java 命令行： java.lang.ClassNotFoundException 当 JAR 在当前文件夹中但不是在解压缩时

Question

A simple Java code has this line:

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

The code fail at this line with exception

Exception in thread "main" java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver

When I put sqljdbc41.jar in current folder. This jar has above driver. I also have included current folder "." in CLASSPATH env variable.

However above code line does not give any problem and code runs successfully when I unzip this jar file, which creates folder hierarchy "com\microsoft\sqlserver\jdbc" in the current folder.

Where I am missing? How can I set CLASSPATH? How can I include jar files when running code using java command line?

Answer 1

Instead of using the 4-year-old JDBC driver sqljdbc41.jar directly, you should use a dependency management tool, for example, Maven . Then, as described in the driver home page , it can be added to a Maven project by adding it as a dependency in the POM file with the following code:

<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>10.2.1.jre17</version>
</dependency>

See the Maven Central Repository for the latest version.