Create Comparison sample using popular Kotlin web framework Javalin

Author: oleksii-unnamed

Demos/Javalin/DocumentSamples/.gitkeep

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+MIT License
+
+Copyright (c) 2018 GroupDocs.Comparison Product Family
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Demos/Javalin/DocumentSamples/ResultFiles/.gitkeep

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+web: ./build/install/comparison-javalin/bin/comparison-javalin

Demos/Javalin/LICENSE

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+![GroupDocs.Comparison](https://raw.githubusercontent.com/groupdocs-comparison/groupdocs-comparison.github.io/master/resources/image/banner.png "GroupDocs.Comparison")
+# GroupDocs.Comparison Javalin Example
+New GroupDocs.Comparison for Java UI Example
+###### version 22.3
+
+[![GitHub license](https://img.shields.io/github/license/groupdocs-comparison/GroupDocs.Comparison-for-Java-Spring.svg)](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/blob/master/Demos/Javalin/LICENSE)
+
+## System Requirements
+- Java 11+ (JDK 11+)
+
+
+## Compare documents with Java API
+
+**GroupDocs.Comparison** is a library that allows you to **compare PDF, DOCX, PPT, XLS,** and over 90 other document formats. With GroupDocs.Comparison you will be able to compare two or more files, perform style and text comparison and generate a detailed report with changes.
+
+This application allows you to compare multiple documents and can be used as a standalone application or integrated as part of your project.
+
+**Note:** without a license application will run in trial mode, purchase [GroupDocs.Comparison for Java license](https://purchase.groupdocs.com/order-online-step-1-of-8.aspx) or request [GroupDocs.Comparison for Java temporary license](https://purchase.groupdocs.com/temporary-license).
+
+
+## Demo Video
+
+<p align="center">
+  <a title="Document comparison" href="https://www.youtube.com/watch?v=82RuvtV2qpw"> 
+    <img src="https://raw.githubusercontent.com/groupdocs-comparison/groupdocs-comparison.github.io/master/resources/image/comparison.gif" width="100%" style="width:100%;">
+  </a>
+</p>
+
+
+## Features
+#### GroupDocs.Comparison
+- Clean, modern and intuitive design
+- Easily switchable colour theme (create your own colour theme in 5 minutes)
+- Responsive design
+- Mobile support (open application on any mobile device)
+- HTML and image modes
+- Fully customizable navigation panel
+- Compare documents
+- Multi-compare several documents
+- Compare password protected documents
+- Upload documents
+- Display clearly visible differences
+- Download comparison results
+- Print comparison results
+- Smooth document scrolling
+- Preload pages for faster document rendering
+- Multi-language support for displaying errors
+- Cross-browser support (Safari, Chrome, Opera, Firefox)
+- Cross-platform support (Windows, Linux, MacOS)
+
+
+## How to run
+
+You can run this sample by one of following methods
+
+
+#### Run using IDE
+
+Download [source code](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/releases/download/v22.3/groupdocs-comparison-javalin-22.3.0.zip) from github or clone this repository.
+
+```bash
+git clone https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java.git
+cd GroupDocs.Comparison-for-Java/Demos/Javalin
+```
+Open project in IDE. Open `Application.kt` file and run `main` method inside it. Then open [http://localhost:8080/comparison/](http://localhost:8080/comparison/) in your favorite browser.
+
+#### Run from command line
+
+Download [source code](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/archive/refs/heads/master.zip) from github.
+
+Alternatively you can clone this repository using next command
+```bash
+git clone https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java.git
+```
+
+Run sample from Windows PowerShell or Linux Terminal using next commands
+
+```bash
+cd GroupDocs.Comparison-for-Java/Demos/Javalin
+.\gradlew.bat :run
+```
+
+Open [http://localhost:8080/comparison/](http://localhost:8080/comparison/) in your favorite browser.
+
+#### Build distribution archive
+
+Download [source code](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/archive/refs/heads/master.zip) from github.
+
+Alternatively you can clone this repository using next command
+```bash
+git clone https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java.git
+```
+
+Run sample from Windows PowerShell or Linux Terminal using next commands
+
+```bash
+cd GroupDocs.Comparison-for-Java/Demos/Javalin
+.\gradlew.bat :build
+```
+
+After that, go to `.\build\distributions\` directory to get distribution files.
+
+#### Binary release (with all dependencies) for Linux
+
+Download [latest release](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/releases/latest) from [releases page](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/releases).
+
+**Note**: This method is **recommended** for running this sample behind firewall.
+
+```bash
+curl -J -L -o release.tar.gz https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/releases/download/v22.3/groupdocs-comparison-javalin-22.3.0.tar
+tar -xvzf release.tar.gz
+cd release/comparison-javalin-22.3
+## Make `bin/comparison-javalin` file to be runnable
+bin/comparison-javalin
+## Open http://localhost:8080/comparison/ in your favorite browser.
+```
+
+## Configuration
+You can adjust settings in `/src/main/resources/application.conf`. Specify relative/absolute path to license file by setting `licensePath` value in `/src/main/resources/application.conf` or by setting up `LIC_PATH` environment variable
+
+### Comparison configuration options
+
+| Option                 | Type    |     Default value     | Description                                                                                                          |
+|------------------------| ------- |:---------------------:|:---------------------------------------------------------------------------------------------------------------------|
+| **`filesDirectory`**   | String  |   `DocumentSamples`   | Files directory path. Indicates where uploaded and predefined files are stored. It can be absolute or relative path  |
+| **`tempDirectory`**    | String  | system temp directory | Absolute or relative path to directory to save temporary files                                                       |
+| **`resultDirectory`**  | String  |     `ResultFiles`     | Result files directory path. Directory must be created before app starts                                             |
+
+## License
+The MIT License (MIT). 
+
+Please have a look at the LICENSE.md for more details
+
+## GroupDocs Comparison on other platforms & frameworks
+
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/tree/master/Demos/Compose) with Kotlin in Compose Desktop application
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/tree/master/Demos/Dropwizard) with JAVA Dropwizard
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/tree/master/Demos/Ktor) with Ktor application
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-Java/tree/master/Demos/Spring) with Spring application
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-.NET-MVC) with .NET MVC 
+- [Compare documents](https://github.com/groupdocs-comparison/GroupDocs.Comparison-for-.NET-WebForms) with .NET WebForms 
+
+
+[Home](https://www.groupdocs.com/) | [Product Page](https://products.groupdocs.com/comparison/java) | [Documentation](https://docs.groupdocs.com/comparison/java/) | [Demos](https://products.groupdocs.app/comparison/family) | [API Reference](https://apireference.groupdocs.com/java/comparison) | [Examples](https://github.com/groupdocs-comparison/GroupDocs.comparison-for-Java/tree/master/Examples) | [Blog](https://blog.groupdocs.com/category/comparison/) | [Free Support](https://forum.groupdocs.com/c/comparison) | [Temporary License](https://purchase.groupdocs.com/temporary-license)

Demos/Javalin/Procfile

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+val kotlin_version: String by project
+val koin_version: String by project
+val logback_version: String by project
+
+plugins {
+    application
+    kotlin("jvm") version "1.6.21"
+    id("org.jetbrains.kotlin.plugin.serialization") version "1.6.21"
+}
+
+group = "com.groupdocs.ui"
+version = "22.3"
+
+repositories {
+    mavenCentral()
+    maven("https://repository.groupdocs.com/repo/")
+}
+
+application {
+    mainClass.set("com.groupdocs.ui.ApplicationKt")
+}
+
+tasks {
+    create("stage").dependsOn("installDist")
+}
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version")
+
+    implementation("com.groupdocs:groupdocs-comparison:$version")
+
+    implementation("io.insert-koin:koin-core:$koin_version")
+
+    implementation("io.javalin:javalin:4.6.1")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.13.3")
+    implementation("io.github.config4k:config4k:0.4.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.2")
+
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-hocon:1.3.3")
+
+    implementation("org.slf4j:slf4j-simple:1.7.36")
+//    implementation("ch.qos.logback:logback-classic:$logback_version")
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
+}

Demos/Javalin/README.md

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+kotlin_version=1.6.21
+koin_version=3.2.0
+logback_version=1.2.11
+kotlin.code.style=official

Demos/Javalin/build.gradle.kts

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists