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Checkstyle
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
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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.
I’m a little out of date with Java, but I believe Checkstyle is currently popular: https://github.com/checkstyle/checkstyle
I would strongly suggest your partner start reading other people's code on things like Github, etc., and see how they're written. For example, looking at Valve software's ExoPlayer (here), we can see a number of things:
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Java Checkstyle reports formatting as a warning, not an error despite my explicit severity
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Checkstyle - development tool to help programmers write Java code that adheres to a coding standard.
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What is the most popular Code Style Guide in the Java world?
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Checkstyle
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