change

tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/components/JdbcTaosdemoConfig.java

@@ -4,7 +4,7 @@ import com.taosdata.taosdemo.utils.TimeStampUtil;
 
 public final class JdbcTaosdemoConfig {
     // instance
-    public String host = "master";          //host
+    public String host;                     //host
     public int port = 6030;                 //port
     public String user = "root";            //user
     public String password = "taosdata";    //password

tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/service/SubTableService.java

@@ -33,6 +33,11 @@ public class SubTableService extends AbstractService {
             executor.execute(() -> createSubTable(superTableMeta, prefixOfTable + (tableIndex + 1)));
         }
         executor.shutdown();
+        try {
+            executor.awaitTermination(Long.MAX_VALUE,TimeUnit.NANOSECONDS);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
     }
 
     public void createSubTable(SuperTableMeta superTableMeta, String tableName) {

tests/examples/JDBC/taosdemo/src/main/resources/application.properties

@@ -16,6 +16,6 @@ spring.datasource.password=taosdata
 #logging.level.com.taosdata.taosdemo.dao=error
 
 jdbc.driver=com.taosdata.jdbc.rs.RestfulDriver
-hikari.maximum-pool-size=500
-hikari.minimum-idle=100
+hikari.maximum-pool-size=1
+hikari.minimum-idle=1
 hikari.max-lifetime=0