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The instance is set during initialization, when concurrent access is not an issue, because the environment guarantees that the init() method will only be called once. Thereafter, this instance is immutable, and therefore safe to be accessed by multiple threads at the same time. Of primary concern is the member containing the information to be reported, trafficReports. Hashtable. Unless you are familiar with that class, it is not apparent that the instance is being protected. The answer is simply that the get() and put() methods are synchronized.

The complete servlet code is reproduced below. close(); } } Extra information is now required and it must be retrieved via different means. It is no longer appropriate to use an instance of Hashtable to store the reports. Instead, an individual report is stored in an instance of class TrafficReport. The report contains instance variables for the street, vicinity, time of creation, and description, that is, the report itself. As the TrafficReport instances are stored in a linked list, there is also a next field that refers to the next TrafficReport.

The first consumer enters the get() method and calls wait(). Before the producer calls put(), the other consumer calls get(). Remember that the object is available because the first consumer is blocked. The second consumer is then blocked, as well. Both consumers will unblock when a producer calls notifyAll(), but one will immediately block again, because the method is synchronized, and only one thread at a time can obtain execution rights. When the second consumer is able to proceed, it cannot read the contents field without first checking the available flag, even though it has checked it previously.

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