How to test Spring @Cacheable using customized key with SpEL

Question

I was looking for a way to test some of my @Cacheable and @CacheEvict methods and I've found out a very good explanation here.

However, my case is a bit different and trickier.

So, using the code from that post as example, I've added a cache key using spEL:

  interface MyRepo {
    @Cacheable(value = "sample", key = "#email.concat('.').concat(#email)")
    Object findByEmail(String email);
  }

Now, when trying to use Mockito.when(...):

  Mockito
    .when(repo.findByEmail(Mockito.any(String.class)))
    .thenReturn(first, second);

I got this spEl exception:

org.springframework.expression.spel.SpelEvaluationException: EL1011E: Method call: Attempted to call method concat(java.lang.String) on null context object
    at org.springframework.expression.spel.ast.MethodReference.throwIfNotNullSafe(MethodReference.java:144)
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:95)
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:85)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:57)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:87)
    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.cache.interceptor.CacheOperationExpressionEvaluator.key(CacheOperationExpressionEvaluator.java:117)
    at org.springframework.cache.interceptor.CacheAspectSupport$CacheOperationContext.generateKey(CacheAspectSupport.java:742)
    at org.springframework.cache.interceptor.CacheAspectSupport.generateKey(CacheAspectSupport.java:558)
    at org.springframework.cache.interceptor.CacheAspectSupport.findCachedItem(CacheAspectSupport.java:502)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:389)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:327)
    at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    at techne.cronos.$Proxy36.findByEmail(Unknown Source)
    at techne.cronos.CachingIntegrationTest.methodInvocationShouldBeCached(CachingIntegrationTest.java:65)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:539)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:761)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:461)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:207)

Does anyone have some guidance on how to pass through this testing issue?

score 0 · Answer 1 · answered Feb 01 '18 at 18:00

0

That's because your Mockito.any(String.class)) return null, Always this expression will give you null (try some print and check)

The concat method on the Spel require not null object

Use a hard coded string as an argument to findByEmail and your problem is gone

In case you want to know more about Mockito.any(..) check doc

Cheers

answered Feb 01 '18 at 18:00

elmehdi

449
2
10

I thought that either, but it is not true. I've tried Mockito.when(repo.findByEmail("something")).thenReturn(first, second); and the error prevails. – Reginaldo Santos Feb 01 '18 at 18:22

How to test Spring @Cacheable using customized key with SpEL

1 Answers1