warning: an illegal reflective access operation has occurred

这是一个由于 Java 程序运行时反射操作导致的错误。反射是 Java 程序中用于在运行时访问、操作类、接口、字段和方法的机制，但是反射操作也可能会导致安全问题。请检查程序代码是否正确使用了反射操作。

相关问题

WARNING: An illegal reflective access operation has occurred

This warning message indicates that the Java code is using a feature that is not officially supported or recommended by the Java development team. This can be caused by using an outdated or deprecated API, or by using a third-party library that is not compliant with the latest Java standards.

While this warning message does not necessarily mean that the code is broken or will not function, it is a good idea to investigate why the code is generating this warning and see if there is a more compliant way to achieve the same functionality. Ignoring this warning could result in compatibility issues or security vulnerabilities in the future.

WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.apache.flink.api.java.ClosureCleaner (file:/opt/flink/lib/flink-dist-1.17.0.jar) to field java.lang.Class.ANNOTATION WARNING: Please consider reporting this to the maintainers of org.apache.flink.api.java.ClosureCleaner WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release 什么意思

这是Flink程序运行时发出的警告消息，其中包含了三个警告信息：

1. "An illegal reflective access operation has occurred"：发生了一个非法的反射访问操作。
2. "Illegal reflective access by org.apache.flink.api.java.ClosureCleaner"：非法的反射访问由`org.apache.flink.api.java.ClosureCleaner`类触发。
3. "Please consider reporting this to the maintainers of org.apache.flink.api.java.ClosureCleaner"：建议将此问题报告给`org.apache.flink.api.java.ClosureCleaner`的维护人员。

这些警告信息的含义是，Flink程序在运行时使用了Java反射机制来访问某些类的私有字段或方法，这种操作是不安全的，并且在未来的Java版本中可能会被禁止。因此，程序建议使用`--illegal-access=warn`参数来启用警告提示，并且应该避免使用反射机制来访问私有的Java API。如果问题无法解决，可以考虑将此问题报告给`org.apache.flink.api.java.ClosureCleaner`的维护人员，以便他们修复问题。