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Ordered interface not respected on non-singleton aspects [SPR-14959] #19526

spring-projects-issues opened this issue Nov 28, 2016 · 1 comment
in: core type: enhancement


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@spring-projects-issues spring-projects-issues commented Nov 28, 2016

Ken DeLong opened SPR-14959 and commented

I am using Java 8, Boot 1.4.1, and Spring 4.3.3 (from Boot).

I have a set of aspects that I instantiate as prototype scope, because they maintain state (like a CircuitBreaker) and they are individually exported to JMX for monitoring purposes.

The interceptors under consideration are:

The ordering of these interceptors is critical (and also the ordering relative to TransactionInterceptor and MethodSecurityInterceptor). However, the Ordered interface is not being respected here. My configuration (XML here, but JavaConfig behaves the same) is

<bean class="com.kendelong.util.circuitbreaker.CircuitBreakerAspect" scope="prototype">
<property name="graphiteClient" ref="graphiteClient"/>
<property name="order" value="100" />

However, the aspects are ordered randomly.

I tried to trace this through the code, to the AnnotationAwareOrderComparator.findOrder() method.  It returns after the first check for the Ordered interface (line 65), which is good, but the value it returns is Integer.MAX_VALUE, which is bad.  OrderComparator.findOrder() returns the Integer.  From there it asks the LazySingletonAspectInstanceFactoryDecorator for the order, which delegates to BeanFactoryAspectInstanceFactory.getOrder().  Finally, that method calls OrderUtils.getOrder() (line 68)  but this method ONLY looks for the annotation then gives up and assigns the default value.  I think perhaps this method should also check for the Ordered interface and call that getOrder() method.

If I use the @Order annotation on my aspects, it works fine.  But as this is a reusable library, hard-coding the order values may be incompatible with the project using the library.

Affects: 4.3.3

Reference URL:

Issue Links:

  • #19256 ScheduledAnnotationBeanPostProcessor should reliably apply after AnnotationAwareAspectJAutoProxyCreator
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@spring-projects-issues spring-projects-issues commented Nov 28, 2016

Juergen Hoeller commented

This is currently explicitly limited to singleton beans: See BeanFactoryAspectInstanceFactory's getOrder implementation and documentation. For non-singleton beans, we'd have to create a temporary instance just to retrieve the order value, since the Ordered interface implies instance-specific order state.

We can certainly revisit this but might only be able to do so for 5.0.

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