Complicated failure-descriptions in Elytron simple-permission-mapper

There are complicated failure-descriptions in Elytron simple-permission-mapper. They include some details from exceptions which are not needed and can be confused for non-java administrators. Please handle these exceptions and provide some user friendly failure-description.

Examples of complicated failure-description in simple-permission-mapper:

• Wrong name of permission class:

  /subsystem=elytron/simple-permission-mapper=mapper:add(permission-mappings=[{permissions=[{action=read,class-name=org.wildfly.security.auth.permission.WrongLoginPermission,target-name=someName}]}])
  {
      "outcome" => "failed",
      "failure-description" => {
          "WFLYCTL0080: Failed services" => {"org.wildfly.security.permission-mapper.mapper" => "org.jboss.msc.service.StartException in service org.wildfly.security.permission-mapper.mapper: WFLYELY00021: Exception while creating the permission object for the permission mapping. Please check [class-name], [target-name] (name of permission) and [action] of [org.wildfly.security.auth.permission.WrongLoginPermission].
      Caused by: org.wildfly.security.permission.InvalidPermissionClassException: ELY03015: Could not load permission class \"org.wildfly.security.auth.permission.WrongLoginPermission\"
      Caused by: java.lang.ClassNotFoundException: org.wildfly.security.auth.permission.WrongLoginPermission from [Module \"org.wildfly.extension.elytron:main\" from local module loader @5479e3f (finder: local module finder @27082746 (roots: /home/olukas/workspace/uxcli/jboss-eap-7.1/modules,/home/olukas/workspace/uxcli/jboss-eap-7.1/modules/system/layers/base))]"},
          "WFLYCTL0412: Required services that are not installed:" => ["org.wildfly.security.permission-mapper.mapper"],
          "WFLYCTL0180: Services with missing/unavailable dependencies" => undefined
      },
      "rolled-back" => true
  }
  

• Adding permission, but non existing module is used:

  /subsystem=elytron/simple-permission-mapper=mapper:add(permission-mappings=[{permissions=[{action=read,class-name=org.wildfly.security.auth.permission.LoginPermission,target-name=someName,module=some.nonexist.module}]}])
  {
      "outcome" => "failed",
      "failure-description" => {
          "WFLYCTL0080: Failed services" => {"org.wildfly.security.permission-mapper.mapper" => "org.jboss.msc.service.StartException in service org.wildfly.security.permission-mapper.mapper: org.jboss.modules.ModuleNotFoundException: some.nonexist.module:main
      Caused by: org.jboss.modules.ModuleNotFoundException: some.nonexist.module:main"},
          "WFLYCTL0412: Required services that are not installed:" => ["org.wildfly.security.permission-mapper.mapper"],
          "WFLYCTL0180: Services with missing/unavailable dependencies" => undefined
      },
      "rolled-back" => true
  }
  

Suggestion for improvement:

• use only description of failure, e.g. something like "module a.b.c. does not exist"
• do not use any unneeded information - e.g. "WFLYCTL0180: Services with missing/unavailable dependencies" => undefined