ErrorHandler fails to render exception if Exception.getMessage() returns null.

[bckfnn]

In snapshot vertx-apex-3.0.0-20150302.172251-43, an ErrorHandler with displayExceptionDetails=true will itself throw an exception when the orginal exception have a null getMessage().

SEVERE: Unexpected exception in route
java.lang.NullPointerException: reasonPhrase
    at io.netty.handler.codec.http.HttpResponseStatus.<init>(HttpResponseStatus.java:478)
    at io.netty.handler.codec.http.HttpResponseStatus.<init>(HttpResponseStatus.java:468)
    at io.vertx.core.http.impl.HttpServerResponseImpl.setStatusMessage(HttpServerResponseImpl.java:122)
    at io.vertx.ext.apex.handler.impl.ErrorHandlerImpl.handle(ErrorHandlerImpl.java:77)
    at io.vertx.ext.apex.handler.impl.ErrorHandlerImpl.handle(ErrorHandlerImpl.java:35)
    at io.vertx.ext.apex.impl.RouteImpl.handleFailure(RouteImpl.java:203)
    at io.vertx.ext.apex.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:65)
    at io.vertx.ext.apex.impl.RoutingContextImpl.next(RoutingContextImpl.java:98)
    at io.vertx.ext.apex.impl.RoutingContextImpl.doFail(RoutingContextImpl.java:290)
    at io.vertx.ext.apex.impl.RoutingContextImpl.fail(RoutingContextImpl.java:124)
    at io.vertx.ext.apex.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:73)
    at io.vertx.ext.apex.impl.RoutingContextImpl.next(RoutingContextImpl.java:98)
    at io.vertx.ext.apex.impl.RouterImpl.accept(RouterImpl.java:61)
    at dk.innovasion.support.ApexTest$$Lambda$8/105099923.handle(Unknown Source)
    at io.vertx.core.http.impl.ServerConnection.handleRequest(ServerConnection.java:262)
    at io.vertx.core.http.impl.ServerConnection.processMessage(ServerConnection.java:364)
    at io.vertx.core.http.impl.ServerConnection.handleMessage(ServerConnection.java:129)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:522)
    at io.vertx.core.http.impl.HttpServerImpl$ServerHandler.doMessageReceived(HttpServerImpl.java:453)
    at io.vertx.core.http.impl.VertxHttpHandler.lambda$channelRead$5(VertxHttpHandler.java:71)
    at io.vertx.core.http.impl.VertxHttpHandler$$Lambda$14/1054055130.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.lambda$wrapTask$3(ContextImpl.java:258)
    at io.vertx.core.impl.ContextImpl$$Lambda$4/1237598030.run(Unknown Source)
    at io.vertx.core.impl.ContextImpl.executeSync(ContextImpl.java:165)
    at io.vertx.core.http.impl.VertxHttpHandler.channelRead(VertxHttpHandler.java:71)
    at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:131)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:182)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
    at java.lang.Thread.run(Thread.java:744)

A reproducer:

package dk.innovasion.support;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.Vertx;
import io.vertx.core.http.HttpServer;
import io.vertx.core.http.HttpServerOptions;
import io.vertx.ext.apex.Router;
import io.vertx.ext.apex.handler.ErrorHandler;

public class ApexTest extends AbstractVerticle {
    @Override
    public void start() throws Exception {
        Router router = Router.router(vertx);

        router.route().path("/ok").handler(ctx -> {
            throw new NullPointerException("message"); 
        });

        router.route().path("/fail").handler(ctx -> {
            throw new NullPointerException(); 
        });
        router.route().failureHandler(ErrorHandler.create(true));

        HttpServerOptions options = new HttpServerOptions();
        options.setPort(8080);

        HttpServer server = vertx.createHttpServer(options);
        server.requestHandler(router::accept).listen();
    }

    public static void main(String[] args) {
        Vertx vertx = Vertx.vertx();

        vertx.deployVerticle(ApexTest.class.getName(), res -> {
            System.out.println(res.succeeded() + " " + res.cause());
        });
    }
}

Hitting localhost:8080/ok shows a nice stacktrace
Hitting localhost:8080/fail shows "Internal Server Error" and the cause exception stacktrace is lost.

[purplefox]

Should be fixed now.