exceptionfactory commented on pull request #5794:
URL: https://github.com/apache/nifi/pull/5794#issuecomment-1051278540


   @MikeThomsen, for `TestJdbcCommon`, it looks like the Derby shutdown 
operation deregisters the driver, causing the exceptions.  Adding a explicit 
line in the setup method to register the Derby EmbeddedDriver allowed all 
methods to work:
   
   ```
   DriverManager.registerDriver(new EmbeddedDriver());
   ```
   
   Alternatively, removing the shutdown call in the cleanup method, but 
retaining the recursive delete seems like an acceptable solution:
   
   ```
       @AfterEach
       public void cleanup() throws IOException {
           if (tempFile.exists()) {
               FileUtils.deleteFile(tempFile, true);
           }
       }
   ```


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