When a properties file is created and used in the code to read from it, it's not working and throws an error. Below is the error:

ERROR : bundle igb:10.1.0 (40)[com.affymetrix.igb.prefs.IgbPreferencesLoadingOrchestrator(44)] : The activate method has thrown an exception
java.util.MissingResourceException: Can't find bundle for base name ucsc, locale en_US
at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2059)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1697)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1600)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1555)
at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:861)
at org.lorainelab.igb.ucsc.rest.api.service.UCSCRestApiDataProvider.<init>(UCSCRestApiDataProvider.java:39)

Also, observed this error log for testcases in few modules:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.