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Re: lookup a session bean inside a servlet
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created by <a href="http://community.jboss.org/people/bertoz84">stefano bertozzi</a> in <i>JNDI and Naming</i> - <a href="http://community.jboss.org/message/603275#603275">View the full discussion</a>
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<div class="jive-rendered-content"><p>Here's my BookShop ( EJB project ) structure:</p><p>     - Book entity bean</p><p>     - Utenti entity bean ( in english: Users )</p><p>     - OperazioniUtenti stateless session bean ( in english: UsersOperations )</p><p>     - OperazioniLibri stateless session bean ( in english: BooksOperations )</p><p>     - Carrello stateful session bean ( in english: Cart )</p><p>     - AccessoUtente stateful session bean ( in english: UserAccess )</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>this is the code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em>package bookshop.library.sessionbean;</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em>import java.util.Iterator;</em></p><p><em>import java.util.List;</em></p><p><em>import javax.ejb.Stateless;</em></p><p><em>import javax.ejb.TransactionAttribute;</em></p><p><em>import javax.ejb.TransactionAttributeType;</em></p><p><em>import javax.persistence.EntityManager;</em></p><p><em>import javax.persistence.PersistenceContext;</em></p><p><em>import bookshop.library.entitybean.*;</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em>@Stateless</em></p><p><em>public class OperazioniUtenti implements OperazioniUtentiLocal{</em></p><p><em>          @PersistenceContext</em></p><p><em>          EntityManager em;</em></p><p>  </p><p><em>          public static final String RemoteJNDIName =  OperazioniUtenti.class.getSimpleName() + "/remote";</em></p><p><em>          public static final String LocalJNDIName =  OperazioniUtenti.class.getSimpleName() + "/local";</em></p><p>  </p><p>  </p><p><em>          public OperazioniUtenti() {</em></p><p><em>          }</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>bla bla bla....</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>i have no problem in looking up it in my BookShop project ( inside AccessoUtente bean or in a simple testing java client )</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now again my somethingServlet inside my Web project:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">package webinterface.servlet;</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import java.io.IOException;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import java.io.PrintWriter;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.naming.Context;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.naming.InitialContext;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.naming.NamingException;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.RequestDispatcher;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.Servlet;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.ServletException;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.http.HttpServlet;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.http.HttpServletRequest;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import javax.servlet.http.HttpServletResponse;</em></p><p><strong style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;"><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import bookshop.library.entitybean.*;</em></strong></p><p><strong style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;"><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">import bookshop.library.sessionbean.*;</em></strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">public class somethingServlet extends HttpServlet </em><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">implements Servlet {</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">           static final long serialVersionUID = 1L;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">           static Context context;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">           static OperazioniUtenti opUser;</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">           static Utenti user;</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">          public somethingServlet() {</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                         super();</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">          }  </em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">protected void doPost(HttpServletRequest request, HttpServletResponse response) </em><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">throws ServletException, IOException {</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                    try</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                    {</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                                   context = new InitialContext();</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;"><strong style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                                   System.out.println(OperazioniUtentiLocal.class.toString());</strong> <span style="font-size: 8pt;">// print successfully INFO  [STDOUT] interface bookshop.library.sessionbean.OperazioniUtentiLocal</span></em></p><p><strong style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;"><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                                   opUser = (OperazioniUtenti) context.lookup("/BookShop/OperazioniUtenti/local");</em></strong></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                    } catch (NamingException e) {</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                                   e.printStackTrace();</em></p><p><em style="font-size: 13px; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">                    }</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>bla bla bla...</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>( ....I switched to Local from Remote....).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Lookup returns a null pointer because it can't find BookShop.</p><p>I read a lot about this problem but the best answer i found says to put my BookShop.jar inside MYWEBPROJECTPATH/WebContent/WEB_INF/lib and be sure to have it in the java build path of the web project ( that's what i did ). Here the links:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="jive-link-external-small" href="http://devpinoy.org/blogs/lamia/archive/2008/01/03/deploying-your-jar-with-your-war-in-eclipse.aspx">http://devpinoy.org/blogs/lamia/archive/2008/01/03/deploying-your-jar-with-your-war-in-eclipse.aspx</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="jive-link-external-small" href="http://webcache.googleusercontent.com/search?q=cache:aIWml4XYWCEJ:java.sun.com/j2ee/verified/packaging.html+add+jar+to+war&cd=6&hl=it&ct=clnk&gl=it&lr=lang_en|lang_it&source=www.google.it">http://webcache.googleusercontent.com/search?q=cache:aIWml4XYWCEJ:java.sun.com/j2ee/verified/packaging.html+add+jar+to+war&cd=6&hl=it&ct=clnk&gl=it&lr=lang_en|lang_it&source=www.google.it</a></p></div>
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