ContextHandler(anyHandler) NPE during .<init> logging 'because "this._vhosts" is null'

Jetty version(s) 12.0.5

Jetty Environment core

Java version/vendor openjdk version "21.0.1" 2023-10-17 OpenJDK Runtime Environment (build 21.0.1+12-29)

Mac OS Big Sur

Description ContextHandler(anyHandler) NPE during . logging call 'because "this._vhosts" is null'

Happens in the constructor when given any handler, including several examples from Jetty 12 docs.

Does not happen if handler is omitted, i.e. new ContextHandler()

How to reproduce?

  public static void main(String[] args) throws Exception {
    ContextHandler simpleContextHandler = new ContextHandler(new Handler.Abstract.NonBlocking() {
      @Override
      public boolean handle(Request request, Response response, Callback callback){
          callback.succeeded();
          return true;
      }
    });
  }

IDE: Eclipse 23, configured via maven dependencies

VM arguments:

-DJETTY_HOME=/Users/bill/Documents/workspace/worktracks -- this is irrelevant

Log/Stacktrace:

SLF4J(E): Failed toString() invocation on an object of type [org.eclipse.jetty.server.handler.ContextHandler]
SLF4J(E): Reported exception:
java.lang.NullPointerException: Cannot invoke "java.util.List.stream()" because "this._vhosts" is null
    at org.eclipse.jetty.server.handler.ContextHandler.getVirtualHosts(ContextHandler.java:391)
    at org.eclipse.jetty.server.handler.ContextHandler.toString(ContextHandler.java:1032)
    at org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:291)
    at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:263)
    at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:225)
    at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:160)
    at ch.qos.logback.classic.spi.LoggingEvent.getFormattedMessage(LoggingEvent.java:397)
    at ch.qos.logback.classic.spi.LoggingEvent.prepareForDeferredProcessing(LoggingEvent.java:253)
    at ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:226)
    at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:102)
    at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:85)
    at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51)
    at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:272)
    at ch.qos.logback.classic.Logger.callAppenders(Logger.java:259)
    at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:426)
    at ch.qos.logback.classic.Logger.filterAndLog_2(Logger.java:419)
    at ch.qos.logback.classic.Logger.debug(Logger.java:495)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.addBean(ContainerLifeCycle.java:419)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.addBean(ContainerLifeCycle.java:317)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.updateBean(ContainerLifeCycle.java:802)
    at org.eclipse.jetty.server.Handler$Singleton.updateHandler(Handler.java:397)
    at org.eclipse.jetty.server.Handler$Wrapper.<init>(Handler.java:695)
    at org.eclipse.jetty.server.Handler$Wrapper.<init>(Handler.java:682)
    at org.eclipse.jetty.server.handler.ContextHandler.<init>(ContextHandler.java:177)
    at org.eclipse.jetty.server.handler.ContextHandler.<init>(ContextHandler.java:167)
    at worktrack.WorktracksServer.main(WorktracksServer.java:41)

Imports:

package mypackage;

import java.io.File;
import java.io.FileNotFoundException;
import java.time.Instant;

import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.io.Content;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.HttpConfiguration;
import org.eclipse.jetty.server.HttpConnectionFactory;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.server.SecureRequestCustomizer;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.SslConnectionFactory;
import org.eclipse.jetty.util.Callback;
//import org.eclipse.jetty.http2.server.HTTP2CServerConnectionFactory
import org.eclipse.jetty.util.resource.ResourceFactory;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.server.handler.SecuredRedirectHandler;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.DefaultHandler;
import java.util.List;

jetty / jetty.project

ContextHandler(anyHandler) NPE during .<init> logging 'because "this._vhosts" is null' #11220