春天的表达不能解决型

问题描述：

我有标注有@PostAuthorize春天的表达不能解决型

@PostAuthorize("hasPermission(returnObject, new ReadUserPermission())") 
public Optional<User> find(String email) { 
    // implementation 
}

只要方法被调用服务的方法，春天抛出以下异常：

Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1003E:(pos 28): A problem occurred whilst attempting to construct an object of type 'ReadUserPermission' using arguments '()' 
    at org.springframework.expression.spel.ast.ConstructorReference.findExecutorForConstructor(ConstructorReference.java:190) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.ConstructorReference.createNewInstance(ConstructorReference.java:151) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.ConstructorReference.getValueInternal(ConstructorReference.java:94) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.MethodReference.getArguments(MethodReference.java:147) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:79) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:113) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:105) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.security.access.expression.ExpressionUtils.evaluateAsBoolean(ExpressionUtils.java:11) ~[spring-security-core-3.1.2.RELEASE.jar:3.1.2.RELEASE] 
    ... 86 common frames omitted 
Caused by: org.springframework.expression.AccessException: Failed to resolve constructor 
    at org.springframework.expression.spel.support.ReflectiveConstructorResolver.resolve(ReflectiveConstructorResolver.java:121) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.ast.ConstructorReference.findExecutorForConstructor(ConstructorReference.java:181) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    ... 93 common frames omitted 
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1005E:(pos 0): Type cannot be found 'ReadUserPermission' 
    at org.springframework.expression.spel.support.StandardTypeLocator.findType(StandardTypeLocator.java:81) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    at org.springframework.expression.spel.support.ReflectiveConstructorResolver.resolve(ReflectiveConstructorResolver.java:61) ~[spring-expression-4.0.0.RELEASE.jar:4.0.0.RELEASE] 
    ... 94 common frames omitted

ReadUserPermission看起来是这样的：

@Component 
public class ReadUserPermission implements Permission<User> { 

    @Override 
    public boolean hasPermission(User user, User target) { 
     // implementation 
    } 
}

首先，0级也没有界面Permission注释@Component。我想也许弹簧需要注释来找到类型，但是如果我注解接口或类或两者都没关系。例外总是相同的。

答

我忽略了documentation的这一部分：

构造函数可以使用新的操作来完成。 完全合格的类名称应该用于除原始类型和字符串以外的所有字符串（其中int，float等可以使用）

春天的表达不能解决型

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