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awesome-spring
A curated list of awesome books, tutorials, courses, and resources for the Spring framework ecosystem.
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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.
Check https://github.com/ThomasVitale/awesome-spring for a bunch of resources and projects. Start building projects and then search for the topic you are interested in, in the sites that are listed in the Blog section. For validation and exceptions check the article wrote by Reflectoring, it was very detailed and easy to understand. For JPA articles and blogs didn't really help me, so I recommend the book "Java Persistence with Hibernate".