Returning a Mono root object from a custom EvaluationContextExtensionSupport does not work [DATACMNS-1365] #1801
Description
Gabor szabo opened DATACMNS-1365 and commented
Using Spring Boot 2.0.4.RELEASE, spring-boot-starter-webflux, spring-boot-starter-security and spring-boot-starter-data-mongodb-reactive, I tried to create a custom EvaluationContextExtensionSupport that returns a part of the Authentication object.
The class is the following:
public class PrincipalEvaluationContextExtensionSupport extends EvaluationContextExtensionSupport {
@Override
public String getExtensionId() {
return "principal";
}
@Override
public Mono<Principal> getRootObject() {
return ReactiveSecurityContextHolder.getContext().map(SecurityContext::getAuthentication).map(Authentication::getPrincipal).map(principal -> (Principal) principal);
}
}
This is a dummy ReactiveCrudRepository that would use my custom extension:
@Repository
public interface ItemRepository extends ReactiveCrudRepository<Item, String> {
@Query("{ email: ?#
{principal.email}
}")
Flux<Item> findByUser();
}
The Item class:
@Data
@Document
@NoArgsConstructor
@AllArgsConstructor
@RequiredArgsConstructor
public class Item
{ @Id private String id; @NotNull @NonNull private String description; @NotNull @NonNull private String email; }
Note that Principal is just a simple POJO. If I return a dummy Principal instance instead of a Mono<Principal>, everything works fine. However, with Mono, the following exception is thrown:
org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'email' cannot be found on object of type 'org.springframework.data.repository.query.ExtensionAwareEvaluationContextProvider$EvaluationContextExtensionAdapter' - maybe not public or not valid?org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'email' cannot be found on object of type 'org.springframework.data.repository.query.ExtensionAwareEvaluationContextProvider$EvaluationContextExtensionAdapter' - maybe not public or not valid? at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:407) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:89) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:116) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:306) ~[spring-expression-5.0.8.RELEASE.jar:5.0.8.RELEASE] at org.springframework.data.mongodb.repository.query.ExpressionEvaluatingParameterBinder.evaluateExpression(ExpressionEvaluatingParameterBinder.java:246) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.ExpressionEvaluatingParameterBinder.getParameterValueForBinding(ExpressionEvaluatingParameterBinder.java:217) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.ExpressionEvaluatingParameterBinder.replacePlaceholders(ExpressionEvaluatingParameterBinder.java:137) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.ExpressionEvaluatingParameterBinder.bind(ExpressionEvaluatingParameterBinder.java:107) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.ReactiveStringBasedMongoQuery.createQuery(ReactiveStringBasedMongoQuery.java:125) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.AbstractReactiveMongoQuery.execute(AbstractReactiveMongoQuery.java:108) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.mongodb.repository.query.AbstractReactiveMongoQuery.execute(AbstractReactiveMongoQuery.java:91) ~[spring-data-mongodb-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:590) ~[spring-data-commons-2.0.9.RELEASE.jar:2.0.9.RELEASE] at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578) ~[spring-data-commons-2.0.9.RELEASE.jar:2.0.9.RELEASE]
...
I'm not sure if it is a Spring Data Commons or a Spring Data MongoDB issue, or is it a feature request that is not supported yet?
Unfortunately I don't find a workaround. I cannot call block on the Mono because then Spring WebFlux throws an exception, but I cannot get the Authentication object synchronously.
Thanks for the help/guidelines
No further details from DATACMNS-1365