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Spring Framework Utilities

This project intends to collect frequently requested utilities for and extensions to the Spring Framework.

Gradle Usage

repositories {
    mavenCentral()
}

dependencies {
    classpath 'com.trigonic:spring-utils:0.8'
}

Optional and Alternate Spring XML Imports

This feature allows you to optionally import specified resources if they exist, as well as importing alternate resources when the primary resource doesn't exist:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xutils="http://trigonic.com/schema/spring/xutils"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        
        http://trigonic.com/schema/spring/xutils http://trigonic.com/schema/spring/xutils.xsd">

    ...

    <!-- importing an optional resource -->
    <xutils:import resource="foo.xml" optional="true" />    

    <!-- importing a resource with an alternate if it doesn't exist -->
    <xutils:import resource="foo.xml" alternate="bar.xml" />    

    <!-- the same where both are optional -->
    <xutils:import resource="foo.xml" alternate="bar.xml" optional="true" />    

    ...
    
</beans>

Embedded Web Contexts

The EmbeddedWebContextConnector provides a connection between a running application's ApplicationContext and an embedded WebApplicationContext. This is very useful when running Jetty and Tomcat in embedded mode, as both the host application and the web application can share access to the same bean instances.

In the hosting application, add a EmbeddedWebContextRegistrar to the ApplicationContext (or manually call EmbeddedWebContextConnector.registerAppContext and EmbeddedWebContextConnector.unregisterAppContext) to register the ApplicationContext you want to use as the parent.

<bean class="com.trigonic.utils.spring.context.EmbeddedWebContextRegistrar">
    <property name="embeddedWebContext" value="foobar" />
</bean>

In the web application's web.xml, add EmbeddedWebContextConnector as a listener and set the embeddedWebContext context-param to the name registered in the outer application context:

<context-param>
    <param-name>embeddedWebContext</param-name>
    <param-value>foobar</param-value>
</context-param>

<listener>
    <listener-class>com.trigonic.utils.spring.context.EmbeddedWebContextConnector</listener-class>
</listener>

When the WebApplicationContext initializes, it will have the hosting ApplicationContext as a parent and will be able to leverage the beans defined there.