-
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.
Haven't written Java in years, but I'd take an enterprise edition program written in it, much like this one: https://github.com/Hello-World-EE/Java-Hello-World-Enterprise-Edition
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.