Hi,
I have a class (Connection) on the server side that accesses the database
through hibernate. The connection on the server side is perfect. I want to use
RPC to call these methods on the client side. I then create an Implementation
class (ConnectionImpl) on the server that calls one of the methods of the
Connection class.ie the method connecto. Here is the Implementation class.
public class ConnectionImpl extends RemoteServiceServlet implements
ConnectionService{
/**
*
*/
private static final long serialVersionUID = 1L;
Connection con = new Connection(); /*The class that performs database access
through hibernate*/
public boolean connecto(String login, String password)throws
IllegalArgumentException{
return con.connect(login, password);//connect() returns a boolean
}
}
Then on the client side, I have the ConnectionService and
ConnectionServiceAsync interfaces:
public interface ConnectionService extends RemoteService {
boolean connecto(String login, String password)throws IllegalArgumentException;
}
and
public interface ConnectionServiceAsync {
void connecto(String login, String password, AsyncCallback<Boolean> callback)
throws IllegalArgumentException;
}
The web.xml conf file is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd";>
<web-app>
<!-- Servlets -->
<servlet>
<servlet-name>connectionServlet</servlet-name>
<servlet-class>com.server.ConnectionServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>connectionServlet</servlet-name>
<url-pattern>/webtop/connection</url-pattern>
</servlet-mapping>
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>Webtop.html</welcome-file>
</welcome-file-list>
</web-app>
But when I run and enter values to execute through rpc, I get the following
error:
SEVERE: [1273482832366000] javax.servlet.ServletContext log: Exception while
dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public
abstract boolean
com.extjs.gxt.samples.desktop.client.ConnectionService.connecto(java.lang.String,java.lang.String)
throws java.lang.IllegalArgumentException' threw an unexpected exception:
java.lang.NoClassDefFoundError: Could not initialize class
com.extjs.gxt.samples.desktop.server.HibernateSessionFactory
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:51)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at
com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
com.extjs.gxt.samples.desktop.server.HibernateSessionFactory
at
com.extjs.gxt.samples.desktop.server.BaseHibernateDAO.getSession(BaseHibernateDAO.java:13)
at com.extjs.gxt.samples.desktop.server.EvutiDAO.findAll(EvutiDAO.java:104)
at com.extjs.gxt.samples.desktop.server.Connection.getLogin(Connection.java:42)
at com.extjs.gxt.samples.desktop.server.Connection.connect(Connection.java:69)
at
com.extjs.gxt.samples.desktop.server.ConnectionServiceImpl.connecto(ConnectionServiceImpl.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:562)
... 30 more
Remote Procedure Call - Failure
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