java - 如何抑制 "unknown enum constant"警告？

Question

The Checkers Framework引用了 JDK8 中添加的 java.lang.annotation.ElementType.TYPE_USE。当我在 JDK7 下使用它时，我收到以下警告:

未知枚举常量 java.lang.annotation.ElementType.TYPE_USE

这是一个合理的警告，但是我如何在我认为无害的情况下抑制它？

Answer 1

事实证明，没有无害的未知枚举常量这样的东西。一旦我通过了编译器警告，我在运行时遇到了异常:

java.lang.ArrayStoreException: sun.reflect.annotation.EnumConstantNotPresentExceptionProxy
    at sun.reflect.annotation.AnnotationParser.parseEnumArray(AnnotationParser.java:693) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseArray(AnnotationParser.java:482) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseMemberValue(AnnotationParser.java:306) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotation(AnnotationParser.java:241) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:88) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:70) ~[na:1.7.0_40]
    at java.lang.Class.initAnnotationsIfNecessary(Class.java:3168) ~[na:1.7.0_40]
    at java.lang.Class.getAnnotation(Class.java:3127) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationType.<init>(AnnotationType.java:131) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationType.getInstance(AnnotationType.java:84) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotation(AnnotationParser.java:221) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:88) ~[na:1.7.0_40]
    at sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:70) ~[na:1.7.0_40]
    at java.lang.reflect.Method.declaredAnnotations(Method.java:714) ~[na:1.7.0_40]
    at java.lang.reflect.Method.getAnnotation(Method.java:700) ~[na:1.7.0_40]
    at com.google.inject.spi.InjectionPoint.getAtInject(InjectionPoint.java:466) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.spi.InjectionPoint.getInjectionPoints(InjectionPoint.java:664) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.spi.InjectionPoint.forInstanceMethodsAndFields(InjectionPoint.java:356) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.MembersInjectorStore.createWithListeners(MembersInjectorStore.java:90) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.MembersInjectorStore.access$000(MembersInjectorStore.java:34) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:42) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.MembersInjectorStore$1.create(MembersInjectorStore.java:39) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.FailableCache$1.apply(FailableCache.java:39) ~[guice-3.0-no_aop.jar:na]
    at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:549) ~[guice-3.0-no_aop.jar:na]
    ... 102 common frames omitted

意思是，任何使用 java.lang.reflect.Method.getAnnotation() 的代码都会在运行时失败。

在我的例子中，这个问题是由 https://code.google.com/p/checker-framework/issues/detail?id=255 引起的