Reflections could not get class type

Question

So I am using the Java Reflections API to search another jar for Classes that extend Foo using the following code:

Reflections reflections =          


        

Answer 1

Scanning for classes is not easy with pure Java.

The spring framework offers a class called ClassPathScanningCandidateComponentProvider that can do what you need. The following example would find all subclasses of MyClass in the package org.example.package

ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
 provider.addIncludeFilter(new AssignableTypeFilter(MyClass.class));

// scan in org.example.package
 Set components = provider.findCandidateComponents("org/example/package");
for (BeanDefinition component : components)
{

This method has the additional benefit of using a bytecode analyzer to find the candidates which means it will not load all classes it scans. Class cls = Class.forName(component.getBeanClassName()); // use class cls found }

Fore more info read the link