# java.lang.NoClassDefFoundError: javax/servlet/ServletContext APM agent 1.29.0 in Docker **URL:** \ **Category:** APM\ **Tags:** docker, java\ **Created:** [March 7, 2022, 2:24pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975 "2022-03-07T14:24:43Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![jseletz](https://avatars.discourse-cdn.com/v4/letter/j/a88e57/32.png) [@jseletz](https://discuss.elastic.co/u/jseletz)\ **Post date:** [March 7, 2022, 2:24pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/1 "2022-03-07T14:24:43Z")
I am running Tomcat 9.0.52 in K8s from the Docker tomcat:9.0.52-jdk11-corretto image. I've downloaded the agent from [https://repo1.maven.org/maven2/co/elastic/apm/elastic-apm-agent/1.29.0/elastic-apm-agent-1.29.0.jar](https://repo1.maven.org/maven2/co/elastic/apm/elastic-apm-agent/1.29.0/elastic-apm-agent-1.29.0.jar) and added the following CATALINA\_OPTS env variable: ```auto -javaagent:/usr/local/tomcat/elastic-apm-agent-1.29.0.jar -Delastic.apm.service_name=myapp -Delastic.apm.application_packages=com.myco -Delastic.apm.server_url=http://apm-server-apm-server.default.svc.cluster.local:8200 -Delastic.apm.environment=mynamespace ``` All applications running with this image have the following in their tomcat log at startup: ```auto java.lang.NoClassDefFoundError: javax/servlet/ServletContext at co.elastic.apm.agent.servlet.adapter.JavaxServletApiAdapter.getServletContextName(JavaxServletApiAdapter.java:42) at co.elastic.apm.agent.servlet.ServletServiceNameHelper.detectServiceInfo(ServletServiceNameHelper.java:58) at co.elastic.apm.agent.springwebmvc.SpringServiceNameInstrumentation$SpringServiceNameAdvice.afterInitPropertySources(SpringServiceNameInstrumentation.java:90) at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.initPropertySources(AbstractRefreshableWebApplicationContext.java:214) at org.springframework.context.support.AbstractApplicationContext.prepareRefresh(AbstractApplicationContext.java:634) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:702) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:668) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:716) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:591) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:530) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:170) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1143) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1096) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:989) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5264) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:698) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1024) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:825) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:475) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1618) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423) at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:946) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:835) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1396) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1386) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:919) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:263) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:432) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:927) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:772) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:345) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:476) Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext at co.elastic.apm.agent.premain.ShadedClassLoader.findClass(ShadedClassLoader.java:77) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ... 50 more ``` This doesn't seem to affect the application or the APM agent, not sure if this is a real issue or if something is misconfigured? ---
**Author:** ![Sylvain\_Juge](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sylvain_juge/32/55521_2.png) [@Sylvain\_Juge](https://discuss.elastic.co/u/Sylvain_Juge)\ **Post date:** [March 8, 2022, 11:15am UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/2 "2022-03-08T11:15:07Z")
Hi @jseletz , thanks for reporting this. I have managed to reproduce it, thus I will open an issue and investigate it further, I'll update this discussion when I have links to issue/PR to share. In the mean time, you can disable the instrumentation that triggers it by setting `disable_instrumentations=spring-service-name` ([doc](https://www.elastic.co/guide/en/apm/agent/java/current/config-core.html#config-disable-instrumentations)). The downside of this issue is that the agent won't be able to automatically use the application name set in Spring configuration and you will have to add an explicit `service_name` configuration for your application. ---
**Author:** ![Sylvain\_Juge](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sylvain_juge/32/55521_2.png) [@Sylvain\_Juge](https://discuss.elastic.co/u/Sylvain_Juge)\ **Post date:** [March 12, 2022, 1:51pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/3 "2022-03-12T13:51:07Z")
Hi @jseletz , the issue should be fixed with [this PR](https://github.com/elastic/apm-agent-java/pull/2509). In order to make sure it now works as expected in your application, could you try with [this snapshot](https://apm-ci.elastic.co/job/apm-agent-java/job/apm-agent-java-mbp/job/PR-2509/1/artifact/src/github.com/elastic/apm-agent-java/elastic-apm-agent/target/elastic-apm-agent-1.29.1-SNAPSHOT.jar) and tell us if it works as expected in your case ? ---
**Author:** ![jonahzirkle](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@jonahzirkle](https://discuss.elastic.co/u/jonahzirkle)\ **Post date:** [March 14, 2022, 2:14pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/4 "2022-03-14T14:14:42Z")
Hi Sylvain, we have an application running in pivotal cloud foundry with the same issue. I've opened a support case to get visibility on this. Can you please discuss what exactly is set using spring-service-name? Is this what is set in service.name or something specific to spring? Can you share in the ECS or APM data where/how this field is used and stored? I need to understand the impact. And you state to add explicit service\_name so I'd like to understand how that is accomplished as well. Thank you! ---
**Author:** ![jseletz](https://avatars.discourse-cdn.com/v4/letter/j/a88e57/32.png) [@jseletz](https://discuss.elastic.co/u/jseletz)\ **Post date:** [March 14, 2022, 2:27pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/5 "2022-03-14T14:27:11Z")
Hi - your workaround is fine as we already needed to set the service\_name. I don't have an easy way to test with your patch since we've deployed all our apps with your suggested configuration. ---
**Author:** ![Sylvain\_Juge](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sylvain_juge/32/55521_2.png) [@Sylvain\_Juge](https://discuss.elastic.co/u/Sylvain_Juge)\ **Post date:** [March 14, 2022, 2:34pm UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/6 "2022-03-14T14:34:10Z")
Thanks for the confirmation @jseletz , the PR has been approved and will be merged soon (and included in the next release, if you haven't already make sure to subscribe to release notifications). @jonahzirkle : the instrumentation of spring context startup allows the agent to automatically set the `service_name` configuration from the `spring.application.name` property in Spring context. Until the next release is available you should be able to use the [work-around](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/2). Once the 1.30.0 version is available the work-around won't be necessary. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 4, 2022, 10:35am UTC](https://discuss.elastic.co/t/java-lang-noclassdeffounderror-javax-servlet-servletcontext-apm-agent-1-29-0-in-docker/298975/7 "2022-04-04T10:35:01Z")
This topic was automatically closed 20 days after the last reply. New replies are no longer allowed.