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POTrouble using @Resource and JNDI lookup
 

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  1. POTrouble using @Resource and JNDI lookup
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    <p>I'm having trouble applying the concept of injection and also JNDI with EJBs and I'd like your help. I am learning this and I really want to understand and apply the techniques of @Resource and/or JNDI lookups with XML configuration. I can't seem to find any of the initial parameters in my JNDI lookups. Now, before I continue, if I manually enter the JNDI name of my datasource, everything works great. What I'm trying to do (again as an exercise) is use @Resource or JNDI to get the JNDI datasource name itself and then do a JNDI lookup on the datasource. I know that you can directly inject a DataSource object but if I can't inject a String, I gotta start with this.</p> <p>First, here's the important part of my ejb-jar.xml:</p> <pre><code>&lt;env-entry&gt; &lt;description&gt;DataSource JNDI lookup name&lt;/description&gt; &lt;env-entry-name&gt;datasourceName&lt;/env-entry-name&gt; &lt;env-entry-type&gt;java.lang.String&lt;/env-entry-type&gt; &lt;env-entry-value&gt;myDataSource&lt;/env-entry-value&gt; &lt;/env-entry&gt; </code></pre> <p>In terms of injection using @Resource I've tried I've tried the following field in the EJB</p> <pre><code>@Resource(name = "datasourceName") String dsName; </code></pre> <p>I've also tried with mappedName and lookup (using JNDI lookup) nothing is coming in. Then I've tried JNDI lookup as follows:</p> <pre><code> // get JNDI name from environment entry in EJB Context and use to lookup DataSource Context context = new InitialContext(); String dsName = (String) context.lookup("java:comp/env/SRS/datasourceName"); </code></pre> <p>(The name of the application is SRS) - This comes up with a NamingException that the JNDI lookup did not find anything. I've tried the following lookups:</p> <pre><code>String datasourceName = (String) context.lookup("java:comp/env/SRS/Status/datasourceName"); // name of EJB is Status String datasourceName = (String) context.lookup("datasourceName"); String datasourceName = (String) context.lookup("SRS/datasourceName"); String datasourceName = (String) context.lookup("SRS/Status/datasourceName"); String datasourceName = (String) context.lookup("java:global/SRS/datasourceName"); String datasourceName = (String) context.lookup("java:global/SRS/Status/datasourceName"); </code></pre> <p>My first post here so I hope I asked properly. Thanks for the help!</p>
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    1. COCheck here: http://stackoverflow.com/questions/6500632/how-to-lookup-jndi-resources-on-weblogic If it really is just `datasourceName` it seems like `context.lookup("datasourceName");` should be working. The other thing you can check is in the admin console, go to `Summary of Servers->your server name->View JNDI tree` and make sure your datasourceName is showing up.
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    2. CO@better_use_mkstemp - Thanks for responding. The datasource works out fine. Meaning, if I attempt a JNDI lookup for the datasource directly with the following code `DataSource ds = (DataSource) context.lookup("myDataSource");` I can access the datasource. What I'm trying to do here is use the XML configuration to supply a String directly to the EJB. I hope that clarified.
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    3. COIf `@Resource(name="datasourceName")` is used, then `java:comp/env/datasourceName` is the correct lookup string. That said, I don't know why the injection isn't working when the same name is specified in the annotation and XML; that should be working.
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