No, the evaluation is a feature-complete 90-day trial of MapObjects-Java Edition. All classes and packages can be tested during the trial period. Therefore, any sample application you have created during the trial period should work. Any issues that arise before the 90-day timeout are not due to the trial status and should be investigated within the code created.
However, if there are issues running the JoViewPlus or Tutorial sample applications included with the trial, refer to the Related Information below for a possible solution.