Find all groups in LDAP #springboot #ldap

LdapGroupsProvider.java

public static class LdapGroupsProvider {
    private List<String> groups = new ArrayList<>();

    @Override
    public List<String> getGroups() {
        groups.clear();
        final DefaultSpringSecurityContextSource contextSource =
                new DefaultSpringSecurityContextSource("ldap://localhost:8389/dc=springframework,dc=org");
        contextSource.setAnonymousReadOnly(true);
        contextSource.afterPropertiesSet();

        LdapTemplate ldapTemplate = new LdapTemplate(contextSource);
        try {
            ldapTemplate.afterPropertiesSet();

            SearchControls controls = new SearchControls();
            AndFilter filter = new AndFilter();
            filter.and(new EqualsFilter("objectclass", "groupOfUniqueNames"));

            // List<Group> groups =
            List<String> groups = ldapTemplate.search("ou=groups", filter.encode(), controls, new AttributesMapper<String>(){

                @Override
                public String mapFromAttributes(Attributes attributes) throws NamingException {
                    Attribute attribute = attributes.get("ou");
                    return (String) attribute.get() + "@ldap";
                }
            });
            this.groups.addAll(groups);
        } catch (Exception e) {

        }
        return Collections.unmodifiableList(groups);
    }
}

@Bean
public LdapGroupsProvider ldapGroupsProvider() {
    return new LdapGroupsProvider();
}