Einrichten der JNDI-Datasource mit oracle, Tomcat

Kann ich nicht machen, es Arbeit, die Verbindung von DataSource erhalten Sie von JNDI in tomcat 7.0, wodurch Fehler wie dieser:

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of cla
ss '' for connect URL 'null'

Habe ich getan, in vielerlei Hinsicht nach dem doc und anderen Leuten Vorschläge, aber noch nicht in der Lage, es zu beheben. Hier sind meine Einstellungen:

In web.xml:

<resource-ref>
    <description>MyDataSource</description>
    <res-ref-name>jdbc/MyDataSource</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref> 

In context.xml:

<Context>
  <Resource name="jdbc/MyDataSource" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="abc" password="abc" driverClassName="oracle.jdbc.OracleDriver"
               url="jdbc:oracle:thin:@123.123.123.123:1521:xe"/>
               <!-- //tried both driver class names but all not work driverClassName="oracle.jdbc.driver.OracleDriver" -->
</Context>

Auch, ich versuchte zu setzen, dass in server.xml auch nicht Arbeit

<Resource name="jdbc/MyDataSource" auth="Container" type="javax.sql.DataSource"
    driverClassName="oracle.jdbc.driver.OracleDriver"
    url="jdbc:oracle:thin:@123.123.123.123:1521:xe"
    servicename="MyDataSource"  username="abc" password="abc"
    maxActive="20" maxIdle="10" maxWait="20000"/>

<ResourceParams name="jdbc/MyDataSource">
    <parameter>
        <name>user</name>
        <value>abc</value>
    </parameter>
    <parameter>
        <name>password</name>
        <value>abc</value>
    </parameter>
    <parameter>
        <name>driverClassName</name>
        <value>oracle.jdbc.driver.OracleDriver</value>
    </parameter>
</ResourceParams>

Setzen classes12.jar sowie ojdbc14.jar in Tomcat 7.0\lib

Kann jemand Punkt mich der richtige Weg?

Ich Verschwendete so viel Zeit, die Konfiguration ist aber immer noch nicht damit es funktioniert. Vielen Dank im Voraus!

John

---

Stack-Trace als unten:

DS: org.apache.tomcat.dbcp.dbcp.BasicDataSource@497062
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at DBTest.doGet(DBTest.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(Unknown Source)
    at java.sql.DriverManager.getDriver(Unknown Source)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1437)
    ... 21 more

Und hier ist der code, Ausnahme bei ds.getConnection. (Es ist nicht die typische Art und Weise zu bekommen, DS, bcoz müssen übereinstimmen, WebSphere Weg...)

Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.naming.java.javaURLContextFactory");
initCtx = new InitialContext(env);
DataSource ds = (DataSource) initCtx.lookup("java:comp/env/jdbc/MyDataSource");
System.err.println("DS: " + ds.toString());
Connection conn = ds.getConnection();