Microsoft announced its acquisition of Java specialist jClarity on August 19, 2019, saying the team would help improve Java workload performance on Azure while continuing its open-source work with the OpenJDK community. The announcement disclosed no purchase price or other financial terms.
Why did Microsoft acquire jClarity?
Microsoft framed the acquisition around two goals: bringing data-driven Java Virtual Machine (JVM) optimization expertise into its Azure work and supporting jClarity’s ongoing open-source contributions. John Montgomery, then Microsoft’s Corporate Vice President, Azure AI, said the teams would work together to improve the Azure experience and performance for Java developers and end users. That statement described Microsoft’s aims at the time; it did not quantify results.
Microsoft described jClarity’s team as Java specialists with experience optimizing customer applications and leadership in the Java open-source community. The company said the team would help it apply advances in the Java platform and continue collaborating with the OpenJDK community. The announcement did not provide a jClarity-specific performance benchmark.
What did jClarity have to do with AdoptOpenJDK?
Microsoft identified jClarity as a leading contributor to AdoptOpenJDK, an open-source project. The acquisition was not the start of Microsoft’s involvement: its 2019 announcement said Microsoft had sponsored AdoptOpenJDK since June 2018. That earlier sponsorship date is separate from the acquisition announcement on August 19, 2019.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →As context for its Java investment, Microsoft’s 2019 announcement said more than half of Azure compute workloads were running on Linux. It also cited Azure HDInsight and Minecraft as large-scale Java deployments and named Adobe, Daimler, and Société Générale as customers with Java production workloads on Azure. These were examples in Microsoft’s announcement at the time, not a current customer list.
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What did Microsoft say about the work afterward?
A later Microsoft overview, “How Microsoft Applies Java”, says that after the 2019 acquisition Microsoft began a dedicated effort to optimize its internal Java workloads and contribute learnings to OpenJDK. It reports more than 2 million JVMs in production on Microsoft internal systems. The PDF does not state a publication date, and the figure describes Microsoft’s reported internal scale; it does not establish that jClarity alone caused that scale or any particular performance improvement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When was the deal announced, and were its terms disclosed?
Microsoft announced the acquisition on August 19, 2019, and its investor-relations acquisition history lists jClarity on that date. The official announcement reviewed did not state a purchase price or other financial terms. Contemporary TechCrunch coverage likewise reported that the companies did not discuss the terms.
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