启用 AOP 会破坏我对带有字符串的工厂 bean 的依赖注入
启用 AOP 会破坏我对带有字符串的工厂 bean 的依赖注入。
这是上下文文件中的片段：
<aop:aspectj-autoproxy/>
<bean id="foo"
class="FooFactory"
p:url-ref="url"/>
<bean id="url" class="java.lang.String">
<constructor-arg value="#{ 'localhost:50131'}"/>
</bean>
这是工厂 bean。
public class FooFactory extends AbstractFactoryBean<Foo> {
private String url;
public void setUrl(final String url) {
this.url = url;
}
@Override
public Class<?> getObjectType() {
return Foo.class;
}
@Override
protected Foo createInstance() throws Exception {
Validate.notNull(url, "null URL");
return new FooFactory().createFoo(new String[]{url});
}
}
这是唯一声明的方面：
@Component
@Aspect
public class ProfilerAspect {
@Around("@target(org.springframework.stereotype.Controller) && args(model,..)")
public Object profileController(final ProceedingJoinPoint proceedingJoinPoint, final Model model) throws Throwable {
return proceedingJoinPoint.proceed();
}
}
这是例外
java.lang.IllegalStateException: Cannot convert value of type [$Proxy13 implementing java.io.Serializable,java.lang.Comparable,java.lang.CharSequence,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [java.lang.String] for property 'url': no matching editors or conversion strategy found
Enabling AOP breaks my dependency injection for a factory bean that takes a string.
Here's the fragment from the context file:
<aop:aspectj-autoproxy/>
<bean id="foo"
class="FooFactory"
p:url-ref="url"/>
<bean id="url" class="java.lang.String">
<constructor-arg value="#{ 'localhost:50131'}"/>
</bean>
Here's the factory bean.
public class FooFactory extends AbstractFactoryBean<Foo> {
private String url;
public void setUrl(final String url) {
this.url = url;
}
@Override
public Class<?> getObjectType() {
return Foo.class;
}
@Override
protected Foo createInstance() throws Exception {
Validate.notNull(url, "null URL");
return new FooFactory().createFoo(new String[]{url});
}
}
Here is the only declared aspect:
@Component
@Aspect
public class ProfilerAspect {
@Around("@target(org.springframework.stereotype.Controller) && args(model,..)")
public Object profileController(final ProceedingJoinPoint proceedingJoinPoint, final Model model) throws Throwable {
return proceedingJoinPoint.proceed();
}
}
And this is the exception
java.lang.IllegalStateException: Cannot convert value of type [$Proxy13 implementing java.io.Serializable,java.lang.Comparable,java.lang.CharSequence,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [java.lang.String] for property 'url': no matching editors or conversion strategy found
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评论（2）
看来，它与切入点表达式中的
@target指示符有关。我可以使用与您类似的简单设置来重现该行为（仅在切入点中使用自定义注释）。不过，它与简单的execution()指示符一起工作得很好。不幸的是，我不知道为什么这会导致 Spring 代理 String 对象。
It seems, that it has to do with the
@targetdesignator in the pointcut expression. I can reproduce the behaviour with a simple setup similar to yours (with only a custom annotation in the pointcut). It works fine with a simpleexecution()designator though.Unfortunatly, I have no idea why this causes Spring to proxy the String object.
String，因此它已被代理。<aop:aspectj-autoproxy/>doesn't perform proxying without a reason. Perhaps you declared some aspect whose pointcut includesStrings, therefore it have been proxied.