帶有Java/eclipse的Google Cloud SQL和Google App Engine：系統屬性rdbms.driver必須設置

我有一點問題，使用谷歌應用引擎訪問使用Google雲端SQL創建的數據庫。我覺得這個問題是關於我試圖使用的JSP文件，以及我的導入選項。我得到的錯誤如下：帶有Java/eclipse的Google Cloud SQL和Google App Engine：系統屬性rdbms.driver必須設置

HTTP ERROR 500 
Problem accessing /beer.jsp. Reason: 

    System property rdbms.driver must be set. 

Caused by: 
java.lang.IllegalStateException: System property rdbms.driver must be set. 
    at com.google.appengine.api.rdbms.dev.LocalRdbmsServiceLocalDriver.registerDriver(LocalRdbmsServiceLocalDriver.java:80) 
    at com.google.appengine.api.rdbms.dev.LocalRdbmsServiceLocalDriver.init(LocalRdbmsServiceLocalDriver.java:73) 
    at com.google.appengine.api.rdbms.dev.LocalRdbmsService.init(LocalRdbmsService.java:85) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.startServices(ApiProxyLocalImpl.java:581) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.access$700(ApiProxyLocalImpl.java:46) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl$2.run(ApiProxyLocalImpl.java:564) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl$2.run(ApiProxyLocalImpl.java:562) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.getService(ApiProxyLocalImpl.java:561) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.resolveDeadline(ApiProxyLocalImpl.java:233) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.doAsyncCall(ApiProxyLocalImpl.java:214) 
    at com.google.appengine.tools.development.ApiProxyLocalImpl.makeSyncCall(ApiProxyLocalImpl.java:147) 
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:101) 
    at com.google.appengine.api.rdbms.RdbmsApiProxyClient$ApiProxyBlockingInterface.makeSyncCall(RdbmsApiProxyClient.java:89) 
    at com.google.appengine.api.rdbms.RdbmsApiProxyClient$ApiProxyBlockingInterface.openConnection(RdbmsApiProxyClient.java:75) 
    at com.google.cloud.sql.jdbc.internal.SqlProtoClient.openConnection(SqlProtoClient.java:58) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:59) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:26) 
    at java.sql.DriverManager.getConnection(DriverManager.java:579) 
    at java.sql.DriverManager.getConnection(DriverManager.java:243) 
    at org.apache.jsp.beer_jsp._jspService(beer_jsp.java:66) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23) 
    at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:59) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:57) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$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$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:362) 
    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$RequestHandler.headerComplete(HttpConnection.java:923) 
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) 
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 


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我已經試過的事情，試圖解決這個問題，就像裝了MySQL連接器插入舉的項目，這會導致不同的錯誤。而且我覺得像這樣一個更接近我想要實現

HTTP ERROR 500 
Problem accessing /beer.jsp. Reason: 

    java.sql.SQLException: Communications link failure 

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 

Caused by: 
javax.servlet.ServletException: java.sql.SQLException: Communications link failure 

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 
    at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862) 
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791) 
    at org.apache.jsp.beer_jsp._jspService(beer_jsp.java:114) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23) 
    at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:59) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:57) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$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$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:362) 
    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$RequestHandler.headerComplete(HttpConnection.java:923) 
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) 
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 
Caused by: java.sql.SQLException: Communications link failure 

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 
    at com.google.cloud.sql.jdbc.internal.Exceptions.newSqlException(Exceptions.java:208) 
    at com.google.cloud.sql.jdbc.internal.SqlProtoClient.check(SqlProtoClient.java:158) 
    at com.google.cloud.sql.jdbc.internal.SqlProtoClient.openConnection(SqlProtoClient.java:60) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:59) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:26) 
    at java.sql.DriverManager.getConnection(DriverManager.java:579) 
    at java.sql.DriverManager.getConnection(DriverManager.java:243) 
    at org.apache.jsp.beer_jsp._jspService(beer_jsp.java:66) 
    ... 39 more 

Caused by: 
java.sql.SQLException: Communications link failure 

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 
    at com.google.cloud.sql.jdbc.internal.Exceptions.newSqlException(Exceptions.java:208) 
    at com.google.cloud.sql.jdbc.internal.SqlProtoClient.check(SqlProtoClient.java:158) 
    at com.google.cloud.sql.jdbc.internal.SqlProtoClient.openConnection(SqlProtoClient.java:60) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:59) 
    at com.google.cloud.sql.jdbc.Driver.connect(Driver.java:26) 
    at java.sql.DriverManager.getConnection(DriverManager.java:579) 
    at java.sql.DriverManager.getConnection(DriverManager.java:243) 
    at org.apache.jsp.beer_jsp._jspService(beer_jsp.java:66) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23) 
    at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:59) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:57) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
    at org.mortbay.jetty.servlet.ServletHandler$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$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:362) 
    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$RequestHandler.headerComplete(HttpConnection.java:923) 
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) 
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 


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而且我的web.xml文件

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
       http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
     version="2.5" 
     xmlns="http://java.sun.com/xml/ns/javaee"> 

    <!-- Servlets --> 
    <servlet> 
    <servlet-name>DBConnect</servlet-name> 
    <servlet-class>beer.client.DBConnect</servlet-class> 
    </servlet> 

    <servlet-mapping> 
    <servlet-name>DBConnect</servlet-name> 
    <url-pattern>/beer/good</url-pattern> 
    </servlet-mapping> 

    <!-- Default page to serve --> 
    <welcome-file-list> 
    <welcome-file>beer.jsp</welcome-file> 
    </welcome-file-list> 

</web-app>

最後我beer.jsp文件

<%@ page contentType="text/html;charset=UTF-8" language="java" %> 
<%@ page import="java.util.List" %> 
<%@ page import="java.sql.*" %> 
<%@ page import="com.google.appengine.api.rdbms.AppEngineDriver" %> 

<html> 
    <body> 

<% 
Connection c = null; 
c = DriverManager.getConnection("jdbc:google:rdbms://asu.edu:cst433team1:team1db/mysql"); 
ResultSet rs = c.createStatement().executeQuery("SELECT * FROM Beers"); %> 

<table style="border: 1px solid black"> 
<tbody> 
<tr> 
<th width="35%" style="background-color: #CCFFCC; margin: 5px">Name</th> 
<th style="background-color: #CCFFCC; margin: 5px">Message</th> 
<th style="background-color: #CCFFCC; margin: 5px">ID</th> 
</tr> <% 
while (rs.next()){ 
    int beerID = rs.getInt("beerID"); 
    int breweryID = rs.getInt("breweryID"); 
    String beerName = rs.getString("beerName"); 
    String style = rs.getString("Style"); %> 



<tr> 
    <td><%= beerID %></td> 
    <td><%= breweryID %></td> 
    <td><%= beerName %></td> 
</tr> 

<% } 
c.close(); %> 

</tbody> 
</table> 
<br /> 
No more messages! 
    </body> 
</html>

IM的結果在eclipse中使用這個API插件真的很新穎，所以我不知道我們可能需要什麼其他信息來弄清楚這裏發生了什麼。但如果這還不夠，我就可以提供任何東西。另外，我對信息含量模糊的情況表示歉意，這是我必須與自己一起工作的一種信息。

來源

2011-12-01 meriley

這是MySQL的問題，它dropps了一定的空閒時間後斷開連接（可能是默認情況下8小時）

所以，你需要執行任何虛擬的查詢，使連接定期居住或使用線程池

來源

2011-12-01 07:20:58

isnt beer.jsp查詢嗎？ SQL新手here.ResultSet rs = c.createStatement（）。executeQuery（「SELECT * FROM Beers」）; – meriley

但當時看起來連接已經被刪除了 –

在運行我的程序之前，我從API控制檯進行了一些手動查詢。相同的錯誤:( – meriley

我經歷了同樣的問題，幸運的是下面的解決方案幫助了我。

如果他們有正確的實例名稱，帳戶名稱和密碼，請檢查您的Google Cloud SQL設置。

Right_click - >谷歌 - >應用程序引擎 - >查看谷歌Cloud SQL的部分參考this link explains how to do cloud sql instance settings
也檢查你有。如果你確定數據庫訪問這個實例

來源

2013-09-04 06:58:10

創建，你可以檢查eclispe的設置。

項目名稱 - >谷歌 - >應用程序引擎設置 - >谷歌雲SQL

勾選「啓用谷歌雲SQL」，並設置一些東西。

例如實例名稱和數據庫名稱...等

來源

2013-11-12 09:29:22 Rita

帶有Java/eclipse的Google Cloud SQL和Google App Engine：系統屬性rdbms.driver必須設置

回答

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