Playframework 2.0 播放重新启动时出现DBappender错误

我有一个设置，记录从某个记录器到数据库的消息。下面是我的logger.xml的相关组件：

<appender name="DB" class="ch.qos.logback.classic.db.DBAppender">
  <connectionSource class="ch.qos.logback.core.db.DriverManagerConnectionSource">
    <driverClass>org.postgresql.Driver</driverClass>
    <url>jdbc:postgresql://localhost:5432/logback</url>
    <user>ashishag</user>
    <password>password</password>
  </connectionSource>
</appender>

它可以很好地确定驱动程序名称。 但是，当我保存一个导致play编译文件并重新启动服务器的文件时，DB appender停止工作

20:21:29,183 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.classic.db.DBAppender]
20:21:29,183 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [DB]
20:21:29,184 |-WARN in ch.qos.logback.core.db.DriverManagerConnectionSource@a80681 - Could not discover the dialect to use. java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/logback
        at java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/logback
        at      at java.sql.DriverManager.getConnection(DriverManager.java:596)
        at      at java.sql.DriverManager.getConnection(DriverManager.java:215)


---snip--
20:21:29,195 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@44:14 - RuntimeException in Action for tag [appender] java.lang.IllegalStateException: DBAppender cannot function if the JDBC driver does not support getGeneratedKeys method *and* without a specific SQL dialect
        at java.lang.IllegalStateException: DBAppender cannot function if the JDBC driver does not support getGeneratedKeys method *and* without a specific SQL dialect
        at      at ch.qos.logback.core.db.DBAppenderBase.start(DBAppenderBase.java:62)
        at      at ch.qos.logback.classic.db.DBAppender.start(DBAppender.java:92)

看起来它无法加载驱动程序。（也许这就是为什么声称getGeneratedKeys不受支持的原因）

总结如下： 启动服务器：

驱动程序名称=PostgreSQL本机驱动程序

驱动程序版本=PostgreSQL 9.0

JDBC4（build 801）支持GetGeneratedKeys=true

---

重新启动服务器： 声明未找到方言（未找到驱动程序）和GeneratedKey不受支持

有人知道怎么了吗

20:21:29,183 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.classic.db.DBAppender]
20:21:29,183 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [DB]
20:21:29,184 |-WARN in ch.qos.logback.core.db.DriverManagerConnectionSource@a80681 - Could not discover the dialect to use. java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/logback
        at java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/logback
        at      at java.sql.DriverManager.getConnection(DriverManager.java:596)
        at      at java.sql.DriverManager.getConnection(DriverManager.java:215)


---snip--
20:21:29,195 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@44:14 - RuntimeException in Action for tag [appender] java.lang.IllegalStateException: DBAppender cannot function if the JDBC driver does not support getGeneratedKeys method *and* without a specific SQL dialect
        at java.lang.IllegalStateException: DBAppender cannot function if the JDBC driver does not support getGeneratedKeys method *and* without a specific SQL dialect
        at      at ch.qos.logback.core.db.DBAppenderBase.start(DBAppenderBase.java:62)
        at      at ch.qos.logback.classic.db.DBAppender.start(DBAppender.java:92)