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在 Java 9 中，模块之间不允许循环，因此 A 需要 B，但 B 不能需要 A。

但是，通过查看 JDK 代码库，我可以看到该java.management模块包含 exports com.sun.jmx.remote.util to java.management.rmi;，并且在java.management.rmi模块中我看到了导出com.sun.jmx.remote.protocol.rmi to java.management;

为什么对导出语句放宽这个循环规则？

module java.management {
    exports javax.management.remote;
    exports javax.management.timer;
    exports sun.management.counter to jdk.management.agent;
    exports com.sun.jmx.remote.util to java.management.rmi;
    exports com.sun.jmx.remote.security to jdk.management.agent, java.management.rmi;
    exports sun.management to jdk.management, jdk.management.agent, jdk.jconsole;
    exports javax.management.modelmbean;
    exports com.sun.jmx.remote.internal to jdk.management.agent, java.management.rmi;
    exports java.lang.management;
    exports sun.management.counter.perf to jdk.management.agent;
    exports javax.management;
    exports javax.management.relation;
    exports sun.management.spi to jdk.management;
    exports javax.management.openmbean;
    exports javax.management.monitor;
    exports javax.management.loading;

    uses javax.management.remote.JMXConnectorProvider;
    uses javax.management.remote.JMXConnectorServerProvider;
    uses sun.management.spi.PlatformMBeanProvider;

    provides javax.security.auth.spi.LoginModule with com.sun.jmx.remote.security.FileLoginModule;
}

和

module java.management.rmi {
    requires transitive java.management;
    requires transitive java.rmi;
    requires java.naming;

    exports javax.management.remote.rmi;
    exports com.sun.jmx.remote.protocol.rmi to java.management;
    exports com.sun.jmx.remote.internal.rmi to jdk.management.agent;

    provides javax.management.remote.JMXConnectorServerProvider with com.sun.jmx.remote.protocol.rmi.ServerProvider;
    provides javax.management.remote.JMXConnectorProvider with com.sun.jmx.remote.protocol.rmi.ClientProvider;
}
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