Initial code migration

.gitignore

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+target/
+.idea/
+.settings/
+*.iml
+.classpath
+.project
+.checkstyle
+release.properties

CONTRIBUTING.md

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+# Contributing | Firebase Admin Java SDK
+
+Thank you for contributing to the Firebase community!
+
+ - [Have a usage question?](#question)
+ - [Think you found a bug?](#issue)
+ - [Have a feature request?](#feature)
+ - [Want to submit a pull request?](#submit)
+ - [Need to get set up locally?](#local-setup)
+
+
+## <a name="question"></a>Have a usage question?
+
+We get lots of those and we love helping you, but GitHub is not the best place for them. Issues
+which just ask about usage will be closed. Here are some resources to get help:
+
+- Go through the [guides](https://firebase.google.com/docs/admin/setup/)
+- Read the full [API reference](https://firebase.google.com/docs/reference/admin/java/)
+
+If the official documentation doesn't help, try asking a question on the
+[Firebase Google Group](https://groups.google.com/forum/#!forum/firebase-talk/) or one of our
+other [official support channels](https://firebase.google.com/support/).
+
+**Please avoid double posting across multiple channels!**
+
+
+## <a name="issue"></a>Think you found a bug?
+
+Yeah, we're definitely not perfect!
+
+Search through [old issues](https://github.com/firebase/firebase-admin-java/issues) before
+submitting a new issue as your question may have already been answered.
+
+If your issue appears to be a bug, and hasn't been reported,
+[open a new issue](https://github.com/firebase/firebase-admin-java/issues/new). Please use the
+provided bug report template and include a minimal repro.
+
+If you are up to the challenge, [submit a pull request](#submit) with a fix!
+
+
+## <a name="feature"></a>Have a feature request?
+
+Great, we love hearing how we can improve our products! Share you idea through our
+[feature request support channel](https://firebase.google.com/support/contact/bugs-features/).
+
+
+## <a name="submit"></a>Want to submit a pull request?
+
+Sweet, we'd love to accept your contribution!
+[Open a new pull request](https://github.com/firebase/firebase-admin-java/pull/new/master) and fill
+out the provided template.
+
+**If you want to implement a new feature, please open an issue with a proposal first so that we can
+figure out if the feature makes sense and how it will work.**
+
+Make sure your changes pass our linter and the tests all pass on your local machine.
+Most non-trivial changes should include some extra test coverage. If you aren't sure how to add
+tests, feel free to submit regardless and ask us for some advice.
+
+Finally, you will need to sign our
+[Contributor License Agreement](https://cla.developers.google.com/about/google-individual),
+and go through our code review process before we can accept your pull request.
+
+### Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution.
+This simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+### Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+
+## <a name="local-setup"></a>Need to get set up locally?
+
+### Initial Setup
+
+Install Java 7 or higher. You can also use Java 8, but please note that the Firebase Admin SDK must
+maintain full Java 7 compatibility. Therefore make sure that you do not use any Java 8 features
+(e.g. lambdas) when writing code for the Admin Java SDK.
+
+We use [Apache Maven](http://maven.apache.org/) for building, testing and releasing the Admin Java
+SDK code. Follow the [installation guide](http://maven.apache.org/install.html), and install Maven
+3.3 or higher.
+
+### Running Linters
+
+[Maven Checkstyle plugin](https://maven.apache.org/plugins/maven-checkstyle-plugin/) is configured
+to run everytime the build is invoked. This plugin verifies source code format, and enforces a
+number of other Java programming best practices. Any style violations will cause the build to break.
+
+Configuration for the Checkstyle plugin can be found in the `checkstyle.xml` file at the root of the
+repository. To execute only the linter without rest of the build pipeline, execute the following
+command:
+
+```
+mvn validate
+```
+
+If you are using Eclipse for development, you can install the
+[Eclipse Checkstyle plugin](http://eclipse-cs.sourceforge.net/#!/), and import the `checkstyle.xml`
+file into the IDE. This enables you to have the linter constantly checking your code as you develop.
+A similar [plugin](https://plugins.jetbrains.com/plugin/1065-checkstyle-idea) is available for
+IntelliJ IDEA as well.
+
+### Unit Testing
+
+Tests are implemented using the [Junit4](http://junit.org/junit4/) framework, and are housed under
+the `src/test` subdirectory. They get executed as part of the build, and test failures will cause
+the build to break. To run the unit tests without the rest of the build pipeline, execute the
+following command:
+
+```
+mvn test
+```
+
+### Integration Testing
+
+Integration tests are also written using Junit4. They coexist with the unit tests in the `src/test`
+subdirectory. Integration tests follow the naming convention `*IT.java` (e.g. `DataTestIT.java`),
+which enables the Maven Surefire and Failsafe plugins to differentiate between the two types of
+tests. Integration tests are executed against a real life Firebase project, and therefore
+requires an Internet connection. Create a new project in the
+[Firebase console](https://console.firebase.google.com/) if you do not already have one. Use a 
+separate, dedicated project for integration tests since the test suite makes a large number of
+writes to the Firebase realtime database. Download the service account private key from the 
+"Settings" page of the project. Now run the following command to invoke the integration test suite:
+
+```
+mvn verify -Dfirebase.it.certificate=path/to/your/serviceAccount.json
+```
+
+Make sure to specify the correct path to your downloaded service account key file as the
+`firebase.it.certificate` system property. 
+
+The above command invokes both unit and integration test suites. To execute only the integration
+tests, run the command as follows:
+
+```
+mvn verify -Dfirebase.it.certificate=path/to/your/serviceAccount.json -DskipUTs
+```
+
+### Generating API Docs
+
+Invoke the [Maven Javadoc plugin](https://maven.apache.org/plugins/maven-javadoc-plugin/) as 
+follows to generate API docs for all packages in the codebase:
+
+```
+mvn javadoc:javadoc
+```
+
+This will generate the API docs, and place them in the `target/site/apidocs` directory. 
+
+To generate API docs for only the public APIs (i.e. ones that are not marked with `@hide` tags),
+you need to trigger the `devsite-apidocs` Maven profile. This profile uses Maven Javadoc plugin
+with [Doclava](https://code.google.com/archive/p/doclava/), which honors the `@hide` tags in
+source code. Dovlava also accepts a set of [Clearsilver](http://www.clearsilver.net/) templates as
+a parameter. You can trigger this Maven profile by running the following command:
+
+```
+mvn site -Ddevsite.template=path/to/templates/directory/
+```
+
+This command will place the generated API docs in the `target/apidocs` directory.
+

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