Requirements

• Maven [3.1.x,)
• Eclipse Luna 4.4
• Java SDK [1.7.x,)
• Google Cloud Setup

Setting up local dev environment

Install Java SDK [1.7.x,)

Install Java SDK 8

Install Eclipse Luna 4.4

Install Eclipse Luna 4.4 used in this tutorial. Other Eclipse versions may not have Google APIs plugin.

Install Google APIs Plugins

• Open Eclipse
• Help -> Install New Software...
• Add 'https://dl.google.com/eclipse/plugin/4.4'
• Click Next -> Next -> Finish
• Restart Eclipse

Install Maven

Install the latest Maven

Set up Google Cloud PubSub

Follow the instructions on Google Cloud Pubsub page to create

• Google Account
• Google Cloud project
• Enable APIs

Create a PubSub Topic and Subscription

• Go to Google Developer Console
• Go to your project created previously
• Select Pub/Sub
• Create new topic
• Create new subscription

Set up Google application default credentials

The simplest way to get a credential for this purpose is to create a service account using the Google Developers Console in the section APIs & Auth, in the sub-section Credentials. Create a service account or choose an existing one and select Generate new JSON key. Set the environment variable to the path of the JSON file downloaded. - Google Application Default Credentials

echo "export GOOGLE_APPLICATION_CREDENTIALS=/path/to/downloaded/authentication/file.json" > ~/.bash_profile
source ~/.bash_profile

Create a PubSub Client

Download a Google PubSub Client sample

• Download my Google Cloud PubSub sample
• Prepare a sample log which is used to stream to the Pub/Sub topic
• Update variable 'file' in com.machinezone.gcloud.pubsub.client.sandbox.MZPublisher.java
• Update the topic name in com.machinezone.gcloud.pubsub.client.sandbox.MZPublisher.java
• Update the subscription name in com.machinezone.gcloud.pubsub.client.sandbox.MZSubscriber.java

Run in command-line

cd /your/downloaded/sample/code/dir
mvn clean install
# start the subscriber
java -cp target/pubsub-sandbox-0.0.1-SNAPSHOT.jar com.machinezone.gcloud.pubsub.client.sandbox.MZSubscriber
# start sending messages
java -cp target/pubsub-sandbox-0.0.1-SNAPSHOT.jar com.machinezone.gcloud.pubsub.client.sandbox.MZPublisher

Run in Eclipse

• Import as an Eclipse project
• Right click on the project -> Google -> Add Google APIs...
• Add Google OAuth API
• Add Google Cloud Pub/Sub API
• Prepare a log file (file path is in com.machinezone.gcloud.pubsub.client.sandbox.MZPublisher)
• Start the Publisher by right click on MZPublisher.java -> Run As... -> Java Application
• Start the Subscriber by right click on MZSubscriber.java -> Run As... -> Java Application