我使用GoogleAppEngine作为我的服务器。我在struts框架上编写了一个简单的jdbc应用程序（使用sql作为我的数据库）。但不知道为什么我无法正常运行它。 这是我得到的例外......
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
Here is the full error log that i got
[java] com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
[java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
[java] at java.lang.reflect.Constructor.newInstance(Unknown Source)
[java] at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:116)
[java] at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:124)
[java] at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
[java] at com.mysql.jdbc.Util.getInstance(Util.java:386)
[java] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
[java] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
[java] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
[java] at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
[java] at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2412)
[java] at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2154)
[java] at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
[java] at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
[java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
[java] at java.lang.reflect.Constructor.newInstance(Unknown Source)
[java] at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:116)
[java] at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:124)
[java] at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
[java] at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
[java] at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
[java] at java.sql.DriverManager.getConnection(Unknown Source)
[java] at java.sql.DriverManager.getConnection(Unknown Source)
[java] at com.cac.struts.InsertMethod.<init>(InsertMethod.java:19)
[java] at com.cac.struts.InsertAction.execute(InsertAction.java:23)
[java] at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
[java] at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
[java] at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
[java] at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
[java] at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
[java] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
[java] at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
[java] at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
[java] at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
[java] at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
[java] at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
[java] at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
[java] at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78)
[java] at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[java] at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:363)
[java] at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[java] at org.mortbay.jetty.Server.handle(Server.java:326)
[java] at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
[java] at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
[java] at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
[java] at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
[java] at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
[java] at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
[java] at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
[java] Caused by: java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)
[java] at java.security.AccessControlContext.checkPermission(Unknown Source)
[java] at java.security.AccessController.checkPermission(Unknown Source)
[java] at java.lang.SecurityManager.checkPermission(Unknown Source)
[java] at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:252)
[java] at java.lang.SecurityManager.checkConnect(Unknown Source)
[java] at java.net.InetAddress.getAllByName0(Unknown Source)
[java] at java.net.InetAddress.getAllByName0(Unknown Source)
[java] at java.net.InetAddress.getAllByName(Unknown Source)
[java] at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:247)
[java] at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
[java] at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2333)
[java] at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2370)
[java] ... 51 more
[java] java.lang.NullPointerException
[java] at com.cac.struts.InsertMethod.insert(InsertMethod.java:33)
[java] at com.cac.struts.InsertAction.execute(InsertAction.java:24)
[java] at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
[java] at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
[java] at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
[java] at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
[java] at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
[java] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
[java] at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
[java] at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
[java] at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
[java] at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
[java] at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
[java] at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
[java] at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
[java] at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
[java] at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78)
[java] at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[java] at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:363)
[java] at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
[java] at org.mortbay.jetty.Server.handle(Server.java:326)
[java] at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
[java] at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
[java] at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
[java] at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
[java] at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
[java] at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
[java] at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
这是我尝试过的Model类代码
package com.cac.struts;
import java.sql.*;
/**
*
* @author hablu
*/
public class InsertMethod {
Connection con=null;
public InsertMethod()
{
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost/test","root","");
//Class.forName("oracle.jdbc.driver.OracleDriver");
//con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","system","system");
}
catch(Exception e)
{
e.printStackTrace();
}
}
public boolean insert(int regd)
{
boolean b=false;
try
{
PreparedStatement ps=con.prepareStatement("select * from student where regd=?");
ps.setInt(1,regd);
ResultSet rs=ps.executeQuery();
while(rs.next())
{
b=true;
System.out.println("....."+rs.getString(1));
}
}
catch(Exception e)
{
e.printStackTrace();
}
return b;
}
}
答案 0 :(得分：0)
您的连接网址是什么？你在正确的港口连接？你可以发布一些代码吗？Mysql通常在3306端口上运行。
答案 1 :(得分：0)
谷歌应用引擎 - 谷歌的平台即服务工具 - 默认情况下不启用连接到关系数据库;相反，它提供了一个No-SQL DataStore（称为Bigtable）。
现在，Google正在测试GAE应用程序的RDBMS产品，并将其作为MySQL数据库实现。如果您是该服务的测试人员，则应使用Google的MySQL驱动程序（com.google.appengine.api.rdbms.AppEngineDriver）及其相应的JDBC连接URL（格式为jdbc：google：rdbms：// instance_name /留言）。更多信息here。