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1. extends JPA searchByExample to compa... extends JPA searchByExample to compare attribute with null. (by default null means that example does not compare this attribute)

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   public abstract class ExtraSpecification {

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      public static <T> Specification<T> attributeNull(Example<T> example, String attributeName, boolean isNull) {

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          return (root, query, builder) -> {

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              List<Predicate> predicates = new ArrayList<>();

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              if (isNull)

2. Spring configuration for RestTemplat... Spring configuration for RestTemplate bean that create new RestTemplate with copy of initial user's AUTHORIZATION header

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   import lombok.RequiredArgsConstructor;

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   import org.springframework.boot.web.client.RestTemplateBuilder;

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   import org.springframework.context.annotation.Bean;

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   import org.springframework.context.annotation.Configuration;

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   import org.springframework.http.HttpHeaders;