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Editorial Team
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Asked: 2026-05-26T02:41:53+00:00

My case is that i have a method that takes Collection and i have

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My case is that i have a method that takes Collection and i have the value as a list
when i tried to add the list value into collection parameter it doesn’t work, so should i cast it ?

UPDATE:
when i tried to create:

new org.springframework.security.core.userdetails.User(
                user.getEmail(), user.getPassword(), true, true, true, true,
                user.getAuthorities());

where user.getAuthorities() returns an arraylist of my defined Authority object

above code gives error that the constructor is undefined, when i add collection casting it works fine.

org.springframework.security.core.userdetails
Class User

Constructor 

User(java.lang.String username, java.lang.String password, 
boolean enabled, boolean accountNonExpired, 
boolean credentialsNonExpired, boolean accountNonLocked, 
java.util.Collection<? extends GrantedAuthority> authorities)
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1 Answer

  1. Editorial Team

    The javadoc of the User constructor tells you that the last argument must be a Collection<? extends GrantedAuthority>. So, you ArrayList will be accepted if it’s an ArrayList<Something>, where Something is GrantedAuthority or a class which implements GrantedAuthority.

    You still haven’t told us what was the exact type returned by the method user.getAuthorities(). Do you understand Generics? Have you read the Java tutorial about generics?

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