e25e690ad4
Prior to this commit, if null values were supplied for the RepeatableContainers or AnnotationFilter arguments to `from()` factory methods in MergedAnnotations, certain operations would eventually result in a NullPointerException. This is to be expected; however, the NullPointerException is often swallowed and only logged at INFO level with an exception message similar to the following. > Failed to introspect annotations on org.example.MyClass: NullPointerException In such cases, the INFO log message is not helpful in diagnosing the problem. Furthermore, since the exception is swallowed, the desired operation (e.g., MergedAnnotations.stream(...)) simply returns no results. This commit improves the user experience by eagerly asserting non-null preconditions for required arguments in MergedAnnotations.from() factory methods. Closes gh-25568
Spring Framework 
This is the home of the Spring Framework: the foundation for all Spring projects. Collectively the Spring Framework and the family of Spring projects are often referred to simply as "Spring".
Spring provides everything required beyond the Java programming language for creating enterprise applications for a wide range of scenarios and architectures. Please read the Overview section as reference for a more complete introduction.
Code of Conduct
This project is governed by the Spring Code of Conduct. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io.
Access to Binaries
For access to artifacts or a distribution zip, see the Spring Framework Artifacts wiki page.
Documentation
The Spring Framework maintains reference documentation (published and source), Github wiki pages, and an API reference. There are also guides and tutorials across Spring projects.
Build from Source
See the Build from Source Wiki page and the CONTRIBUTING.md file.
Stay in Touch
Follow @SpringCentral, @SpringFramework, and its team members on Twitter. In-depth articles can be found at The Spring Blog, and releases are announced via our news feed.
License
The Spring Framework is released under version 2.0 of the Apache License.