xml - cannot create jdbc driver of class '' for connect url 'null' postgresql -

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i'm getting error when try deploy war application.

org.apache.tomcat.dbcp.dbcp.sqlnestedexception: cannot create jdbc driver of cla ss '' connect url 'null'         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createconnectionfactory(b asicdatasource.java:1452)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createdatasource(basicdat asource.java:1371)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.getconnection(basicdataso urce.java:1044)         @ kimet.conexionsql.getconexion(conexionsql.java:20)         @ kimet.global.cargarhashtablesaux(global.java:2360)         @ kimet.inicio.init(inicio.java:33)         @ org.apache.catalina.core.standardwrapper.loadservlet(standardwrapper. java:1206)         @ org.apache.catalina.core.standardwrapper.load(standardwrapper.java:10 26)         @ org.apache.catalina.core.standardcontext.loadonstartup(standardcontex t.java:4421)         @ org.apache.catalina.core.standardcontext.start(standardcontext.java:4 734)         @ org.apache.catalina.core.containerbase.addchildinternal(containerbase .java:799)         @ org.apache.catalina.core.containerbase.addchild(containerbase.java:77 9)         @ org.apache.catalina.core.standardhost.addchild(standardhost.java:601)          @ org.apache.catalina.startup.hostconfig.deploywar(hostconfig.java:943)          @ org.apache.catalina.startup.hostconfig.deploywars(hostconfig.java:778 )         @ org.apache.catalina.startup.hostconfig.deployapps(hostconfig.java:504 )         @ org.apache.catalina.startup.hostconfig.start(hostconfig.java:1317)         @ org.apache.catalina.startup.hostconfig.lifecycleevent(hostconfig.java :324)         @ org.apache.catalina.util.lifecyclesupport.firelifecycleevent(lifecycl esupport.java:142)         @ org.apache.catalina.core.containerbase.start(containerbase.java:1065)          @ org.apache.catalina.core.standardhost.start(standardhost.java:840)         @ org.apache.catalina.core.containerbase.start(containerbase.java:1057)          @ org.apache.catalina.core.standardengine.start(standardengine.java:463 )         @ org.apache.catalina.core.standardservice.start(standardservice.java:5 25)         @ org.apache.catalina.core.standardserver.start(standardserver.java:754 )         @ org.apache.catalina.startup.catalina.start(catalina.java:595)         @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)         @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl. java:39)         @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodacces sorimpl.java:25)         @ java.lang.reflect.method.invoke(method.java:597)         @ org.apache.catalina.startup.bootstrap.start(bootstrap.java:289)         @ org.apache.catalina.startup.bootstrap.main(bootstrap.java:414) caused by: java.lang.nullpointerexception         @ sun.jdbc.odbc.jdbcodbcdriver.getprotocol(jdbcodbcdriver.java:507)         @ sun.jdbc.odbc.jdbcodbcdriver.knownurl(jdbcodbcdriver.java:476)         @ sun.jdbc.odbc.jdbcodbcdriver.acceptsurl(jdbcodbcdriver.java:307)         @ java.sql.drivermanager.getdriver(drivermanager.java:253)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createconnectionfactory(b asicdatasource.java:1437)         ... 31 more org.apache.tomcat.dbcp.dbcp.sqlnestedexception: cannot create jdbc driver of cla ss '' connect url 'null'         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createconnectionfactory(b asicdatasource.java:1452)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createdatasource(basicdat asource.java:1371)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.getconnection(basicdataso urce.java:1044)         @ kimet.conexionsql.getconexion(conexionsql.java:20)         @ kimet.global.cargarhashtablesaux(global.java:2360)         @ kimet.inicio.init(inicio.java:33)         @ org.apache.catalina.core.standardwrapper.loadservlet(standardwrapper. java:1206)         @ org.apache.catalina.core.standardwrapper.load(standardwrapper.java:10 26)         @ org.apache.catalina.core.standardcontext.loadonstartup(standardcontex t.java:4421)         @ org.apache.catalina.core.standardcontext.start(standardcontext.java:4 734)         @ org.apache.catalina.core.containerbase.addchildinternal(containerbase .java:799)         @ org.apache.catalina.core.containerbase.addchild(containerbase.java:77 9)         @ org.apache.catalina.core.standardhost.addchild(standardhost.java:601)          @ org.apache.catalina.startup.hostconfig.deploywar(hostconfig.java:943)          @ org.apache.catalina.startup.hostconfig.deploywars(hostconfig.java:778 )         @ org.apache.catalina.startup.hostconfig.deployapps(hostconfig.java:504 )         @ org.apache.catalina.startup.hostconfig.start(hostconfig.java:1317)         @ org.apache.catalina.startup.hostconfig.lifecycleevent(hostconfig.java :324)         @ org.apache.catalina.util.lifecyclesupport.firelifecycleevent(lifecycl esupport.java:142)         @ org.apache.catalina.core.containerbase.start(containerbase.java:1065)          @ org.apache.catalina.core.standardhost.start(standardhost.java:840)         @ org.apache.catalina.core.containerbase.start(containerbase.java:1057)          @ org.apache.catalina.core.standardengine.start(standardengine.java:463 )         @ org.apache.catalina.core.standardservice.start(standardservice.java:5 25)         @ org.apache.catalina.core.standardserver.start(standardserver.java:754 )         @ org.apache.catalina.startup.catalina.start(catalina.java:595)         @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)         @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl. java:39)         @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodacces sorimpl.java:25)         @ java.lang.reflect.method.invoke(method.java:597)         @ org.apache.catalina.startup.bootstrap.start(bootstrap.java:289)         @ org.apache.catalina.startup.bootstrap.main(bootstrap.java:414) caused by: java.lang.nullpointerexception         @ sun.jdbc.odbc.jdbcodbcdriver.getprotocol(jdbcodbcdriver.java:507)         @ sun.jdbc.odbc.jdbcodbcdriver.knownurl(jdbcodbcdriver.java:476)         @ sun.jdbc.odbc.jdbcodbcdriver.acceptsurl(jdbcodbcdriver.java:307)         @ java.sql.drivermanager.getdriver(drivermanager.java:253)         @ org.apache.tomcat.dbcp.dbcp.basicdatasource.createconnectionfactory(b asicdatasource.java:1437)         ... 31 more --- inicializado kimetsport  --- thu apr 25 11:16:13 cest 2013 25-abr-2013 11:16:13 org.apache.catalina.startup.hostconfig deploydirectory info: despliegue del directorio docs de la aplicaci¾n web 25-abr-2013 11:16:13 org.apache.catalina.startup.hostconfig deploydirectory info: despliegue del directorio examples de la aplicaci¾n web 25-abr-2013 11:16:14 org.apache.catalina.startup.hostconfig deploydirectory info: despliegue del directorio root de la aplicaci¾n web 25-abr-2013 11:16:14 org.apache.coyote.http11.http11aprprotocol start info: arrancando coyote http/1.1 en puerto http-8080 25-abr-2013 11:16:14 org.apache.coyote.ajp.ajpaprprotocol start info: arrancando coyote ajp/1.3 en ajp-8009 25-abr-2013 11:16:14 org.apache.catalina.startup.catalina start info: server startup in 4540 ms

i show files i've modified:

at beginning, in tomcat's context.xml file:

<context reloadable="true" privileged="true">     <!-- default set of monitored resources -->     <watchedresource>web-inf/web.xml</watchedresource> </context>

in web.xml file:

<resource-ref>     <!-- <description>db kimet</description> -->     <res-ref-name>modulo/kimet</res-ref-name>     <res-type>javax.sql.datasource</res-type>     <res-auth>container</res-auth>     <!-- <res-sharing-scope>shareable</res-sharing-scope> --> </resource-ref>

finally, i've created own xml file "aks.xml" in directory "conf\catalina\localhost"

<?xml version='1.0' encoding='utf-8'?>     <context crosscontext="true" displayname="kimet sport" docbase="c:/workarea/kimetsportweb/webcontent" path="/aks" reloadable="true">     <resource name="modulo/kimet"     auth="container"     type="javax.sql.datasource"     factory="org.apache.commons.dbcp.basicdatasourcefactory"     defaultautocommit="false"     removeabandoned="false"     removeabandonedtimeout="30"     maxactive="50"     maxidle="20"     maxwait="10000"     username="usukimet"     password="usukimet"     driverclassname="org.postgresql.driver"     url="jdbc:postgresql://192.168.1.169:5432/kimet_desarrollo"/>        </context>

anybody has idea why not working? suggestion welcomed! in advance!

what aks.xml file of yours?

if want specify datasource war in tomcat outside of application, have configure in context.xml, example:

  <resource name="jdbc/testdb" auth="container" type="javax.sql.datasource"                maxactive="100" maxidle="30" maxwait="10000"                username="javauser" password="javadude" driverclassname="com.mysql.jdbc.driver"                url="jdbc:mysql://localhost:3306/javatest"/>

(taken tomcat's jndi datasource how-to.)


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