Multiple code improvements - squid:S1148, squid:HiddenFieldCheck, squid:S1066, squid:S1172

[georgekankava]

This pull request is focused on resolving occurrences of Sonar rules squid:S1148 - Throwable.printStackTrace(...) should not be called. squid:HiddenFieldCheck - Local variables should not shadow class fields. squid:S1066 - Collapsible "if" statements should be merged. squid:S1172 - Unused method parameters should be removed. You can find more information about the issue here: https://dev.eclipse.org/sonar/rules/show/squid:S1148 https://dev.eclipse.org/sonar/rules/show/squid:HiddenFieldCheck https://dev.eclipse.org/sonar/rules/show/squid:S1066 https://dev.eclipse.org/sonar/rules/show/squid:S1172 Please let me know if you have any questions. George Kankava