Tag Archives: stream

Java 8 streams and JTA chunking?


Java 8 streams are very expressive – even if RxJava is even more 😉 – but sometimes EE integration is not that advanced. In case of a batch import of data it would be handy to use Stream API since we iterate over data to persist them but how to ensure we can use chunking – ie get a commit interval to not commit for each record?

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JPA + Java8 Stream = paginated findAll()


For batch tasks it is quite common to need to browse a full table. Depending the table it can be done in memory without thinking much or it can be too big and needs pagination.

A common solution was to use a kind of PageResult object which was representing the current page and its index and let the client/caller iterating over PageResults.

With java 8 streams the API can be more concise and efficient.

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Json API (JavaEE 7) + Java 8: collection to JsonArray


JavaEE 7 brings an API for JSON arrays (the surprising JsonArray ;)), Java 8 brings a stream API and lambdas so now you can combine both to create a JsonArray from a Collection!

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