我在windows下安装好oracle后，访问EM管理器,用sys登陆进去后报java.lang.Exception: Exception in sending Request :: null这个错，这是什么原因啊？网上查资料说是时区的问题，可我的时区没有问题啊，请高手指教 ...

Each JVM thread (a path of execution) is associated with a stack that’s created when the thread is created. This data structure is divided into frames, which are data structures associated with method ...

Some exceptions in Java must be handled in the developer's code. Other exceptions can occur without any exception handling semantics at all. When an exception must be handled with try-and-catch ...

Java’s compile-time checking does a pretty good job of keeping exceptions safely caged—you can’t call a method that throws a checked exception without catching the exception or declaring that your own ...