Spring-boot: refreshAfterWrite not working for Caffeine cache

[shahid21st]

I am trying this project: https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples/spring-boot-sample-cache to test out Caffeine cache with refreshAfterWrite settings. See the attached modified project. As soon as I use refreshAfterWrite in application.properties I got the following stack trace:

2016-12-01 14:48:16.065  INFO 14246 --- [           main] s.cache.SampleCacheApplicationTests      : Started SampleCacheApplicationTests in 15.355 seconds (JVM running for 17.169)

java.lang.IllegalStateException: refreshAfterWrite requires a LoadingCache

    at com.github.benmanes.caffeine.cache.Caffeine.requireState(Caffeine.java:181)
    at com.github.benmanes.caffeine.cache.Caffeine.requireNonLoadingCache(Caffeine.java:894)
    at com.github.benmanes.caffeine.cache.Caffeine.build(Caffeine.java:802)
    at org.springframework.cache.caffeine.CaffeineCacheManager.createNativeCaffeineCache(CaffeineCacheManager.java:210)
    at org.springframework.cache.caffeine.CaffeineCacheManager.createCaffeineCache(CaffeineCacheManager.java:197)
    at org.springframework.cache.caffeine.CaffeineCacheManager.getCache(CaffeineCacheManager.java:183)
    at sample.cache.SampleCacheApplicationTests.validateCache(SampleCacheApplicationTests.java:42)
    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$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

2016-12-01 14:48:16.122  INFO 14246 --- [       Thread-1] o.s.w.c.s.GenericWebApplicationContext   : Closing org.springframework.web.context.support.GenericWebApplicationContext@298a5e20: startup date [Thu Dec 01 14:48:11 AEDT 2016]; root of context hierarchy

spring-boot-sample-cache.zip

[shahid21st]

Same error happens for Guava.

[snicoll]

Thanks for getting in touch, but it feels like this is a question that would be better suited to Stack Overflow. As mentioned in the guidelines for contributing, we prefer to use GitHub issues only for bugs and enhancements. Feel free to update this issue with a link to the re-posted question (so that other people can find it) or add some more details if you feel this is a genuine bug.

It should be pretty obvious from the stacktrace that this exception comes from Guava/Caffeine. There's nothing Spring Boot can do about that.

[ben-manes]

The issue is that no cache loader has been configured. You'd need to use Java configuration for that. The annotations use the get(key, function) if sync or else get/put, so there is no attached loader for us to automatically refresh with.