Couchbase Lite on Java — Installing

Description — Couchbase Lite on Java — a framework for developing offline-first Java applications for mobile and edge
Abstract — This content provides instructions that enable you to deploy Couchbase Lite on java
Related Content — Install | Prerequisites | Build and Run

Introduction

Couchbase Lite on Java 3.0.0_ enables development and deployment of Couchbase Lite applications to a JVM environment. You can deploy Standalone (Java Desktop/Console) apps or Web Apps (using, for example, Tomcat; including embedded Tomcat deployments).

Quick Steps

For experienced developers, this is all you need to add Couchbase Lite for Java 3.0.0 to your application projects.

Enterprise Edition
Community Edition

Include the following in your Gradle build.gradle or Maven pom.xml file, as appropriate:

The Couchbase Enterprise Edition repository
https://mobile.maven.couchbase.com/maven2/dev/
The Couchbase Lite Enterprise Edition dependency:
couchbase-lite-java-ee:3.0.0

Include the Couchbase Lite for Java dependency in your Gradle build.gradle or Maven pom.xml file, as appropriate:
couchbase-lite-java:3.0.0
For Gradle:
Check you have mavenCentral() in repositories (or in settings.gradle).
Maven automatically checks its own repo for dependencies.

That’s it! You’re all set to begin developing powerful Couchbase Lite applications.

Now, try the Getting Started application, which demonstrates use of key CRUD functionality.

Preparing Your Build Environment

This section shows how to set up and use Couchbase Lite on Java to build desktop and web applications using gradle, Maven, Tomcat and Intellij IDEA Community Edition. It assumes a familiarity with these products, however you are free to use your own choice of development tools.

Binaries

Couchbase Lite on Java binaries are available for both Community (CE) and Enterprise (EE) editions from the Maven repositories. Alternatively, you can download compressed binaries — see the Downloaded Binaries section in Prerequisites

Prerequisites

Planning to sync with a Couchbase Server?

You will need to have runnable instances of Couchbase Server and Sync Gateway installed. If you have not already done so see Prepare Sync Gateway
Running on Microsoft Windows?

Windows requires C++ runtime installed. Please install the Visual C++ Redistribution package from this link: https://www.microsoft.com/en-us/download/details.aspx?id=52685
Deploying to Linux?
You need to deploy the Couchbase Lite support library, which is available only on the zip download distributable. See the Additional Steps for Linux section in Prerequisites.

Standalone Apps

Using Gradle

Create a project folder
Initialize it for a Gradle Java application
Include the content shown in Example 1 in your app-level build.gradle file

Open the project folder in Intellij IDEA and import the gradle settings.

If you don’t have auto-import set for Gradle projects, then accept the Import Gradle Project prompt that is displayed bottom-right of the screen
Note the Gradle menu at the extreme right of the screen:

That’s it. You’re all set to start building your own Couchbase Lite on Java applications — see Build and Run for an example of how to do that.

Example 1. build.gradle file content

Community edition
Enterprise Edition

Compile options

// Required only if your project has some Kotlin source code
kotlinOptions { jvmTarget = '1.8' }

// Set minimum JVM level to ensure availability of, for example, lambda expressions
compileOptions {
    targetCompatibility 1.8
    sourceCompatibility 1.8

//   ... other section content as required by user
}

Dependencies

dependencies {
    implementation "com.couchbase.lite:couchbase-lite-java:3.0.0"

//   ... other section content as required by user
}

Compile options

// Required only if your project has some Kotlin source code
kotlinOptions { jvmTarget = '1.8' }

// Set minimum JVM level to ensure availability of, for example, lambda expressions
compileOptions {
    targetCompatibility 1.8
    sourceCompatibility 1.8

//   ... other section content as required by user
}

Dependencies

dependencies {
    implementation "com.couchbase.lite:couchbase-lite-java:3.0.0"

//   ... other section content as required by user
}

Repositories

repositories {
    maven {url 'https://mobile.maven.couchbase.com/maven2/dev/'}

//   ... other section content as required by user
    }

Using Maven

Include the content shown in Example 2 in your pom.xml file in the root of your project folder
That’s it — just add your own code

You’re all set to start building your own Couchbase Lite on Java applications — see Build and Run for an example of how to do that.

Example 2. pom.xml file content

Community edition
Enterprise Edition

Compile properties

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

Dependencies

<dependencies>
  <dependency>
      <groupId>com.couchbase.lite</groupId>
      <artifactId>couchbase-lite-java</artifactId>
      <version>3.0.0</version>
  </dependency>

  //   ... any other section content as required by user
</dependencies>

Compile properties

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

Dependencies

<dependencies>

    <dependency>
      <groupId>com.couchbase.lite</groupId>
      <artifactId>couchbase-lite-java-ee</artifactId>
      <version>3.0.0</version>
    </dependency>

    <!-- ... any other section content as required by user-home  -->
</dependencies>

Repositories

<repositories>
  <repository>
    <id>couchbase</id>
    <url>https://mobile.maven.couchbase.com/maven2/dev/</url>
  </repository>
  //   ... any other section content as required by user

</repositories>

Web App Development

This section explains how to set-up a build project to create Couchbase Lite on Java web apps using gradle and Intellij IDEA.

Using Maven

For examples of how to do this using Maven POM files, see —

Tomcat

In our examples here we build and deploy web apps using a gradle plugin based on the com.bmuschko.tomcat plugin. It provides a simple Tomcat harness that can be used from within Intellij IDEA or the command-line — see Embedded Tomcat

Multiple Web Apps

Each web application has its own *class loader (WebappX). This loads the classes, jars, and resources found in the application’s WEB-INF/classes and WEB-INF/lib folders, together with any shared jar files from $CATALINA_BASE/lib — see tomcat documentation for more.

So, if you are running multiple Couchbase Lite web applications, deploy your Couchbase Lite on Java library <pathToCbl>/libs to $CATALINA_BASE/lib. This means you do not need to deploy it in each web app and minimizes the size of each app.

Configuring Couchbase Lite logging functionality will affect the logging of all web applications as the common class loader shares Couchbase Lite Console, File and Custom logging functionalities across all web apps.

For information about building a WAR file see Deploying a WAR File

Prerequisites

Ensure your build environment matches the runtime Tomcat environment. Specifically, that the Java and Tomcat versions are the same.
If your Tomcat server runs Linux, declare the shared libraries (<pathToCbl>/support) in the $CATALINA_HOME/bin/setenv.sh script file — see: Additional Steps for Linux section in Prerequisites.
Ensure the Couchbase Lite jars (<pathToCbl>/lib) are on the executable path within Tomcat — see: Multiple Web Apps

This also means you should declare the dependencies as providedCompile to avoid them being bundled into the WEB-INF/libs folder

Steps

Create a project folder and initialize it for a Gradle Java application
```
gradle init
```
Create your build.gradle file, including the Example 3 in your app-level build.gradle:
Open the project folder in Intellij IDEA and import the gradle settings.

If you don’t have auto-import set for Gradle projects, then accept the Import Gradle Project prompt that is displayed bottom-right of the screen.
Note the Gradle menu at the extreme right of the screen:
image::GradleMenuWebApp.png[,300]

If you want to deploy your app to a local tomcat container then see [Deploying a WAR file to tomcat]

That’s it. You’re all set to start building your own Couchbase Lite on Java applications — see Building a Getting Started App for an example of how to do that.

Example 3. build.gradle file content

Community
Enterprise

dependencies {
    implementation "com.couchbase.lite:couchbase-lite-java:3.0.0"

//   ... other section content as required by user
}

repositories {
    maven {url 'https://mobile.maven.couchbase.com/maven2/dev/'}

//   ... other section content as required by user
    }

dependencies {
    implementation "com.couchbase.lite:couchbase-lite-java-ee:3.0.0"

//   ... other section content as required by user
    }

Embedded Tomcat

The simplest way to build and deploy your Couchbase Lite on Java web app is to use a gradle plugin that provides a simple Tomcat harness.

Our examples are based on the com.bmuschko.tomcat plugin — see com.bmuschko.tomcat on Github.

Including the plugin in your build.gradle file make a number of tomcat tasks available to you. View them using:

./gradlew tasks

This shows that the following web application tasks are now available:

tomcatJasper - Runs the JSP compiler and turns JSP pages into Java source.
tomcatRun - Uses your files as and where they are and deploys them to Tomcat.
tomcatRunWar - Assembles the web app into a war and deploys it to Tomcat.
tomcatStop - Stops Tomcat.

So, to run the app use:

./gradlew tomcatRun

Deploying a WAR File

To deploy your web app to a local Tomcat instance you need to generate a WAR file. However, you should note that when creating a war file, if you use the implementation dependency type then your Couchbase Lite jar files will be bundled into WEB-INF/lib of the web application. To exclude Couchbase Lite jar files from getting bundled and to use Couchbase Lite in multiple web applications, change the dependency type from implementation to providedCompile

You can do this using the Gradle command below from within your project folder:
```
./gradlew war
```
The generated war file will be at <PROJECT ROOT>/build/libs.
Deploy the war file to Tomcat, by copying it to $CATALINA_BASE/webapps

You can also use Tomcat’s Manager App to deploy the war file — see Tomcat’s Manager App documentation for more detail.
To use common class loader approach to load Couchbase Lite libraries, copy all of the Couchbase Lite jar files in $CATALINA_BASE/lib.

For linux platform see also — Using Native Libraries for Linux in Prerequisites

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