Resolve violations of IDEA inspections 2020.1.1

Violations: https://teamcity.jetbrains.com/buildConfiguration/Checkstyle_ContributionIdeaInspectionsPullRequest/3854536?buildTab=Inspection

Java/Abstraction issues
['public' method with 'boolean' parameter (Errors) (1)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Code maturity
[Deprecated API usage (Errors) (1)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
[Use of System.out or System.err (Errors) (7)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/JUnit
[JUnit test method without any assertions (Errors) (25)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Naming conventions/Method
[Method naming convention (Errors) (1)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Performance
[StringBuilder without initial capacity (Errors) (1)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Portability
[Call to 'System.exit()' or related methods (Errors) (1)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Probable bugs
[Use of Properties object as a Hashtable (Errors) (6)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
Java/Resource management
[AutoCloseable used without 'try'-with-resources (Errors) (7)](https://teamcity.jetbrains.com/viewLog.html?tab=Inspection&buildId=3854536&embedded=true#)
I/O resource opened but not safely closed (4)
Java/Verbose or redundant code constructs
Stream API call chain can be simplified (2)

Start with the linked TeamCity inspection report for build 3854536 and use its findings to locate the affected Java sources and tests. Address the listed inspection violations, including resource handling, assertions, deprecated APIs, and output calls, then rerun the inspection to confirm the violations are resolved.

Written by the indexing model from the issue text.