如何在jdk9 / java-9中使用sun.reflect包？

问题描述：

我正在使用jdk-9，我想在我的代码中使用 sun.reflect。* 包但我得到以下异常

I am using jdk-9 and I want to use sun.reflect.* package in my code but I am getting the below exception

Exception in thread 'main' java.lang.IllegalAccessError : class Test (in moudle: Unnamed Module) cannot access class sun.reflect.Reflaction (in module:java.base), sun.reflect is not exported to Unnamed module

当我使用下面的示例代码运行时JDK-9

when I run below sample code using JDK-9

public static void main(String args[]){
   System.out.println(Reflection.getCallerClass(3));
}

答

适用于较新的OpenJDK 9 EA构建。例如：

Works fine with newer OpenJDK 9 EA builds. For example:

$ java -version
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+138)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+138, mixed mode)

$ javac Test.java
Test.java:5: warning: Reflection is internal proprietary API and may be removed in a future release
    System.out.println(Reflection.getCallerClass(3));
                       ^
Note: Test.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 warning

$ java Test
null

似乎已将其修复为9-ea + 115版本，作为 JDK-8137058 。所以你可能正在使用旧的EA版本。一般来说，@ Holger是对的：这个API很有可能在将来的Java版本中完全消失，所以请考虑迁移到StackWalker API。

Seems that it was fixed in 9-ea+115 build as a part of JDK-8137058. So probably you are using older EA build. In general @Holger is right: there are big chances that this API will disappear completely in future Java versions, so consider migrating to StackWalker API.

如何在jdk9 / java-9中使用sun.reflect包？

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