UnsupportedOperationException when updating document visibility

Hi there, As we discussed internally, this issue can be worked around by below code:

                   EslClient eslClient = new EslClient(API_KEY, API_URL);
                   DocumentVisibility documentVisibility = eslClient.getDocumentVisibility(new PackageId("NTrnQyLBKK5jwH1dyvGCqDcxZis="));

                   List configurations = documentVisibility.getConfigurations();
                   System.out.println("before: "+configurations.size());
                   
                   com.silanis.esl.sdk.DocumentVisibility visibility = newDocumentVisibility().build();
                   for (DocumentVisibilityConfiguration documentVisibilityConfiguration : configurations) {
                             visibility.addConfiguration(documentVisibilityConfiguration);
                   }
                   DocumentVisibilityConfiguration build = newDocumentVisibilityConfiguration("default-consent").withSignerIds(Arrays.asList("[email protected]")).build();
                   visibility.addConfiguration(build);
                   System.out.println("after: " + visibility.getConfigurations().size());
                   
                   //update through eslClient
                   eslClient.configureDocumentVisibility(new PackageId("NTrnQyLBKK5jwH1dyvGCqDcxZis="), visibility);

To elaborate the cause of issue, we can start from below example:

import static com.google.common.collect.Lists.transform;

           ArrayList arrayList = new ArrayList(){{add("line1");add("line2");}};
           List arrayList2 = transform(arrayList, new Function() {
            @Override
            public String apply(String oldString) {
                    return oldString+" - changed";
                }
            });
            arrayList2.add("try add");

This code snippet is very similar to the one in our SDK source code, which is used to transform API objects to SDK objects. And the transform function will return a list that doesn’t support “add” function. So if you ran this code, you will receive the same “java.lang.UnsupportedOperationException” exception. So in the real scenario, when client was trying to call .addConfiguration() function which internally call the list.add() function, it will yield the same error. Hope this could help! Duo