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jOOλ
jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams. The JDK 8's main efforts (default methods, lambdas, and the Stream API) were focused around maintaining backwards compatibility and implementing a functional API for parallelism.
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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.
Jool has tuples and lots of extra niceties for working with streams, and I thing it has smaller surface than vavr. You have a method zipWithIndex than allows you to do
https://github.com/spring-projects/spring-framework/tree/main/spring-jcl (commons logging checked in)
https://github.com/flyway/flyway/blob/953724be5e353cbf9b782702425923fee36c772f/flyway-core/src/main/java/org/flywaydb/core/internal/jdbc/JdbcTemplate.java (and flyway copied jdbctemplate... that is a semi open source project mind you).