Remotely related to java :-)

How to run minecraft on your PC (Java version) - note, Java edition does not support cross platform:

https://www.h3xed.com/pc-gaming/start-a-minecraft-server-and-play-with-your-friends

To check your external ip:
https://www.whatismyip.com/

To check if your port is open:
https://www.yougetsignal.com/tools/open-ports/

Very good example on how to use enum maps

https://howtodoinjava.com/java/enum/java-enum-string-example/

A good example:
https://codereview.stackexchange.com/questions/46175/java-enum-containing-a-hash-map-for-look-up

Very good reference on using Jersey:
https://dennis-xlc.gitbooks.io/restful-java-with-jax-rs-2-0-en/cn/part1/chapter8/building_and_invoking_requests.html


Do note: need to do a string:
Response resp = invocationBuilder.post(Entity.entity(jsonObjectBody.toString(), MediaType.APPLICATION_JSON)); 

or else json
{"method":"Logon","payload":{"strLogin":"aaa_offers","strPassword":"gL(8KKw3L)\\\"g)BKR","elemParameters":{}},"schema":"xtk:session","securityToken":"","sessionToken":""}


will be converted to like NVP:

{

               "method": {

      "chars": "Logon",

      "string": "Logon",

      "valueType": "STRING"

    },

    "payload": {    

      "strLogin": {

        "chars": "aaa_offers",

        "string": "aaa_offers",

        "valueType": "STRING"

      },

      "strPassword": {

        "chars": "**** password here ****",

        "string": "**** password here ****",

        "valueType": "STRING"

      },

                 "elemParameters": {}

    },

    "schema": {

      "chars": "xtk:session",

      "string": "xtk:session",

      "valueType": "STRING"

    },

    "securityToken": {

      "chars": "",

      "string": "",

      "valueType": "STRING"

    },

    "sessionToken": {

      "chars": "",

      "string": "",

      "valueType": "STRING"

    }

  }

Jersey Logging

Not easy to do with Jersey 2 but here's a good one to start with:
https://www.javaguides.net/2018/06/jersey-rest-logging-using-loggingfeature.html

And here is how to bridge it to log4j:
https://stackoverflow.com/questions/15437043/how-to-use-log4j-to-see-into-jersey

https://xiaozhoutech.wordpress.com/2013/08/02/log4j-working-on-jersey/

http://jersey.576304.n2.nabble.com/Enable-Logging-td7581002.html


OK folks, this one works:
https://www.logicbig.com/tutorials/misc/java-logging/jul-to-slf4j-log4j2.html

Will post code later

Getting started on Maven

Trying this out now, coz I realised this is the easiest way to ensure I am using the latest jars that I need for my development work.

See this for starters: https://www.vogella.com/tutorials/EclipseMaven/article.html

If you get the error "maven could not resolve archetype", try the suggestions in these 2 links:
https://stackoverflow.com/questions/15506043/create-a-maven-project-in-eclipse-complains-could-not-resolve-archetype
https://stackoverflow.com/questions/18499931/eclipse-java-ee-new-maven-project-could-not-resolve-archetype

To setup Eclipse with M2E:

Way 1: Maven Eclipse plugin installation step by step:

1. Open Eclipse IDE
2. Click Help -> Install New Software...
3. Click Add button at top right corner
4. At pop up: fill up Name as "M2Eclipse" and Location as "http://download.eclipse.org/technology/m2e/releases" or http://download.eclipse.org/technology/m2e/milestones/1.0
5. Now click OK

After that installation would be started.

Way 2: Another way to install Maven plug-in for Eclipse by "Eclipse Marketplace":

1. Open Eclipse
2. Go to Help -> Eclipse Marketplace
3. Search by Maven
4. Click "Install" button at "Maven Integration for Eclipse" section
5. Follow the instruction step by step

After successful installation do the followings in Eclipse:

1. Go to Window --> Preferences
2. Observe, Maven is enlisted at left panel

Finally,

1. Click on an existing project
2. Select Configure -> Convert to Maven Project