Hello List,
I'm using the DBAppender with Logback 1.0.7 and I'm getting the following
Exception:
11:54:18,066 |-ERROR in ch.qos.logback.access.db.DBAppender[DB] - problem
appending event java.lang.ClassCastException:
ch.qos.logback.classic.spi.LoggingEvent cannot be cast to
ch.qos.logback.access.spi.IAccessEvent
at java.lang.ClassCastException:
ch.qos.logback.classic.spi.LoggingEvent cannot be cast to
ch.qos.logback.access.spi.IAccessEvent
at at
ch.qos.logback.access.db.DBAppender.subAppend(DBAppender.java:36)
at at
ch.qos.logback.core.db.DBAppenderBase.append(DBAppenderBase.java:108)
at at
ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88)
at at
ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48)
at at
ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:280)
at at ch.qos.logback.classic.Logger.callAppenders(Logger.java:267)
at at
ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:449)
at at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:421)
at at ch.qos.logback.classic.Logger.info(Logger.java:611)
at at de.swm.pmf.logtest.LoggingThread.run(LoggingThread.java:16)
at at java.lang.Thread.run(Unknown Source)"
I'm not quite certain what the problem is, but I was looking through the code
and have found the following:
Logger.appendLoopOnAppenders has ILoggingEvent as an Parameter, this Parameter
is passed through to the AppenderAttachableImpl.appendLoopOnAppenders, which is
ok as the AAI is typed as AAI<ILoggingEvent>. The AAI has a List<Appender<E>>
where E seems to be bound to the Type of the AAI, which is ILoggingEvent.
UnsynchronizedAppenderBase is still typed as ILoggingEvent and therefore
UnsynchronizedAppenderBase.doAppend takes an ILoggingEvent as Parameter and
passes that through to ch.qos.logback.core.db.DBAppender.append, where we are
leaving package ch.qos.logback.core.db for ch.qos.logback.access.db and the
DBAppender there (a child of the core-DBAppender) is typed as
DBAppender<IAccessEvent>, hence the ClassCastException.
What I'm not getting is, why the code compiled originally, because clearly the
DBAppender cannot be typed ILoggingEvent and IAccessEvent at the same time.
I appreciate any help or pointers because searching the web gives nothing
useful and I'm really stuck here.
Kind regards,
Jonathan
My configuration is pretty much straight forward, stolen from the example:
<configuration>
<statusListener
class="ch.qos.logback.core.status.OnConsoleStatusListener" />
<appender name="DB" class="ch.qos.logback.access.db.DBAppender">
<connectionSource
class="ch.qos.logback.core.db.DriverManagerConnectionSource">
<driverClass>com.mysql.jdbc.Driver</driverClass>
<url>jdbc:mysql://localhost:3306/logbackdb</url>
<user>root</user>
<password>mysqlroot</password>
</connectionSource>
<insertHeaders>false</insertHeaders>
</appender>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder
by default -->
<encoder>
<pattern>%-4relative [%thread] %-5level -
%msg%n</pattern>
</encoder>
</appender>
<root level="debug">
<appender-ref ref="STDOUT" />
</root>
<logger name="logexample" additivity="false">
<appender-ref ref="DB" />
</logger>
</configuration>
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