# Error on instrumenting Weblogic Server with APM Agent Client 1.16.0 **URL:** \ **Category:** APM\ **Created:** [June 28, 2020, 7:25am UTC](https://discuss.elastic.co/t/error-on-instrumenting-weblogic-server-with-apm-agent-client-1-16-0/238990 "2020-06-28T07:25:44Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![ParashB](https://avatars.discourse-cdn.com/v4/letter/p/b2d939/32.png) [@ParashB](https://discuss.elastic.co/u/ParashB)\ **Post date:** [June 28, 2020, 7:25am UTC](https://discuss.elastic.co/t/error-on-instrumenting-weblogic-server-with-apm-agent-client-1-16-0/238990/1 "2020-06-28T07:25:44Z")
I am trying to instrument application running on Weblogic 12.2. My APM client jar is 1.16.0.jar. It is able to connect to APM server as I can see the below line in the log 2020-06-27 13:50:11.749 [elastic-apm-server-healthcheck] INFO co.elastic.apm.agent.report.ApmServerHealthCh ecker - Elastic APM server is available: { "build\_date": "2020-05-28T14:42:11Z", "build\_sha": "0102a80acd 2c83e4ab9cce93dc630b877e3063e7", "version": "7.7.1"} After that I am getting the below exception (omitted some stacktraces) : ```auto 2020-06-27 13:50:19.015 [main] INFO co.elastic.apm.agent.bci.bytebuddy.ErrorLoggingListener - com.contrasts ecurity.thirdparty.org.apache.log4j.Category refers to a missing class java.lang.IllegalStateException: Cannot resolve type description for com.contrastsecurity.thirdparty.org.ap ache.log4j.Category at co.elastic.apm.agent.shaded.bytebuddy.pool.TypePool$Resolution$Illegal.resolve(TypePool.java:159 ) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$DescriptionStrategy$Default$2.a pply(AgentBuilder.java:3509) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.do Transform(AgentBuilder.java:10300) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10263) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.ac cess$1600(AgentBuilder.java:10029) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10648) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10595) at java.security.AccessController.doPrivileged(Native Method) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10186) at sun.instrument.TransformerManager.transform(TransformerManager.java:188) at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428) at com.contrastsecurity.agent.i.a.b(Log4jInitializationTask.java:30) at com.contrastsecurity.agent.ContrastAgent.a(ContrastAgent.java:267) at com.contrastsecurity.agent.ContrastAgent.setup(ContrastAgent.java:225) at com.contrastsecurity.agent.ContrastLoaderAgent.premain(ContrastLoaderAgent.java:77) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386) at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401) 2020-06-27 13:50:19.984 [main] INFO co.elastic.apm.agent.bci.bytebuddy.ErrorLoggingListener - com.contrasts ecurity.thirdparty.org.slf4j.ILoggerFactory refers to a missing class java.lang.IllegalStateException: Cannot resolve type description for com.contrastsecurity.thirdparty.org.sl f4j.ILoggerFactory at co.elastic.apm.agent.shaded.bytebuddy.pool.TypePool$Resolution$Illegal.resolve(TypePool.java:159 ) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$DescriptionStrategy$Default$2.a pply(AgentBuilder.java:3509) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.do Transform(AgentBuilder.java:10300) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10263) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.ac cess$1600(AgentBuilder.java:10029) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10648) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10595) at java.security.AccessController.doPrivileged(Native Method) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10186) at sun.instrument.TransformerManager.transform(TransformerManager.java:188) at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.(LoggerFactory.java:75) at com.contrastsecurity.agent.reloadable.ReloadableBeanManager.(ReloadableBeanManager.java: 71) at com.contrastsecurity.agent.reloadable.a.register(ReloadableBean.java:19) at com.contrastsecurity.agent.reloadable.a.(ReloadableBean.java:15) at com.contrastsecurity.agent.config.d.(CachingConfigProvider.java:51) at com.contrastsecurity.agent.config.d.a(CachingConfigProvider.java:153) at com.contrastsecurity.agent.config.h.(Config.java:264) at com.contrastsecurity.agent.config.h.(Config.java:190) at com.contrastsecurity.agent.config.h$a.g(Config.java:186) at com.contrastsecurity.agent.config.h.b(Config.java:280) at com.contrastsecurity.agent.Contrast.(Contrast.java:33) at com.contrastsecurity.agent.i.a.b(Log4jInitializationTask.java:35) at com.contrastsecurity.agent.ContrastAgent.a(ContrastAgent.java:267) at com.contrastsecurity.agent.ContrastAgent.setup(ContrastAgent.java:225) at com.contrastsecurity.agent.ContrastLoaderAgent.premain(ContrastLoaderAgent.java:77) 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:497) at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386) at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401) 2020-06-27 13:50:19.998 [main] INFO co.elastic.apm.agent.bci.bytebuddy.ErrorLoggingListener - com.contrasts ecurity.thirdparty.org.slf4j.spi.LoggerFactoryBinder refers to a missing class java.lang.IllegalStateException: Cannot resolve type description for com.contrastsecurity.thirdparty.org.sl f4j.spi.LoggerFactoryBinder at co.elastic.apm.agent.shaded.bytebuddy.pool.TypePool$Resolution$Illegal.resolve(TypePool.java:159 ) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$DescriptionStrategy$Default$2.a pply(AgentBuilder.java:3509) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.do Transform(AgentBuilder.java:10300) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10263) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.ac cess$1600(AgentBuilder.java:10029) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10648) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10595) at java.security.AccessController.doPrivileged(Native Method) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10186) at sun.instrument.TransformerManager.transform(TransformerManager.java:188) at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.bind(LoggerFactory.java:129) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java :108) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:302 ) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:276) at com.contrastsecurity.thirdparty.org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:288) at com.contrastsecurity.agent.reloadable.ReloadableBeanManager.(ReloadableBeanManager.java: 71) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.do Transform(AgentBuilder.java:10300) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10263) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.ac cess$1600(AgentBuilder.java:10029) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10648) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Le gacyVmDispatcher.run(AgentBuilder.java:10595) at java.security.AccessController.doPrivileged(Native Method) at co.elastic.apm.agent.shaded.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.tr ansform(AgentBuilder.java:10186) at sun.instrument.TransformerManager.transform(TransformerManager.java:188) at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428) at com.contrastsecurity.agent.plugins.rasp.oscommand.a.a(ContrastOSCommandExecutionDispatcherImpl_F actory.java:30) at com.contrastsecurity.agent.plugins.rasp.oscommand.a.get(ContrastOSCommandExecutionDispatcherImpl _Factory.java:1) at com.contrastsecurity.agent.plugins.rasp.oscommand.d.a(OSCommandModule_ProvideOsCommandExecutionD ispatcherFactory.java:29) at com.contrastsecurity.agent.plugins.rasp.oscommand.d.get(OSCommandModule_ProvideOsCommandExecutio nDispatcherFactory.java:1) at com.contrastsecurity.agent.plugins.rasp.l.n(DaggerProtectComponent.java:1464) at com.contrastsecurity.agent.plugins.rasp.RaspPlugin.d(RaspPlugin.java:645) at com.contrastsecurity.agent.plugins.rasp.RaspPlugin.onContrastEngineReady(RaspPlugin.java:589) at com.contrastsecurity.agent.startup.h.a(PluginInitializeTask.java:107) at com.contrastsecurity.agent.ContrastEngine.start(ContrastEngine.java:265) at com.contrastsecurity.agent.ContrastAgent.a(ContrastAgent.java:275) at com.contrastsecurity.agent.ContrastAgent.setup(ContrastAgent.java:225) at com.contrastsecurity.agent.ContrastLoaderAgent.premain(ContrastLoaderAgent.java:77) 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:497) at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386) at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401) [Contrast] Sat Jun 27 13:50:36 GST 2020 Logging security messages to /weblogic/.contrast/security.log [Contrast] Sat Jun 27 13:51:54 GST 2020 Starting JVM [93999ms] ``` Looks like some jar for contrastsecurity package is missing. Please guide on what needs to be added/configured? Am I missing something? ---
**Author:** ![Eyal\_Koren](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/eyal_koren/32/36830_2.png) [@Eyal\_Koren](https://discuss.elastic.co/u/Eyal_Koren)\ **Post date:** [June 28, 2020, 8:46am UTC](https://discuss.elastic.co/t/error-on-instrumenting-weblogic-server-with-apm-agent-client-1-16-0/238990/2 "2020-06-28T08:46:17Z")
Thanks for reporting. This is an `INFO` message, so not necessarily it indicates a real problem, only that our agent fails to instrument the Contrast Security agent, which shouldn't have functional implications. In any case, I added the contrastsecurity package to the exclusion list so that you don't get these. Please try out [this snapshot build](https://apm-ci.elastic.co/job/apm-agent-java/job/apm-agent-java-mbp/job/PR-1257/1/artifact/src/github.com/elastic/apm-agent-java/elastic-apm-agent/target/elastic-apm-agent-1.17.1-SNAPSHOT.jar) and see if everything works as expected. Thanks. ---
**Author:** ![ParashB](https://avatars.discourse-cdn.com/v4/letter/p/b2d939/32.png) [@ParashB](https://discuss.elastic.co/u/ParashB)\ **Post date:** [June 28, 2020, 9:25am UTC](https://discuss.elastic.co/t/error-on-instrumenting-weblogic-server-with-apm-agent-client-1-16-0/238990/3 "2020-06-28T09:25:52Z")
Thanks @Eyal_Koren. Even with the INFO message, the instrumentation works just fine. Thanks for providing the snapshot build, will verify and confirm ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 19, 2020, 5:25am UTC](https://discuss.elastic.co/t/error-on-instrumenting-weblogic-server-with-apm-agent-client-1-16-0/238990/4 "2020-07-19T05:25:55Z")
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