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Bug 326030

Summary:	Medic diagnostics for unsupported appender types is poor
Product:	[RT] Virgo	Reporter:	Steve Powell <zteve.powell>
Component:	unknown	Assignee:	Glyn Normington <glyn.normington>
Status:	CLOSED FIXED	QA Contact:
Severity:	normal
Priority:	P3	CC:	glyn.normington
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	Mac OS X - Carbon (unsup.)
Whiteboard:

Description Steve Powell

2010-09-23 06:35:23 EDT

When using SMTPAppender in serviceability.xml, logback/medic throws an exception during startup which omits mention of the underlying error -- 

--8<-----
org.eclipse.virgo.medic.log.impl.logback.LoggerContextConfigurationFailedException: Configuration failed with the following problems: [Could not create an Appender of type [ch.qos.logback.classic.net.SMTPAppender]., ActionException in Action for tag [appender]]
	at org.eclipse.virgo.medic.log.impl.logback.JoranLoggerContextConfigurer.reportFailureIfNecessary(JoranLoggerContextConfigurer.java:50)
	at org.eclipse.virgo.medic.log.impl.logback.JoranLoggerContextConfigurer.applyConfiguration(JoranLoggerContextConfigurer.java:42)
---------

which is actually a NoClassDefFound error.

The diagnostic code should be improved to put the cause (and the accompanying stacktrace) on the exception that is presently thrown so we can diagnose the problem.

Comment 1 Steve Powell

2010-09-23 09:31:55 EDT

Came from investigation in Bug 322398

Comment 2 Glyn Normington

2010-09-27 11:11:47 EDT

If available, it now also prints the cause. For example:

org.eclipse.virgo.medic.log.impl.logback.LoggerContextConfigurationFailedException: Configuration failed with the following problems: [Could not create an Appender of type [ch.qos.logback.classic.net.SMTPAppender]. Caused by java.lang.NoClassDefFoundError: javax/mail/Multipart., ActionException in Action for tag [appender] Caused by ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type ch.qos.logback.classic.net.SMTPAppender.]
	at org.eclipse.virgo.medic.log.impl.logback.JoranLoggerContextConfigurer.reportFailureIfNecessary(JoranLoggerContextConfigurer.java:54)
	at <etc.>

The crucial information buried inside the list of 2 errors is:

java.lang.NoClassDefFoundError: javax/mail/Multipart

which shows that javax.mail is the optional import in medic which needs satisfying.