# Apache Karaf and APM agent **URL:** \ **Category:** APM\ **Tags:** java\ **Created:** [November 2, 2020, 10:33am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012 "2020-11-02T10:33:18Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Daniele\_Uboldi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/daniele_uboldi/32/78263_2.png) [@Daniele\_Uboldi](https://discuss.elastic.co/u/Daniele_Uboldi)\ **Post date:** [November 2, 2020, 10:33am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/1 "2020-11-02T10:33:18Z")
**Kibana version** : 7.3.1 **Elasticsearch version** : 7.3.1 **APM Server version** : 7.9.3 **APM Agent language and version** : Java 1.18.1 **Browser version** : Chrome 86.0.4240.111 **Original install method (e.g. download page, yum, deb, from source, etc.) and version**: from source (Windows) **Fresh install or upgraded from other version?** Docker compose for the stack, fresh install for APM Server **Is there anything special in your setup?** No special configuration. All the stack is build with a docker-compose, except for APM. **Description of the problem including expected versus actual behavior. Please include screenshots (if relevant)**: Hi everybody! I'm trying to monitor the apache karaf container used under Talend Open Studio for ESB (v 7.2.1). I've configured the APM server in the right way and it is reacheable by Kibana, nevertheless I've some problems configuring the APM agent, in particular, attaching it to the .jar process of the karaf. I've tried both with the main karaf jar file (org.apache.karaf.main-4.2.4) located under /container/lib/boot/ folder and with the wrapper installed within the karaf itself, which .jar file is located under /container/lib/wrapper (karaf-wrapper). Is there a way to configure the agent correctly? I'm always getting the same error reported below: ```auto 1 PS C:\talend\TOS_ESB-20190620_1446-V7.2.1\Runtime_ESBSE\container\lib\wrapper> java -javaagent:C:\Users\daniele.uboldi\Downloads\jar\agents\elk\elastic-apm-agent-1.18.1.jar -Delastic.apm.service_name=Main -Delastic.apm.server_url=http://localhost:8020 -Delastic.apm.secret_token= -Delastic.apm.application_packages=org.apache.karaf.wrapper -jar karaf-wrapper-main.jar 2 2020-11-02 11:18:27,899 [main] INFO co.elastic.apm.agent.util.JmxUtils - Found JVM-specific OperatingSystemMXBean interface: com.sun.management.OperatingSystemMXBean 3 2020-11-02 11:18:27,910 [main] INFO co.elastic.apm.agent.configuration.StartupInfo - Starting Elastic APM 1.18.1 as karaf-wrapper-main on Java 1.8.0_251 Runtime version: 1.8.0_251-b08 VM version: 25.251-b08 (Oracle Corporation) Windows 10 10.0 4 2020-11-02 11:18:27,915 [main] WARN co.elastic.apm.agent.configuration.StartupInfo - To enable all features and decrease startup time, please configure application_packages 5 2020-11-02 11:18:29,848 [elastic-apm-server-healthcheck] INFO co.elastic.apm.agent.report.ApmServerHealthChecker - Elastic APM server is available: { "build_date": "2020-10-16T08:02:43Z", "build_sha": "af7b123f289d79c34c9da11471803f457eafa5c0", "version": "7.9.3"} 6 2020-11-02 11:18:30,033 [main] INFO co.elastic.apm.agent.impl.ElasticApmTracer - Tracer switched to RUNNING state 7 Errore: impossibile trovare o caricare la classe principale .apm.service_name=Main 8 2020-11-02 11:18:30,053 [elastic-apm-init-instrumentation-shutdown-hook] INFO co.elastic.apm.agent.impl.ElasticApmTracer - Tracer switched to STOPPED state ``` For those who are not italian, line 7 is: ```auto Error: unable to find or load the main class .apm.service-name=Main ``` Can anyone give me some help? ---
**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:** [November 3, 2020, 8:10am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/2 "2020-11-03T08:10:46Z")
Hi @Daniele_Uboldi, welcome to our forum ! I have no experience with running Karaf, but it seems that your agent parameters are somehow truncated, as the agent do not get the value of the `application_packages` parameter. Could you try to store parameters in a `elasticapm.properties` in the same folder as `elastic-apm-agent-1.18.1.jar` ? With that you will be able to remove all parameters but the `-javaagent` one. ---
**Author:** ![Daniele\_Uboldi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/daniele_uboldi/32/78263_2.png) [@Daniele\_Uboldi](https://discuss.elastic.co/u/Daniele_Uboldi)\ **Post date:** [November 3, 2020, 8:18am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/3 "2020-11-03T08:18:07Z")
Hi @Sylvain_Juge, thank you for your welcome and the reply! Is there any guide on how to configure the parameters in the file? Is it simply a configuration file like the SpringBoot ones? Thank you in advance! ---
**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:** [November 3, 2020, 8:43am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/4 "2020-11-03T08:43:46Z")
There are quite a few ways to configure the agent, I suggest you to have a look at our official documentation [available here](https://www.elastic.co/guide/en/apm/agent/java/current/configuration.html). Yes, it's a similar file as the ones used to configure spring-boot, but we do not support YAML format, only the regular java properties format. Also, please note that when using this properties files, you need to remove the `elastic.apm.` prefix to properties that are stored in the file. This prefix is required only for JVM command line to avoid any conflicts. ---
**Author:** ![Daniele\_Uboldi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/daniele_uboldi/32/78263_2.png) [@Daniele\_Uboldi](https://discuss.elastic.co/u/Daniele_Uboldi)\ **Post date:** [November 3, 2020, 8:49am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/5 "2020-11-03T08:49:32Z")
Thank you @Sylvain_Juge! I've tried and now I'm getting a completely different error that is reported below: PS C:\talend\TOS\_ESB-20190620\_1446-V7.2.1\Runtime\_ESBSE\container\lib\boot\> java -javaagent:C:\Users\daniele.uboldi\Downloads\jar\agents\elk\elastic-apm-agent-1.18.1.jar -jar org.apache.karaf.main-4.2.4.jar ```auto 2020-11-03 09:58:30,118 [main] INFO co.elastic.apm.agent.util.JmxUtils - Found JVM-specific OperatingSystemMXBean interface: com.sun.management.OperatingSystemMXBean 2020-11-03 09:58:30,130 [main] INFO co.elastic.apm.agent.configuration.StartupInfo - Starting Elastic APM 1.18.1 as karaf-monitoring on Java 1.8.0_251 Runtime version: 1.8.0_251-b08 VM version: 25.251-b08 (Oracle Corporation) Windows 10 10.0 2020-11-03 09:58:32,241 [main] INFO co.elastic.apm.agent.impl.ElasticApmTracer - Tracer switched to RUNNING state Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: org/osgi/framework/BundleException at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Unknown Source) at java.lang.Class.privateGetMethodRecursive(Unknown Source) at java.lang.Class.getMethod0(Unknown Source) at java.lang.Class.getMethod(Unknown Source) at sun.launcher.LauncherHelper.validateMainClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.osgi.framework.BundleException at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 7 more 2020-11-03 09:58:32,268 [elastic-apm-init-instrumentation-shutdown-hook] INFO co.elastic.apm.agent.impl.ElasticApmTracer - Tracer switched to STOPPED state ``` I was also thinking about your previous answer, is it possible that the agent does not get the application.packages parameters from the command line because the previous parameter (agent.token) is empty? ---
**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:** [November 3, 2020, 9:42am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/6 "2020-11-03T09:42:03Z")
This second error message is related to OSGI, which is different from regular applications classloading. When looking at past forum posts & agent issues, I've found this : [https://github.com/elastic/apm-agent-java/issues/436](https://github.com/elastic/apm-agent-java/issues/436). Could you try to set the `boot_delegation_packages` configuration option as described in the issue ? ---
**Author:** ![Daniele\_Uboldi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/daniele_uboldi/32/78263_2.png) [@Daniele\_Uboldi](https://discuss.elastic.co/u/Daniele_Uboldi)\ **Post date:** [November 4, 2020, 8:02am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/7 "2020-11-04T08:02:50Z")
I've added the `boot_delegation_packages` to the elasticapm.properties file, as mentioned in one of the last comments by eyalkoren, but with no results, the error is still appearing to me. My elasticapm.properties file look like this now: ```auto service_name=karaf-monitoring application_packages=org.apache.karaf server_urls=http://localhost:8020 boot_delegation_packages=org.apache.karaf.jaas.boot,org.apache.karaf.jaas.boot.principal,org.apache.karaf.management.boot,sun.*,com.sun.*,javax.transaction,javax.transaction.*,javax.xml.crypto,javax.xml.crypto.*,org.apache.xerces.jaxp.datatype,org.apache.xerces.stax,org.apache.xerces.parsers,org.apache.xerces.jaxp,org.apache.xerces.jaxp.validation,org.apache.xerces.dom,co.elastic.apm.agent.* ``` Do you have any other options to try? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 25, 2020, 4:02am UTC](https://discuss.elastic.co/t/apache-karaf-and-apm-agent/254012/8 "2020-11-25T04:02:57Z")
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