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How to Use Java 8 Streams to Swiftly Replace Elements in a List

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Imagine you have a list of items: List<String> books = Arrays.asList( "The Holy Cow: The Bovine Testament", "True Hip Hop", "Truth and Existence", "The Big Book of Green Design" ); (Don’t judge me. Books from this random book generator) Now you’d like to create a new list where the third item only is replaced by some new value: List<String> books ...

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Get into Docker

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Have you ever heard about Docker before? Most likely. If not, don’t worry, I’ll try to summarize it for you. Docker is probably one of the hottest technologies at the moment. It has the potential to revolutionize the way we build, deploy and distribute applications. At the same time, it’s already having a huge impact in the development process. In ...

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SELECT statements batch fetching with JDBC and Hibernate

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Introduction Now that I covered Hibernate batch support for INSERT, UPDATE and DELETE statements, it’s time to analyze SELECT statements result set batch fetching. JDBC ResultSet fetching The JDBC ResultSet offers a client-side Proxy cursor for fetching the current statement return data. When the statement gets executed, the result must be transferred from the database cursor to the client-side one. ...

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OptaPlanner – How fast is logging?

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What’s the cost of trace/debug logging in production? What’s the performance cost of logging to a file? In these benchmarks, I compare the performance impact of logging levels (error, warn, info, debug, trace) and logging appenders (console appender, file appender) on several realistic OptaPlanner use cases. Benchmark methodology       Logging implementation: SFL4J 1.7.2 with Logback 1.0.9 (Logback is ...

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Apache Mesos + Marathon and Java EE

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Apache Mesos is an open-source cluster manager that provides efficient resource isolation and sharing across distributed applications or frameworks. Apache Mesos abstracts CPU, memory, storage, and other compute resources away from machines (physical or virtual), enabling fault-tolerant and elastic distributed systems to easily be built and run effectively. It uses dynamic allocation of applications inside machines. In summary Apache Mesos ...

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JavaOne Cloud, DevOps, Containers, Microservices etc. Track

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Every year, for the past 19 years, JavaOne is the biggest and most awesome gathering of Java enthusiasts from around the world. JavaOne 2015 is the 20th edition of this wonderful conference. How many conferences can claim this? :) Would you like to be part of JavaOne 2015? Sure, you can get notified when the registration opens and attend the conference. Why not take it a ...

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