Hello, I tried to centralize logging in our docker environment by using logback as default logging framework. The idea is to use logback in our core application which compiles to a *.war file which is deployed in an Apache Tomcat v8.5. We now use Docker and I want to get a logging setup in our swarm like that: Our own *.war file is already successfully logging to STDOUT with logback and the logstash-logback-encoder. After I deployed the war to Tomcat running within a Docker container I realized that more information coming from Tomcat is logged via STDOUT and this is not in JSON format. I also read about logback-access and how to use it in Tomcat so I first added logback-access to the classpath of Tomcat and added a logback-access.xml config file as well. In the server.xml I added <Valve className="ch.qos.logback.access.tomcat.LogbackValve"/>. The server.xml looks like: <?xml version="1.0" encoding="UTF-8"?> <Server port="8005" shutdown="SHUTDOWN"> <!--<Listener className="org.apache.catalina.startup.VersionLoggerListener"/>--> <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on"/> <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/> <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/> <GlobalNamingResources> <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml"/> </GlobalNamingResources> <Service name="Catalina"> <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443"/> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/> <Engine name="Catalina" defaultHost="localhost"> <Realm className="org.apache.catalina.realm.LockOutRealm"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> </Realm> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true"> <Valve className="ch.qos.logback.access.tomcat.LogbackValve" /> </Host> </Engine> </Service> </Server> Running our war like this works. Now I wanted to make Tomcat to use logback as default logging framework as well and integrated ADD logback-core-1.2.3.jar /usr/local/tomcat/lib/ ADD logback-classic-1.2.3.jar /usr/local/tomcat/lib/ ADD logstash-logback-encoder-5.3.jar /usr/local/tomcat/lib/ ADD jackson-databind-2.9.8.jar /usr/local/tomcat/lib/ ADD jul-to-slf4j-1.7.26.jar /usr/local/tomcat/lib/ ADD slf4j-api-1.7.26.jar /usr/local/tomcat/lib/ ADD jackson-core-2.9.8.jar /usr/local/tomcat/lib/ ADD jackson-annotations-2.9.8.jar /usr/local/tomcat/lib/ to the lib folder as well as to the classpath via setenv.sh: export CLASSPATH="$CATALINA_HOME/lib/jul-to-slf4j-1.7.26.jar:$CATALINA_HOME/lib/slf4j-api-1.7.26.jar:$CATALINA_HOME/lib/logback-classic-1.2.3.jar:$CATALINA_HOME/lib/logstash-logback-encoder-5.3.jar:$CATALINA_HOME/lib/jackson-databind-2.9.8.jar:$CATALINA_HOME/lib/jackson-core-2.9.8.jar:$CATALINA_HOME/lib/jackson-annotations-2.9.8.jar:$CATALINA_HOME/lib/logback-access-1.2.3.jar:$CATALINA_HOME/lib/logback-core-1.2.3.jar:$CATALINA_HOME/conf/logback/" I also added a proper logback.xml for Tomcat. Unfortunately in this situation the Tomcat server process is not starting up correctly as the following error occurs: java.lang.NoClassDefFoundError: org/apache/catalina/Lifecycle at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) at java.net.URLClassLoader.access$100(URLClassLoader.java:74) at java.net.URLClassLoader$1.run(URLClassLoader.java:369) at java.net.URLClassLoader$1.run(URLClassLoader.java:363) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:411) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:116) at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1250) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509) at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:182) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1339) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2784) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1518) at org.apache.catalina.startup.Catalina.load(Catalina.java:611) at org.apache.catalina.startup.Catalina.load(Catalina.java:662) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:309) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492) Caused by: java.lang.ClassNotFoundException: org.apache.catalina.Lifecycle at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 35 common frames omitted java.lang.NoClassDefFoundError: org/apache/catalina/Lifecycle at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:468) at java.net.URLClassLoader.access$100(URLClassLoader.java:74) at java.net.URLClassLoader$1.run(URLClassLoader.java:369) at java.net.URLClassLoader$1.run(URLClassLoader.java:363) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:411) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:116) at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1250) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509) at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:182) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1339) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2784) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643) at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1518) at org.apache.catalina.startup.Catalina.load(Catalina.java:611) at org.apache.catalina.startup.Catalina.load(Catalina.java:662) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:309) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492) Caused by: java.lang.ClassNotFoundException: org.apache.catalina.Lifecycle at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 35 more Now if I commend out the line <Valve className="ch.qos.logback.access.tomcat.LogbackValve" /> from the server.xml the startup is running fine and Tomcat logs via logback-classic - but logback-access is not used. I found a question on stackoverflow.com where people seem to have the same problem but no solution is provided: https://stackoverflow.com/questions/32134974/added-logback-to-tomcat-got-jav... Does anyone has a hint for me what is going wrong? Best Simon
