# Ealstic-apm-agent failed with tomcat

**URL:** <https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808>\
**Category:** APM\
**Created:** [September 24, 2020, 12:09pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808 "2020-09-24T12:09:29Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![qiratnahraf](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/qiratnahraf/32/55984_2.png) [@qiratnahraf](https://discuss.elastic.co/u/qiratnahraf)\
**Post date:** [September 24, 2020, 12:09pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/1 "2020-09-24T12:09:29Z")

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Hi, We are trying to test elastic APM and trying to attach "elastic-apm-agent-1.18.0.jar" with our tomcat and for this we follow guide to export CATALINA\_OPTS in setenv.sh file. but when we start tomcat we hit with following error  
"Exception in thread "Main Thread" java.lang.UnsupportedClassVersionError: co/elastic/apm/agent/bci/AgentMain : unsupported classversion 51.0  
at java.lang.ClassLoader.defineClass1(Native Method)  
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)  
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)  
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)  
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)  
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)  
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)  
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)  
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)  
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)  
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)  
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:280)  
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:338)  
FATAL ERROR in native method: processing of -javaagent failed  
[ERROR] aborted  
JRockit aborted: Unknown error (50)"

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**Author:** ![Wolfram\_Haussig](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/wolfram_haussig/32/70528_2.png) [@Wolfram\_Haussig](https://discuss.elastic.co/u/Wolfram_Haussig)\
**Post date:** [September 25, 2020, 10:40am UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/2 "2020-09-25T10:40:39Z")

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Hi,

On which java version are you running? class version 51 is Java 7 which should be supported by APM according to the docs.

Best regards  
Wolfram

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**Author:** ![qiratnahraf](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/qiratnahraf/32/55984_2.png) [@qiratnahraf](https://discuss.elastic.co/u/qiratnahraf)\
**Post date:** [September 25, 2020, 3:21pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/3 "2020-09-25T15:21:45Z")

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Hi, we are on java 6.

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**Author:** ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb)\
**Post date:** [September 27, 2020, 4:02am UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/4 "2020-09-27T04:02:38Z")

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I don't think Java 6 is Supported

See here

> **[Supported technologies | APM Java Agent Reference \[1.x\] | Elastic](https://www.elastic.co/guide/en/apm/agent/java/current/supported-technologies-details.html#supported-java-versions)**

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<div class="post-metadata">

**Author:** ![qiratnahraf](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/qiratnahraf/32/55984_2.png) [@qiratnahraf](https://discuss.elastic.co/u/qiratnahraf)\
**Post date:** [September 27, 2020, 4:36pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/5 "2020-09-27T16:36:12Z")

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Yes, that's what the reason. Sorry for bothering you people, actually I was not sure about the version at first.  
Thanks for support.

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**Author:** ![pathfinder225](https://avatars.discourse-cdn.com/v4/letter/p/bbe5ce/32.png) [@pathfinder225](https://discuss.elastic.co/u/pathfinder225)\
**Post date:** [October 8, 2020, 5:07pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/6 "2020-10-08T17:07:10Z")

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any alternatives for java 6 version.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 29, 2020, 1:07pm UTC](https://discuss.elastic.co/t/ealstic-apm-agent-failed-with-tomcat/249808/7 "2020-10-29T13:07:14Z")

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