java fuck

a.java

    private PreparedStatement getPreparedCategoryQuery() {
        if (categoryPreparedQuery == null) {
            try {
                categoryPreparedQuery = dbconn.prepareStatement("INSERT INTO category (code) values(?)");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        try {
            categoryPreparedQuery.clearParameters();
            categoryPreparedQuery.clearWarnings();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return categoryPreparedQuery;

    }

    public void createCategory(String code) {
        LOG.info("CREATING Category with code     =   " + code);
        PreparedStatement st = getPreparedCategoryQuery();
        try {
            st.setString(1, code);
            boolean result = st.execute();
            if (!result) {
                LOG.error("FAILED ADD CATEGORY with code = " + code);
                LOG.error(st.getWarnings());
            }else{
                LOG.info("success");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }