Cannot create jdbc driver of class for connect url null tomcat

 · The Tomcat log file contains the following error. SEVERE: Unable to process external action(s). www.doorway.rutedException: Cannot create JDBC driver of class '' for connect URL 'null', cause: www.doorway.rueption: No suitable driver. Unable to create class 'JDBC driver' to connect 'null' url: I don't understand this exception Why does it say a null URL and give an empty class '' in the exception when I specify the database URL? I am trying to connect to the derby database through a servlet when using Tomcat. Cannot create JDBC driver of class '' for connect URL 'null' This implies to me that Tomcat is recognizing my declaration in my conf/www.doorway.ru but is not loading the associated. I get this problem with Tomcat and on Red Hat 9 with Sun JDK My www.doorway.ru contains.

www.doorway.rutedException: Cannot create PoolableConnectionFactory (The TCP/IP connection to the host CARTOSQL, port has failed. Error: Connection refused: connect. Please verify the connection properties and check that a SQL Server instance is running on the host and accepting TCP/IP connections at the port, and that. The Tomcat log file contains the following error. SEVERE: Unable to process external action(s). www.doorway.rutedException: Cannot create JDBC driver of class '' for connect URL 'null', cause: www.doorway.rueption: No suitable driver. Cannot create JDBC driver of class '' for connect URL 'jdbc:mysql://localhost/test' at www.doorway.ruConnectionFactory(www.doorway.ru) at www.doorway.ruDataSource(www.doorway.ru).

Received Cannot Create JDBC Driver of Class for Connect URL null getConnection(www.doorway.ru) ~[www.doorway.ru]. I am getting "Cannot create JDBC driver of class '' for connect URL 'null' " error when I start the tomcat server with Liferay I got this message when trying to initiate a jdbc connection from a portlet to an Oracle10G database. I am using liferayportaltomcat for jdk tomcat.