Postgres JDBC driver: PSQLException: syntax error at or near RETURNING

Question

For some reason the JDBC PostgreSQL driver is adding: RETURNING * to the end of select statements. Why?

Code:

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Answer 1

The easiest way I've done this was adding ";--" at the end of sql code:

String sql = "INSERT INTO testTable(var1, var2) values ("1","2"), ("1","2") RETURNING id;--";

PreparedStatement ps = getConnection().prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
ps.executeUpdate();
ResultSet rs = ps.getGeneratedKeys();