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Hazelcast source code can be found at GitHub/Hazelcast. This is also where you can contribute and report issues. 
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Hazelcast API can be found at hazelcast.org/docs/Javadoc. 
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Code samples can be downloaded from hazelcast.org/download. 
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More use cases and resources can be found at hazelcast.com. 
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You can join to the Hazelcast Community group on Slack to post questions, follow the announcements, participate in the discussions and more. 
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You can also use the Hazelcast mail group to post questions and start/follow discussions.