通过JDBC网址，它看起来像您正在尝试连接到Derby服务器而不是嵌入式实例。如果您尝试连接到服务器实例，请注意以下几点：

By the JDBC url, it's looks like you're trying to connect to a Derby server vs. an embedded instance. If you are trying to connect to a server instance, here are some considerations:

• 您是否自己启动了服务器，mydb是否已经存在？


• 如果没有，你是否传递了正确的参数来创建（例如; create = true）
  示例：jdbc：derby：// localhost： 1527 / dbname; create = true


• 如果mydb确实存在，您是否将服务器指向正确的位置？
  
  
  
  • 也取决于用于启动derby的内容（例如嵌入式vs网络驱动程序），默认数据库位置也不同。你可以在这里阅读关于它
  
  
  • did you start the server yourself, did mydb already exists?
  • if not, did you pass in the correct params to create (e.g. ;create=true) example: jdbc:derby://localhost:1527/dbname;create=true
  • if mydb did exists, are you pointing the server to the correct location?
    • also, depending on what was used to start derby (e.g. embedded vs network driver) default database locations are different as well. You can read about it here

    基本上你得到的例外是Derby说它无法找到你的数据库 - 它基本上是路径问题。

    Basically the exception you're getting is that Derby's saying it can't find your database - it's basically a path issue.