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Graal
GraalVM compiles Java applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Adding to this ...You can use java, even effectively, to implement lambdas if you use GraalVM (https://www.graalvm.org/), but that may be more than you are willing to implement. I once worked for a company that wanted to 'do serverless' and ended up calling a lambda 2 billion (yes billion) times a day. Obviously, a small set of EC2 instances turned out to be much more cost-effective. So servlerless is not appropriate for everything. My advice would be not to use java implementations of lambda unless they are called fairly infrequently or are implemented using GraalVM.