Spring Cache抽象VS接口VS關鍵參數（「返回緩存操作的空鍵」錯誤）

Question

在實現時，我遇到了Spring Cache抽象VS接口的問題。 可以說我有以下接口：

package com.example.cache; 

public interface IAddItMethod 
{ 
    Integer addIt(String key); 
} 

與以下兩種實現方式：

package com.example.cache; 

import org.springframework.cache.annotation.Cacheable; 
import org.springframework.stereotype.Component; 

@Component 
public class MethodImplOne implements IAddItMethod 
{ 
    @Override 
    @Cacheable(value="integersPlusOne", key="#keyOne") 
    public Integer addIt(String keyOne) 
    { 
     return new Integer(Integer.parseInt(keyOne) + 1); 
    } 
} 

。

package com.example.cache; 

import org.springframework.cache.annotation.Cacheable; 
import org.springframework.stereotype.Component; 

@Component 
public class MethodImplTwo implements IAddItMethod 
{ 
    @Override 
    @Cacheable(value="integersPlusTwo", key="#keyTwo") 
    public Integer addIt(String keyTwo) 
    { 
     return new Integer(Integer.parseInt(keyTwo) + 2); 
    } 
} 

請注意，IAddItMethod不是指定@Cacheable的那個。我們可以有沒有@Cacheable註釋的其他實現（例如MethodImplThree）。

我們已經有了一個簡單的beans.xml有：

context:component-scan base-package="com.example.cache" 

添加到兩個JUnit測試案例：

package com.example.cache; 

import static org.junit.Assert.assertEquals; 

import org.junit.Test; 
import org.junit.runner.RunWith; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.test.context.ContextConfiguration; 
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; 

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration(locations = {"classpath:beans.xml"}) 
public class MethodImplOneTest 
{ 

    @Autowired 
    @Qualifier("methodImplOne") 
    private IAddItMethod classUnderTest; 

    @Test 
    public void testInit() 
    { 
     int number = 1; 
     assertEquals(new Integer(number + 1), classUnderTest.addIt("" + number)); 
    } 

} 

。

package com.example.cache; 

import static org.junit.Assert.assertEquals; 

import org.junit.Test; 
import org.junit.runner.RunWith; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.test.context.ContextConfiguration; 
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; 

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration(locations = {"classpath:beans.xml"}) 
public class MethodImplTwoTest 
{ 

    @Autowired 
    @Qualifier("methodImplTwo") 
    private IAddItMethod classUnderTest; 

    @Test 
    public void testInit() 
    { 
     int number = 1; 
     assertEquals(new Integer(number + 2), classUnderTest.addIt("" + number)); 
    } 

} 

當我單獨運行測試，他們成功了。 但是，如果我跑他們兩個在一起（選擇包，右鍵單擊，運行），第二個（不一定MethodImplTwoTest，只是第二個運行）將失敗，但以下情況除外：

 
java.lang.IllegalArgumentException: Null key returned for cache operation (maybe you are using named params on classes without debug info?) CacheableOperation[public java.lang.Integer com.example.cache.MethodImplOne.addIt(java.lang.String)] caches=[integersPlusOne] | condition='' | key='#keyOne' 
    at org.springframework.cache.interceptor.CacheAspectSupport.inspectCacheables(CacheAspectSupport.java:297) 
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:198) 
    at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) 
    at $Proxy16.addIt(Unknown Source) 
    at com.example.cache.ITMethodImplOneIntegrationTest.testInit(ITMethodImplOneIntegrationTest.java:26) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) 
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) 
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

注意：我正在使用Eclipse STS 3.0，並且「添加變量屬性到生成的類文件」已啓用。

重要提示：如果我沒有在@Cacheable註釋中指定「key」，它將起作用。

有什麼我忘了指定？配置？註釋？

在此先感謝！

Answer 1

我的猜測是，對於jdk代理，參數名稱是從接口方法獲取的，所以它是關鍵而不是keyTwo。

更新：您可以嘗試使用的參數指標，而不是

如果由於某種原因名稱是不可用（例如：沒有調試 信息），參數名稱也是在p <下可用#arg> 其中#arg代表參數索引（從0開始）。

看到http://static.springsource.org/spring/docs/3.1.0.M1/spring-framework-reference/html/cache.html#cache-spel-context