is an that logs uncaught exceptions using SLF4J is a Dropwizard bundle that installs on startup When a thread is about to terminate due to an uncaught exception the Java Virtual Machine will query the thread for its UncaughtExceptionHandler using Thread getUncaughtExceptionHandler and will invoke the handler s uncaughtException method passing the thread and the exception as arguments When an uncaught exception is thrown logs the exception at the WARN level With logback configuration like this The logs look like this Slf4jUncaughtExceptionHandler UncaughtExceptionHandler Slf4jUncaughtExceptionHandlerBundle Slf4jUncaughtExceptionHandler Slf4jUncaughtExceptionHandler <appender name Console class ch qos logback core ConsoleAppender > <encoder> <pattern>%highlight % 5level %cyan %date HH mm ss SSS $ LOGGING_TIMEZONE %gray %file %line %white %thread %blue %marker %magenta %mdc %green %logger %message%n%rootException< pattern> < encoder> < appender> WARN 12 00 00 000 Slf4jUncaughtExceptionHandler java 46 main exceptionClass io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest RootException liftwizard error message example root liftwizard error kind io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest RootException threadName main exceptionMessage example root liftwizard error thread main io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandler Exception in thread main io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest$CauseException example cause at io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest testUncaughtException Slf4jUncaughtExceptionHandlerTest java 26 ~ test classes na 68 common frames omitted Wrapped by io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest$RootException example root at io liftwizard logging slf4j uncaught exception handler Slf4jUncaughtExceptionHandlerTest testUncaughtException Slf4jUncaughtExceptionHandlerTest java 27 ~ test classes na

To use the exception handler with Dropwizard add to the list of registered bundles And add the dependency Slf4jUncaughtExceptionHandlerBundle @Override public void initialize Bootstrap<HelloWorldConfiguration> bootstrap bootstrap addBundle new Slf4jUncaughtExceptionHandlerBundle <dependency> <groupId>io liftwizard< groupId> <artifactId>liftwizard bundle logging uncaught exception handler< artifactId> < dependency>

To use without the bundle create an instance and set it as the default uncaught exception handler And add the dependency Slf4jUncaughtExceptionHandler Thread setDefaultUncaughtExceptionHandler new Slf4jUncaughtExceptionHandler <dependency> <groupId>io liftwizard< groupId> <artifactId>liftwizard logging uncaught exception handler< artifactId> < dependency>