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POInjecting a Spring bean using CDI @Inject
 

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  1. POInjecting a Spring bean using CDI @Inject
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    <p>I'm trying to inject a bean defined in a Spring context into a CDI managed component but I'm not successful. The bean is not injected, instead a new instance gets created each time the injection should be performed. My environment is Tomcat 7 with JBoss Weld.</p> <p>The Spring ApplicationContext is straighforward:</p> <pre><code>&lt;beans&gt; ... &lt;bean id="testFromSpring" class="test.Test" /&gt; ... &lt;/bean&gt; </code></pre> <p>The CDI managed bean looks like this:</p> <pre><code>@javax.inject.Named("testA") public class TestA { @javax.inject.Inject private Test myTest = null; ... public Test getTest() { return this.myTest; } } </code></pre> <p>This is my <code>faces-config.xml</code></p> <pre><code>&lt;faces-config xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd" version="2.0"&gt; &lt;application&gt; &lt;el-resolver&gt;org.springframework.web.jsf.el.SpringBeanFacesELResolver&lt;/el-resolver&gt; &lt;/application&gt; &lt;/faces-config&gt; </code></pre> <p>However, when I access the <code>test</code> property from within a JSF page, a new <code>Test</code> instance is being created each time the access occurs. This is a simple example:</p> <pre><code>&lt;html&gt; ... &lt;p&gt;1: &lt;h:outputText value="#{testFromSpring}" /&gt;&lt;/p&gt; &lt;p&gt;2: &lt;h:outputText value="#{testA.test}" /&gt;&lt;/p&gt; ... </code></pre> <p>I get the following output:</p> <pre><code>1: test.Test@44d79c75 2: test.Test@53f336eb </code></pre> <p>After a refresh:</p> <pre><code>1: test.Test@44d79c75 2: test.Test@89f2ac63 </code></pre> <p>I can see that the first output is correct. No matter how often I refresh the page, the <code>testFromSpring</code> returns the value from the bean defined in the Spring context. However the second output clearly shows that each time the <code>getTest</code> method on the <code>test</code> components is invoked, a new <code>Test</code> instance is created and injected instead of using the instance from the Spring context as I would expect.</p> <p>So, what's the reason for this behaviour? </p> <p>How can I inject the bean from the Spring context into the CDI managed bean?</p> <p>I also tried using a qualifier using the name defined in the Spring context, but now an exception is thrown indicating, that the bean cannot be found:</p> <pre><code>org.jboss.weld.exceptions.DeploymentException: WELD-001408 Injection point has unsatisfied dependencies. Injection point: field test.TestA.myTest; Qualifiers: [@javax.inject.Named(value=testFromSpring)] </code></pre> <p>for the code</p> <pre><code>@javax.inject.Named("testA") public class TestA { @javax.inject.Inject @javax.inject.Named("testFromSpring") private Test myTest = null; </code></pre>
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    1. COThis could be lack of coffee here, but why inject a private member of your class (that is already set to null). Would it not be simpler to provide myTest as part of TestA's constructor (e.g. Constructor injection)
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      1. USMartijn Verburg
    2. COThe injection is just an example and not the point of the question.
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