Runtime Issues When Running Mixed Scala and Java Code in Zingg Project Within Scala IDE

Hi! we are trying to debug the zingg source code, while encountering with the integration of Scala and Java in zingg project within the Scala IDE. There are no compilation errors due to the mixed compilation features of the Scala IDE, but we are facing a problem when running the project. Specifically, when Scala and Java code are interdependent—such as when Java files import Scala classes or packages—we encounter runtime issues. I would be thankful if you could give me some insights. Thank you!