You can use any Java compatible libraries with the Java runtime on the App Engine standard environment. These instructions use Apache Maven to build, run, and deploy a sample app. For details about installing Maven, see Using Apache Maven and the App Engine Plugin.
Declaring and managing dependencies
To manage dependencies using Maven, you need to specify the dependencies in
the <dependencies>
section inside the
pom.xml
file of your project.
To manage your project's dependency on Maven itself, you can use the
Maven Wrapper. If you do not use the
Maven Wrapper, App Engine defaults to using a recent version of Maven
when running gcloud app deploy
.
Private dependencies with Artifact Registry
If you need to host private dependencies for your Java app, you can use an Artifact Registry Maven repository. Connecting to a Maven repository hosted on Artifact Registry requires the Artifact Registry Maven Tools plugin for your Maven or Gradle configuration.
Specifying the Java servlet library
Eclipse Jetty and Tomcat apps require the Java servlet library. Specify it in
your pom.xml
file's <dependencies>
entry:
Using the Cloud Client Libraries
Cloud Client Libraries for Java provide idiomatic access to Google Cloud services. To use a library, declare it as a dependency.
Typically, you only declare dependencies on the specific libraries that your app needs. For example, to use the Cloud Storage library:
You can configure the Cloud Client Libraries for Java to handle authentication automatically.