I'm also getting the same error. We are using WLI 10.2 with Oracle 10g.
Also observed that while trying to create a trigger on a table 'No columns' are shown. But if we select a synonym for the trigger the column are shown but getting an sql exception. like :
java.sql.SQLException: [BEA][Oracle JDBC Driver][Oracle]ORA-00904: "NAME": invalid identifier
Please help advice.