java LogManager忽略已启用的断言

Question

在调试器中单步执行java.util.logging.LogManager代码时，我发现 由于第1301行的异常情况

try (final InputStream in = new FileInputStream(fname)) {

407号线的拦截器

assert false : "Exception raised while reading logging configuration: " + ex;

应该但不要抛出AssertionError

虚拟机选项：-ea -Djava.util.logging.config.file=logging.properties

Answer 1

你必须使用-esaenable assertions in all system classes。根据-ea[:[packagename]...|:classname]的文件：

The -enableassertions (-ea) option applies to all class loaders and to system classes (which do not have a class loader). There is one exception to this rule: if the option is provided with no arguments, then it does not apply to system classes. This makes it easy to enable assertions in all classes except for system classes. The -enablesystemassertions option provides a separate switch to enable assertions in all system classes.

下面是一个测试用例，用于验证在有-esa和没有-esa的情况下应该运行的行为：

public static void main(String[] args) {
    System.out.println(LogManager.class.desiredAssertionStatus());
}

另一个选项是，通过将命令行设置为：-ea -ea:java.util.logging.LogManager，只启用用户代码的断言和日志管理器