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Java

Posted by Patrick Bluth
Patrick Bluth
13,285 Points

500 Internal Error - NotFoundException

Hi everyone I'm working on the Intro to Java Web Development With Spark course, and I've hit a little roadblock. Specifically on the "details" video.

I have everything running for the voting system until I actually need to vote. The page redirects to the slug link (ex voting for example goes to http://localhost:4567/ideas/%20example/votehttp://localhost:4567/ideas/%20example/vote) and I get the error. Not sure why it's not redirecting to the /ideas page again

[Thread-0] INFO org.eclipse.jetty.util.log - Logging initialized @381ms
[Thread-0] INFO spark.webserver.JettySparkServer - == Spark has ignited ...
[Thread-0] INFO spark.webserver.JettySparkServer - >> Listening on 0.0.0.0:4567
[Thread-0] INFO org.eclipse.jetty.server.Server - jetty-9.3.2.v20150730
[Thread-0] INFO org.eclipse.jetty.server.ServerConnector - Started ServerConnector@186b9aa{HTTP/1.1,[http/1.1]}{0.0.0.0:4567}
[Thread-0] INFO org.eclipse.jetty.server.Server - Started @614ms
[qtp13384719-18] ERROR spark.webserver.MatcherFilter - 
com.teamtreehouse.courses.model.NotFoundException
    at com.teamtreehouse.courses.model.SimpleCourseIdeaDAO$$Lambda$14/21507372.get(Unknown Source)
    at java.util.Optional.orElseThrow(Optional.java:290)
    at com.teamtreehouse.courses.model.SimpleCourseIdeaDAO.findBySlug(SimpleCourseIdeaDAO.java:30)
    at com.teamtreehouse.courses.Main.lambda$main$7(Main.java:68)
    at com.teamtreehouse.courses.Main$$Lambda$8/12609085.handle(Unknown Source)
    at spark.RouteImpl$1.handle(RouteImpl.java:58)
    at spark.webserver.MatcherFilter.doFilter(MatcherFilter.java:162)
    at spark.webserver.JettyHandler.doHandle(JettyHandler.java:61)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
    at org.eclipse.jetty.server.Server.handle(Server.java:517)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:302)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:245)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
    at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
    at java.lang.Thread.run(Thread.java:745)

Snippet from main class

        post("/ideas/:slug/vote", (req, res) -> {
            CourseIdea idea = dao.findBySlug(req.params("slug"));
            idea.addVoter(req.attribute("username"));
            res.redirect("/");
            return null;
        });
    }

Slug from SimpleCourseIdeaDAO

    @Override
    public CourseIdea findBySlug(String slug) {
        return ideas.stream()
                .filter(idea -> idea.getSlug().equals(slug))
                .findFirst()
                .orElseThrow(NotFoundException::new);
    }
}

NotFoundException Class

public class NotFoundException extends RuntimeException{
}

ideas.hbl file

    <ul>
        {{#each ideas}}
            <li>
                <form action="/ideas/ {{ slug }}/vote" method="post">
                    {{ title }}( {{ voteCount }} votes) <button>Vote</button>
                </form>
            </li>
        {{/each}}
    </ul>

I think that's all I need...

1 Answer

David Remington
David Remington
18,326 Points

Can you please try removing the space between the '/' character and the {{ slug }} in your ideas.hbl file like so:

<form action="/ideas/{{ idea.slug }}/vote" method="post">
        <button>Vote</button>
</form>

The '%20' you are seeing in your path is the url encoded character for a space and I have a suspicion that might be causing the Main class to not recognize what route you are actually on.

Patrick Bluth
Patrick Bluth
13,285 Points

Awesome David! Thank you so much! Its working fine now. I spent hours looking for that little error. I really appreciate your help!