NPE in AbstractHandlerMethodMapping when trace logging is enabled and a handler's class loader does not provide package information

[wilkinsona]

Affects: 5.1.4.RELEASE

In the unlikely event of trace logging being enabled and a handler's class having been loaded by a class loader that does not provide package information, Class.getPackage() will return null and the following line will NPE:

spring-framework/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java

Line 289 in 6bdf2c2

String formattedType = Arrays.stream(userType.getPackage().getName().split("\\."))

[jhoeller]

Good catch! I've also adapted the logger initialization code in DecoderHttpMessageReader and EncoderHttpMessageReader accordingly, avoiding Class.getPackage() in favor of ClassUtils.getPackageName(Class) or plain Class.getName() checks.