Apache Lucene's indexing and searching capabilities make it attractive for any number of uses—development or academic. See an example of how the search engine works.
JavaParser can give you a quick hand manipulating your AST and finding Javadoc comments. It can't return them in a structured way (yet), but it's still a time saver.
The past month has been a busy one for Java. Licensing concerns abound, but Java is as popular as ever. Microservices are also a continuing trend, as are containers.
Spring Cloud Eureka's self-preservation tool is great for network problems, but it could keep your instances around when you don't want to. Fortunately, you can fix that.
This comprehensive look at Java monitoring tools and commands will make sure you get the data you need to make your apps a success while protecting your prod environment.
Take a look at how to marshal and unmarshal your Java objects and XML data with JAXB 2.0, a useful tool for generating XML schemas from Java code and vice-versa.