I make this call to a static singleton instance from the class GameManager.java
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HUD.getInstance().update(timeDelta);
HU
I was having the same problem except that I was importing the classes for which dependencies were not resolving somehow. I refreshed maven projects, Rebuild Project. It still did not resolve. Looks like IntelliJ was caching something incorrectly. I restarted IntelliJ and that resolved the dependencies. I guess it cleared the cache somehow.