We don't have a NativeJDBCExtractor for the Websphere datasource:

org.springframework.dao.DataAccessResourceFailureException: Could not create Oracle LOB; nested exception is org.s ringframework.dao.InvalidDataAccessApiUsageException: OracleLobCreator needs to work on oracle.jdbc.OracleConnection, not on class com.ibm.ws.rsadapter.jdbc.WSJdbcConnection - specify a corresponding NativeJdbcExtractor
org.springframework.dao.InvalidDataAccessApiUsageException: OracleLobCreator needs to work on oracle.jdbc.OracleConnection, not on class com.ibm.ws.rsadapter.jdbc.WSJdbcConnection] - specify a corresponding NativeJdbcExtractor

The current workaround is to not use datasources with Oracle under Websphere. Use Confluence's internal connection pooling (the direct JDBC connection option) instead.