Scan the classpath in Java: how to find all annotated classes

In order to find all annotated classes by using the ClassHunter, we must add the following dependency to our pom.xml:

<dependency>
    <groupId>org.burningwave</groupId>
    <artifactId>core</artifactId>
    <version>12.64.3</version>
</dependency>

… And to use Burningwave Core as a Java module, add the following to your module-info.java:

requires org.burningwave.core;

Now we are able to find all annotated classes:

import java.util.Collection;

import org.burningwave.core.assembler.ComponentContainer;
import org.burningwave.core.assembler.ComponentSupplier;
import org.burningwave.core.classes.ClassCriteria;
import org.burningwave.core.classes.ClassHunter;
import org.burningwave.core.classes.ConstructorCriteria;
import org.burningwave.core.classes.FieldCriteria;
import org.burningwave.core.classes.MethodCriteria;
import org.burningwave.core.classes.SearchConfig;
import org.burningwave.core.io.PathHelper;

public class Finder {

    public Collection<Class<?>> find() {
        ComponentSupplier componentSupplier = ComponentContainer.getInstance();
        PathHelper pathHelper = componentSupplier.getPathHelper();
        ClassHunter classHunter = componentSupplier.getClassHunter();

        SearchConfig searchConfig = SearchConfig.forPaths(
            //Here you can add all absolute path you want:
            //both folders, zip and jar will be recursively scanned.
            //For example you can add: "C:\\Users\\user\\.m2"
            //With the line below the search will be executed on runtime Classpaths
            pathHelper.getMainClassPaths()
        ).by(
            ClassCriteria.create().allThoseThatMatch((cls) -> {
                return cls.getAnnotations() != null && cls.getAnnotations().length > 0;
            }).or().byMembers(
                MethodCriteria.withoutConsideringParentClasses().allThoseThatMatch((method) -> {
                    return method.getAnnotations() != null && method.getAnnotations().length > 0;
                })
            ).or().byMembers(
                FieldCriteria.withoutConsideringParentClasses().allThoseThatMatch((field) -> {
                    return field.getAnnotations() != null && field.getAnnotations().length > 0;
                })
            ).or().byMembers(
                ConstructorCriteria.withoutConsideringParentClasses().allThoseThatMatch((ctor) -> {
                    return ctor.getAnnotations() != null && ctor.getAnnotations().length > 0;
                })
            )
        );

        try (ClassHunter.SearchResult searchResult = classHunter.findBy(searchConfig)) {
    
            //If you need all annotaded methods unconment this
            //searchResult.getMembersFlatMap().values();
    
            return searchResult.getClasses();
        }
    }
}

Flexible

It’s possible to search classes by every criteria that your imagination can make by using lambda expressions

Optimized

Scan engine is highly optimized using direct allocated ByteBuffers to avoid heap saturation

Open

Burningwave core is an advanced free and open source Java library