我目前使用以下技术堆栈:intellj 14.1.5、Spring MVC、tomcat 8.0.28 和 mysql workbench 6.3。我正在尝试连接到我的数据库，但出现错误。我觉得问题出在我的 context.xml 文件上。如有任何帮助，我们将不胜感激。
我的 context.xml 文件是什么样的:
<!-- maxTotal: Maximum number of database connections in pool. Make sure you
configure your mysqld max_connections large enough to handle
all of your db connections. Set to -1 for no limit.
-->
<!-- maxIdle: Maximum number of idle database connections to retain in pool.
Set to -1 for no limit. See also the DBCP documentation on this
and the minEvictableIdleTimeMillis configuration parameter.
-->
<!-- maxWaitMillis: Maximum time to wait for a database connection to become available
in ms, in this example 10 seconds. An Exception is thrown if
this timeout is exceeded. Set to -1 to wait indefinitely.
-->
<!-- username and password: MySQL username and password for database connections -->
<!-- driverClassName: Class name for the old mm.mysql JDBC driver is
org.gjt.mm.mysql.Driver - we recommend using Connector/J though.
Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.
-->
<!-- url: The JDBC connection url for connecting to your MySQL database.
-->
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
maxTotal="100" maxIdle="30" maxWaitMillis="10000"
username="root" password="1234" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/module1"/>
我添加到 web.xml 的内容:
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
我的 jsp 文件是什么样的:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql"%>
<html>
<body>
<h1>Test1</h1>
<sql:query var="rs" dataSource="jdbc/TestDB">
select id from myguests
</sql:query>
<c:forEach var="row" items="${rs.rows}">
ID: ${row.id}<br/>
</c:forEach>
</body>
</html>
我的 pom.xml 文件中还有以下依赖项:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.37</version>
</dependency>
最佳答案
我能够解决我的问题。看来我需要在 webapp 目录中创建一个 META-INF 目录。完成此操作后，我将 context.xml 文件放入 META-INF 目录中，它纠正了问题。
关于mysql - 错误消息 : Unable to get connection, 数据源无效: "java.sql.SQLException: Cannot create JDBC driver of class ' ' 对于连接 URL 'null' ”，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33558943/