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https://issues.apache.org/jira/browse/NIFI-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15206593#comment-15206593
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Joseph Witt commented on NIFI-1665:
-----------------------------------
This looks to me to be quite important to have in 0.6.0 for kafka users.
> GetKafka continually throws NullPointerException if it ever fails to write
> out message due to Kafka timeout
> -----------------------------------------------------------------------------------------------------------
>
> Key: NIFI-1665
> URL: https://issues.apache.org/jira/browse/NIFI-1665
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Mark Payne
> Assignee: Oleg Zhurakousky
> Priority: Critical
> Fix For: 0.6.0
>
>
> If an Exception is thrown in GetKafka's consumeFromKafka method, it enters
> the following block:
> {code}
> catch (final Exception e) {
> this.shutdownConsumer();
> getLogger().error("Failed to receive FlowFile from Kafka due to
> {}", new Object[]{e});
> if (flowFile != null) {
> session.remove(flowFile);
> }
> {code}
> This call to shutdownConsumer performs the following:
> {code}
> if (this.executor != null) {
> this.executor.shutdown();
> try {
> if (!this.executor.awaitTermination(30000,
> TimeUnit.MILLISECONDS)) {
> this.executor.shutdownNow();
> getLogger().warn("Executor did not stop in 30 sec.
> Terminated.");
> }
> this.executor = null;
> } catch (InterruptedException e) {
> Thread.currentThread().interrupt();
> }
> }
> {code}
> Now that this.executor is set to null, the onTrigger method will continually
> throw NullPointerException because it attempts to call executor.submit:
> {code}
> synchronized (this.consumerStreamsReady) {
> if (!this.consumerStreamsReady.get()) {
> Future<Void> f = this.executor.submit(new Callable<Void>() {
> ...
> {code}
> and also
> {code}
> if (this.consumerStreamsReady.get()) {
> Future<Void> consumptionFuture = this.executor.submit(new
> Callable<Void>() {
> @Override
> public Void call() throws Exception {
> ...
> {code}
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