how to compile and start a Java undertow HTTP server using command line

Question

I have the following project folder setup for a simple Java undertow HTTP server:

- HelloWorldServer.java

- build

- lib

I downloaded XNIO and JBOSS-Logging into lib. I made sure I downloaded the right distributions by letting Gradle download the dependencies. But I'm trying to understand more by running things manually so I copy the jar files into the lib folder.

My HelloWorldServer.java looks like this:

import io.undertow.Undertow;
import io.undertow.util.*;


public class HelloWorldServer {
public static void main(final String[] args) {
    Undertow server = Undertow.builder()
                              .addHttpListener(8080, "localhost")
                              .setHandler(exchange -> {
                                  exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                                  exchange.getResponseSender().send("Hello World");
                              }).build();
    server.start();
    }
}

Then I go to my folder root and run the following command:

javac -cp "lib/*" -d build HelloWorldServer.java

Now that I've compiled the application, how do I run it from terminal?

EDIT: the content of my lib directory is as follows:

hamcrest-core-1.3.jar // i believe thats not needed, but leave it anyway
jboss-logging-3.2.1.Final.jar
undertow-core-2.0.0.Alpha1.jar
xnio-api-3.3.6.Final.jar
xnio-nio-3.3.6.Final.jar

Answer 1

由于使用-d标志，您要求Java编译器在build目录中生成类文件，因此需要像这样运行：

java -cp "build/:lib/*" HelloWorldServer