Facing the Challenges of Microservice Development in the Cloud

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1 Facing the Challenges of Microservice Development in the Cloud Sebastian Daschner Lead Java Developer Advocate

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2 Sebastian Daschner • Lead Java Developer Advocate @ IBM • Consultant, trainer, book author • JCP Expert Group member & Jakarta EE Committer • Java Champion • Oracle Developer Champion (Alumni) • JavaOne Rockstar speaker

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3 3 Cloud-native microservices Why should we care?

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4 Java Enterprise today ● Still widely used in enterprises ● Known APIs & great developer experience ● Missing parts in a cloud-native, microservice world

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5 Java Enterprise: What’s missing ● Resiliency ● Monitoring ● Distributed tracing ● Injectable configuration

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6 6 MicroProfile An alternative?

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7 MicroProfile: An alternative? ● Java Enterprise developer experience ● Addresses missing parts ● Enough for more complex applications?

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8 MicroProfile: What’s missing ● Persistence, JPA, JTA ● Concurrency Utils ● EJB (Timers, Asynchronous)

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9 Java Enterprise: Options ● Java EE 8 / Jakarta EE only ● MicroProfile 2.0 only ● Java EE plus MicroProfile additions

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10 Java EE plus MicroProfile ● Proven technology, known APIs ● MicroProfile projects fills the gaps ● E.g. Java EE plus MP Config, Fault Tolerance, Metrics, OpenTracing

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11 11 Example: Enterprise coffee

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12 What else is missing? ● Observability (technical, infrastructure) ● Service discovery ● Traffic routing

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13 13 Kubernetes & Istio Let’s go cloud native

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14 Customizing the runtime ● Only including the required standards & runtime features ● Required? ● Trade-off between time & material spent on either development or runtime ● Optimize the moving parts (deployment artifacts) first

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15 Servers supporting MicroProfile ● Open Liberty 18.0.0.3 ● Payara 5.184 ● Tom EE 8.0 ● Wildfly 14.0.1.Final

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16 Key takeaways ● Use known APIs ● Think of MicroProfile as extensions for Java EE ● Development model that fits your need on application side ● Optimize deployment artifacts before runtime

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17 Future: MicroProfile as Incubator? ● Crafting vendor-independent soon-to-be standards ● Providing what's missing from future Jakarta EE ● Sharing design principles with Jakarta EE ● Defining a reasonable process

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18 18 Cloud native Java What about startup times & resource consumption?

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19 19 Eclipse OpenJ9 An alternative runtime?

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20 OpenJ9 ● OSS under Eclipse Foundation ● Performance optimizations (Start-up time, ramp-up, footprint) ● Free usage & security updates ● Commercial support (optional)

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21 Thank You For Your Attention! ● sebastian-daschner.com ● @DaschnerS ● Book: Architecting Modern Java EE Applications ● https://github.com/sdaschner/coffee/tree/microservice-cloud- webinar