scim-server-examples/scim-server-quarkus/src/main/java/org/apache/directory/scim/example/quarkus/service/InMemoryUserService.java [128:142]:
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  public ScimUser create(ScimUser resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

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

    resource.setId(id);
    users.put(id, resource);
    return resource;
  }
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scim-server-examples/scim-server-spring-boot/src/main/java/org/apache/directory/scim/example/spring/service/InMemoryUserService.java [122:136]:
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  public ScimUser create(ScimUser resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

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

    resource.setId(id);
    users.put(id, resource);
    return resource;
  }
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scim-server-examples/scim-server-jersey/src/main/java/org/apache/directory/scim/example/jersey/service/InMemoryUserService.java [128:142]:
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  public ScimUser create(ScimUser resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

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

    resource.setId(id);
    users.put(id, resource);
    return resource;
  }
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scim-server-examples/scim-server-memory/src/main/java/org/apache/directory/scim/example/memory/service/InMemoryUserService.java [128:142]:
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  public ScimUser create(ScimUser resource) throws UnableToCreateResourceException {
    String id = UUID.randomUUID().toString();

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

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