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    /**
     * JSON API for test connection button
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException 
     */
    public void webService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //Limit the API for admin usage only
        boolean isAdmin = WorkflowUtil.isCurrentUserInRole(WorkflowUserManager.ROLE_ADMIN);
        if (!isAdmin) {
            response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        
        String action = request.getParameter("action");
        if ("testConnection".equals(action)) {
            String message = "";
            Connection conn = null;
            try {
                AppDefinition appDef = AppUtil.getCurrentAppDefinition();
                
                String jdbcDriver = AppUtil.processHashVariable(request.getParameter("jdbcDriver"), null, null, null, appDef);
                String jdbcUrl = AppUtil.processHashVariable(request.getParameter("jdbcUrl"), null, null, null, appDef);
                String jdbcUser = AppUtil.processHashVariable(request.getParameter("jdbcUser"), null, null, null, appDef);
                String jdbcPassword = AppUtil.processHashVariable(SecurityUtil.decrypt(request.getParameter("jdbcPassword")), null, null, null, appDef);
                
                Class.forName(jdbcDriver);
                conn = DriverManager.getConnection(jdbcUrl, jdbcUser, jdbcPassword);
                
                message = ResourceBundleUtilAppPluginUtil.getMessage("form.jdbcOptionsBinder.connectionOk", getClassName(), MESSAGE_PATH);
            } catch (Exception e) {
                LogUtil.error(getClassName(), e, "Test Connection error");
                message = ResourceBundleUtilAppPluginUtil.getMessage("form.jdbcOptionsBinder.connectionFail", getClassName(), MESSAGE_PATH) + "\n"  + StringEscapeUtils.escapeJavaScript(e.getMessage());
            } finally {
                try {
                    if (conn != null && !conn.isClosed()) {
                        conn.close();
                    }
                } catch (Exception e) {
                    LogUtil.error(DynamicDataSourceManager.class.getName(), e, "");
                }
            }
            try {
                JSONObject jsonObject = new JSONObject();
                jsonObject.accumulate("message", message);
                jsonObject.write(response.getWriter());
            } catch (Exception e) {
                //ignore
            }
        } else {
            response.setStatus(HttpServletResponse.SC_NO_CONTENT);
        }
    }