diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
index b400aeb95e263664fcce4791b8a661523b086c86..f980dd041b3eff0aa09868490f0678ee1f8b1ab7 100755
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java
@@ -49,7 +49,10 @@ public class TSDBJNIConnector {
                 for (String key : props.stringPropertyNames()) {
                     configJSON.put(key, props.getProperty(key));
                 }
-                setConfig(configJSON.toJSONString());
+                int ret = setConfigImp(configJSON.toJSONString());
+                if (ret == -1) {
+                    throw TSDBError.createSQLWarning("failed to set config, invalid json format: " + configJSON.toJSONString());
+                }
 
                 String configDir = props.getProperty(TSDBDriver.PROPERTY_KEY_CONFIG_DIR);
                 initImp(configDir);
@@ -79,10 +82,6 @@ public class TSDBJNIConnector {
 
     private static native String getTsCharset();
 
-    public static void setConfig(String config) {
-        setConfigImp(config);
-    }
-
     private static native int setConfigImp(String config);
 
     public boolean connect(String host, int port, String dbName, String user, String password) throws SQLException {