Application with hard-coded IP addresses can become impossible to deploy in some cases. Externalizing IP adresses is preferable. AvoidUsingHardCodedIP (Priority: 3, Ruleset: Best Practices) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_bestpractices.html#avoidusinghardcodedip

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 3, Ruleset: Error Prone) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_errorprone.html#emptycatchblock

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 3, Ruleset: Error Prone) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_errorprone.html#emptycatchblock

Application with hard-coded IP addresses can become impossible to deploy in some cases. Externalizing IP adresses is preferable. AvoidUsingHardCodedIP (Priority: 3, Ruleset: Best Practices) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_bestpractices.html#avoidusinghardcodedip

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 3, Ruleset: Error Prone) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_errorprone.html#emptycatchblock

Useless parentheses should be removed. UselessParentheses (Priority: 4, Ruleset: Code Style) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_codestyle.html#uselessparentheses

Empty Catch Block finds instances where an exception is caught, but nothing is done. In most circumstances, this swallows an exception which should either be acted on or reported. EmptyCatchBlock (Priority: 3, Ruleset: Error Prone) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_errorprone.html#emptycatchblock

Application with hard-coded IP addresses can become impossible to deploy in some cases. Externalizing IP adresses is preferable. AvoidUsingHardCodedIP (Priority: 3, Ruleset: Best Practices) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_bestpractices.html#avoidusinghardcodedip

Reports import statements that can be removed. They are either unused, duplicated, or the members they import are already implicitly in scope, because they're in java.lang, or the current package. UnnecessaryImport (Priority: 4, Ruleset: Code Style) https://pmd.github.io/pmd-6.49.0/pmd_rules_java_codestyle.html#unnecessaryimport