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

    https://github.com/apache/nifi/pull/295#discussion_r57103757
  
    --- Diff: 
nifi-nar-bundles/nifi-kafka-bundle/nifi-kafka-processors/src/main/java/org/apache/nifi/processors/kafka/PutKafka.java
 ---
    @@ -371,11 +371,12 @@ private FlowFile cleanUpFlowFileIfNecessary(FlowFile 
flowFile, ProcessSession se
         /**
          *
          */
    -   private Object determinePartition(SplittableMessageContext 
messageContext, ProcessContext context, FlowFile flowFile) {
    +    private Integer determinePartition(SplittableMessageContext 
messageContext, ProcessContext context,
    +            FlowFile flowFile) {
            String partitionStrategy = 
context.getProperty(PARTITION_STRATEGY).getValue();
    -       String partitionValue = null;
    +        Integer partitionValue = null;
            if 
(partitionStrategy.equalsIgnoreCase(USER_DEFINED_PARTITIONING.getValue())) {
    -           partitionValue = 
context.getProperty(PARTITION).evaluateAttributeExpressions(flowFile).getValue();
    +            partitionValue = 
Integer.parseInt(context.getProperty(PARTITION).evaluateAttributeExpressions(flowFile).getValue());
    --- End diff --
    
    Agrred and done, will wait for your morning once-over and will make one 
last push


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