Having problem access the EJB 3 from Web Component
Hi ,
I have an EJB 3 entity AuctionItem and a session ItemProcessor only implements the local interface IItemProcessor, then I use a servlet to access the findAll method in the ItemProcessor. I've created a Enterprise Applicaiton project to contain the ejb jar and the war file, but after I deploy the ear successfully, I couldn't access to my servlet through http://localhost:8080/AuctionWeb/AuctionServlet, it keeps giving me error like follwoing. Do you know why, your help will be very appreciated !
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
at web.AuctionServlet.doGet(AuctionServlet.java:43)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
My code sample:
public class AuctionServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
@EJB
private IItemProcessor itemProcessor;
public AuctionServlet() {
super();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet AuctionServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet AuctionServlet at " + request.getContextPath () + "</h1>");
List items = itemProcessor.findAll();
for (Iterator it = items.iterator(); it.hasNext();) {
AuctionItem elem = (AuctionItem) it.next();
out.println(" <b>"+elem.getItemid()+" </b><br />");
out.println(elem.getTitle()+"<br /> ");
out.println("</body>");
out.println("</html>");
.....And the session bean is :
package sessions;
import javax.annotation.Resource;
import javax.ejb.Local;
import javax.ejb.Stateless;
import javax.persistence.*;
import javax.sql.DataSource;
import java.util.List;
import entities.AuctionItem;
@Stateless(name = "ItemProcessor")
public class ItemProcessor implements sessions.IItemProcessor {
@PersistenceContext
EntityManager entityManager;
public Long createItem(String title, Double value, String description,
String status) {
AuctionItem item = new AuctionItem();
item.setTitle(title);
item.setValue(value);
item.setDescription(description);
item.setStatus(status);
entityManager.persist(item);
return item.getItemid();
public String findItemByKey(Long id) {
AuctionItem item = entityManager.find(AuctionItem.class, id);
return item.getTitle();
public List findAll() {
return entityManager.createQuery("select object(o) from AuctionItem as o").getResultList();
}
The most common reason for this failure is if your web.xml does not refer to the latest web application
.xsd :
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http
://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/x
ml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
Otherwise, the web application is considered to be a J2EE 1.4 application and annotations
are not processed. If that's not the case you can also run the application through the
verifier to see if it identifies any issues.
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Dec 25, 2006 1:56:04 AM /userOut/Development Component (com.sap.ide.eclipse.component.provider.listener.DevConfListener) [Thread[ModalContext,5,main]] ERROR: john/wd: Build failed for sap.com/john/wd(MyComponents) in variant "default":
The Build terminated with errors
------------------------------------- Build log ------------------------------------------------------
Build Plugin Version: 1.6.3 (630_REL) from 03 November 2004 12:47:57
Start: 25.12.2006 01:56:03
Temp dir: C:Documents and Settingsjohn.dtcLocalDevelopmentt73950E79E943BFC31907C47C958D3CA9
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[mkdir] Created dir: C:Documents and Settingsjohn.dtcLocalDevelopmentDCssap.comjohnwd_compgendefaultdeploy
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[ddgen] [Info] Property vendor: sap.com
[ddgen] [Info] Property dcname: john/wd
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End: 25.12.2006 01:56:04 (Duration: 1 second)
Message was edited by:
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Table maintanence generator with events
Hi , I am having a custom table for which 2 new fields were added . Now the data for the two fields shold be populated depending on conditions using table maintanence generator . the two fields are : date and time. for every existing and new record t
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purchased a song from iTunes, i tried to transfer it to my itouch, but i received an error "iTunes could not copy because the file could not be converted". how do i convert the song (well, i thought it will automatically be converted)?