Wierd ClassCastExeption. Do I always need to restart web logic server?
I salute the web development community and thank you in advance for taking the time to read my problem. I just started trying out Jdeveloper. While writing applications, as they become more complex I find myself with the annoying task of restarting the server every time I make changes in my code. For example: in a simple application, the user specifies the Country in an html form and the server gives it's cities in a jsp page. To do this I used the EJB beans to convert my database into entities and the created a Java service facade. My application is now working fine, but if I make even the tiniest change in the code, it totally crashes and I have to restart the server for the changes to take place. The question is: Do I have to start getting used to the annoying task of restarting the server every time I modify my code? Or due to the fact that I',m just starting out in Jdeveloper I might be doing something wrong. This is the exception that I get that causes the 500 internal server error:
java.lang.ClassCastException: model.countries cannot be cast to model.countries
at model.Service.getCountriesById(Service.java:143)
at control.ServletLoadCities.doPost(ServletLoadCities.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:326)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Wierd... why cant I cast model.countries to model.countries. They are the same class!
Thanks again for your help and time.
Michel
Hello pedja,
No, re-deploying the project doesn't work. What do you mean by Classloader issues?
This exception occours at the EntityManager class that talks with the database, right here:
/** <code>select o from Paises o where o.codigopais = :elCodigo</code> */
public Paises getPaisesFindPaisById(Object elCodigo) {
Paises elPais;
Object o = getEntityManager().createNamedQuery("Paises.findPaisById").setParameter("elCodigo", elCodigo).getResultList().get(0);
elPais = (Paises)o;
return elPais;
in: elPais = (Paises)o
If I call the method above within the same class nothing happens... It crashes when I call this method from a Servlet.
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