet 2.3
containers, check out the "RequestDumperFilter" Filter in the
example application (the source for this filter may be found in
"$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").
Request dumping is disabled by default. Uncomment the following
element to enable it. -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- Global logger unless overridden at lower levels -->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>
<!-- Because this Realm is here, an instance will be shared globally
-->
<!-- <Realm className="org.apache.catalina.realm.MemoryRealm" /> -->
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="org.postgresql.Driver"
connectionURL="jdbc:postgresql://localhost/council?user=council;password=coun
cil" userTable="users"
userNameCol="username"
userCredCol="password"
userRoleTable="roles"
roleNameCol="rolename"
digest="MD5" />
<!-- Replace the above Realm with one of the following to get a Realm
stored in a database and accessed via JDBC -->
<!--
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="org.gjt.mm.mysql.Driver"
connectionURL="jdbc:mysql://localhost/authority?user=test;password=test"
userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!--
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="oracle.jdbc.driver.OracleDriver"
connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL?user=scott;password=tiger
" userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!--
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="sun.jdbc.odbc.JdbcOdbcDriver"
connectionURL="jdbc:odbc:CATALINA"
userTable="users" userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!-- Define the default virtual host -->
<Host name="localhost" debug="0" appBase="webapps" unpackWARs="true">
<!-- Normally, users must authenticate themselves to each web app
individually. Uncomment the following entry if you would like
a user to be authenticated the first time they encounter a
resource protected by a security constraint, and then have that
user identity maintained across *all* web applications contained
in this virtual host. -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn"
debug="0"/>
-->
<!-- Access log processes all requests for this virtual host. By
default, log files are created in the "logs" directory relative
to
$CATALINA_HOME. If you wish, you can specify a different
directory with the "directory" attribute. Specify either a
relative
(to $CATALINA_HOME) or absolute path to the desired directory.
-->
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs" prefix="localhost_access_log."
suffix=".txt"
pattern="common"/>
<!-- Logger shared by all Contexts related to this virtual host. By
default (when using FileLogger), log files are created in the
"logs"
directory relative to $CATALINA_HOME. If you wish, you can
specify
a different directory with the "directory" attribute. Specify
either a
relative (to $CATALINA_HOME) or absolute path to the desired
directory.-->
<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="localhost_log." suffix=".txt"
timestamp="true"/>
<!-- Define properties for each web application. This is only needed
if you want to set non-default properties, or have web
application
document roots in places other than the virtual host's appBase
directory. -->
<!-- Tomcat Root Context -->
<!--
<Context path="" docBase="ROOT" debug="0"/>
-->
<!-- Paperstack Context -->
<Context path="/paperstack" docBase="/home/dave/paperstack/site" debug="9">
<Resource name="jdbc/ForumsDB"
auth="Container"
type="javax.sql.DataSource" />
<ResourceParams name="jdbc/ForumsDB">
<parameter>
<name>driverClassName</name>
<value>org.postgresql.Driver</value>
</parameter>
<parameter>
<name>driverName</name>
<value>jdbc:postgresql://localhost/council</value>
</parameter>
<parameter>
<name>user</name>
<value>council</value>
</parameter>
<parameter>
<name>password</name>
<value>council</value>
</parameter>
<parameter>
<name>maxPoolSize</name>
<value>2</value>
</parameter>
<parameter>
<name>loginTimeout</name>
<value>10</value>
</parameter>
</ResourceParams>
</Context>
<!-- Tomcat Manager Context -->
<Context path="/manager" docBase="manager"
debug="0" privileged="true"/>
</Host>
</Engine>
</Service>
<!-- The MOD_WEBAPP connector is used to connect Apache 1.3 with Tomcat 4.0
as its servlet container. Please read the README.txt file coming with
the WebApp Module distribution on how to build it.
(Or check out the "jakarta-tomcat-connectors/webapp" CVS repository)
To configure the Apache side, you must ensure that you have the
"ServerName" and "Port" directives defined in "httpd.conf". Then,
lines like these to the bottom of your "httpd.conf" file:
LoadModule webapp_module libexec/mod_webapp.so
WebAppConnection warpConnection warp localhost:8008
WebAppDeploy examples warpConnection /examples/
The next time you restart Apache (after restarting Tomcat, if needed)
the connection will be established, and all applications you make
visible via "WebAppDeploy" directives can be accessed through Apache.
-->
<!-- Define an Apache-Connector Service -->
<Service name="Tomcat-Apache">
<Connector className="org.apache.catalina.connector.warp.WarpConnector"
port="8008" minProcessors="5" maxProcessors="75"
enableLookups="true" appBase="webapps"
acceptCount="10" debug="0"/>
<!-- Replace "localhost" with what your Apache "ServerName" is set to -->
<Engine className="org.apache.catalina.connector.warp.WarpEngine"
name="Apache" debug="0">
<!-- Global logger unless overridden at lower levels -->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="apache_log." suffix=".txt"
timestamp="true"/>
<!-- Because this Realm is here, an instance will be shared globally
--> <Realm className="org.apache.catalina.realm.MemoryRealm" />
</Engine>
</Service>
</Server>
web.xml:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd";>
<web-app>
<taglib>
<taglib-uri>
/pstags
</taglib-uri>
<taglib-location>
/WEB-INF/tlds/paperstack.tld
</taglib-location>
</taglib>
<resource-ref>
<res-ref-name>jdbc/ForumsDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<security-constraint>
<web-resource-collection>
<web-resource-name>Protected Resources</web-resource-name>
<url-pattern>/protected/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>administrator</role-name>
</auth-constraint>
</security-constraint>
<login-config>
<auth-method>FORM</auth-method>
<realm-name>Protected Resources</realm-name>
<form-login-config>
<form-login-page>/login.jsp</form-login-page>
<form-error-page>/loginError.jsp</form-error-page>
</form-login-config>
</login-config>
</web-app>
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