This project provides an Eclipse plugin for building, debugging, and deploying Google Cloud Platform applications.
mvn package should
generate a p2-accessible repository in
This project is built using Maven Tycho, a set of extensions to Maven for building Eclipse bundles and features.
- The Google Cloud SDK; install this somewhere on your file system.
An alternative is to install Cloud Tools for Eclipse into your Eclipse IDE and use its option to automatically install the Cloud SDK.
The Eclipse IDE. It's easiest to use the Eclipse IDE for Java EE Developers package. You must use Eclipse 4.7 (Oxygen) or later. We use target platforms to support building for earlier versions of Eclipse. You also need the following:
The m2e connector for maven-dependency-plugin should be installed from
http://ianbrandt.github.io/m2e-maven-dependency-plugin/. This connector should be prompted for by M2Eclipse. If not, use Preferences > Maven > Discovery > Open Catalog and search for Dependency and install.
The Google Java Format plugin for Eclipse. Download the latest version and place the jar into your Eclipse installation's
dropins/directory (on MacOS this may be in
Maven 3.5.0 or later. Although m2eclipse is bundled with its own Maven install, Maven is necessary to test command-line builds.
git (optional: you can use EGit from within Eclipse instead)
Clone the project to a local directory using
git clone https://github.com/GoogleCloudPlatform/google-cloud-eclipse.git.
Configuring Maven/Tycho Builds
The plugin is built using Maven/Tycho and targeted to Java 8.
The tests need to find the Google Cloud SDK. You can either:
- Place the SDK
/bindirectory on your
GOOGLE_CLOUD_SDK_HOMEto point to your SDK
Changing the Eclipse Platform compilation and testing target
By default, the build is targeted against Eclipse Oxygen / 4.7.
You can explicitly set the
eclipse.target property to
$ mvn -Declipse.target=neon package
Adding a new bundle/fragment
We normally put production code into a bundle and tests as a fragment hosted
by that bundle, put under the
For now we have been committing both the
pom.xml and Eclipse's
.settings/ files. We have a master set
of project settings in
eclipse/settings; see the
README.md for more details.
Our CI process is configured to run our tests with JaCoCo, which requires
some additional configuration to add new bundles and fragments
Import into Eclipse
We pull in some dependencies directly from Maven-style repositories, such as Maven Central and the Sonatype staging repository, which isn't directly supported within Eclipse. We have a few hoops to jump through to set up a working development environment.
Assemble the IDE Target Platform
The Eclipse IDE and Tycho both use a Target Platform to manage the dependencies for the source bundles and features under development. Although Tycho can pull dependencies directly from Maven-style repositories (like Maven Central), Eclipse cannot. So we use Tycho to cobble together a target platform suitable for the Eclipse IDE with the following command.
$ (cd eclipse; mvn package) # may want -Declipse.target=XXX
This command creates a local copy of the
target platform, including any Maven dependencies, into
You will use this repository to create a target platform within the IDE,
as described below.
The Eclipse version used for the target platform is affected by the
eclipse.target property, described below.
You must regenerate the target platform and reconfigure the IDE's target platform whenever dependencies are updated.
Steps to import into the Eclipse IDE
Setup JDK 8 in Eclipse (this may already be set up by Eclipse's JRE/JDK auto-discovery)
Select Standard VM and click
Select the folder that contains the JDK 8 installation by clicking
Java/Installed JREs/Execution Environmentspage.
JavaSE-1.8in the list on the left under
The JDK just added should show up in the list on the right along with other installed JDKs/JREs. Set the checkbox next to the JDK 8 added in the previous steps to mark it as compatible with the
Set up the Target Platform: you will need to repeat this process whenever items are changed in the target platform, such as a new release of the
As described above, you must first build the target platform with Maven:
$ mvn -Pide-target-platform package
Preferencesdialog, go to
Nothingto create a new Target Platform.
GCP IDE Target Platform.
Add...button (found beside the
Work with:field) and then select
Localto find a local repository. Navigate to
.../eclipse/ide-target-platform/target/repository, and click
Once the main content populates, check the
Uncategorizeditem to pull in all items. Click
Finishto complete the new target platform definition.
Select your new target platform (instead of Running Platform) in the
Apply and Finishto load this new target platform.
Eclipse will load the target.
Import the projects
File/Import...menu in Eclipse.
Existing Maven Projectsfrom the list.
Browse...and select the directory that contains the project.
pom.xmlfiles representing modules should be displayed. Make sure that all of them are selected except the sub-directories under
eclipse, and click
- The subprojects under the
eclipsedirectory define target platforms for the Tycho build. It's easier to edit the files from the
- The subprojects under the
Maven may prompt you to install several additional plugin connector plugins from Tycho if they are not already installed. Click
Finishto install them. If Eclipse prompts you to install any other plugins, do so.
Restart Eclipse when prompted.
Check the imported projects:
There should be no errors in the
Problemsviews in Eclipse. However you may see several low-priority warnings.
- You may see Maven-related errors like "plugin execution not covered by lifecycle configuration". If so, right-click on the problem and select Quick Fix > Discover new m2e connectors and follow the process to install the recommended plugin connectors.
Create and initialize a launch configuration:
gcloud-eclipse-tools.launchfile under the
google-cloud-eclipsemodule in the
Set variables required for launch:
1. Go to the second tab for `Arguments` 1. Click the `Variables...` button for `VM argument:` 1. Click the `Edit variables...` button 1. Click `New...` 1. Set the name to `oauth_id`, and the value to the value you want to use (description optional) 1. Click `OK`, the variable will appear in the list 1. Repeat steps 6-8 but use `oauth_secret` as the name and use the corresponding value 1. Click `OK` to close the edit variables dialog 1. Click `Cancel` to close the variable selection dialog 1. Click `Apply` to apply the changes to the run config
Run History > gcloud-eclipse-tools
A new instance of Eclipse launches with the plugin installed.
Updating Target Platforms
We use Target Platform files (
.target) to collect the dependencies used
for the build. These targets specify exact versions of the bundles and
features being built against. We currently maintain three target platforms,
targeting the latest version of the current, previous, and next releases.
This is currently:
- Eclipse Neon (4.6):
- Eclipse Oxygen (4.7):
- Eclipse Photon (4.8):
.target files are generated and should not be manually updated.
.target files directly becomes a chore once it has more than a
couple of dependencies. We instead generate these
Target Platform Definition
.tpd files use a simple DSL to specify the bundles and features,
and the location of the repositories containing them.
.tpd files are processed using the TPD Editor
which resolves the specified dependencies and creates a
The process is:
- Install the TPD Editor, if necessary
- Use Help > Install New Software and specify
http://mbarbero.github.io/fr.obeo.releng.targetplatform/p2/latest/as the location.
- Restart Eclipse when prompted
- Use Help > Install New Software and specify
- Open the
.tpdfile in Eclipse.
- Make any necessary changes and save.
- Note that the TPDs specify artifacts using their p2 identifiers.
Bundles are specified using their OSGi Bundle Symbolic Name (e.g.,
org.eclipse.core.runtime). Features are specified using their Feature ID suffixed with
- Note that the TPDs specify artifacts using their p2 identifiers. Bundles are specified using their OSGi Bundle Symbolic Name (e.g.,
- Select the file in the Package Explorer, right-click, and choose Create Target Definition File to update the corresponding .target file.
.target files should be committed.
The IDE Target Platform needs to be rebuilt at the command line and reimported into Eclipse when dependency versions are changed:
mvn -Pide-target-platform package
- Preferences > Plug-in Development > Target Platforms
- Select your target ("GCP IDE Target Platform") and click Edit
- Select the location and click Reload to cause any cached info to be discarded.
- Click Edit and then select Uncategorized.
- Finish / OK until done.
Updating the Eclipse IDE Target Platforms
The IDE Target Platform, defined in
may need to be updated when dependencies are added or removed. The
contents are defined in the
category.xml file, which specifies
the list of features and bundles that should be included. This
file can be edited using the Category editor in Eclipse. Ideally
the version should be specified as
"0.0.0" to indicate that the
current version found should be used. Unlike the
the identifiers are not p2 identifiers, and so features do not
Other Miscellaneous Dev Tasks
Updating IDE settings
eclipse/settings/ for details.
Configuring Maven/Tycho Toolchains for CI Builds
Note: this section is only relevant for configuring CI builds
We use Tycho's support for Maven Toolchains to ensure that Java 8
features do not creep into the code. This support is enabled by
compiling with the
setting that ensures bundles are compiled with a JDK that matches
Bundle-RequiredExecutionEnvironment, but configuring
tycho-surefire to run the tests using the configured toolchain
(the default for
require configuring Maven's toolchains
to point to appropriate JRE installations. Tycho further requires
that a toolchain defines an
id for the specified Execution
Environment identifier. For example, a
configure Maven for a Java 8 toolchain on a Mac might be:
<?xml version="1.0"?> <toolchains> <toolchain> <type>jdk</type> <provides> <id>JavaSE-1.8</id> <!-- the Execution Environment --> <version>1.8</version> <vendor>oracle</vendor> </provides> <configuration> <jdkHome>/Library/Java/JavaVirtualMachines/jdk1.8.0_155.jdk/Contents/Home/jre</jdkHome> </configuration> </toolchain> </toolchains>
Note that jdkHome above specifies the
jre/ directory: Tycho sets
the default boot classpath to jdkHome
/lib/endorsed/*. For many JDKs, including Oracle's JDK
and the OpenJDK, those directories are actually found in the
directory. Compilation errors such as
java.lang.String not found
java.lang.Exception not found
indicate a misconfigured jdkHome.