Java’s Throwable class (in the java.lang package) provides methods to print a stack trace, fill in a stack trace, and access a stack trace’s elements.

To solve these problems, Java embraced a new approach to exception handling. In Java, we combine objects that describe exceptions with a mechanism based on throwing and catching these objects.

By declaring that a method throws java.lang.Exception, all the issues in Listing A are forced upon the API users, so they can't deal with exceptions professionally.