Comments on: Database Connection Pooling in Tomcat using Eclipse

By: sundar

sundar — Fri, 20 Jan 2012 05:13:23 +0000

it show

rg.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class ‘com.mysql.jdbc.Driver’
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at net.viralpatel.servlet.TestServlet.doGet(TestServlet.java:43)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
… 17 more

By: balaji

balaji — Tue, 27 Dec 2011 05:38:20 +0000

Hi Mike,

Did you managed to resolve nullpointer exception now?if so can you give me solution..iam facing same error..doGet throwing null

By: Wojtek_PL

Wojtek_PL — Wed, 12 Oct 2011 07:48:38 +0000

Thanks,

I spent hours trying to make it works.
With this one – it took me minutes.

By: user

user — Mon, 04 Jul 2011 09:10:33 +0000

its very easy to understand for learners new to this topic .thank u very much.

By: Prakash

Prakash — Mon, 20 Jun 2011 05:05:19 +0000

Very good explanation of connection pooling with example..Thanks !

By: jestin

jestin — Wed, 09 Feb 2011 02:57:06 +0000

there is no instruction for index.jsp.. please let us know how to create it

By: mike

mike — Sun, 17 Oct 2010 19:28:39 +0000

I repeat your code but I don’t know what is wrong..
java.lang.NullPointerException
paquete.TestServlet.doGet(TestServlet.java:40)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.23 logs.

By: Yan

Yan — Fri, 06 Aug 2010 13:18:31 +0000

Resource name=”jdbc/orclPool”
auth=”Container”
type=”oracle.jdbc.pool.OracleDataSource”
url=”jdbc:oracle:thin:@host:1521:orcl”
factory=”oracle.jdbc.pool.OracleDataSourceFactory”
user=”user”
password=”pass”
connectionCachingEnabled=”true”
connectionCacheName=”orclConnCash”
connectionCacheProperties=”{MinLimit=0, MaxLimit=5, InitialLimit=3, connectionWaitTimeout=10}”

By: Yan

Yan — Fri, 06 Aug 2010 13:17:58 +0000

context.xml

By: Yan

Yan — Fri, 06 Aug 2010 11:59:55 +0000

to solve problem with “cannot load class”:
http://forums.sun.com/thread.jspa?threadID=5381419