java.lang.IllegalArgumentException: Multiple entries with same key: ActionKey{namespace=/console/secure/plugins/crowd-sso, name=null}

drilling a bit further down the code i come to believe, that there is a bug in com.atlassian.crowd.plugin.descriptors.webwork.PluginAwareActionConfig.build:

public static PluginAwareActionConfig build(String methodName, String className, Map<String, String> parameters,
                                                Map<String, ResultConfig> results, List<InterceptorMapping> interceptors,
                                                List<? extends ExceptionMappingConfig> exceptionMappings, String packageName, List<String> allowedMethods) {
        ActionConfig base = new ActionConfig.Builder(packageName, null, className)
                .methodName(methodName)
                .addParams(parameters)
                .addResultConfigs(results)
                .addInterceptors(interceptors)
                .addExceptionMappings(exceptionMappings)
                .addAllowedMethod(allowedMethods)
                .build();
        return new PluginAwareActionConfig(base);
    }

the line

ActionConfig base = new ActionConfig.Builder(packageName, null, className)

sets the (action-)name to null and ignores the name configured in the atlassian-plugin.xml. thatswhy every action in the same package gets the same key in com.atlassian.crowd.plugin.descriptors.webwork.PluginAwareConfigurationDecorator.