resteasy-deployer sets the "resteasy.unwrapped.exceptions" context parameter independently on whether the parameter has been in web.xml or not. This results in loss of user's setup.

The code:
ResteasyIntegrationDeployer.setContextParameter(webdata, ResteasyContextParameters.RESTEASY_UNWRAPPED_EXCEPTIONS, "javax.ejb.EJBException");

RESTEasy deployer should check for existence of the context parameter in the servlet context and only set the parameter if it hasn't been specified.