JUnit TestConfiguration class uses engine code to determine JDBC level.
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                 Key: DERBY-1638
                 URL: http://issues.apache.org/jira/browse/DERBY-1638
             Project: Derby
          Issue Type: Improvement
          Components: Test
            Reporter: Daniel John Debrunner
         Assigned To: Daniel John Debrunner
            Priority: Minor


TestConfiguration uses the org.apache.derby.iapi.services.info.JVMInfo to 
determine if JDBC 4 is supported. Ideally test code should not be calling 
engine private api code.

Suggest two changes:

1) Determine JDBC level support from ability to load classes:
   E.g. JDBC2 - java.sql.Driver
            JDBC3 -  java.sql.Driver AND java.sql.ParameterMetaData
            JDBC4 - java.sql.Driver AND java.sql.SQLXML
            JSR169 - java.sql.ParameterMetaData AND NOT  java.sql.Driver 

2) Move the supportsJDBC4() method from TestConfiguraiton to JDBC, since if the 
VM supports JDBC4 or not is
not an attribute of a test configuration (and add other supportsJDBCX methods).

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