How to block 2 users on the same screen - JAVA

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I need to block the access of 2 people on the same screen, for example, two people try to access the registration of a certain product, the second person trying to enter must receive a warning that someone is accessing this register. Anyone have any ideas? I work with java, jsf, primefaces and hibernate.

    
asked by anonymous 06.07.2018 / 17:56

0 answers