本地机器上的MySQL谷歌应用引擎 - 错误

Question

我正在使用Google App Engine编程本地计算机并将MySql连接到我的项目，当我尝试连接到mysql时出现错误。 有什么想法吗？ 谷歌搜索只提供了类似的东西： 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)

连接代码是：

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悲伤的问题是jre1.7.0_25我重新安装到jre1.7.0_21并且它有效。 谢谢。

Answer 2

您应该从以下位置更改连接字符串：

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

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

在这里您代替instance_name与你的谷歌云SQL实例名称和database与您的数据库名称。 请参阅https://developers.google.com/appengine/docs/java/cloud-sql/developers-guide#connect_and_post 。 例如，在我的应用程序中，我有：

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

如果您在本地服务器上运行，App Engine会自动替换此字符串以连接到本地MySQL实例，这是根据您在转到项目属性时设置的设置进行的。 谷歌| App Engine | 谷歌可以SQL，然后单击Configure 。 请记住选择“ Use MySQL instance单选按钮。

无需每次都更改连接字符串！ 如果在本地运行，则将使用本地实例。 如果您从Google服务器运行，则会使用云实例。

Answer 3

我和jre1.7.0_25有同样的问题，并通过升级到jre1.7.0_45来解决它。