QueryRunner is not thread-safe
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                 Key: DBUTILS-52
                 URL: https://issues.apache.org/jira/browse/DBUTILS-52
             Project: Commons DbUtils
          Issue Type: Bug
            Reporter: Dan Fabulich


sebb pointed out:  "QueryRunner Javadoc says the class is thread-safe. However 
it has a protected mutable variable DataSource which can also be set/got via 
public methods. If one thread sets the variable, another may not see the 
correct value, so the class is not thread-safe."

We should make the DataSource final and remove the setter.

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