https://community.dynatrace.com/t5/Automations/Simulate-problems-with-EasyTravel-LoadGen/m-p/281859#M2284 <P>Hello,</P> <P>I'm experiencing an issue deploying the EasyTravel environment via Docker on an EC2 instance (Amazon Linux).</P> <P>All services start correctly with docker compose up, and the containers (frontend on ports :80, :8080, and :9079) are accessible. Data is successfully reported to Dynatrace.</P> <P>However, the loadgen container consistently fails to start with the following error:</P> <DIV>Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper</DIV> <DIV><SPAN>at ch.qos.logback.contrib.jackson.JacksonJsonFormatter.&lt;init&gt;(Unknown Source)</SPAN></DIV> <DIV><SPAN>...</SPAN></DIV> <DIV>Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper</DIV> <DIV>&nbsp;</DIV> <P>This is blocking me because it doesn't generate problems. What modification can be made to correct this and simulate problems?</P> Mon, 15 Dec 2025 10:51:43 GMT wdi 2025-12-15T10:51:43Z https://community.dynatrace.com/t5/Automations/Simulate-problems-with-EasyTravel-LoadGen/m-p/281859#M2284 <P>Hello,</P> <P>I'm experiencing an issue deploying the EasyTravel environment via Docker on an EC2 instance (Amazon Linux).</P> <P>All services start correctly with docker compose up, and the containers (frontend on ports :80, :8080, and :9079) are accessible. Data is successfully reported to Dynatrace.</P> <P>However, the loadgen container consistently fails to start with the following error:</P> <DIV>Exception in thread "main" java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper</DIV> <DIV><SPAN>at ch.qos.logback.contrib.jackson.JacksonJsonFormatter.&lt;init&gt;(Unknown Source)</SPAN></DIV> <DIV><SPAN>...</SPAN></DIV> <DIV>Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper</DIV> <DIV>&nbsp;</DIV> <P>This is blocking me because it doesn't generate problems. What modification can be made to correct this and simulate problems?</P> Mon, 15 Dec 2025 10:51:43 GMT https://community.dynatrace.com/t5/Automations/Simulate-problems-with-EasyTravel-LoadGen/m-p/281859#M2284 wdi 2025-12-15T10:51:43Z https://community.dynatrace.com/t5/Automations/Simulate-problems-with-EasyTravel-LoadGen/m-p/291472#M2451 <P>Hi&nbsp;<a href="https://community.dynatrace.com/t5/user/viewprofilepage/user-id/67014">@wdi</a>&nbsp;,</P> <DIV>I just wanted to check in and see if you still need help with this. If so, I’d be happy to look into it for you! <span class="lia-unicode-emoji" title=":smiling_face_with_smiling_eyes:">😊</span><BR />Please let me know what works best for you.</DIV> Mon, 15 Dec 2025 10:51:58 GMT https://community.dynatrace.com/t5/Automations/Simulate-problems-with-EasyTravel-LoadGen/m-p/291472#M2451 IzabelaRokita 2025-12-15T10:51:58Z