codegen/src/main/java/software/amazon/awssdk/codegen/poet/rules/EndpointProviderSpec.java [384:399]:
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    private CodeBlock validateRequiredParams() {
        CodeBlock.Builder b = CodeBlock.builder();

        Map<String, ParameterModel> parameters = intermediateModel.getEndpointRuleSetModel().getParameters();
        parameters.entrySet().stream()
                  .filter(e -> Boolean.TRUE.equals(e.getValue().isRequired()))
                  .forEach(e -> {
                      b.addStatement("$T.notNull($N.$N(), $S)",
                                     Validate.class,
                                     "endpointParams",
                                     endpointRulesSpecUtils.paramMethodName(e.getKey()),
                                     String.format("Parameter '%s' must not be null", e.getKey()));
                  });

        return b.build();
    }
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codegen/src/main/java/software/amazon/awssdk/codegen/poet/rules2/EndpointProviderSpec2.java [185:199]:
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    private CodeBlock validateRequiredParams() {
        CodeBlock.Builder b = CodeBlock.builder();
        Map<String, ParameterModel> parameters = intermediateModel.getEndpointRuleSetModel().getParameters();
        parameters.entrySet().stream()
                  .filter(e -> Boolean.TRUE.equals(e.getValue().isRequired()))
                  .forEach(e -> {
                      b.addStatement("$T.notNull($N.$N(), $S)",
                                     Validate.class,
                                     "params",
                                     endpointRulesSpecUtils.paramMethodName(e.getKey()),
                                     String.format("Parameter '%s' must not be null", e.getKey()));
                  });

        return b.build();
    }
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