logstash-logback-encoder: WARNINGs/ERRORs output with logback 1.1.7

From @Martin-Wegner…

Running the following config…

    <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
      <providers>
        <timestamp>
          <fieldName>timestamp</fieldName>
        </timestamp>
        <logLevel>
          <fieldName>logLevel</fieldName>
        </logLevel>
        <threadName>
          <fieldName>threadName</fieldName>
        </threadName>
        <loggerName>
          <fieldName>loggerName</fieldName>
        </loggerName>
        <callerData>
          <classFieldName>className</classFieldName>
          <methodFieldName >methodName</methodFieldName>
          <fileFieldName>[ignore]</fileFieldName>
          <lineFieldName>lineNumber</lineFieldName>
        </callerData>
        <message />
        <stackTrace>
          <fieldName>stackTrace</fieldName>
          <throwableConverter class="net.logstash.logback.stacktrace.ShortenedThrowableConverter">
            <exclude>java\..*</exclude>
            <exclude>net\.sf\.cglib\..*</exclude>
            <exclude>org\.springframework\..*</exclude>
            <exclude>sun\..*</exclude>
            <maxDepthPerThrowable>30</maxDepthPerThrowable>
            <rootCauseFirst>true</rootCauseFirst>
          </throwableConverter>
        </stackTrace>
      </providers>
    </encoder>

produces the below errors with logback 1.1.7

Warning: Class 'net.logstash.logback.composite.loggingevent.LogLevelJsonProvider' contains multiple setters for the same property 'fieldNames'.
Warning: Class 'net.logstash.logback.composite.loggingevent.ThreadNameJsonProvider' contains multiple setters for the same property 'fieldNames'.
Warning: Class 'net.logstash.logback.composite.loggingevent.LoggerNameJsonProvider' contains multiple setters for the same property 'fieldNames'.
Warning: Class 'net.logstash.logback.composite.loggingevent.CallerDataJsonProvider' contains multiple setters for the same property 'fieldNames'.
Warning: Class 'net.logstash.logback.composite.loggingevent.MessageJsonProvider' contains multiple setters for the same property 'fieldNames'.
Warning: Class 'net.logstash.logback.composite.loggingevent.StackTraceJsonProvider' contains multiple setters for the same property 'fieldNames'.
20:50:41,230 |-ERROR in ch.qos.logback.core.joran.action.NestedBasicPropertyIA - Unexpected aggregationType AS_BASIC_PROPERTY_COLLECTION
20:50:41,230 |-ERROR in ch.qos.logback.core.joran.action.NestedBasicPropertyIA - Unexpected aggregationType AS_BASIC_PROPERTY_COLLECTION
20:50:41,231 |-ERROR in ch.qos.logback.core.joran.action.NestedBasicPropertyIA - Unexpected aggregationType AS_BASIC_PROPERTY_COLLECTION
20:50:41,231 |-ERROR in ch.qos.logback.core.joran.action.NestedBasicPropertyIA - Unexpected aggregationType AS_BASIC_PROPERTY_COLLECTION

Running the same configuration using logback 1.1.6 does not produce these warnings/errors