Question

我正在尝试使用ByteBuddy从具体类动态定义子类，如下所示

java.lang.IllegalStateException: Cannot access java.lang.reflect.Parameter#getModifiers
at net.bytebuddy.description.method.ParameterList$ForLoadedExecutable$Dispatcher$ForJava8CapableVm.getParameterCount(ParameterList.java:261)
at net.bytebuddy.description.method.ParameterList$ForLoadedExecutable.size(ParameterList.java:157)
at net.bytebuddy.description.method.ParameterList$TypeSubstituting.size(ParameterList.java:582)
at net.bytebuddy.matcher.CollectionSizeMatcher.matches(CollectionSizeMatcher.java:34)
at net.bytebuddy.matcher.CollectionSizeMatcher.matches(CollectionSizeMatcher.java:13)
at net.bytebuddy.matcher.MethodParametersMatcher.matches(MethodParametersMatcher.java:32)
at net.bytebuddy.matcher.MethodParametersMatcher.matches(MethodParametersMatcher.java:13)
at net.bytebuddy.matcher.ElementMatcher$Junction$Conjunction.matches(ElementMatcher.java:101)
at net.bytebuddy.matcher.ElementMatcher$Junction$Conjunction.matches(ElementMatcher.java:101)
at net.bytebuddy.matcher.FilterableList$AbstractBase.filter(FilterableList.java:96)
at net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy$Default$2.doExtractConstructors(ConstructorStrategy.java:82)
at net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy$Default.extractConstructors(ConstructorStrategy.java:176)
at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.applyConstructorStrategy(SubclassDynamicTypeBuilder.java:185)
at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:162)
at net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder.make(SubclassDynamicTypeBuilder.java:155)
at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase.make(DynamicType.java:2559)
...
Caused by: java.lang.IllegalAccessException: Reflection is not allowed on public int java.lang.reflect.Executable.getParameterCount()
at com.google.appengine.tools.development.agent.runtime.Runtime.verifyWhiteListed(Runtime.java:90)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:125)
at net.bytebuddy.description.method.ParameterList$ForLoadedExecutable$Dispatcher$ForJava8CapableVm.getParameterCount(ParameterList.java:259)

此代码适用于JUnit测试，但是当我在Google App Engine下运行时，我会遇到以下异常。

make()

执行方法{{1}}时抛出异常。

有没有办法在GAE下完成这项工作？

Answer 1

这是一个非常随机的限制，绝对是GAE的一个错误。请报告。

作为背景：Byte Buddy检测到JVM的版本并相应地提供功能。在这种情况下，它会检测到使用Java 8添加的参数API是否存在并使用它。然而，GAE似乎不允许通过反思来使用它。

在Google App Engine上使用ByteBuddy创建类时出现反射错误

1 个答案: