Hi
I am trying a web app that implements some EJB 3.1 calling showing the
results in JSP files.
And I am finding a strange issue that is some times the EJBs return a result
set and other times
return an EJBException. To call the EJBs I use a controller Servlet that
dispatches to the JSP files.
Here is the code of the EJBs,
@Stateless
@LocalBean
public class CallStoredProcedure implements java.io.Serializable {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public CallStoredProcedure() {
// TODO Auto-generated constructor stub
}
@SuppressWarnings("unchecked")
public List<Country> getCountriesSP(BigDecimal region)
throws Exception {
final Logger logger = Logger.getLogger("CallStoredProcedure");
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("JPACallingOracleStoredProcedure-jpa");
EntityManager em = emf.createEntityManager();
try {
EntityTransaction entr = em.getTransaction();
entr.begin();
JpaEntityManager jpaEntityManager =
JpaHelper.getEntityManager(em);
Session session = jpaEntityManager.getActiveSession();
StoredProcedureCall call = new StoredProcedureCall();
call.setProcedureName("HR.RECORD_SET.COUNTRIES_LIST");
call.addNamedArgumentValue("P_REGION", region);
call.useNamedCursorOutputAsResultSet("P_RESULTSET");
ObjectLevelReadQuery query = new
ReadAllQuery(Country.class);
query.addArgument("P_REGION");
query.setCall(call);
List<BigDecimal> queryArgs = new
ArrayList<BigDecimal>();
queryArgs.add(region);
return (List<Country>) session.executeQuery(query,
queryArgs);
} catch (Exception ex) {
logger.severe("ERROR: " + ex.getMessage());
throw ex;
} finally {
em.close();
}
}
}
that calls an Oracle Stored Procedure
And the following one,
@Stateless
@LocalBean
public class RegionsFacade implements java.io.Serializable {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public RegionsFacade() {
// TODO Auto-generated constructor stub
}
public HashMap<String, List<String>> findAll()
throws EJBException {
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("JPACallingOracleStoredProcedure-jpa");
EntityManager em = emf.createEntityManager();
HashMap<String, List<String>> hashMap = new HashMap<String,
List<String>>();
try {
javax.persistence.criteria.CriteriaQuery<Country> cq1 =
em.getCriteriaBuilder().createQuery(Country.class);
cq1.select(cq1.from(Country.class));
List<Country> listCountries = (List<Country>)
em.createQuery(cq1).getResultList();
javax.persistence.criteria.CriteriaQuery<Region> cq2 =
em.getCriteriaBuilder().createQuery(Region.class);
cq2.select(cq2.from(Region.class));
List<Region> allRegions = (List<Region>)
em.createQuery(cq2).getResultList();
for(Region r: allRegions){
List<String> myList = new ArrayList<String>();
BigDecimal myRegionId = new
BigDecimal(r.getRegionId());
for(Country c: listCountries){
if((c.getRegionId()).equals(myRegionId)){
myList.add(c.getCountryName());
}
}
hashMap.put(r.getRegionName(), myList);
}
} catch(EJBException ex) {
throw ex;
} finally {
em.close();
}
return hashMap;
}
public HashMap<BigDecimal, String> findAllRegions()
throws EJBException {
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("JPACallingOracleStoredProcedure-jpa");
EntityManager em = emf.createEntityManager();
HashMap<BigDecimal, String> hashMap = new HashMap<BigDecimal,
String>();
try {
javax.persistence.criteria.CriteriaQuery<Region> cq =
em.getCriteriaBuilder().createQuery(Region.class);
cq.select(cq.from(Region.class));
List<Region> list = (List<Region>)
em.createQuery(cq).getResultList();
for(Region r: list){
hashMap.put(new BigDecimal(r.getRegionId()),
r.getRegionName());
}
} catch (EJBException ex){
throw ex;
} finally {
em.close();
}
return hashMap;
}
}
that uses CriteriaQuery
Here is one of the exceptions they throw when do not work,
javax.ejb.EJBException
at
com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5194)
at
com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5092)
at
com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4880)
at
com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
at
com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
at
com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
at
com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at $Proxy241.findAll(Unknown Source)
at
ejb.__EJB31_Generated__RegionsFacade__Intf____Bean__.findAll(Unknown Source)
at controller.SPOutputServlet.doWork(SPOutputServlet.java:153)
at controller.SPOutputServlet.doPost(SPOutputServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at
org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:228)
at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
at
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
at
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
at
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalArgumentException: The type [null] is not the
expected [EntityType] for the key class [class entity.Region].
at
org.eclipse.persistence.internal.jpa.metamodel.MetamodelImpl.entity(MetamodelImpl.java:160)
at
org.eclipse.persistence.internal.jpa.querydef.AbstractQueryImpl.from(AbstractQueryImpl.java:97)
at ejb.RegionsFacade.findAll(RegionsFacade.java:49)
at sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at
org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
at
com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5367)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at
com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at
com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at
com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
at sun.reflect.GeneratedMethodAccessor108.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:862)
at
com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)
at
com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:371)
at
com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5339)
at
com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5327)
at
com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
... 32 more
And this is the controller Servlet,
//_at_WebServlet(name="SPOutputServlet", urlPatterns={"/SPOutputServlet"})
public class SPOutputServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
final Logger logger = Logger.getLogger("SPOutputServlet");
@EJB CallStoredProcedure callSP;
@EJB RegionsFacade regionsFacade;
/**
* @see HttpServlet#HttpServlet()
*/
public SPOutputServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request,
HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
// TODO Auto-generated method stub
doWork(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request,
HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
// TODO Auto-generated method stub
doWork(request, response);
}
@SuppressWarnings({ "unused", "static-access" })
protected void doWork(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
// TODO Auto-generated method stub
String allRegions = (String)
request.getParameter("allregions");
String showModal = (String) request.getParameter("showmodal");
if(allRegions.equals("0")) {
if(showModal.equals("0")){
HashMap<BigDecimal, String> hashMap = new
HashMap<BigDecimal, String>();
try {
hashMap = regionsFacade.findAllRegions();
} catch (Exception e) {
// TODO Auto-generated catch block
logger.severe("ERROR CALLING EJB: " +
e.getMessage());
request.setAttribute("exception", e);
request.getRequestDispatcher("/error.jsp").forward(request, response);
}
request.setAttribute("regions", hashMap);
request.getRequestDispatcher("/oneregion.jsp").forward(request, response);
} else if(showModal.equals("1")) {
String strRegion = (String)
request.getParameter("region");
if(strRegion != null) {
BigDecimal region = new
BigDecimal(Long.parseLong((String) request.getParameter("region")));
List<Country> list = new
ArrayList<Country>();
try {
list =
callSP.getCountriesSP(region);
} catch (Exception e) {
// TODO Auto-generated catch block
logger.severe("ERROR CALLING EJB: "
+ e.getMessage());
request.setAttribute("exception",
e);
request.getRequestDispatcher("/error.jsp").forward(request, response);
}
ServletOutputStream out =
response.getOutputStream();
out.println("<html>");
out.println("<head>");
out.println("<title>SPOutputServlet</title>");
out.println("<link
href='./css/default.css' rel='stylesheet' type='text/css' />");
out.println("<script
language='javascript'>");
out.println("function
goToIndex(){window.location='index.jsp';}");
out.println("function showModal(){");
out.println("var countries = new Array(");
int i = 0;
for(Country c: list){
if(i == list.size() - 1)
out.println("new Array('" +
c.getCountryName() + "', '" + c.getCountryId() + "'));");
else
out.println("new Array('" +
c.getCountryName() + "', '" + c.getCountryId() + "'), ");
i++;
}
out.println("var answer1 =
window.showModalDialog('modal.html', countries, " +
"'dialogWidth:300px;
dialogHeight:200px; center:yes');");
out.println("}");
out.println("</script>");
out.println("</head>");
out.println("<body>");
out.println("<table align='center'>");
int k=0;
for(Country c: list){
out.println("<tr class='tr" + (k %
2) + "'>");
out.println("<td class='col0'>" +
c.getCountryName() + "</td>" + "<td class='col1'>" + c.getCountryId() +
"</td>");
out.println("</tr>");
k++;
}
out.println("</table>");
out.println("<br/>");
out.println("<form>");
out.println("<table align='center'>");
out.println("<tr class='tr" + (k % 2) +
"'><td class='col0'><input id='idIndex' type='button' value='Go to Index'
onclick='javascript:goToIndex();'/></td>" +
"<td
class='col1'><input id='idModal' type='button' value='Open Modal'
onclick='javascript:showModal();'/></td></tr>");
out.println("</table>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
}
}
} else if(allRegions.equals("1")){
HashMap<String, List<String>> hashMap = new
HashMap<String, List<String>>();
try {
hashMap = regionsFacade.findAll();
} catch (Exception e) {
// TODO Auto-generated catch block
logger.severe("ERROR CALLING EJB: " +
e.getMessage());
request.setAttribute("exception", e);
request.getRequestDispatcher("/error.jsp").forward(request, response);
}
int max = hashMap.size();
Set<String> set = hashMap.keySet();
for(String region: set)
max += ((List<String>)
hashMap.get(region)).size();
List<String> countries = new ArrayList<String>();
if(showModal.equals("1")){
for(int h=1; h<=max; h++){
String country = (String)
request.getParameter("f_" + h);
if(country != null){
if(!hashMap.containsKey(country))
countries.add(country);
}
}
}
request.setAttribute("showmodal", showModal);
request.setAttribute("countries", countries);
request.setAttribute("hashMap", hashMap);
request.getRequestDispatcher("/allregions.jsp").forward(request,
response);
}
}
}
Why is this happening?
Kind regards,
Jose
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