//// DO NOT EDIT THIS FILE. IT WAS GENERATED. Manual changes to this file will be lost when it is generated again. Edit the files in the src/main/asciidoc/ directory instead. ////
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Spring Cloud Config provides server-side and client-side support for externalized configuration in a distributed system. With the Config Server, you have a central place to manage external properties for applications across all environments.
The concepts on both client and server map identically to the Spring Environment
and PropertySource
abstractions, so they fit very well with Spring applications but can be used with any application running in any language.
As an application moves through the deployment pipeline from dev to test and into production, you can manage the configuration between those environments and be certain that applications have everything they need to run when they migrate.
The default implementation of the server storage backend uses git, so it easily supports labelled versions of configuration environments as well as being accessible to a wide range of tooling for managing the content.
It is easy to add alternative implementations and plug them in with Spring configuration.
== Features
=== Spring Cloud Config Server
Spring Cloud Config Server offers the following benefits:
@EnableConfigServer
=== Spring Cloud Config Client
Specifically for Spring applications, Spring Cloud Config Client lets you:
Environment
with remote property sources.@RefreshScope
for Spring @Beans
that want to be re-initialized when configuration changes./env
for updating Environment
and rebinding @ConfigurationProperties
and log levels.
** /refresh
for refreshing the @RefreshScope
beans.
** /restart
for restarting the Spring context (disabled by default).
** /pause
and /resume
for calling the Lifecycle
methods (stop()
and start()
on the ApplicationContext
).== Quick Start
This quick start walks through using both the server and the client of Spring Cloud Config Server.
First, start the server, as follows:
The server is a Spring Boot application, so you can run it from your IDE if you prefer to do so (the main class is ConfigServerApplication
).
Next try out a client, as follows:
The default strategy for locating property sources is to clone a git repository (at spring.cloud.config.server.git.uri
) and use it to initialize a mini SpringApplication
.
The mini-application's Environment
is used to enumerate property sources and publish them at a JSON endpoint.
The HTTP service has resources in the following form:
where application
is injected as the spring.config.name
in the SpringApplication
(what is normally application
in a regular Spring Boot app), profile
is an active profile (or comma-separated list of properties), and label
is an optional git label (defaults to master
.)
Spring Cloud Config Server pulls configuration for remote clients from various sources. The following example gets configuration from a git repository (which must be provided), as shown in the following example:
Other sources are any JDBC compatible database, Subversion, Hashicorp Vault, Credhub and local filesystems.
=== Client Side Usage
To use these features in an application, you can build it as a Spring Boot application that depends on spring-cloud-config-client (for an example, see the test cases for the config-client or the sample application).
The most convenient way to add the dependency is with a Spring Boot starter org.springframework.cloud:spring-cloud-starter-config
.
There is also a parent pom and BOM (spring-cloud-starter-parent
) for Maven users and a Spring IO version management properties file for Gradle and Spring CLI users. The following example shows a typical Maven configuration:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>{spring-boot-docs-version}</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>{spring-cloud-version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<!-- repositories also needed for snapshots and milestones -->
Now you can create a standard Spring Boot application, such as the following HTTP server:
@SpringBootApplication @RestController public class Application {
@RequestMapping("/")
public String home() {
return "Hello World!";
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
When this HTTP server runs, it picks up the external configuration from the default local config server (if it is running) on port 8888.
To modify the startup behavior, you can change the location of the config server by using application.properties
as shown in the following example:
By default, if no application name is set, application
will be used. To modify the name, the following property can be added to the application.properties
file:
NOTE: When setting the property ${spring.application.name}
do not prefix your app name with the reserved word application-
to prevent issues resolving the correct property source.
The Config Server properties show up in the /env
endpoint as a high-priority property source, as shown in the following example.
A property source called configserver:<URL of remote repository>/<file name>
contains the foo
property with a value of bar
.
NOTE: The URL in the property source name is the git repository, not the config server URL.
=== Sample Application
You can find a sample application https://github.com/spring-cloud/spring-cloud-config/tree/master/spring-cloud-config-sample[here].
It is a Spring Boot application, so you can run it by using the usual mechanisms (for instance, mvn spring-boot:run
).
When it runs, it looks for the config server on http://localhost:8888
(a configurable default), so you can run the server as well to see it all working together.
The sample has a test case where the config server is also started in the same JVM (with a different port), and the test asserts that an
environment property from the git configuration repo is present.
To change the location of the config server, you can set spring.cloud.config.uri
in bootstrap.yml
(or in system properties and other places).
The test case has a main()
method that runs the server in the same way (watch the logs for its port), so you can run the whole system in one process and play with it (for example, you can run the main()
method in your IDE).
The main()
method uses target/config
for the working directory of the git repository, so you can make local changes there and see them reflected in the running app. The following example shows a session of tinkering with the test case:
The refresh endpoint reports that the "sample" property changed.
== Building
:jdkversion: 1.8
=== Basic Compile and Test
To build the source you will need to install JDK {jdkversion}.
Spring Cloud uses Maven for most build-related activities, and you should be able to get off the ground quite quickly by cloning the project you are interested in and typing
NOTE: You can also install Maven (>=3.3.3) yourself and run the mvn
command
in place of ./mvnw
in the examples below. If you do that you also
might need to add -P spring
if your local Maven settings do not
contain repository declarations for spring pre-release artifacts.
NOTE: Be aware that you might need to increase the amount of memory
available to Maven by setting a MAVEN_OPTS
environment variable with
a value like -Xmx512m -XX:MaxPermSize=128m
. We try to cover this in
the .mvn
configuration, so if you find you have to do it to make a
build succeed, please raise a ticket to get the settings added to
source control.
For hints on how to build the project look in .travis.yml
if there
is one. There should be a "script" and maybe "install" command. Also
look at the "services" section to see if any services need to be
running locally (e.g. mongo or rabbit). Ignore the git-related bits
that you might find in "before_install" since they're related to setting git
credentials and you already have those.
The projects that require middleware generally include a
docker-compose.yml
, so consider using
https://docs.docker.com/compose/[Docker Compose] to run the middeware servers
in Docker containers. See the README in the
https://github.com/spring-cloud-samples/scripts[scripts demo
repository] for specific instructions about the common cases of mongo,
rabbit and redis.
NOTE: If all else fails, build with the command from .travis.yml
(usually
./mvnw install
).
=== Documentation
The spring-cloud-build module has a "docs" profile, and if you switch
that on it will try to build asciidoc sources from
src/main/asciidoc
. As part of that process it will look for a
README.adoc
and process it by loading all the includes, but not
parsing or rendering it, just copying it to ${main.basedir}
(defaults to ${basedir}
, i.e. the root of the project). If there are
any changes in the README it will then show up after a Maven build as
a modified file in the correct place. Just commit it and push the change.
=== Working with the code If you don't have an IDE preference we would recommend that you use https://www.springsource.com/developer/sts[Spring Tools Suite] or https://eclipse.org[Eclipse] when working with the code. We use the https://eclipse.org/m2e/[m2eclipse] eclipse plugin for maven support. Other IDEs and tools should also work without issue as long as they use Maven 3.3.3 or better.
==== Activate the Spring Maven profile Spring Cloud projects require the 'spring' Maven profile to be activated to resolve the spring milestone and snapshot repositories. Use your preferred IDE to set this profile to be active, or you may experience build errors.
==== Importing into eclipse with m2eclipse We recommend the https://eclipse.org/m2e/[m2eclipse] eclipse plugin when working with eclipse. If you don't already have m2eclipse installed it is available from the "eclipse marketplace".
NOTE: Older versions of m2e do not support Maven 3.3, so once the
projects are imported into Eclipse you will also need to tell
m2eclipse to use the right profile for the projects. If you
see many different errors related to the POMs in the projects, check
that you have an up to date installation. If you can't upgrade m2e,
add the "spring" profile to your settings.xml
. Alternatively you can
copy the repository settings from the "spring" profile of the parent
pom into your settings.xml
.
==== Importing into eclipse without m2eclipse If you prefer not to use m2eclipse you can generate eclipse project metadata using the following command:
$ ./mvnw eclipse:eclipse
The generated eclipse projects can be imported by selecting import existing projects
from the file
menu.
=== JCE
If you get an exception due to "Illegal key size" and you are using Sun’s JDK, you need to install the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files. See the following links for more information:
https://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html[Java 6 JCE]
https://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html[Java 7 JCE]
https://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html[Java 8 JCE]
Extract the JCE files into the JDK/jre/lib/security
folder for whichever version of JRE/JDK x64/x86 you use.
== Contributing
:spring-cloud-build-branch: master
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 https://cla.pivotal.io/sign/spring[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 https://github.com/spring-cloud/spring-cloud-build/blob/master/docs/src/main/asciidoc/code-of-conduct.adoc[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.
eclipse-code-formatter.xml
file from the
https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-dependencies-parent/eclipse-code-formatter.xml[Spring
Cloud Build] project. If using IntelliJ, you can use the
https://plugins.jetbrains.com/plugin/6546[Eclipse Code Formatter
Plugin] to import the same file..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..java
files (copy from existing files
in the project)@author
to the .java files that you modify substantially (more
than cosmetic changes).Fixes gh-XXXX
at the end of the commit
message (where XXXX is the issue number).=== Checkstyle
Spring Cloud Build comes with a set of checkstyle rules. You can find them in the spring-cloud-build-tools
module. The most notable files under the module are:
<1> Default Checkstyle rules <2> File header setup <3> Default suppression rules
==== Checkstyle configuration
Checkstyle rules are disabled by default. To add checkstyle to your project just define the following properties and plugins.
<reporting>
<plugins>
<plugin> <5>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
</plugin>
</plugins>
</reporting>
----
<1> Fails the build upon Checkstyle errors
<2> Fails the build upon Checkstyle violations
<3> Checkstyle analyzes also the test sources
<4> Add the Spring Java Format plugin that will reformat your code to pass most of the Checkstyle formatting rules
<5> Add checkstyle plugin to your build and reporting phases
If you need to suppress some rules (e.g. line length needs to be longer), then it's enough for you to define a file under ${project.root}/src/checkstyle/checkstyle-suppressions.xml
with your suppressions. Example:
It's advisable to copy the ${spring-cloud-build.rootFolder}/.editorconfig
and ${spring-cloud-build.rootFolder}/.springformat
to your project. That way, some default formatting rules will be applied. You can do so by running this script:
$ curl https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/.editorconfig -o .editorconfig
$ touch .springformat
=== IDE setup
==== Intellij IDEA
In order to setup Intellij you should import our coding conventions, inspection profiles and set up the checkstyle plugin. The following files can be found in the https://github.com/spring-cloud/spring-cloud-build/tree/master/spring-cloud-build-tools[Spring Cloud Build] project.
<1> Default Checkstyle rules <2> File header setup <3> Default suppression rules <4> Project defaults for Intellij that apply most of Checkstyle rules <5> Project style conventions for Intellij that apply most of Checkstyle rules
.Code style
Go to File
-> Settings
-> Editor
-> Code style
. There click on the icon next to the Scheme
section. There, click on the Import Scheme
value and pick the Intellij IDEA code style XML
option. Import the spring-cloud-build-tools/src/main/resources/intellij/Intellij_Spring_Boot_Java_Conventions.xml
file.
.Inspection profiles
Go to File
-> Settings
-> Editor
-> Inspections
. There click on the icon next to the Profile
section. There, click on the Import Profile
and import the spring-cloud-build-tools/src/main/resources/intellij/Intellij_Project_Defaults.xml
file.
.Checkstyle
To have Intellij work with Checkstyle, you have to install the Checkstyle
plugin. It's advisable to also install the Assertions2Assertj
to automatically convert the JUnit assertions
Go to File
-> Settings
-> Other settings
-> Checkstyle
. There click on the +
icon in the Configuration file
section. There, you'll have to define where the checkstyle rules should be picked from. In the image above, we've picked the rules from the cloned Spring Cloud Build repository. However, you can point to the Spring Cloud Build's GitHub repository (e.g. for the checkstyle.xml
: https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle.xml
). We need to provide the following variables:
checkstyle.header.file
- please point it to the Spring Cloud Build's, spring-cloud-build-tools/src/main/resources/checkstyle-header.txt
file either in your cloned repo or via the https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle-header.txt
URL.checkstyle.suppressions.file
- default suppressions. Please point it to the Spring Cloud Build's, spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml
file either in your cloned repo or via the https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml
URL.checkstyle.additional.suppressions.file
- this variable corresponds to suppressions in your local project. E.g. you're working on spring-cloud-contract
. Then point to the project-root/src/checkstyle/checkstyle-suppressions.xml
folder. Example for spring-cloud-contract
would be: /home/username/spring-cloud-contract/src/checkstyle/checkstyle-suppressions.xml
.IMPORTANT: Remember to set the Scan Scope
to All sources
since we apply checkstyle rules for production and test sources.