Properly resolve issues in java/spotbugs-exclude.xml

[dsgrieve]

Describe the bug The bug patterns being excluded in java/spotbugs-exlude.xml should be addressed in the code.

To Reproduce Steps to reproduce the behavior:

1. checkout the experimental-java branch
2. cd java
3. ./mvnw clean verify -Pbug-check

Expected behavior There should not be a spotbugs-exclude.xml. We should not get any spotbugs errors when compiling with -Pbug-check. NOTE: This isn't entirely true. There may be issues that we just cannot resolve, or we may know better than spotbugs.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. Windows]
• IDE: [e.g. Visual Studio, VS Code]
• NuGet Package Version [e.g. 0.1.0]

Additional context Add any other context about the problem here.