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Handler processing failed; nested exception is java.lang.AbstractMethodError:

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Hi ,

I am getting following error when i am trying to deploy an application on Websphere Application Server Liberty.

Can any one please help me with this error and how it can be resolved.
Same application was running fine on Tomcat and then i decided to use Websphere Application Server Liberty. For this i created a new workspace in eclipse and then imported same folder structure of application from my old workspace to new workspace. In my old workspace the application was running on Tomcat. In new workspace i configured new target runtime to get  Websphere Application Server Liberty. I added few external jars like jsp-api.jar and servlet-api.jar and slf4j-log4j12-1.7.21.jar. Then i started the WAS Liberty server ran the application and was able to get application login page. But as soon as i entered login and password, i got the above error.  Please help

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I wonder if it may relate to classloader order conflict.
Try to play "parent first" v.s. "parent last" setting for classloaders.
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