doubts in Java / JPA code

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I have a little project and I'm new to Java. I need to do a report search and this will consist of three tables in the database, until then the relationship is ok, but the question, how do I call this report?

I tried to use HashMap with JPA, but until then I could not, can anyone give a light?

Thank you

    
asked by anonymous 26.01.2018 / 14:44

0 answers