scim-server-examples/scim-server-jersey/src/main/java/org/apache/directory/scim/example/jersey/service/InMemoryGroupService.java [91:133]:
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      resource.setExternalId(resource.getDisplayName());
    }

    // check to make sure the group doesn't already exist
    boolean existingGroupFound = groups.values().stream()
      .anyMatch(group -> resource.getExternalId().equals(group.getExternalId()));
    if (existingGroupFound) {
      // HTTP leaking into data layer
      throw new UnableToCreateResourceException(Response.Status.CONFLICT, "Group '" + resource.getExternalId() + "' already exists.");
    }

    resource.setId(id);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup update(String id, Set<ETag> etags, ScimGroup resource, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup patch(String id, Set<ETag> etags, List<PatchOperation> patchOperations, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    ScimGroup resource = patchHandler.apply(get(id), patchOperations);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup get(String id) {
    return groups.get(id);
  }

  @Override
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scim-server-examples/scim-server-spring-boot/src/main/java/org/apache/directory/scim/example/spring/service/InMemoryGroupService.java [85:127]:
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      resource.setExternalId(resource.getDisplayName());
    }

    // check to make sure the group doesn't already exist
    boolean existingGroupFound = groups.values().stream()
      .anyMatch(group -> resource.getExternalId().equals(group.getExternalId()));
    if (existingGroupFound) {
      // HTTP leaking into data layer
      throw new UnableToCreateResourceException(Response.Status.CONFLICT, "Group '" + resource.getExternalId() + "' already exists.");
    }

    resource.setId(id);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup update(String id, Set<ETag> etags, ScimGroup resource, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup patch(String id, Set<ETag> etags, List<PatchOperation> patchOperations, Set<AttributeReference> includedAttributeReferences, Set<AttributeReference> excludedAttributeReferences) throws ResourceException {
    if (!groups.containsKey(id)) {
      throw new ResourceNotFoundException(id);
    }

    ScimGroup resource = patchHandler.apply(get(id), patchOperations);
    groups.put(id, resource);
    return resource;
  }

  @Override
  public ScimGroup get(String id) {
    return groups.get(id);
  }

  @Override
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