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spring同时使用aop和spel表达式出错：Property or field 'instrument' cannot be found on object of type 'com.sun.pr

2016-08-10 12:18 1686 查看

错误信息：

Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 6): Property or field 'instrument' cannot be found on object of type 'com.sun.proxy.$Proxy2' - maybe not public?

at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:224)

at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:94)

at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:46)

at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:374)

at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88)

at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:120)

at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:242)

at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:161)

... 23 more

由于aop是默认创建的代理是基于接口的，不能访问类的方法。performer接口中只有一个perform方法，所以会报错：

Property or field 'instrument' cannot be found on object of type 'com.sun.proxy.$Proxy2' -

解决此问题，只需要在aop：config中加上

proxy-target-class="true"

就行了

<aop:config proxy-target-class="true">
<aop:aspect ref="log">
<aop:pointcut id="perform" expression="execution(* algo.study.spring.xmlbean.Performer.perform(..))" />
<aop:before pointcut-ref="perform" method="start" />
<aop:after pointcut-ref="perform" method="end" />
</aop:aspect>
</aop:config>

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标签： spring aop

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