java.lang.ClassNotFoundException: com.mysql.jdbc.Driver 在运行时 (eclipse/maven/tomcat)
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java.lang.ClassNotFoundException: com.mysql.jdbc.Driver during Runtime (eclipse / maven /tomcat)
提问by user977505
I'm getting this error while running tomcat 'java.lang.ClassNotFoundException: com.mysql.jdbc.Driver'. I'm using a combination of Eclipse (Indigo, J2EE version) / Maven (m2e-wtp) / Tomcat 7.0. I've included this dependency in my pom file for my web application (build from scratch).
运行 tomcat 'java.lang.ClassNotFoundException: com.mysql.jdbc.Driver' 时出现此错误。我正在使用 Eclipse（Indigo，J2EE 版本）/Maven（m2e-wtp）/Tomcat 7.0 的组合。我已经在我的 web 应用程序的 pom 文件中包含了这个依赖项（从头开始构建）。
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
I do not get any compilation errors in the 'Problems' view but when I run the Tomcat server from the 'Servers' view, I get these errors. It clearly indicates that Tomcat is unable to find the Class and it is classpath configuration error and I was hoping that maven would take care of this.
我在“问题”视图中没有收到任何编译错误，但是当我从“服务器”视图运行 Tomcat 服务器时，我收到了这些错误。它清楚地表明 Tomcat 无法找到该类，这是类路径配置错误，我希望 maven 能解决这个问题。
I looked at other issues related to 'java.lang.ClassNotFoundException: com.mysql.jdbc.Driver' but weren't of much help.
我查看了与“java.lang.ClassNotFoundException: com.mysql.jdbc.Driver”相关的其他问题，但没有太大帮助。
I would greatly appreciate any help.
我将不胜感激任何帮助。
/** This is how I load the Driver */
/** 这是我加载驱动程序的方式 */
static {
DriverAdapterCPDS cpds_Customer = new DriverAdapterCPDS();
try { cpds_Customer.setDriver(productConfig.getProperty("dbcp.connection.customer.driver_class"));
} catch (ClassNotFoundException e) {
// log.error("setDriver Exception " + e);
e.printStackTrace();
}
}
回答by duffymo
Tomcat 7 requires that JDBC driver JARs must go in its /lib directory:
Tomcat 7 要求 JDBC 驱动程序 JAR 必须位于其 /lib 目录中：
http://tomcat.apache.org/tomcat-7.0-doc/jndi-datasource-examples-howto.html
http://tomcat.apache.org/tomcat-7.0-doc/jndi-datasource-examples-howto.html
Search for the word "forget".
搜索“忘记”这个词。
回答by soulcheck
Make sure the driver actually gets copied to your webapp WEB-INF/lib directory and to wtp deploy dir (something like /.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ in your workspace).
确保驱动程序实际上已复制到您的 webapp WEB-INF/lib 目录和 wtp 部署目录（类似于您工作区中的 /.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/）。
I find maven-wtp integration a bit worse than perfect as i stumble upon this problem very often.
我发现 maven-wtp 集成比完美更糟糕，因为我经常偶然发现这个问题。
回答by Ant3G
for this error: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
对于此错误：java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
you need to "Import com.mysql.jdbc.Driver;" even if its not used till app running.
你需要“导入com.mysql.jdbc.Driver；” 即使它直到应用程序运行才使用。
