Tomcat7.0配置C3P0连接池时，出现NoInitalContextException

Tomcat7.0配置C3P0连接池时，出现NoInitalContextException

Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial

at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)

at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)

at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)

at javax.naming.InitialContext.lookup(InitialContext.java:392)

at TestTomcat.main(TestTomcat.java:34)

type Exception report

message javax.servlet.ServletException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: javax.servlet.ServletException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)

javax.servlet.cause

javax.servlet.ServletException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)

org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)

org.apache.jsp.index_jsp._jspService(index_jsp.java:120)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

javax.servlet.cause

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

org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452)

org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)

org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)

org.apache.jsp.index_jsp._jspService(index_jsp.java:80)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

javax.servlet.cause

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(BasicDataSource.java:1437)

org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)

org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)

org.apache.jsp.index_jsp._jspService(index_jsp.java:80)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

javax.servlet.The full stack trace of the root cause is available in the Apache Tomcat/7.0.33 logs.

解决方案是：

You can do this by creating a src/main/webapp/META-INF/context.xml (I'm assuming you're using the standard maven directory structure - if not, then the META-INF folder should be a sibling of your WEB-INF directory). The contents of the META-INF/context.xml file would look something like:

xml version="1.0" encoding="UTF-8"?>Context>

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