Java Quick Start

Introduction

Before starting the following example make sure you have GemFire installed.

To use a Java client with GemFire, you must add the dependencies that are appropriate for your application. The GemFire dependencies are available from the Broadcom Support Portal. Login (or register if you have not already) and click Show All Releases and find “Click Green Token For Repository Access” (don’t click the blue text; click the green icon to the right of it).

Add GemFire to a Project

To add GemFire to a Maven or Gradle project
 

1. You will need a Broadcom Support Portal account and a token obtained as described above.

2. Select My Downloads. Search by Product Name = VMware Tanzu GemFire. Click on VMware Tanzu GemFire. Click on VMware Tanzu GemFire. Scroll down, Show All Releases, scroll down to Click Green Token for Repository Access and click on the green symbol to the far right. Note your email address. Copy your access_token (not including any surrounding quotation marks).

3. Add the GemFire repository to your project:

  • Maven Add the following to the pom.xml file:
  • <repositories>
    <repository>
        <id>gemfire-release-repo</id>
        <name>Broadcom GemFire Release Repository</name>
        <url>https://packages.broadcom.com/artifactory/gemfire/</url>
    </repository>
</repositories>
  • Gradle Add the following to the build.gradle file:
  • repositories {
    maven {
        credentials {
            username "$gemfireRepoUsername"
            password "$gemfireRepoPassword"
        }
        url = uri("https://packages.broadcom.com/artifactory/gemfire/")
    }
}

4. Add your Broadcom Maven Repository credentials.

  • Maven Add the following to the .m2/settings.xml file. Replace MY-USERNAME@example and MY-ACCESS-TOKEN with your Broadcom Maven Repository credentials.
  • <settings>
    <servers>
        <server>
            <id>gemfire-release-repo</id>
            <username>MY-USERNAME@example.com</username>
            <password>MY-ACCESS-TOKEN</password>
        </server>
    </servers>
</settings>
  • Gradle Add the following to the local .gradle/gradle.properties or project gradle.properties file. Replace MY-USERNAME@example and MY-ACCESS-TOKEN with your Broadcom Maven Repository credentials.
  • gemfireRepoUsername=MY-USERNAME@example.com
gemfireRepoPassword=MY-ACCESS-TOKEN

5. Add the dependencies to the project.

  • Maven Add the following to your pom.xml file. Replace VERSION with the version of GemFire being used for the project.
  •  <dependencies>
    <dependency>
        <groupId>com.vmware.gemfire</groupId>
        <artifactId>gemfire-core</artifactId>
        <version>VERSION</version>
    </dependency>
</dependencies>
  • Gradle Add the following to your build.gradle file. Replace $VERSION with the version of GemFire being used for the project.
  • dependencies {
  implementation "com.vmware.gemfire:gemfire-core:$VERSION"
}

Start a GemFire Cluster

For the following client examples, start a simple cluster and create an example region.

1. With GemFire installed or available, in a terminal start the GemFire shell (GFSH) 
$ gfsh
2. Using GFSH start a locator 
            start locator
3. Next, use GFSH to start a server 
            start server
4. Create a region called “helloWorld”. 
            create region --name=helloWorld --type=PARTITION

Simple Put and Get

The following is an example of connecting to the GemFire cluster started above.

This example

  • Creates a ClientCache, with cluster connection information.
    • Creates a client side PROXY Region (“helloWorld”) that represents the helloWorld region that was created on the server.
    • PUTs data into the helloWorld region.
    • GETs that data from the helloWorld region.
    • Prints the value on the command line.
import org.apache.geode.cache.Region;
import org.apache.geode.cache.client.ClientCache;
import org.apache.geode.cache.client.ClientCacheFactory;
import org.apache.geode.cache.client.ClientRegionShortcut;
public class HelloWorldApplication {
  public static void main(String[] args) {
    ClientCache cache = new ClientCacheFactory().addPoolLocator("127.0.0.1", 10334).create();
    Region<String, String>
        helloWorldRegion =
        cache.<String, String>createClientRegionFactory(ClientRegionShortcut.PROXY).create("helloWorld");
    helloWorldRegion.put("1", "HelloWorldValue");
    String value1 = helloWorldRegion.get("1");
    System.out.println(value1);
    cache.close();
  }
}

Build and run the application. You should see ‘HelloWorldValue’ printed in the command line.

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