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https://issues.apache.org/jira/browse/KARAF-3067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043435#comment-14043435
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Achim Nierbeck commented on KARAF-3067:
---------------------------------------
Looks like your appender requires a mail bundle, most likely it's an optional
import.
Therefore you should add a mail bundle one of your own feature bundles with a
startlevel lower of equal to the pax-logging one.
> NoClassDefFoundError on startup when log4j SMTPAppender is configured
> ---------------------------------------------------------------------
>
> Key: KARAF-3067
> URL: https://issues.apache.org/jira/browse/KARAF-3067
> Project: Karaf
> Issue Type: Bug
> Components: karaf-config
> Affects Versions: 3.0.1
> Reporter: Jochen Kraushaar
>
> *Problem:*
> When you add a SMTPAppender to your etc/org.ops4j.pax.logging.cfg file, a
> NoClassDefFoundError is thrown on startup of Karaf.
> *Stacktrace:*
> {code}
> 2014-06-25 14:08:43,552 | ERROR | s4j.pax.logging) | configadmin
> | 10 - org.apache.felix.configadmin - 1.6.0 |
> [org.osgi.service.log.LogService, org.knopflerfish.service.log.LogService,
> org.ops4j.pax.logging.PaxLoggingService, org.osgi.service.cm.ManagedService,
> id=9, bundle=8/mvn:org.ops4j.pax.logging/pax-logging-service/1.7.2]:
> Unexpected problem updating configuration org.ops4j.pax.logging
> java.lang.NoClassDefFoundError: javax/mail/internet/AddressException
> at java.lang.Class.getDeclaredConstructors0(Native Method)
> at java.lang.Class.privateGetDeclaredConstructors(Class.java:2493)
> at java.lang.Class.getConstructor0(Class.java:2803)
> at java.lang.Class.newInstance(Class.java:345)
> at
> org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:336)
> at
> org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:123)
> at
> org.apache.log4j.PaxLoggingConfigurator.parseAppender(PaxLoggingConfigurator.java:97)
> at
> org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:735)
> at
> org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:615)
> at
> org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:502)
> at
> org.apache.log4j.PaxLoggingConfigurator.doConfigure(PaxLoggingConfigurator.java:72)
> at
> org.ops4j.pax.logging.service.internal.PaxLoggingServiceImpl.updated(PaxLoggingServiceImpl.java:214)
> at
> org.ops4j.pax.logging.service.internal.PaxLoggingServiceImpl$1ManagedPaxLoggingService.updated(PaxLoggingServiceImpl.java:362)
> at
> org.apache.felix.cm.impl.helper.ManagedServiceTracker.updateService(ManagedServiceTracker.java:148)
> at
> org.apache.felix.cm.impl.helper.ManagedServiceTracker.provideConfiguration(ManagedServiceTracker.java:81)
> at
> org.apache.felix.cm.impl.ConfigurationManager$UpdateConfiguration.run(ConfigurationManager.java:1723)
> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:103)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException:
> javax.mail.internet.AddressException not found by
> org.ops4j.pax.logging.pax-logging-service [8]
> at
> org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1532)
> at
> org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
> at
> org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1955)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> ... 18 more
> {code}
> *Changes made in org.ops4j.pax.logging.cfg:*
> Add e-mail appender:
> {code}
> log4j.appender.email=org.apache.log4j.net.SMTPAppender
> log4j.appender.email.Threshold=FATAL
> log4j.appender.email.SMTPHost=your_host
> log4j.appender.email.From=your_mail
> log4j.appender.email.To=your_mail
> log4j.appender.email.Subject=Fatal error
> log4j.appender.email.bufferSize=512
> log4j.appender.email.layout=org.apache.log4j.HTMLLayout
> log4j.appender.email.layout.Title=Fatal error
> {code}
> Add appender to root logger:
> {code}
> log4j.rootLogger=INFO, out, email, osgi:*
> {code}
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