Spring Cloud for Amazon Web Services

Spring Cloud for Amazon Web Services, part of the Spring Cloud umbrella project, eases the integration with hosted Amazon Web Services. It offers a convenient way to interact with AWS provided services using well-known Spring idioms and APIs, such as the messaging or caching API. Developers can build their application around the hosted services without having to care about infrastructure or maintenance.

Checking out and building

To check out the project and build it from source, do the following:

git clone https://github.com/spring-cloud/spring-cloud-aws.git
cd spring-cloud-aws
mvn package

If you encounter out of memory errors during the build, increase available heap and permgen for Maven:

MAVEN_OPTS='-XX:MaxPermSize=258m -Xmx1024m'

To build and install jars into your local Maven cache:

mvn install

Building documentation

Documentation can be built by activating the `docs`profile in the maven build. If there is an ruby error like

LoadError: no such file to load -- asciidoctor

then the user must install the asciidoctor gem and set the environment variable `GEM_HOME`to the ruby gem folder. For example:

  # Get gem info
  gem environment

  export GEM_HOME=<PATH FOR GEM ENVIRONMENT>

Using IntelliJ IDEA

Spring Cloud AWS development is done with IntelliJ IDEA. In order to create all IntelliJ IDEA project files, you have to import the file within idea as a maven project.

Note: Please make sure to revert all changes in the .idea config file directory, as the maven plugin overwrites the configuration files kept in the scm.

Running integration tests

Spring Cloud AWS contains a test-suite which runs integration tests to ensure compatibility with the Amazon Web Services. In order to run the integration tests, the build process has to create different resources on the Amazon Webservice platform (Amazon EC2 instances, Amazon RDS instances, Amazon S3 Buckets, Amazon SQS Queues). Creating these resources takes time and costs money, because every instance creation is charged with a one hour usage. Therefore Spring Cloud AWS does not execute the integration tests by default.

In order to execute the integration tests you have to create two configuration files that configure the necessary parameters to build the environment.

Please create a new file named access.properties. This file must contain three properties named accessKey,secretKey and rdsPassword. These two properties accessKey and secretKey are account/user specific and should never be shared to anyone. To retrieve these settings you have to open your account inside the AWS console and retrieve them through the Security Credentials Page. Note: In general we recommend that you use an Amazon IAM user instead of the account itself. The last password rdsPassword is used to access the database inside the integration tests. This password has a minimum length of 8 characters.

An example file will look like this

cloud.aws.credentials.accessKey=ilaugsjdlkahgsdlaksdhg
cloud.aws.credentials.secretKey=aöksjdhöadjs,höalsdhjköalsdjhasd+
rdsPassword=someVerySecretPassword

Also you have to create another file named mail.properties which will provide the sender and recipient mail address to test the Amazon Simple E-Mail Service. These two addresses must be verified for the Amazon SES Service.

An example file will have the following contents

[email protected]
[email protected]

After creating both files and storing them outside the project (or inside the project, they are ignored in git) you have to provide the configuration directory when running the build. Providing these configuration settings will automatically execute the integration tests.

To build with the integration tests you must execute

mvn verify -Dels.config.dir=/Users/foo/config/dir
(on windows you will also need a leading slash before the drive letter e.g. /C:/users/foo/config/dir)

The integration test will create an Amazon Web Services CloudFormation stack and execute the tests. The stack is destroyed after executing the tests (either successful or failed) to ensure that there are no unnecessary costs.

Costs of integration tests

The costs for one integration test run should not be more than 0.40 $ per hour (excl. VAT).

Developing using Amazon Web Services

During development it might be time-consuming to run the integration tests regularly. In order to create a stack only once, and reuse them for the tests run, you have to create the stack manually using the template found in /spring-cloud-aws-integration-test/src/test/resources. You will need to create the stack with the name "IntegrationTestStack" to ensure that the integration tests will re-use the stack.

Getting in touch

Spring Cloud Team on Twitter

Individual team members can be found on different social media channels

• Agim Emruli (Twitter / LinkedIn)

• Alain Sahli (Twitter / LinkedIn)

• Christian Stettler (Twitter)

Contributing

Spring Cloud is released under the non-restrictive Apache 2.0 license, and follows a very standard Github development process, using Github tracker for issues and merging pull requests into master. If you want to contribute even something trivial please do not hesitate, but follow the guidelines below.

Sign the Contributor License Agreement

Before we accept a non-trivial patch or pull request we will need you to sign the Contributor License Agreement. Signing the contributor’s agreement does not grant anyone commit rights to the main repository, but it does mean that we can accept your contributions, and you will get an author credit if we do. Active contributors might be asked to join the core team, and given the ability to merge pull requests.

Code of Conduct

This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].

Code Conventions and Housekeeping

None of these is essential for a pull request, but they will all help. They can also be added after the original pull request but before a merge.

• Use the Spring Framework code format conventions. If you use Eclipse you can import formatter settings using the eclipse-code-formatter.xml file from the Spring Cloud Build project. If using IntelliJ, you can use the Eclipse Code Formatter Plugin to import the same file.

• Make sure all new .java files to have a simple Javadoc class comment with at least an @author tag identifying you, and preferably at least a paragraph on what the class is for.

• Add the ASF license header comment to all new .java files (copy from existing files in the project)

• Add yourself as an @author to the .java files that you modify substantially (more than cosmetic changes).

• Add some Javadocs and, if you change the namespace, some XSD doc elements.

• A few unit tests would help a lot as well — someone has to do it.

• If no-one else is using your branch, please rebase it against the current master (or other target branch in the main project).

• When writing a commit message please follow these conventions, if you are fixing an existing issue please add Fixes gh-XXXX at the end of the commit message (where XXXX is the issue number).