OracleDictionary.getEmptyClob uses its classloader instead of the current 
classloader. 
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                 Key: OPENJPA-542
                 URL: https://issues.apache.org/jira/browse/OPENJPA-542
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 1.0.2, 1.0.1, 1.0.0
            Reporter: Michael Dick
             Fix For: 1.0.3, 1.1.0


The OracleDictionary class calls Class.forName("oracle.sql.CLOB") and 
Class.forName("oracle.sql.BLOB") to get the class objects for BLOBs and CLOBs. 
This approach uses the classloader which loaded OracleDictionary, which might 
not have access to the Oracle JDBC classes ie if OpenJPA is in a different OSGi 
bundle from the jdbc driver. 

Instead we should get the current classloader which is more likely to contain 
the JDBC driver classes. 

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