[TD-5614]<hotfix>: handle client and server time not synchronized (#7109)

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java

@@ -80,7 +80,8 @@ public class TSDBJNIConnector {
 
         this.taos = this.connectImp(host, port, dbName, user, password);
         if (this.taos == TSDBConstants.JNI_NULL_POINTER) {
-            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_JNI_CONNECTION_NULL);
+            String errMsg = this.getErrMsg(0);
+            throw TSDBError.createSQLException(TSDBErrorNumbers.ERROR_JNI_CONNECTION_NULL, errMsg);
         }
         // invoke connectImp only here
         taosInfo.conn_open_increment();