|
|
|
|
@ -1,45 +1,57 @@
|
|
|
|
|
# Spring Zero
|
|
|
|
|
|
|
|
|
|
Spring Zero is "Spring for Snowboarders". If you are kewl, or
|
|
|
|
|
just impatient, and you want to use Spring, then this is the place to
|
|
|
|
|
be. Spring Zero is a toolkit and runtime platform that will get
|
|
|
|
|
you up and running with Spring-powered, production-grade applications
|
|
|
|
|
and services with absolute minimum fuss. It takes an opinionated view
|
|
|
|
|
of the Spring family so that new and existing users can quickly get to
|
|
|
|
|
the bits they need. Assumes no knowledge of the Java development
|
|
|
|
|
ecosystem. Absolutely no code generation and no XML (unless you really
|
|
|
|
|
want it).
|
|
|
|
|
Spring Zero is "Spring for Snowboarders". If you are kewl, or just impatient, and you
|
|
|
|
|
want to use Spring, then this is the place to be. Spring Zero is the code-name for a
|
|
|
|
|
group of related technologies, that will get you up and running with
|
|
|
|
|
Spring-powered, production-grade applications and services with absolute minimum fuss.
|
|
|
|
|
It takes an opinionated view of the Spring family so that new and existing users can
|
|
|
|
|
quickly get to the bits they need. Assumes limited knowledge of the Java development
|
|
|
|
|
ecosystem. Absolutely no code generation and no XML (unless you really want it).
|
|
|
|
|
|
|
|
|
|
The goals are:
|
|
|
|
|
* Radically faster and widely accessible getting started experience for Spring
|
|
|
|
|
development
|
|
|
|
|
* Be opinionated out of the box, but get out of the way quickly as requirements start to
|
|
|
|
|
diverge from the defaults
|
|
|
|
|
* Provide a range of non-functional features that are common to large classes of projects
|
|
|
|
|
(e.g. embedded servers, security, metrics, health checks, externalized configuration)
|
|
|
|
|
* First class support for REST-ful services, modern web applications, batch jobs, and
|
|
|
|
|
enterprise integration
|
|
|
|
|
* Applications that adapt their behavior or configuration to their environment
|
|
|
|
|
* Optionally use Groovy features like DSLs and AST transformations to accelerate the
|
|
|
|
|
implementation of basic business requirements
|
|
|
|
|
|
|
|
|
|
* Radically faster and widely accessible getting started experience
|
|
|
|
|
for Spring development
|
|
|
|
|
* Be opinionated out of the box, but get out of the way quickly as
|
|
|
|
|
requirements start to diverge from the defaults
|
|
|
|
|
* Provide a range of non-functional features that are common to large
|
|
|
|
|
classes of projects (e.g. embedded servers, security, metrics,
|
|
|
|
|
health checks, externalized configuration)
|
|
|
|
|
* First class support for REST-ful services, modern web applications,
|
|
|
|
|
batch jobs, and enterprise integration
|
|
|
|
|
* Applications that adapt their behaviour or configuration to their
|
|
|
|
|
environment
|
|
|
|
|
* Optionally use Groovy features like DSLs and AST transformations to
|
|
|
|
|
accelerate the implementation of basic business requirements
|
|
|
|
|
|
|
|
|
|
## Installing
|
|
|
|
|
You need to build from source for now, but when it's done instructions will look like this:
|
|
|
|
|
You need to [build from source](#building-from-source) for now, but when it's done
|
|
|
|
|
instructions will look like this:
|
|
|
|
|
|
|
|
|
|
1) Get Java. Download and install the Java SDK from www.java.com
|
|
|
|
|
1) Get Java. Download and install the Java SDK from [www.java.com](http://www.java.com)
|
|
|
|
|
|
|
|
|
|
2) Get Spring
|
|
|
|
|
|
|
|
|
|
$ curl -s spring.cfapps.io/installer | bash
|
|
|
|
|
$ curl -s spring.cfapps.io/installer | bash
|
|
|
|
|
|
|
|
|
|
or use the [Windows installer](#installing)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## Building from source
|
|
|
|
|
Spring Zero can be [built with maven](http://maven.apache.org/run-maven/index.html) v3.0
|
|
|
|
|
or above.
|
|
|
|
|
|
|
|
|
|
$ mvn clean install
|
|
|
|
|
|
|
|
|
|
or use the Windows installer
|
|
|
|
|
An `alias` can be used for the Spring Zero command line tool:
|
|
|
|
|
|
|
|
|
|
3) Get to Work!
|
|
|
|
|
$ alias spr="java -jar ~/.m2/repository/org/springframework/zero/spring-cli/0.5.0.BUILD-SNAPSHOT/spring-cli-0.5.0.BUILD-SNAPSHOT.jar"
|
|
|
|
|
|
|
|
|
|
$ cat > app.groovy
|
|
|
|
|
_Also see [CONTRIBUTING.md](/CONTRIBUTING.md) if you want to submit pull requests._
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## Quick Start Example
|
|
|
|
|
The Spring Zero command line tool uses Groovy underneath so that we can present simple
|
|
|
|
|
snippets that can just run, for example:
|
|
|
|
|
|
|
|
|
|
$ cat > app.groovy
|
|
|
|
|
@Controller
|
|
|
|
|
class ThisWillActuallyRun {
|
|
|
|
|
@RequestMapping("/")
|
|
|
|
|
@ -48,21 +60,15 @@ You need to build from source for now, but when it's done instructions will look
|
|
|
|
|
return "Hello World!"
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
$ spring run app.groovy
|
|
|
|
|
$ curl localhost:8080
|
|
|
|
|
Hello World!
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## What? It's Groovy then? or like Grails? or Roo?
|
|
|
|
|
<ctrl-d>
|
|
|
|
|
$ spr run app.groovy
|
|
|
|
|
$ curl localhost:8080
|
|
|
|
|
Hello World!
|
|
|
|
|
|
|
|
|
|
There is a command line tool that uses Groovy underneath so that we
|
|
|
|
|
can present simple snippets that can just run just like the slimline
|
|
|
|
|
`app.groovy` example above. Groovy makes this really easy.
|
|
|
|
|
|
|
|
|
|
If you don't want to use the command line tool, or you would rather
|
|
|
|
|
work using Java and an IDE you can. Just add a `main()` method that
|
|
|
|
|
calls `SpringApplication` and add `@EnableAutoConfiguration`:
|
|
|
|
|
|
|
|
|
|
If you don't want to use the command line tool, or you would rather work using Java and
|
|
|
|
|
an IDE you can. Just add a `main()` method that calls `SpringApplication` and
|
|
|
|
|
add `@EnableAutoConfiguration`:
|
|
|
|
|
|
|
|
|
|
import org.springframework.stereotype.*;
|
|
|
|
|
import org.springframework.web.bind.annotation.*;
|
|
|
|
|
@ -82,108 +88,100 @@ calls `SpringApplication` and add `@EnableAutoConfiguration`:
|
|
|
|
|
SpringApplication.run(SampleController.class, args);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
_NOTE: the above example assumes your build system has imported the `spring-starter-web`
|
|
|
|
|
maven pom._
|
|
|
|
|
|
|
|
|
|
## Spring Zero Themes
|
|
|
|
|
|
|
|
|
|
There are a number of themes in Zero. Here are the important
|
|
|
|
|
ones:
|
|
|
|
|
## Spring Zero Components
|
|
|
|
|
There are a number of components in Zero. Here are the important ones:
|
|
|
|
|
|
|
|
|
|
### The Spring CLI
|
|
|
|
|
The 'spring' command line application compiles and runs Groovy source, making it super
|
|
|
|
|
easy to write the absolute minimum of code to get an application running. Spring CLI
|
|
|
|
|
can also watch files, automatically recompiling and restarting when they change.
|
|
|
|
|
|
|
|
|
|
*See [spring-cli/README.md](spring-cli/README.md).*
|
|
|
|
|
|
|
|
|
|
The 'spring' command line application compiles and runs Groovy source,
|
|
|
|
|
making it super easy to write the absolute minimum of code to get an
|
|
|
|
|
application running. Spring CLI can also watch files, automatically
|
|
|
|
|
recompiling and restarting when they change.
|
|
|
|
|
|
|
|
|
|
### Spring Bootstrap
|
|
|
|
|
The main library providing features that support the other parts of Spring Zero.
|
|
|
|
|
Features include:
|
|
|
|
|
|
|
|
|
|
* `SpringApplication` - a class with static convenience methods that make it really easy
|
|
|
|
|
to write a standalone Spring Application. Its sole job is to create and refresh an
|
|
|
|
|
appropriate Spring `ApplicationContext`.
|
|
|
|
|
* Embedded web applications with a choice of container (Tomcat or Jetty for now)
|
|
|
|
|
* First class externalized configuration support
|
|
|
|
|
|
|
|
|
|
The main library providing features that support the other parts of
|
|
|
|
|
Spring Zero. Features include:
|
|
|
|
|
_See [spring-bootstrap/README.md](spring-bootstrap/README.md)._
|
|
|
|
|
|
|
|
|
|
* `SpringApplication` - a class with static convenience methods that
|
|
|
|
|
make it really easy to write a standalone Spring Application. Its
|
|
|
|
|
sole job is to create and refresh an appropriate Spring
|
|
|
|
|
`ApplicationContext`.
|
|
|
|
|
* Embedded web applications with a choice of container (Tomcat or
|
|
|
|
|
Jetty for now)
|
|
|
|
|
|
|
|
|
|
### Spring Autoconfigure
|
|
|
|
|
Spring Zero can configure large parts of common applications based on detecting the
|
|
|
|
|
content of the classpath and any existing application context. A single
|
|
|
|
|
`@EnableAutoConfigure` annotation triggers auto-configuration of the Spring context.
|
|
|
|
|
|
|
|
|
|
Spring Zero can configure large parts of common applications based on
|
|
|
|
|
detecting the content of the classpath and any existing application
|
|
|
|
|
context:
|
|
|
|
|
|
|
|
|
|
* `@EnableAutoConfigure` is an annotation that triggers
|
|
|
|
|
auto-configuration of the Spring context. Auto-configuration
|
|
|
|
|
attempts to guess what beans a user might want based on their
|
|
|
|
|
classpath. For example, If a 'HSQLDB' is on the classpath the user
|
|
|
|
|
probably wants an in-memory database to be
|
|
|
|
|
defined. Auto-configuration will back away as the user starts to
|
|
|
|
|
define their own beans.
|
|
|
|
|
* `@Conditional` is an annotation in Spring 4.0 that allows you to
|
|
|
|
|
control which parts of an application are used at runtime. Spring
|
|
|
|
|
Zero provides some concrete implementations of conditional
|
|
|
|
|
configuration, e.g. `@ConditionalOnBean`,
|
|
|
|
|
`@ConditionalOnMissingBean` and `@ConditionalOnClass`.
|
|
|
|
|
Auto-configuration attempts to guess what beans a user might want based on their
|
|
|
|
|
classpath. For example, If a 'HSQLDB' is on the classpath the user probably wants an
|
|
|
|
|
in-memory database to be defined. Auto-configuration will back away as the user starts
|
|
|
|
|
to define their own beans.
|
|
|
|
|
|
|
|
|
|
### Spring Actuator
|
|
|
|
|
_See [spring-autoconfigure/README.md](spring-autoconfigure/README.md)._
|
|
|
|
|
|
|
|
|
|
Spring Actuator uses auto-configuration features to decorate
|
|
|
|
|
your application with features that make it instantly deployable and
|
|
|
|
|
supportable in production. For instance if you are writing a JSON web
|
|
|
|
|
service then it will provide a server, security, logging, externalized
|
|
|
|
|
configuration, management endpoints, an audit abstraction, and more.
|
|
|
|
|
If you want to switch off the built in features, or extend or replace
|
|
|
|
|
them, it makes that really easy as well.
|
|
|
|
|
|
|
|
|
|
### Service Wrappers and Deployability
|
|
|
|
|
|
|
|
|
|
Spring Zero helps you to take that last step from finishing a
|
|
|
|
|
development iteration to getting the code running in production.
|
|
|
|
|
Without having to think too much about it, other than choosing your
|
|
|
|
|
deployment environment (CentOS, Ubuntu, Windows etc) you should be
|
|
|
|
|
able to stand up an instance, or multiple instances, of your component
|
|
|
|
|
and have them fit seamlessly into the operating system environment.
|
|
|
|
|
### Spring Actuator
|
|
|
|
|
Spring Actuator uses auto-configuration to decorate your application with features that
|
|
|
|
|
make it instantly deployable and supportable in production. For instance if you are
|
|
|
|
|
writing a JSON web service then it will provide a server, security, logging, externalized
|
|
|
|
|
configuration, management endpoints, an audit abstraction, and more. If you want to
|
|
|
|
|
switch off the built in features, or extend or replace them, it makes that really easy as well.
|
|
|
|
|
|
|
|
|
|
### Spring Starters
|
|
|
|
|
_See [spring-actuator/README.md](spring-actuator/README.md)._
|
|
|
|
|
|
|
|
|
|
Spring Starters are a set of convenient dependency
|
|
|
|
|
descriptors that you can include in your application. You get a
|
|
|
|
|
one-stop-shop for all the Spring and related technology that you need
|
|
|
|
|
without having to hunt through sample code and copy paste loads of
|
|
|
|
|
dependency descriptors. For example, if you want to get started using
|
|
|
|
|
Spring and JPA for database access just include one dependency in your
|
|
|
|
|
project, and you are good to go.
|
|
|
|
|
|
|
|
|
|
## Building the code
|
|
|
|
|
Use maven to build the source code.
|
|
|
|
|
### Spring Starters
|
|
|
|
|
Spring Starters are a set of convenient dependency descriptors that you can include in
|
|
|
|
|
your application. You get a one-stop-shop for all the Spring and related technology
|
|
|
|
|
that you need without having to hunt through sample code and copy paste loads of
|
|
|
|
|
dependency descriptors. For example, if you want to get started using Spring and JPA for
|
|
|
|
|
database access just include one dependency in your project, and you are good to go.
|
|
|
|
|
|
|
|
|
|
$ mvn clean install
|
|
|
|
|
_See [spring-starters/README.md](spring-starters/README.md)._
|
|
|
|
|
|
|
|
|
|
## Importing into eclipse
|
|
|
|
|
You can use m2e or `maven eclipse:eclipse`.
|
|
|
|
|
|
|
|
|
|
Project specific settings are configured for source formatting. If you
|
|
|
|
|
are using m2e you can follow these steps to install eclipse support
|
|
|
|
|
for formatting:
|
|
|
|
|
### Packaging
|
|
|
|
|
The [spring-launcher](spring-launcher/) and
|
|
|
|
|
[spring-maven-packaging-plugin](spring-maven-packaging-plugin) provide a convenient way
|
|
|
|
|
to package you application for release. Applications can be released as a single jar
|
|
|
|
|
file that can simply be launched using `java -jar`.
|
|
|
|
|
|
|
|
|
|
* Select `Install new software` from the `help` menu
|
|
|
|
|
* Click `Add...` to add a new repository
|
|
|
|
|
* Click the `Archive...` button
|
|
|
|
|
* Select `org.eclipse.m2e.maveneclipse.site-0.0.1-SNAPSHOT-site.zip`
|
|
|
|
|
from the `eclipse` folder in this checkout
|
|
|
|
|
* Install "Maven Integration for the maven-eclipse-plugin"
|
|
|
|
|
_See [spring-launcher/README.md](spring-launcher/README.md) &
|
|
|
|
|
[spring-package-maven-plugin/README.md](spring-package-maven-plugin/README.md)._
|
|
|
|
|
|
|
|
|
|
Or if you prefer you can import settings manually from the `/eclipse` folder.
|
|
|
|
|
|
|
|
|
|
## Samples
|
|
|
|
|
The following samples are included. To run use `java -jar target/<archive>.jar`
|
|
|
|
|
|
|
|
|
|
* spring-zero-simple-sample - A simple command line application
|
|
|
|
|
* spring-zero-jetty-sample - Embedded Jetty
|
|
|
|
|
* spring-zero-tomcat-sample - Embedded Tomcat
|
|
|
|
|
* spring-zero-service-sample - Simple REST service with production features
|
|
|
|
|
* spring-batch-sample - Define and run a Batch job in a few lines of code
|
|
|
|
|
* spring-zero-data-sample - Spring Data JPA + Hibernate + HSQLDB
|
|
|
|
|
Groovy samples for use with the command line application are available in
|
|
|
|
|
[spring-cli/samples](spring-cli/samples/). To run the CLI samples type
|
|
|
|
|
`spr run <sample>.groovy` from samples directory.
|
|
|
|
|
|
|
|
|
|
Java samples are available in [spring-zero-sample](spring-zero-samples/) and should
|
|
|
|
|
be build with maven and run use `java -jar target/<sample>.jar`. The following java
|
|
|
|
|
samples are provided:
|
|
|
|
|
|
|
|
|
|
* spring-zero-sample-simple - A simple command line application
|
|
|
|
|
* spring-zero-sample-tomcat - Embedded Tomcat
|
|
|
|
|
* spring-zero-sample-jetty - Embedded Jetty
|
|
|
|
|
* spring-zero-sample-actuator - Simple REST service with production features
|
|
|
|
|
* spring-zero-sample-actuator-ui - A web UI example with production features
|
|
|
|
|
* spring-zero-sample-web-ui - A thymeleaf web application
|
|
|
|
|
* spring-sample-batch - Define and run a Batch job in a few lines of code
|
|
|
|
|
* spring-sample-data-jpa - Spring Data JPA + Hibernate + HSQLDB
|
|
|
|
|
* spring-zero-sample-integration - A spring integration application
|
|
|
|
|
* spring-zero-sample-profile - example showing Spring's `@profile` support
|
|
|
|
|
* spring-zero-sample-traditional - shows Spring Zero with more traditional WAR packaging
|
|
|
|
|
(but also executable using `java -jar`)
|
|
|
|
|
* spring-zero-sample-xml - Example show how Spring Zero can be mixed with trditional XML
|
|
|
|
|
configuration
|
|
|
|
|
|
|
|
|
|
|
Phillip Webb
12 years ago