Spring-Boot-2.0.0-M1版本将默认的数据库连接池从tomcat jdbc pool改为了hikari

spring-configuration-metadata.json

spring-boot-autoconfigure-2.0.0.M7.jar!/META-INF/spring-configuration-metadata.json

 {
       "sourceType": "org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari",
       "name": "spring.datasource.hikari",
       "sourceMethod": "dataSource(org.springframework.boot.autoconfigure.jdbc.DataSourceProperties)",
       "type": "com.zaxxer.hikari.HikariDataSource"
     },
       {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.allow-pool-suspension",
       "type": "java.lang.Boolean"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.auto-commit",
       "type": "java.lang.Boolean"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.catalog",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.connection-init-sql",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.connection-test-query",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.connection-timeout",
       "type": "java.lang.Long"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.data-source-class-name",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.data-source-j-n-d-i",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.data-source-properties",
       "type": "java.util.Properties"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.driver-class-name",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.health-check-properties",
       "type": "java.util.Properties"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.health-check-registry",
       "type": "java.lang.Object"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.idle-timeout",
       "type": "java.lang.Long"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "deprecated": true,
       "name": "spring.datasource.hikari.initialization-fail-fast", //initializationFailTimeout > 0
       "type": "java.lang.Boolean",
       "deprecation": {}
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.initialization-fail-timeout",
       "type": "java.lang.Long"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.isolate-internal-queries",
       "type": "java.lang.Boolean"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.jdbc-url",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "deprecated": true,
       "name": "spring.datasource.hikari.jdbc4-connection-test", //废弃
       "type": "java.lang.Boolean",
       "deprecation": {}
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.leak-detection-threshold",
       "type": "java.lang.Long"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.login-timeout", //在HikariDataSource及PoolBase中
       "type": "java.lang.Integer"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.max-lifetime",
       "type": "java.lang.Long"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.maximum-pool-size",
       "type": "java.lang.Integer"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.metric-registry",
       "type": "java.lang.Object"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.metrics-tracker-factory",
       "type": "com.zaxxer.hikari.metrics.MetricsTrackerFactory"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.minimum-idle",
       "type": "java.lang.Integer"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.password",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.pool-name",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.read-only",
       "type": "java.lang.Boolean"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.register-mbeans",
       "type": "java.lang.Boolean"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.scheduled-executor",
       "type": "java.util.concurrent.ScheduledExecutorService"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "deprecated": true,
       "name": "spring.datasource.hikari.scheduled-executor-service",
       "type": "java.util.concurrent.ScheduledThreadPoolExecutor",
       "deprecation": {}
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.schema",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.transaction-isolation", //transactionIsolationName
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.username",
       "type": "java.lang.String"
     },
     {
       "sourceType": "com.zaxxer.hikari.HikariDataSource",
       "name": "spring.datasource.hikari.validation-timeout",
       "type": "java.lang.Long"
     },

HikariConfig

HikariCP-2.7.6-sources.jar!/com/zaxxer/hikari/HikariConfig.java

@SuppressWarnings({"SameParameterValue", "unused"})
public class HikariConfig implements HikariConfigMXBean
{
   private static final Logger LOGGER = LoggerFactory.getLogger(HikariConfig.class);

   private static final char[] ID_CHARACTERS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
   private static final long CONNECTION_TIMEOUT = SECONDS.toMillis(30);
   private static final long VALIDATION_TIMEOUT = SECONDS.toMillis(5);
   private static final long IDLE_TIMEOUT = MINUTES.toMillis(10);
   private static final long MAX_LIFETIME = MINUTES.toMillis(30);
   private static final int DEFAULT_POOL_SIZE = 10;
   //......

   /**
    * Default constructor
    */
   public HikariConfig()
   {
      dataSourceProperties = new Properties();
      healthCheckProperties = new Properties();

      minIdle = -1;
      maxPoolSize = -1;
      maxLifetime = MAX_LIFETIME;
      connectionTimeout = CONNECTION_TIMEOUT;
      validationTimeout = VALIDATION_TIMEOUT;
      idleTimeout = IDLE_TIMEOUT;
      initializationFailTimeout = 1;
      isAutoCommit = true;

      String systemProp = System.getProperty("hikaricp.configurationFile");
      if (systemProp != null) {
         loadProperties(systemProp);
      }
   }

   @Override
   public void setConnectionTimeout(long connectionTimeoutMs)
   {
      if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started.  Use HikariConfigMXBean for runtime changes.");

      if (connectionTimeoutMs == 0) {
         this.connectionTimeout = Integer.MAX_VALUE;
      }
      else if (connectionTimeoutMs < 250) {
         throw new IllegalArgumentException("connectionTimeout cannot be less than 250ms");
      }
      else {
         this.connectionTimeout = connectionTimeoutMs;
      }
   }

   @Override
   public void setIdleTimeout(long idleTimeoutMs)
   {
      if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started.  Use HikariConfigMXBean for runtime changes.");

      if (idleTimeoutMs < 0) {
         throw new IllegalArgumentException("idleTimeout cannot be negative");
      }
      this.idleTimeout = idleTimeoutMs;
   }

   @Override
   public void setMaximumPoolSize(int maxPoolSize)
   {
      if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started.  Use HikariConfigMXBean for runtime changes.");

      if (maxPoolSize < 1) {
         throw new IllegalArgumentException("maxPoolSize cannot be less than 1");
      }
      this.maxPoolSize = maxPoolSize;
   }

   @Override
   public void setMinimumIdle(int minIdle)
   {
      if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started.  Use HikariConfigMXBean for runtime changes.");

      if (minIdle < 0) {
         throw new IllegalArgumentException("minimumIdle cannot be negative");
      }
      this.minIdle = minIdle;
   }

   @Override
   public void setValidationTimeout(long validationTimeoutMs)
   {
      if (sealed) throw new IllegalStateException("The configuration of the pool is sealed once started.  Use HikariConfigMXBean for runtime changes.");

      if (validationTimeoutMs < 250) {
         throw new IllegalArgumentException("validationTimeout cannot be less than 250ms");
      }

      this.validationTimeout = validationTimeoutMs;
   }

   public void validate()
   {
      if (poolName == null) {
         poolName = generatePoolName();
      }
      else if (isRegisterMbeans && poolName.contains(":")) {
         throw new IllegalArgumentException("poolName cannot contain ':' when used with JMX");
      }

      // treat empty property as null
      catalog = getNullIfEmpty(catalog);
      connectionInitSql = getNullIfEmpty(connectionInitSql);
      connectionTestQuery = getNullIfEmpty(connectionTestQuery);
      transactionIsolationName = getNullIfEmpty(transactionIsolationName);
      dataSourceClassName = getNullIfEmpty(dataSourceClassName);
      dataSourceJndiName = getNullIfEmpty(dataSourceJndiName);
      driverClassName = getNullIfEmpty(driverClassName);
      jdbcUrl = getNullIfEmpty(jdbcUrl);

      // Check Data Source Options
      if (dataSource != null) {
         if (dataSourceClassName != null) {
            LOGGER.warn("{} - using dataSource and ignoring dataSourceClassName.", poolName);
         }
      }
      else if (dataSourceClassName != null) {
         if (driverClassName != null) {
            LOGGER.error("{} - cannot use driverClassName and dataSourceClassName together.", poolName);
            // NOTE: This exception text is referenced by a Spring Boot FailureAnalyzer, it should not be
            // changed without first notifying the Spring Boot developers.
            throw new IllegalStateException("cannot use driverClassName and dataSourceClassName together.");
         }
         else if (jdbcUrl != null) {
            LOGGER.warn("{} - using dataSourceClassName and ignoring jdbcUrl.", poolName);
         }
      }
      else if (jdbcUrl != null || dataSourceJndiName != null) {
         // ok
      }
      else if (driverClassName != null) {
         LOGGER.error("{} - jdbcUrl is required with driverClassName.", poolName);
         throw new IllegalArgumentException("jdbcUrl is required with driverClassName.");
      }
      else {
         LOGGER.error("{} - dataSource or dataSourceClassName or jdbcUrl is required.", poolName);
         throw new IllegalArgumentException("dataSource or dataSourceClassName or jdbcUrl is required.");
      }

      validateNumerics();

      if (LOGGER.isDebugEnabled() || unitTest) {
         logConfiguration();
      }
   }

   private void validateNumerics()
   {
      if (maxLifetime != 0 && maxLifetime < SECONDS.toMillis(30)) {
         LOGGER.warn("{} - maxLifetime is less than 30000ms, setting to default {}ms.", poolName, MAX_LIFETIME);
         maxLifetime = MAX_LIFETIME;
      }

      if (idleTimeout + SECONDS.toMillis(1) > maxLifetime && maxLifetime > 0) {
         LOGGER.warn("{} - idleTimeout is close to or more than maxLifetime, disabling it.", poolName);
         idleTimeout = 0;
      }

      if (idleTimeout != 0 && idleTimeout < SECONDS.toMillis(10)) {
         LOGGER.warn("{} - idleTimeout is less than 10000ms, setting to default {}ms.", poolName, IDLE_TIMEOUT);
         idleTimeout = IDLE_TIMEOUT;
      }

      if (leakDetectionThreshold > 0 && !unitTest) {
         if (leakDetectionThreshold < SECONDS.toMillis(2) || (leakDetectionThreshold > maxLifetime && maxLifetime > 0)) {
            LOGGER.warn("{} - leakDetectionThreshold is less than 2000ms or more than maxLifetime, disabling it.", poolName);
            leakDetectionThreshold = 0;
         }
      }

      if (connectionTimeout < 250) {
         LOGGER.warn("{} - connectionTimeout is less than 250ms, setting to {}ms.", poolName, CONNECTION_TIMEOUT);
         connectionTimeout = CONNECTION_TIMEOUT;
      }

      if (validationTimeout < 250) {
         LOGGER.warn("{} - validationTimeout is less than 250ms, setting to {}ms.", poolName, VALIDATION_TIMEOUT);
         validationTimeout = VALIDATION_TIMEOUT;
      }

      if (maxPoolSize < 1) {
         maxPoolSize = (minIdle <= 0) ? DEFAULT_POOL_SIZE : minIdle;
      }

      if (minIdle < 0 || minIdle > maxPoolSize) {
         minIdle = maxPoolSize;
      }
   }
}   

可以看到在set方法添加了参数校验，同时在configuration的构造器以及getConnection方法中也调用了validate方法

  public HikariDataSource(HikariConfig configuration)
    {
       configuration.validate();
       configuration.copyStateTo(this);
       this.seal();

       LOGGER.info("{} - Starting...", configuration.getPoolName());
       pool = fastPathPool = new HikariPool(this);
       LOGGER.info("{} - Start completed.", configuration.getPoolName());
    }

    /** {@inheritDoc} */
    @Override
    public Connection getConnection() throws SQLException
    {
       if (isClosed()) {
          throw new SQLException("HikariDataSource " + this + " has been closed.");
       }

       if (fastPathPool != null) {
          return fastPathPool.getConnection();
       }

       // See http://en.wikipedia.org/wiki/Double-checked_locking#Usage_in_Java
       HikariPool result = pool;
       if (result == null) {
          synchronized (this) {
             result = pool;
             if (result == null) {
                validate();
                LOGGER.info("{} - Starting...", getPoolName());
                try {
                   pool = result = new HikariPool(this);
                   this.seal();
                }
                catch (PoolInitializationException pie) {
                   if (pie.getCause() instanceof SQLException) {
                      throw (SQLException) pie.getCause();
                   }
                   else {
                      throw pie;
                   }
                }
                LOGGER.info("{} - Start completed.", getPoolName());
             }
          }
       }

       return result.getConnection();
    }

springboot的autoconfig是采用BeanUtils的反射来初始化HikariDataSource，走的是默认构造器，因此校验就依赖set方法以及后续的getConnection方法。

PoolBase.setLoginTimeout

HikariCP-2.7.6-sources.jar!/com/zaxxer/hikari/pool/PoolBase.java

   /**
     * Set the loginTimeout on the specified DataSource.
     *
     * @param dataSource the DataSource
     */
    private void setLoginTimeout(final DataSource dataSource)
    {
       if (connectionTimeout != Integer.MAX_VALUE) {
          try {
             dataSource.setLoginTimeout(Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout)));
          }
          catch (Throwable e) {
             LOGGER.info("{} - Failed to set login timeout for data source. ({})", poolName, e.getMessage());
          }
       }
    }

这个在初始化的时候设定了loginTimeout，初始值为Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout))

springboot的HikariDataSource默认配置的默认值如下

name	构造器默认值	默认配置validate之后的值	validate重置
minIdle	-1	10	minIdle<0或者minIdle>maxPoolSize,则被重置为maxPoolSize
maxPoolSize	-1	10	如果maxPoolSize小于1，则会被重置。当minIdle<=0被重置为DEFAULT_POOL_SIZE则为10;如果minIdle>0则重置为minIdle的值
maxLifetime	MINUTES.toMillis(30) = 1800000	1800000	如果不等于0且小于30秒则会被重置回30分钟
connectionTimeout	SECONDS.toMillis(30) = 30000	30000	如果小于250毫秒，则被重置回30秒
validationTimeout	SECONDS.toMillis(5) = 5000	5000	如果小于250毫秒，则会被重置回5秒
loginTimeout	10	30	Math.max(1, (int) MILLISECONDS.toSeconds(500L + connectionTimeout))，为connectionTimeout+500ms转为秒数取整 与 1 取最大者
idleTimeout	MINUTES.toMillis(10) = 600000	600000	如果idleTimeout+1秒>maxLifetime 且 maxLifetime>0，则会被重置为0；如果idleTimeout!=0且小于10秒，则会被重置为10秒
leakDetectionThreshold	0	0	如果大于0且不是单元测试，则进一步判断：(leakDetectionThreshold < SECONDS.toMillis(2) or (leakDetectionThreshold > maxLifetime && maxLifetime > 0)，会被重置为0 . 即如果要生效则必须>0，而且不能小于2秒，而且当maxLifetime > 0时不能大于maxLifetime
initializationFailTimeout	1	1	-
isAutoCommit	true	true	-
isReadOnly	false	fasle	-
isAllowPoolSuspension	false	false	-
isIsolateInternalQueries	false	false	-
isRegisterMbeans	false	false	-
sealed	false	true	运行启动后这个标志为true，表示不再运行修改
poolName	null	HikariPool-1	-
catalog	null	null	-
connectionInitSql	null	null	-
connectionTestQuery	null	null	-
dataSourceClassName	null	null	-
schema	null	null	-
transactionIsolationName	null	null	-
dataSource	null	null	-
dataSourceProperties	{}	{}	-
threadFactory	null	null	-
scheduledExecutor	null	null	-
metricsTrackerFactory	null	null	-
metricRegistry	null	null	-
healthCheckRegistry	null	null	-
healthCheckProperties	{}	{}	-

doc

• Spring-Boot-2.0.0-M1-Release-Notes

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