線上資料庫出現mysql 8小時異常.需要增加如下配置:

org.quartz.dataSource.QRTZ_DS.idleConnectionValidationSeconds=60
org.quartz.dataSource.QRTZ_DS.validateOnCheckout=true
org.quartz.dataSource.QRTZ_DS.discardIdleConnectionsSeconds=0

增加後問題解決.

/** The JDBC database driver. */指定連線驅動
public static final String DB_DRIVER = "driver"
 
;

  /** The JDBC database URL. */  連線字串
 public static final String DB_URL = "URL";


 /** The database user name. */ 使用者名稱
 public static final String DB_USER = "user";

 /** The database user password. */ 密碼
 public static final String DB_PASSWORD = "password";

 /** The maximum number of database connections to have in the pool.  Default is 10. */
 
 連線池最大連線數
 public static final String DB_MAX_CONNECTIONS = "maxConnections";

 /**
  * The maximum number of prepared statements that will be cached per connection in the pool.
  * Depending upon your JDBC Driver this may significantly help performance, or may slightly
  * hinder performance.  
  * Default is 120, as Quartz uses over 100 unique statements. 0 disables the feature.
  */
 
     每個連結最多快取多少個預編譯語句
 public static final String DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = "maxCachedStatementsPerConnection";

 /**
  * The database sql query to execute every time a connection is returned
  * to the pool to ensure that it is still valid.
  */  驗證連線是否可用的查詢語句
 public static final String DB_VALIDATION_QUERY = "validationQuery";

 /**
  * The number of seconds between tests of idle connections - only enabled
  * if the validation query property is set.  Default is 50 seconds.
  */   多久驗證空閒連線
 public static final String DB_IDLE_VALIDATION_SECONDS = "idleConnectionValidationSeconds";

 /**
  * Whether the database sql query to validate connections should be executed every time
  * a connection is retrieved from the pool to ensure that it is still valid.  If false,
  * then validation will occur on check-in.  Default is false.
  */  是否每次從池中取連線時，驗證連線可用性
 public static final String DB_VALIDATE_ON_CHECKOUT = "validateOnCheckout";

 /** Discard connections after they have been idle this many seconds.  0 disables the feature. Default is 0.*/   空閒連線超過多少秒丟棄
 private static final String DB_DISCARD_IDLE_CONNECTIONS_SECONDS = "discardIdleConnectionsSeconds";

 /** Default maximum number of database connections in the pool. */  最大連線數
 public static final int DEFAULT_DB_MAX_CONNECTIONS = 10;

 /** Default maximum number of database connections in the pool. */   預設每個連結快取120個預編譯語句
 public static final int DEFAULT_DB_MAX_CACHED_STATEMENTS_PER_CONNECTION = 120;

quartz連線池配置對C3PO連線池配置進行了一些封裝， 留作記錄。

mysql 斷開連線可以通過設定 validateOnCheckout=true + validationQuery

或者設定discardIdleConnectionsSeconds 少於8小時解決。