Java Lesson Set Packaging operations

Recently in the Java class set up to pack things to the teacher encountered many wonderful problems,

The first is the prompt when the database is copied:

This is a database that is not separated from the SQL Server service (I am using SQL Server for the time being, and for others, I will continue to try later) can do the following

Open SQL Server to find the database that needs to be detached right-click-----> Tasks----> Detach

So you can copy and paste it.

Then the Java source file is exported as a runnable jar file.

Export jar

Error message when exporting a copy paste

The operation cannot be completed because the file is already open in Java (TM) Platform SE binary

At this point only Task Manager----> Process----> Click Java (TM) Platform SE binary right bottom corner to end the process

Java Lesson Set Packaging operations