本地機器上的MySQL谷歌應用引擎 - 錯誤

Question

我正在使用Google App Engine編程本地計算機並將MySql連接到我的項目，當我嘗試連接到mysql時出現錯誤。 有什么想法嗎？ 谷歌搜索只提供了類似的東西： https ： //dba.stackexchange.com/questions/45029/mysql-exception-after-upgrading-from-java-6-to-java-7

INFO: Dev App Server is now running
java.sql.SQLException: Unable to initialize driver properties due to java.lang.IllegalAccessException: Class com.google.appengine.tools.development.agent.runtime.Runtime can not access a member of class com.mysql.jdbc.ConnectionPropertiesImpl with modifiers "private"
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
at com.mysql.jdbc.ConnectionPropertiesImpl.initializeProperties(ConnectionPropertiesImpl.java:2819)
at com.mysql.jdbc.ConnectionImpl.initializeDriverProperties(ConnectionImpl.java:3490)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:823)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:127)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:135)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at ru.onekilometre.SQLConnectionProvider.getInstance(SQLConnectionProvider.java:18)
at ru.onekilometre.OnekilometreServlet.doGet(OnekilometreServlet.java:19)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:123)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
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$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerServersFilter.doDirectRequest(DevAppServerServersFilter.java:369)
at com.google.appengine.tools.development.DevAppServerServersFilter.doDirectServerRequest(DevAppServerServersFilter.java:352)
at com.google.appengine.tools.development.DevAppServerServersFilter.doFilter(DevAppServerServersFilter.java:115)
at org.mortbay.jetty.servlet.ServletHandler$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:97)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:480)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$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)

連接代碼是：

package ru.onekilometre;

import java.sql.DriverManager;

import com.google.cloud.sql.jdbc.Connection;


public class SQLConnectionProvider {
public static Connection connection;
public static Connection getInstance() throws Exception {

      if (connection != null && !connection.isClosed()) {
        return connection;
      }
     // if (true) {
        //MySQL
        String url = "jdbc:mysql://localhost:3306/onekilometre";
        connection = (Connection) DriverManager.getConnection(url, "raiym", "password");
    /*  } else {
        // Google Cloud SQL
        DriverManager.registerDriver(new AppEngineDriver());
        String instanceName = "somename";
        connection = (Connection) DriverManager.getConnection("jdbc:google:rdbms://" + instanceName + "/NAME_DB");
      }*/
      return connection;
    }

}

Answer 1

就像Jaochim悲傷的問題是jre1.7.0_25我重新安裝到jre1.7.0_21並且它有效。 謝謝。

Answer 2

您應該從以下位置更改連接字符串：

"jdbc:mysql://localhost:3306/onekilometre"

到“jdbc：google：rdbms：// instance_name / database”

在這里您代替instance_name與你的谷歌雲SQL實例名稱和database與您的數據庫名稱。 請參閱https://developers.google.com/appengine/docs/java/cloud-sql/developers-guide#connect_and_post 。 例如，在我的應用程序中，我有：

"jdbc:google:rdbms://namibiaonthenet:namibiaonthenet/barcodeapp"

如果您在本地服務器上運行，App Engine會自動替換此字符串以連接到本地MySQL實例，這是根據您在轉到項目屬性時設置的設置進行的。 谷歌| App Engine | 谷歌可以SQL，然后單擊Configure 。 請記住選擇“ Use MySQL instance單選按鈕。

無需每次都更改連接字符串！ 如果在本地運行，則將使用本地實例。 如果您從Google服務器運行，則會使用雲實例。

Answer 3

我和jre1.7.0_25有同樣的問題，並通過升級到jre1.7.0_45來解決它。