This Java Test Suit is an example project to showcase the usage of white-box fuzz testing for developers. It contains examples for the usage as security issue as well as robustness issue detector.
As a general advise: Let the fuzzer not only control the inputs, but also the control flow to achieve the best possible results. Robustness/business-logic issues are best detected by testcases written the way of property based tests.
To execute the tests you can either use cifuzz (recommended) and/or CISense (recommended) or set the env variable JAZZER_FUZZ=1 and execute via mvn (not recommended).