open-dis / diswebgateway Goto Github PK

Any chance you can provide an example of using dis.SetDataPdu with some variable data records.

This code works in GraalVM.

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class Foo {
     static public void main(String [] args) {

     try
      {
        ScriptEngineManager factory = new ScriptEngineManager();
        ScriptEngine engine = factory.getEngineByName("nashorn");

        engine.eval("print('Hello, World')");

      }
      catch(Exception e)
      {
          System.out.println(e);
      }

        }
}

================================================================

This code does not work in DISWebGateway. Can i get a Java version # when running the run target under ant?

$ sudo ant run

This is a Linux 5.8 system.

See below

On 2/21/21 9:53 PM, John Carlson wrote:

I've been trying to get open-dis' DISWebGateway running, and got the following script issue. I think it's because OpenJDK does not use a scripting engine like Nashorn.

I will likely move to GraalVM if there are no other solutions.

run:
[java] Loaded configuration properties
[java] class edu.nps.moves.gateway.Configuration
[java] SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
[java] SLF4J: Defaulting to no-operation (NOP) logger implementation
[java] SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[java] Started DIS listening on UDP port 1194
[java] Configured to not use redis server
[java] Starting websocket server on TCP port 8282
[java] Starting https server on TCP port 443
[java] WebSocket Opened
[java] java.lang.NullPointerException: Cannot invoke "javax.script.ScriptEngine.eval(String)" because "engine" is null
[java] WebSocket Closed. Code:1011 Reason:WebSocketException
[java] WebSocket Opened
[java] java.lang.NullPointerException: Cannot invoke "javax.script.ScriptEngine.eval(String)" because "engine" is null
[java] WebSocket Closed. Code:1011 Reason:WebSocketException

I have an instance of this running in a Docker container. I modified the src in Configuration.java in my copy so that the ports are configurable. Maybe this is something you could add or allow me to submit a PR if it is useful to others? Thanks.

Here's the gist:

String webserverPort = settings.getProperty("webserverPort");
String httpsWebserverPort= settings.getProperty("httpsWebserverPort");

// Overrides the default ports if the ENV VARS exist
if ( System.getenv("HTTP_WEBSERVER_PORT") != null )
{
   webserverPort = System.getenv("HTTP_WEBSERVER_PORT");
}
if ( System.getenv("HTTPS_WEBSERVER_PORT") != null )
{
   httpsWebserverPort = System.getenv("HTTPS_WEBSERVER_PORT");
}

HTTP_WEBSERVER_PORT = Integer.parseInt(webserverPort);
HTTPS_WEBSERVER_PORT = Integer.parseInt(httpsWebserverPort);](url)```

https://github.com/coderextreme/DISWebGateway/ You can do a pull request to see my changes, mostly to use GraalJS instead of Nashorn.

Please integrate my GraalJS changes. Feel free to grab your own version of GraalJS jars

Note that there are still issues with the WebSocket being closed??? I'm not sure if it should be closed or not?

Thanks!

John