Need to rework the default method placement to avoid errors such as:

p4/dev/src1222/mod/datasource/general/datasource6/src/main/java/weblogic/jdbc/wrapper/XAConnection.java:40: error: class weblogic.jdbc.wrapper.XAConnection inherits unrelated defaults for setShardingKey(ShardingKey) from types javax.sql.XAConnection and Connection
p4/dev/src1222/mod/datasource/general/datasource6/src/main/java/weblogic/jdbc/wrapper/AbstractXADataSource.java:11: error: class AbstractXADataSource inherits unrelated defaults for createShardingKeyBuilder() from types XADataSource and DataSource