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Create WAR - found duplicate org.json objects [message #1848579]

Wed, 08 December 2021 09:21

Eclipse User

Hi.

In my project "tracetickets" I use the org.json library to parse text in json format.

By creating war I receive this error message:

[INFO] --- duplicate-finder-maven-plugin:1.4.0:check (default) @ tracetickets.ui.html ---
[INFO] Checking compile classpath
[INFO] Checking runtime classpath
[INFO] Checking test classpath
[WARNING] Found duplicate and different classes in [org.eclipse.scout.rt:org.eclipse.scout.json:11.0.36, org.json:json:20210307]:
[WARNING]   org.json.JSONArray
[WARNING]   org.json.JSONException
[WARNING]   org.json.JSONObject
[WARNING]   org.json.JSONStringer
[WARNING]   org.json.JSONTokener
[WARNING] Found duplicate classes/resources in compile classpath.
[WARNING] Found duplicate and different classes in [org.eclipse.scout.rt:org.eclipse.scout.json:11.0.36, org.json:json:20210307]:
[WARNING]   org.json.JSONArray
[WARNING]   org.json.JSONException
[WARNING]   org.json.JSONObject
[WARNING]   org.json.JSONStringer
[WARNING]   org.json.JSONTokener
[WARNING] Found duplicate classes/resources in runtime classpath.
[WARNING] Found duplicate and different classes in [org.eclipse.scout.rt:org.eclipse.scout.json:11.0.36, org.json:json:20210307]:
[WARNING]   org.json.JSONArray
[WARNING]   org.json.JSONException
[WARNING]   org.json.JSONObject
[WARNING]   org.json.JSONStringer
[WARNING]   org.json.JSONTokener
[WARNING] Found duplicate classes/resources in test classpath.
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] TraceTickets Parent Module ......................... SUCCESS [ 27.910 s]
[INFO] TraceTickets Shared ................................ SUCCESS [ 15.339 s]
[INFO] TraceTickets Server ................................ SUCCESS [  4.704 s]
[INFO] TraceTickets Client ................................ SUCCESS [ 18.465 s]
[INFO] TraceTickets Server Application .................... SUCCESS [  4.487 s]
[INFO] TraceTickets Server Application (Development) ...... SUCCESS [  5.019 s]
[INFO] TraceTickets HTML UI ............................... FAILURE [03:32 min]
[INFO] TraceTickets HTML UI Application ................... SKIPPED
[INFO] TraceTickets HTML UI Application (Development) ..... SKIPPED
[INFO] TraceTickets ROOT Module 1.0.0-SNAPSHOT ............ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 04:49 min
[INFO] Finished at: 2021-12-08T15:20:09+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.basepom.maven:duplicate-finder-maven-plugin:1.4.0:check (default) on project tracetickets.ui.html: Found duplicate classes/resources! -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.basepom.maven:duplicate-finder-maven-plugin:1.4.0:check (default) on project tracetickets.ui.html: Found duplicate classes/resources!

I tried to edit "tracetickets/pom.xml":

<dependencyManagement>
    <dependencies>
      ..........
      <dependency>
        <groupId>org.eclipse.scout.rt</groupId>
        <artifactId>org.eclipse.scout.rt</artifactId>
        <version>${org.eclipse.scout.rt.version}</version>
        <type>pom</type>
        <scope>import</scope>
         <exclusions>
        	<exclusion>
    	    	<groupId>org.json</groupId>
			    <artifactId>json</artifactId>
        	</exclusion>
        </exclusions>
     </dependency>

But this has no effect.

Can anyone please advise me where I am making a mistake?

Thank you.

[Updated on: Wed, 08 December 2021 09:23] by Moderator

Re: Create WAR - found duplicate org.json objects [message #1848583 is a reply to message #1848579]

Wed, 08 December 2021 11:41

Eclipse User

Hi Miloslav

Excluding one of the duplicates is the right approach.
But you don't have to declare the exclusion in the dependency import.

Such an import actually does not declare a real dependency. It only imports the dependency-management from scout so that all the versions of the scout dependencies are already defined. So it won't help if you place your exclusion there.

Instead you have to track down the dependency in one of your poms that introduces (contributes) org.json:json. You can e.g. do that by computing the dependency tree for the affected module. There you can see from where the org.json:json dependency is coming. And at the place this root dependency is declared in your poms you have to add your exclusion.

Hope this helps
Mat

Re: Create WAR - found duplicate org.json objects [message #1848625 is a reply to message #1848579]

Fri, 10 December 2021 03:26

Eclipse User

Just a quick addendum:

The org.json classes are used by the Scout UI layer as a lightweight way to parse and serialize JSON messages between the browser and the UI server. Since the license of the original org.json implementation is somewhat unclear and is generally considered "non-free", we replaced it with a clean room re-implementation done by the Google Android team. It is released under the Apache License and can therefore safely be used by Eclipse Scout. The re-implementation is mostly compatible with the original library. Because Google did not build a separate library we took the relevant files and bundled them in a separate maven module.

You can find more information in the readme file:
https://github.com/eclipse-scout/scout.rt/tree/releases/11.0/org.eclipse.scout.json

Regards,
Beat

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