Installation of Hudson Amazon EC2 plugin and entering the required configuration data (Access Key ID, Secret Access Key as well as EC2 RSA Private Key) worked fine. When clicking either on "Test connection" or "Generate key", I receive the following exception:

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.IllegalArgumentException: Unable to convert to class hudson.plugins.ec2.AwsRegion
org.kohsuke.stapler.AnnotationHandler.convert(AnnotationHandler.java:25)
org.kohsuke.stapler.AnnotationHandler$2.parse(AnnotationHandler.java:71)
org.kohsuke.stapler.AnnotationHandler$2.parse(AnnotationHandler.java:59)
org.kohsuke.stapler.AnnotationHandler.handle(AnnotationHandler.java:34)
org.kohsuke.stapler.Function.bindAndInvoke(Function.java:96)
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:54)
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:74)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:519)
org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:318)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:519)
org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:144)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:519)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:435)
org.kohsuke.stapler.Stapler.service(Stapler.java:123)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:51)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:97)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs.