Github user markap14 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2458#discussion_r167240898
  
    --- Diff: 
nifi-nar-bundles/nifi-jms-bundle/nifi-jms-processors/src/main/java/org/apache/nifi/jms/processors/PublishJMS.java
 ---
    @@ -131,4 +143,10 @@ protected JMSPublisher 
finishBuildingJmsWorker(CachingConnectionFactory connecti
             session.read(flowFile, in -> StreamUtils.fillBuffer(in, 
messageContent, true));
             return messageContent;
         }
    +
    +    private String extractTextMessageBody(FlowFile flowFile, 
ProcessSession session) {
    +        final StringWriter writer = new StringWriter();
    +        session.read(flowFile, in -> IOUtils.copy(in, writer, 
Charset.defaultCharset()));
    --- End diff --
    
    We probably want to expose the character set as a property. At a minimum, 
we should be explicit in defining which character set would be used (UTF-8 
perhaps) instead of relying on the default charset, as this would produce 
different results from environment to environment.


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