NoSuchMethodError in Bamboo 2.6.1 about javamelody HOT 4 CLOSED

This method (ServletContext#getContextPath) is called by the javamelody plugin 
only if the servlet api version is 2.5 or more. And this issue shows that in 
your setup (bamboo 2.6.1 with jetty), the contract of the servlet api 2.5 was 
broken somehow: the servlet api version reports 2.5 but this method is not 
found.

In fact, I see in my bamboo setup v2.5.5 that there are two servlet api jar 
files in the directory "Bamboo/webapp/WEB-INF/lib". My understanding is that 
servlet api jar files are not needed by the servlet container in "WEB-INF/lib". 
And having two servlet api jar files in "WEB-INF/lib" is perhaps asking for 
trouble in the ordering of classloaders. The following bamboo ticket is also 
related: http://jira.atlassian.com/browse/BAM-5137

So I suggest trying the following:
- stop the bamboo server
- backup and delete the file "Bamboo/webapp/WEB-INF/lib/servlet-api-2.4.jar" 
from your bamboo setup (but keep the servlet-api-2.5.jar)
- restart the bamboo server
- install the javamelody plugin: does it work?

If it is ok, I think we can open a bamboo ticket.

For reference, the javamelody plugin for JIRA/Confluence/Bamboo can be found 
here: https://plugins.atlassian.com/plugin/details/20909

Thanks.  Following your suggestion did the trick.

I have finally created the issue for Bamboo:
http://jira.atlassian.com/browse/BAM-6551

I close this issue as the problem is now in Atlassian hands.

In the meantime, the workaround before installing the javamelody plugin in 
Bamboo 2.6.1 is:
- stop the bamboo server
- backup and delete the file "Bamboo/webapp/WEB-INF/lib/servlet-api-2.4.jar" 
from your bamboo setup (but keep the servlet-api-2.5.jar)
- and restart the bamboo server to install the javamelody plugin