NoSuchMethodException in a abstract class

I have a class who extends an abstract class. In this abstract class, I have a method named findAll.

Class<?> clazz = Class.forName("com.zirca.service.CarTypesServiceImpl");
Object springService = appContext.getBean(clazz);clazz.getMethods()
Method m = clazz.getDeclaredMethod("findAll");
Object o = m.invoke(springService);

on getDeclaredMethod, I get this error

java.lang.NoSuchMethodException: com.zirca.service.CarTypesServiceImpl.findAll()

When I do

clazz.getMethods()

I see my findAll method

Any idea?