連接到數據庫GWT和奇怪的錯誤

我想estabilish在GWT（服務器端）連接到Oracle數據庫，這是我的代碼：連接到數據庫GWT和奇怪的錯誤

客戶端：

包com.db.client ;

import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.core.client.GWT; 
import com.google.gwt.user.client.rpc.AsyncCallback; 

/** 
* Entry point classes define <code>onModuleLoad()</code>. 
*/ 
public class Db_connection implements EntryPoint { 

private final GreetingServiceAsync greetingService = GWT 
     .create(GreetingService.class); 

/** 
* This is the entry point method. 
*/ 

public void onModuleLoad() { 
    greetingService.greetServer(new AsyncCallback<String>() { 
     public void onFailure(Throwable caught) { 
      System.out.println("FAILED"); 
     } 

     public void onSuccess(String result) { 
      System.out.println(result); 
     } 
    }); 
} 
}

接口（客戶端）：

package com.db.client; 

import com.google.gwt.user.client.rpc.RemoteService; 
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath; 

/** 
* The client side stub for the RPC service. 
*/ 
@RemoteServiceRelativePath("greet") 
public interface GreetingService extends RemoteService { 
     String greetServer() throws IllegalArgumentException; 
}

和：

package com.db.client; 

import com.google.gwt.user.client.rpc.AsyncCallback; 

/** 
* The async counterpart of <code>GreetingService</code>. 
*/ 
public interface GreetingServiceAsync { 
    void greetServer(AsyncCallback<String> callback) 
      throws IllegalArgumentException; 
}}

和服務器端：

package com.db.server; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 

import com.db.client.GreetingService; 
import com.google.gwt.user.server.rpc.RemoteServiceServlet; 
import oracle.jdbc.driver.*; 

public class GreetingServiceImpl extends RemoteServiceServlet implements 
     GreetingService { 

    public String greetServer() throws IllegalArgumentException { 
     String date = "data"; 

     try { 
      Class.forName("oracle.jdbc.OracleDriver"); 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     Connection conn = null; 
     try { 
      conn = DriverManager.getConnection(
        "jdbc:oracle:thin:@//localhost:1521/xe", "test", "test"); 
     } catch (SQLException e) { 
      e.printStackTrace(); 
     } 
     try { 
      Statement stmt = conn.createStatement(); 
      try { 
       ResultSet rset = stmt 
         .executeQuery("select BANNER from SYS.V_$VERSION"); 
       try { 
        while (rset.next()) 
         date = (rset.getString(1)); // Print col 1 
       } finally { 
        try { 
         rset.close(); 
        } catch (Exception ignore) { 
        } 
       } 
      } finally { 
       try { 
        stmt.close(); 
       } catch (Exception ignore) { 
       } 
      } 
     } catch (SQLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } finally { 
      try { 
       conn.close(); 
      } catch (Exception ignore) { 
      } 
     } 

     return date; 
    } 

}

和堆棧跟蹤：

java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory 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.jdbc.driver.OracleDriver.registerMBeans(OracleDriver.java:320) 
    at oracle.jdbc.driver.OracleDriver$1.run(OracleDriver.java:199) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at oracle.jdbc.driver.OracleDriver.<clinit>(OracleDriver.java:195) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Unknown Source) 
    at com.db.server.GreetingServiceImpl.greetServer(GreetingServiceImpl.java:20) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115) 
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) 
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) 
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:370) 
    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) 
2012-09-01 13:16:24 com.google.appengine.tools.development.ApiProxyLocalImpl log 
SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call 
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String com.db.client.GreetingService.greetServer() throws java.lang.IllegalArgumentException' threw an unexpected exception: java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve) 
    at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385) 
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) 
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) 
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) 
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60) 
    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:125) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$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.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:370) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at org.mortbay.jetty.Server.handle(Server.java:326) 
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
    at org.mortbay.jetty.HttpConnection$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$PoolThread.run(QueuedThreadPool.java:582) 
Caused by: java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve) 
    at java.security.AccessControlContext.checkPermission(Unknown Source) 
    at java.security.AccessController.checkPermission(Unknown Source) 
    at java.lang.SecurityManager.checkPermission(Unknown Source) 
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:283) 
    at java.lang.SecurityManager.checkConnect(Unknown Source) 
    at java.net.InetAddress.getAllByName0(Unknown Source) 
    at java.net.InetAddress.getAllByName(Unknown Source) 
    at java.net.InetAddress.getAllByName(Unknown Source) 
    at oracle.net.resolver.HostnameNamingAdapter.resolve(HostnameNamingAdapter.java:167) 
    at oracle.net.resolver.NameResolver.resolveName(NameResolver.java:133) 
    at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:416) 
    at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:687) 
    at oracle.net.ns.NSProtocol.connect(NSProtocol.java:247) 
    at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1102) 
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:320) 
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:546) 
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:236) 
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32) 
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521) 
    at java.sql.DriverManager.getConnection(Unknown Source) 
    at java.sql.DriverManager.getConnection(Unknown Source) 
    at com.db.server.GreetingServiceImpl.greetServer(GreetingServiceImpl.java:28) 
    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:115) 
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569) 
    ... 34 more

什麼，我做錯了什麼？感謝您的任何幫助。在您的項目

來源

2012-09-01 jrola

禁用應用程序引擎，如果你不打算在那裏部署應用程序。

來源

2012-09-01 12:25:42

是的，它可以工作，但是您還需要在Java Build Path中將GWT SDK上移到GAE之上。 – jrola

如何禁用應用程序引擎？ –

連接到數據庫GWT和奇怪的錯誤

回答

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