Hi,
This question was probbably posted many times but I didn't found answer
and I really need it.
I'm using TC 4.1
DB : Hypersonic
HSQLDB.jar in \tomcat_home\common\lib
Server.xml
----------
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/TestDB"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</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>100</value>
</parameter>
<!-- Maximum number of idle dB connections to retain in pool.
Set to 0 for no limit.
-->
<parameter>
<name>maxIdle</name>
<value>30</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>
<!-- username and password for dB connections -->
<parameter>
<name>username</name>
<value>iuser</value>
</parameter>
<parameter>
<name>password</name>
<value>iuser</value>
</parameter>
<!-- Class name for JDBC driver -->
<parameter>
<name>driverClassName</name>
<value>org.hsqldb.jdbcDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:hsqldb:hsql://asterix</value>
</parameter>
</ResourceParams>
</Context>
WEB.XML
--------
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
Servlet code
-------------
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource)envCtx.lookup("jdbc/TestDB");
if (ds != null) {
Connection conn = ds.getConnection();
//"value" of DS is "org.apache.commons.dbcp.BasicDataSource@b6548"
//and here is exception in "Connection conn = ds.getConnection();"
java.sql.SQLException: Cannot load JDBC driver class 'null'
at
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSou
rce.java:529)
at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource
.java:312)
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