CODEWITHSUNDEEP
javaspring-bootspring-data
Valeamor
Valeamor

Reputation: 53

How to call a method from a bean dynamically

I use spring boot, query from database like this: 

@Repository
public interface MyRepository extends CrudRepository<MyEntity, Integer> {
  List<MyEntity> findAllByIdIn(List<Integer> ids);
}

And I want to invoke this method "findAllByIdIn" dynamically:

Object bean = context.getBean("myRepository");
bean.getClass().getMethod("findAllByIdIn").invoke(bean, ids);

I got an exception:

java.lang.NoSuchMethodException: com.sun.proxy.$Proxy145.findAllByIdIn()

How can I invoke that method?

Upvotes: 2

Views: 5054

Answers (2)

Alien
Alien

Reputation: 15878

From the error java.lang.NoSuchMethodException: com.sun.proxy.$Proxy145.findAllByIdIn() it is clear that your code is trying to get a method with no argument which is really not present.

So try to pass parameters also as it is expecting parameters something like below.

getMethod("findAllByIdIn",List.class)

Upvotes: 2

Denis Zavedeev
Denis Zavedeev

Reputation: 8297

getMethod accepts 2 parameters. The first one is a method name and the second one is vararg of method parameters types.

Your code tries to get findAllByIdIn method without arguments, but your repository does not have it.

So the fix is:

bean.getClass().getMethod("findAllByIdIn", List.class)

Upvotes: 3

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