模块java.base无法读取模块java.desktop [英] module java.base does not read module java.desktop

问题描述

当我运行此测试时(使用jmockit和TestNG，不确定是否相关):

When I run this test (using jmockit and TestNG, not sure if that's relevant):

public class Test {
  @Test public void test(@Mocked ProcessBuilder pb) throws IOException {
    new Expectations() {{ pb.start(); result = null; }};
    assertNull(m());
  }

  public static Process m() throws IOException {
    return new ProcessBuilder("").start();
  }
}

我收到此异常:

java.lang.IllegalAccessError: class java.lang.ProcessBuilder (in module java.base) cannot access class javax.print.PrintException (in module java.desktop) because module java.base does not read module java.desktop

at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java)
....

我正在使用版本177.

I am using build 177.

我可以使用--add-reads java.base=java.desktop参数重新运行测试，它可以正常工作，但是我不太了解这里发生了什么.

I can rerun the test using --add-reads java.base=java.desktop argument and it works fine but I don't really understand what is happening here.

我为什么会收到该例外?

推荐答案

问题已修复为JMockit 1.34.

The issue has been fixed for JMockit 1.34.

在启动期间，JMockit会修改JRE类(添加一些字段)，以便为JRE类的模拟提供支持.被修改的实际类是任意的，并且使用javax.print.PrintException(作为次要选择)只是因为它通常不会在典型的测试运行中加载.在JDK 9上，无法从基本"模块访问此类，因此现在已被另一个替代.

During startup, JMockit modifies a JRE class (adding a few fields) in order to provide support for the mocking of JRE classes. The actual class which gets modified is arbitrary, and javax.print.PrintException was used (as a secondary choice) just because it usually never gets loaded in a typical test run. On JDK 9, this class is not accessible from the "base" module, so it was now replaced by another one which is.

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