Use MongoDB createIndex in Java

private MongoCollection<Document> createCollection(String collectionName) {
    String indexFieldName1 = "itemId";
    String indexFieldName2 = "time";
    MongoCollection<Document> mongoCollection = this.database.getCollection(collectionName);

    if (mongoCollection == null) {
        this.database.createCollection(collectionName);
        mongoCollection = this.database.getCollection(collectionName);
    }

    IndexOptions indexOptions1 = new IndexOptions().unique(false)
            .background(false).name(indexFieldName1);
    Bson keys1 = new Document(indexFieldName1, Integer.valueOf(1));
    mongoCollection.createIndex(keys1, indexOptions1);

    IndexOptions indexOptions2 = new IndexOptions().unique(false)
            .background(false).name(indexFieldName2);
    Bson keys2 = new Document(indexFieldName2, Integer.valueOf(1));
    mongoCollection.createIndex(keys2, indexOptions2);

    return mongoCollection;
}

References
https://www.programcreek.com/java-api-examples/?class=com.mongodb.client.MongoCollection&method=createIndex

Bootstrap Login Screen with Floating Labels

HTML

<!-- This snippet uses Font Awesome 5 Free as a dependency. You can download it at fontawesome.io! -->

<body>
  <div class="container">
    <div class="row">
      <div class="col-sm-9 col-md-7 col-lg-5 mx-auto">
        <div class="card card-signin my-5">
          <div class="card-body">
            <h5 class="card-title text-center">Sign In</h5>
            <form class="form-signin">
              <div class="form-label-group">
                <input type="email" id="inputEmail" class="form-control" placeholder="Email address" required autofocus>
                <label for="inputEmail">Email address</label>
              </div>

              <div class="form-label-group">
                <input type="password" id="inputPassword" class="form-control" placeholder="Password" required>
                <label for="inputPassword">Password</label>
              </div>

              <div class="custom-control custom-checkbox mb-3">
                <input type="checkbox" class="custom-control-input" id="customCheck1">
                <label class="custom-control-label" for="customCheck1">Remember password</label>
              </div>
              <button class="btn btn-lg btn-primary btn-block text-uppercase" type="submit">Sign in</button>
              <hr class="my-4">
              <button class="btn btn-lg btn-google btn-block text-uppercase" type="submit"><i class="fab fa-google mr-2"></i> Sign in with Google</button>
              <button class="btn btn-lg btn-facebook btn-block text-uppercase" type="submit"><i class="fab fa-facebook-f mr-2"></i> Sign in with Facebook</button>
            </form>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>

CSS

:root {
  --input-padding-x: 1.5rem;
  --input-padding-y: .75rem;
}

body {
  background: #007bff;
  background: linear-gradient(to right, #0062E6, #33AEFF);
}

.card-signin {
  border: 0;
  border-radius: 1rem;
  box-shadow: 0 0.5rem 1rem 0 rgba(0, 0, 0, 0.1);
}

.card-signin .card-title {
  margin-bottom: 2rem;
  font-weight: 300;
  font-size: 1.5rem;
}

.card-signin .card-body {
  padding: 2rem;
}

.form-signin {
  width: 100%;
}

.form-signin .btn {
  font-size: 80%;
  border-radius: 5rem;
  letter-spacing: .1rem;
  font-weight: bold;
  padding: 1rem;
  transition: all 0.2s;
}

.form-label-group {
  position: relative;
  margin-bottom: 1rem;
}

.form-label-group input {
  height: auto;
  border-radius: 2rem;
}

.form-label-group>input,
.form-label-group>label {
  padding: var(--input-padding-y) var(--input-padding-x);
}

.form-label-group>label {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  margin-bottom: 0;
  /* Override default `<label>` margin */
  line-height: 1.5;
  color: #495057;
  border: 1px solid transparent;
  border-radius: .25rem;
  transition: all .1s ease-in-out;
}

.form-label-group input::-webkit-input-placeholder {
  color: transparent;
}

.form-label-group input:-ms-input-placeholder {
  color: transparent;
}

.form-label-group input::-ms-input-placeholder {
  color: transparent;
}

.form-label-group input::-moz-placeholder {
  color: transparent;
}

.form-label-group input::placeholder {
  color: transparent;
}

.form-label-group input:not(:placeholder-shown) {
  padding-top: calc(var(--input-padding-y) + var(--input-padding-y) * (2 / 3));
  padding-bottom: calc(var(--input-padding-y) / 3);
}

.form-label-group input:not(:placeholder-shown)~label {
  padding-top: calc(var(--input-padding-y) / 3);
  padding-bottom: calc(var(--input-padding-y) / 3);
  font-size: 12px;
  color: #777;
}

.btn-google {
  color: white;
  background-color: #ea4335;
}

.btn-facebook {
  color: white;
  background-color: #3b5998;
}

/* Fallback for Edge
-------------------------------------------------- */

@supports (-ms-ime-align: auto) {
  .form-label-group>label {
    display: none;
  }
  .form-label-group input::-ms-input-placeholder {
    color: #777;
  }
}

/* Fallback for IE
-------------------------------------------------- */

@media all and (-ms-high-contrast: none),
(-ms-high-contrast: active) {
  .form-label-group>label {
    display: none;
  }
  .form-label-group input:-ms-input-placeholder {
    color: #777;
  }
}

References
https://startbootstrap.com/snippets/login/

Install .NET on Manjaro

.NET Core
If you only want to run .NET Core managed applications, install the dotnet-runtime package.
To build apps with .NET Core, install dotnet-sdk as well.
Microsoft recommends using Visual Studio Code , their Electron-based FOSS IDE, to build & debug .NET Core apps.

Tip: Add ~/.dotnet/tools to PATH, otherwise dotnet tools with not work from shell.
Mono
Install the mono package.

References
https://wiki.archlinux.org/index.php/.NET_Core
https://wiki.archlinux.org/index.php/Mono

Improve font rendering in Manjaro

sudo nano /etc/fonts/local.conf
<match target="font">
  <edit name="autohint" mode="assign">
    <bool>true</bool>
  </edit>
  <edit name="hinting" mode="assign">
    <bool>true</bool>
  </edit>
  <edit mode="assign" name="hintstyle">
    <const>hintslight</const>
  </edit>
  <edit mode="assign" name="lcdfilter">
   <const>lcddefault</const>
 </edit>
</match>
cp ~/.Xresources ~/.Xresources.bak
nano ~/.Xresources
Xft.dpi: 120
Xft.antialias: true
Xft.hinting: true
Xft.rgba: rgb
Xft.autohint: false
Xft.hintstyle: hintslight
Xft.lcdfilter: lcddefault
xrdb -merge ~/.Xresources

Make sure that Anti aliasing is On, and Hiting is set to Slight in System Settings (Appearence).

References
https://wiki.manjaro.org/index.php?title=Improve_Font_Rendering