NullPointerException when Log4J is loaded #2
Description
When I start my server and the System.Logger LOG4J bridge (org.apache.logging.log4j:log4j-jpl:2.22.1) is loaded, I get the following NPE:
java.lang.NullPointerException: Cannot invoke "java.util.logging.Logger.setFilter(java.util.logging.Filter)" because the return value of "java.util.logging.LogManager.getLogger(String)" is null
at robaho.net.httpserver.ServerImpl.<init>(ServerImpl.java:134)
at robaho.net.httpserver.HttpServerImpl.<init>(HttpServerImpl.java:43)
at robaho.net.httpserver.DefaultHttpServerProvider.createHttpServer(DefaultHttpServerProvider.java:35)
at jdk.httpserver/com.sun.net.httpserver.HttpServer.create(HttpServer.java:152)
at org.prelle.mud.websocket.WebsocketConnector.start(WebsocketConnector.java:125)When I remove all traces of the logging provider, it works.
The problem seems to be that LogManager.getLogger returns a null pointer because the Logger isn't known yet.
It might be better to use Logger.getLogger instead, because that method creates a named Logger if it does not exist yet.