找不到Java数据库驱动程序，即使它位于jar文件中

Question

I have a Java application that connects to a SQLServer database, and it is intended to run at the commandline. In the maven dependencies I have added the following:

<dependency>
    <groupId>net.sourceforge.jtds</groupId>
    <artifactId>jtds</artifactId>
    <version>1.3.1</version>
</dependency>

When I run the program via Intellij, I am able to run it with no issues. When I take the jar file that is created and crack it open, I can see the JTDS driver:

However, when I try to run the jar at the commandline with the exact same arguments that I used in the Intellij run configuration, I get the error:

Caused by: java.sql.SQLException: No suitable driver found for jdbc:jtds:sqlserver://databaseserver:1433/database 

The command I run is

java -jar jarname.jar -cfg ../config.xml

This doesn't seem to be related to this particular driver, as I have the same issue if I connect to an Oracle database and include the Oracle thin driver dependency instead. (However, just to make things fun, if I add a Postgres driver dependency, it runs just fine on the command line connecting to a Postgres database.)

If I manually add the driver jar (same version as the maven dependency) to the classpath, the jar does run properly.

What could be causing the driver inside the jar to not be on the classpath? (Or is there something else that could be causing the issue?)

Answer 1

MadProgrammer在上面的评论是一个问题：我没有注册驱动程序，因为我没有意识到它是JDBC 3.0驱动程序，而不是JDBC 4.0。