doesn't compile: sparkjava exception handling

Question

I am trying to follow the sparkjava exception handling example located here, without success: http://sparkjava.com/documentation.html#exception-mapping. It appears the code they posted isn't quite right? I was able to fix one of the posted methods so that it compiles. The method on the documentation page which doesn't compile was:

get("/throwexception", (request, response) -> {
    throw new NotFoundException();
});

I changed to this code and it compiles:

    get(new Route("/throwexception") {
        @Override
        public Object handle(Request request, Response response)  {
            throw new IllegalArgumentException();
        }
    });

However, I am unable to get this method to compile. What is wrong? I am using java 8 and IntelliJ community edition 15.0.2 to compile. My java module is set to language level 8. Here is the suspect method:

    exception(Exception.class, (e, request, response) -> {
        //TODO: implement this after it compiles.
    });

Here is the error I get from the compiler:

Error:(83, 9) java: cannot find symbol
  symbol:   method exception(java.lang.Class<java.lang.Exception>,(e,request[...]->{ })
  location: class org.me.JournalController

To confirm that I really am using java 8, this example using a lambda expression does compile:

public class Lambdas {
    public static void main(String[] args) throws Exception {
        new Lambdas().start();
        Thread.sleep(1000);
    }

    public void start(){
        Interface f = () -> System.out.println("test");
    }
}

Gavriel · Accepted Answer · 2016-01-23 22:39:23Z

1

The original code uses lambda expressions, you should use Java 8 to compile it.

answered Jan 23, 2016 at 22:39

Gavriel

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6 Comments

thebiggestlebowski Over a year ago

I believe I'm using java jdk 1.8.0_66. I can see in the project configuration this is what I have selected. Also, my module has language level 8. Could it be something else?

thebiggestlebowski Over a year ago

java version "1.8.0_66" Java(TM) SE Runtime Environment (build 1.8.0_66-b17) Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)

Gavriel Over a year ago

do you have import static spark.Spark.*; at the beginning of your file?

Gavriel Over a year ago

sorry, I'm out of ideas :(

thebiggestlebowski Over a year ago

I updated the question. I tried a class with a lambda expression and it does compile ... I suspect you're onto something ... I probably don't have spark configured correctly. Not sure what I might be missing. I'll add my maven code.

|

thebiggestlebowski · Accepted Answer · 2016-01-24 12:23:55Z

1

My maven file had sparkjava dependency listed twice. I think my IDE automatically imported 1.1.1 for me at some point and I didn't realize it. I had 1.1.1 and 2.3. When I removed the outdated 1.1.1 sparkjava dependency then everything works as expected.

edited Jan 24, 2016 at 12:23

answered Jan 24, 2016 at 0:42

thebiggestlebowski

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Comments

AlexC · Accepted Answer · 2016-01-28 20:22:01Z

0

You can extract your throw statement into a function:

get("/throwexception", () -> BlowUp());

(snip)

public static void BlowUp()
{
    throw new NotFoundException();
});

answered Jan 28, 2016 at 20:22

AlexC

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1 Comment

thebiggestlebowski Over a year ago

I had that originally. I modified to try to fix the compilation error which was caused by maven dependency problems. Thanks for the suggestion, though ;)

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