GWT RPC error

Hi everybody!!! Please, help me in solving my problem!!!

I have the standard simple project. The only customization which is
had been done by me is DB connection (actually Oracle 10g DataBase).
Of course I use the RPC mechanism. Data, retrieved from DB returning
from method with String type. When it's time to do for applicaton an
asyncronous method call, i receiving the such error message:

Initializing AppEngine server
The server is running at http://localhost:8888/
23.12.2009 12:33:21
com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: [1261571601567000] javax.servlet.ServletContext log: Exception
while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract java.lang.String
org.kamal.hello.client.HelloWorld.client.GreetingService.greetServer
(java.lang.String)' threw an unexpected exception:
java.lang.NoClassDefFoundError: java.net.Socket is a restricted class.
Please see the Google App Engine developer's guide for more details.
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:
487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter
(ServeBlobFilter.java:51)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:121)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
(DevAppEngineWebAppContext.java:70)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run
(BoundedThreadPool.java:442)
Caused by: java.lang.NoClassDefFoundError: java.net.Socket is a
restricted class. Please see the Google App Engine developer's guide
for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject
(Runtime.java:51)
at oracle.net.nt.TcpNTAdapter.connect(Unknown Source)
at oracle.net.nt.ConnOption.connect(Unknown Source)
at oracle.net.nt.ConnStrategy.execute(Unknown Source)
at oracle.net.resolver.AddrResolution.resolveAndExecute(Unknown
Source)
at oracle.net.ns.NSProtocol.establishConnection(Unknown Source)
at oracle.net.ns.NSProtocol.connect(Unknown Source)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:843)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:267)
at oracle.jdbc.driver.PhysicalConnection.<init>
(PhysicalConnection.java:413)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:164)
at oracle.jdbc.driver.T4CDriverExtension.getConnection
(T4CDriverExtension.java:34)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:752)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at
org.kamal.hello.client.HelloWorld.server.GreetingServiceImpl.greetServer
(GreetingServiceImpl.java:23)
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.appengine.tools.development.agent.runtime.Runtime.invoke
(Runtime.java:100)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse
(RPC.java:562)
... 30 more

Of course I tried to find a syntax error somewhere in my code, and
also error in my import statements but it all was useless,,, I really
can not find in Internet the appropriate solutions and all my hopes in
fixing this bug in my application are bind with all you!!! What is the
solution ?

P.S.: Sorry me for my English, it's not native for me .

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