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Go to private repository in browser (e.g. https://<PRIVATE_REG>:5000/v2/_catalog)
Download the certificate (e.g. View Cerificate > Details > Export (PEM format))

Copy crt certificate to: /usr/local/share/ca-certificates/

sudo update-ca-certificates --verbose

systemctl restart docker

Confirm it all works by trying to pull down a docker image from the private registry: 

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import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.List;

@Configuration
public class AppWebMvcConfiguration extends WebMvcConfigurerAdapter {

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from rx import Observable, Observer

letters = Observable.from_(['Alpha', 'Beta', 'Gamma', 'Delta', 'Epsilon'])

letters.subscribe(on_next=lambda s: print(s),
                  on_completed=lambda: print('Done'),
                  on_error=lambda e: print(e))

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from rx import Observable, Observer

letters = Observable.from_(['Alpha', 'Beta', 'Gamma', 'Delta', 'Epsilon']) \
    .map(lambda s: len(s)) \
    .filter(lambda i: i >= 5) \
    .subscribe(lambda i: print(i))

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from rx import Observable, Observer

Observable.interval(1000) \
    .map(lambda i: "{0} Mississippi".format(i))\
    .subscribe(lambda s: print(s))

input("Press any key to quit")

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import java.util.List;
import java.util.Random;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;

class TestRandomStringGenerator {
    private static Supplier<String> randomDischargeId = () -> RandomStringUtils.randomConsonant(8);

    public static void main(String[] args) {

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import java.util.Arrays;
import java.util.Random;
import java.util.function.Predicate;

public class BubbleSort {

    private static Random random = new Random();

    private Integer[] sort(Integer[] array, Predicate<Integer> sortType) {
        int count = 0;

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Function.prototype.method = function (name, func) {
    this.prototype[name] = func;
    return this;
};

Number.method('integer', function (  ) {
    return Math[this < 0 ? 'ceil' : 'floor'](this);
});

document.writeln((-10 / 3).integer(  ));  // −3

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Function.prototype.method = function (name, func) {
    this.prototype[name] = func;
    return this;
};

String.method('trim', function (  ) {
    return this.replace(/^\s+|\s+$/g, '');
});

document.writeln('"' + "   neat   ".trim(  ) + '"');

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import org.hibernate.validator.constraints.NotEmpty;
import org.junit.BeforeClass;
import org.junit.Test;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.Set;