我尝试在Eclipse中编译一些Java代码时遇到了一些小问题。我一直收到下面的警告...type OperatingSystemMXBean is not accessible due to restriction on required library C:\Program Files\Javacom.sun.management.OperatingSystemMXBean bean = (com.sun.management.OperatingSystemMXBean) java.lang.management.ManagementF