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https://issues.apache.org/jira/browse/LOG4J2-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727263#comment-13727263
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Nick Williams commented on LOG4J2-330:
--------------------------------------
By the way: Unfortunately MongoDB does not provide a way to configure
transformers on a per-connection basis. It's a static configuration, which is
global and affects everything. There's no way really around this. If
per-connection transformers had been allowed, I would have made this
configurable. Since it has to be static (potentially affecting multiple
applications in certain environments), I made the transformer use the String
Level name, which is more verbose and less fragile than using the ordinal,
level number, etc. Note that this is different than the one you are using, and
so will result in log events being persisted differently.
> NoSQLAppender cannot insert log event to MongoDB
> ------------------------------------------------
>
> Key: LOG4J2-330
> URL: https://issues.apache.org/jira/browse/LOG4J2-330
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0-beta8
> Environment: JDK 1.7, Mongo Driver 2.11.2
> Reporter: Ruslan
> Assignee: Nick Williams
> Fix For: 2.0-beta9
>
>
> Seems like NoSQLAppender can't insert any log events to Mongo due to lack of
> serializer for Level enum.
> {quote}
> 2013-07-31 18:19:27,831 ERROR An exception occurred processing Appender
> databaseAppender java.lang.IllegalArgumentException: can't serialize class
> org.apache.logging.log4j.Level
> at org.bson.BasicBSONEncoder._putObjectField(BasicBSONEncoder.java:270)
> at org.bson.BasicBSONEncoder.putObject(BasicBSONEncoder.java:174)
> at org.bson.BasicBSONEncoder.putObject(BasicBSONEncoder.java:120)
> at com.mongodb.DefaultDBEncoder.writeObject(DefaultDBEncoder.java:27)
> at com.mongodb.OutMessage.putObject(OutMessage.java:289)
> at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:239)
> at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:204)
> at com.mongodb.DBCollection.insert(DBCollection.java:148)
> at com.mongodb.DBCollection.insert(DBCollection.java:91)
> at
> org.apache.logging.log4j.core.appender.db.nosql.mongo.MongoDBConnection.insertObject(MongoDBConnection.java:61)
> {quote}
> Here is my config
> {quote}
> <configuration status="WARN">
> <appenders>
> <NoSql name="databaseAppender" suppressExceptions="true">
> <MongoDb collectionName="applicationLog"
> factoryClassName="com.borsch.DBManager" factoryMethodName="getNewMongoClient"
> writeConcernConstant="NONE" username="root" password="qwe"/>
> </NoSql>
> </appenders>
> <loggers>
> <root level="error">
> <appender-ref ref="databaseAppender"/>
> </root>
> </loggers>
> </configuration>
> {quote}
> For now I used following workaround (code is in Scala)
> {code}
> class LevelBSONEncoder extends org.bson.Transformer {
> def transform(o: Any): AnyRef =
> o match { case level: org.apache.logging.log4j.Level => new
> java.lang.Integer(level.intLevel()) }
> }
> // which is used like this
> org.bson.BSON.addEncodingHook(org.apache.logging.log4j.Level.ERROR.getClass,
> new LevelBSONEncoder())
> {code}
> I think it should be done in appender.
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