MysqlTimeoutTest.java

/*
 *    Copyright 2009-2025 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       https://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.datasource.pooled;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.concurrent.TimeUnit;

import org.apache.ibatis.testcontainers.MysqlContainer;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

@Tag("TestcontainersTests")
class MysqlTimeoutTest {

  @Test
  void shouldReconnectWhenServerKilledLeakedConnection() throws Exception {
    // See #748
    PooledDataSource ds = MysqlContainer.getPooledDataSource();
    ds.setPoolMaximumActiveConnections(1);
    ds.setPoolMaximumIdleConnections(1);
    ds.setPoolTimeToWait(1000);
    ds.setPoolMaximumCheckoutTime(2000);
    ds.setPoolPingEnabled(true);
    ds.setPoolPingQuery("select 1");
    ds.setDefaultAutoCommit(true);
    // MySQL wait_timeout * 1000 or less. (unit:ms)
    ds.setPoolPingConnectionsNotUsedFor(1000);

    Connection con1 = ds.getConnection();

    Statement stmt = con1.createStatement();
    stmt.execute("set session wait_timeout = 3");

    executeQuery(con1);
    // Simulate connection leak by not closing.
    // con1.close();

    // Wait for disconnected from mysql...
    Thread.sleep(TimeUnit.SECONDS.toMillis(3));

    // Should return usable connection.
    Connection con2 = ds.getConnection();
    executeQuery(con2);

    con1.close();
    con2.close();
  }

  private void executeQuery(Connection con) throws SQLException {
    try (PreparedStatement st = con.prepareStatement("select 1"); ResultSet rs = st.executeQuery()) {
      while (rs.next()) {
        assertEquals(1, rs.getInt(1));
      }
    }
  }

}