Scan the classpath for classes with custom annotation [duplicate]

This question already has answers here: Scanning Java annotations at runtime (13 answers) Closed 6 years ago.

For example if I have annotation @MyOwnAnnotation and have these classes in my classpath, so that I could scan classpath possibly with some kind of filter (example. scan onl开发者_运维问答y packages starting with my.own.app.*) and get list of all classes with annotation @MyOwnAnnotation? I'm using guice as injection framework and I don't use Spring.

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Yes, check out the Scannotation library.

Also, see the following blog post that documents use of Scannotation.

Basic example:

URL[] urls = ClasspathUrlFinder.findClassPaths(); // scan java.class.path
AnnotationDB db = new AnnotationDB();
db.scanArchives(urls);
Set<String> entityClasses =
    db.getAnnotationIndex().get(MyOwnAnnotation.class.getName());

Your annotations will need to have 'runtime' retention so that they are available in the .class file at runtime.

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You could try my library FastClasspathScanner:

List<String> classNames = new FastClassPathScanner("my.own.app")
    .scan()
    .getNamesOfClassesWithAnnotation(MyOwnAnnotation.class);

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I'd actually recommend another approach, better than all others (since they all use classpath scanning, which is slow). It's called ClassIndex and it INDEXES annotated classes:

https://github.com/atteo/classindex

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You can try corn-cps

Example:

List<Class<?>> classes = CPScanner.scanClasses(new PackageNameFilter("net.sf.corn.cps.*"),new ClassFilter().appendAnnotation(SampleAnnotation.class));

put the dependecy below in your pom.xml

<dependency>
    <groupId>net.sf.corn</groupId>
    <artifactId>corn-cps</artifactId>
    <version>1.0.1</version>
</dependency>