Kris Hollenbeck Kris Hollenbeck -4 years ago 225
Java Question

Java Spark Framework, How do I start it?

This seems like it should be a trivial task. But I can't quite figure out what I am suppose to do. I am new to Maven/Spark. And after searching around, looking thorough the docs and what not. I can't figure out how to start my spark application?

I followed this guide to get set up in Intellij.
https://sparktutorials.github.io/2015/04/02/setting-up-a-spark-project-with-maven.html

I can run all of the maven tasks, except deploy.

enter image description here

Deploy fails with this error.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy (default-deploy) on project framework: Deployment failed: repository element was not specified in the POM inside distributionManagement element or in -DaltDeploymentRepository=id::layout::url parameter -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.


I am not sure if that matters or not? Is deploy the task intended to start the server? I am not sure.

POM.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.krishollenbeck.framework</groupId>
<artifactId>framework</artifactId>
<version>1.0</version>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.sparkjava</groupId>
<artifactId>spark-core</artifactId>
<version>2.5</version>
</dependency>
</dependencies>
</project>


This is what the DOCS say.


What about starting the server? The server is automatically started
when you do something that requires the server to be started (i.e.
declaring a route or setting the port). You can also manually start
the server by calling init().


http://sparkjava.com/documentation.html#stopping-the-server

Okay? What does that mean? Normally there is some command or something to start a server.

Question: TL;DR

How do I start the spark server?

Additional sort of off topic:

Is spark still maintained? Is this a bad framework to use? I am looking for a light weight java server. Most of the app logic will be handled client side. Just need to handle some basic login/ CRUD stuff on the server side. And constructing some restful API.

Answer Source

RUN your main class from Intellij. OR, if you want to run it with maven do this:

mvn exec:java -Dexec.mainClass=my.IakaMain

and make sure you change my.IakaMain with yourpackage.YourClassName

Or run via Intellij Debug Configuration: (like so)

enter image description here

Run and view: (please note the port number is not the usual 80 or 8080)

http://localhost:4567/hello

Note: If you get this error.

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

Add this to your pom.xml

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.7.21</version>
</dependency>
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