Google Cloud-SQL-Verbindung Fehler von localhost (Java-Eclipse)

Question

Ich versuche, mit Google Cloud SQL-Datenbank von einem Servlet in lokalen AppEngine Server gehostet zu verbinden. Ich kann eine Verbindung herstellen, wenn das Projekt auf der Google App-Engine bereitgestellt wird, aber nicht auf dem Localhost-Appengine-Server. Ich erhalte die folgenden Fehlermeldungen.

HTTP ERROR 500 

Problem accessing /. Reason: 
    java.lang.IllegalAccessError: com/google/appengine/repackaged/com/google/common/base/Platform 


Caused by: 
java.sql.SQLException: java.lang.IllegalAccessError: com/google/appengine/repackaged/com/google/common/base/Platform 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:877) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:873) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:443) 
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410) 
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328) 
    at java.sql.DriverManager.getConnection(DriverManager.java:571) 
    at java.sql.DriverManager.getConnection(DriverManager.java:233) 
    at com.example.appengine.cloudsql.CloudSqlServlet.doGet(CloudSqlServlet.java:88) 
    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:134) 
    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$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366) 
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349) 
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116) 
    at org.mortbay.jetty.servlet.ServletHandler$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:95) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:508) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at org.mortbay.jetty.Server.handle(Server.java:326) 
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
    at org.mortbay.jetty.HttpConnection$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.lang.IllegalAccessError: com/google/appengine/repackaged/com/google/common/base/Platform 
    at com.google.appengine.repackaged.com.google.common.base.Ticker$1.read(Ticker.java:69) 
    at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsedNanos(Stopwatch.java:178) 
    at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsed(Stopwatch.java:191) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LoadingValueReference.elapsedNanos(LocalCache.java:3665) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2382) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2337) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2295) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2208) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache.get(LocalCache.java:4062) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4066) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4995) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:5001) 
    at com.google.appengine.api.appidentity.AppIdentityServiceImpl.getAccessToken(AppIdentityServiceImpl.java:272) 
    at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential.intercept(AppIdentityCredential.java:98) 
    at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential$AppEngineCredentialWrapper.intercept(AppIdentityCredential.java:243) 
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:859) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460) 
    at com.google.cloud.sql.mysql.SslSocketFactory.obtainInstanceMetadata(SslSocketFactory.java:370) 
    at com.google.cloud.sql.mysql.SslSocketFactory.fetchInstanceSslInfo(SslSocketFactory.java:282) 
    at com.google.cloud.sql.mysql.SslSocketFactory.getInstanceSslInfo(SslSocketFactory.java:262) 
    at com.google.cloud.sql.mysql.SslSocketFactory.createAndConfigureSocket(SslSocketFactory.java:181) 
    at com.google.cloud.sql.mysql.SslSocketFactory.create(SslSocketFactory.java:150) 
    at com.google.cloud.sql.mysql.SocketFactory.connect(SocketFactory.java:47) 
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300) 
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251) 
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284) 
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083) 
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806) 
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526) 
    at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:140) 
    at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:148) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) 
    ... 42 more 


Caused by: 
java.lang.IllegalAccessError: com/google/appengine/repackaged/com/google/common/base/Platform 
    at com.google.appengine.repackaged.com.google.common.base.Ticker$1.read(Ticker.java:69) 
    at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsedNanos(Stopwatch.java:178) 
    at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsed(Stopwatch.java:191) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LoadingValueReference.elapsedNanos(LocalCache.java:3665) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2382) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2337) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2295) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2208) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache.get(LocalCache.java:4062) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4066) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4995) 
    at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:5001) 
    at com.google.appengine.api.appidentity.AppIdentityServiceImpl.getAccessToken(AppIdentityServiceImpl.java:272) 
    at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential.intercept(AppIdentityCredential.java:98) 
    at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential$AppEngineCredentialWrapper.intercept(AppIdentityCredential.java:243) 
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:859) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343) 
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460) 
    at com.google.cloud.sql.mysql.SslSocketFactory.obtainInstanceMetadata(SslSocketFactory.java:370) 
    at com.google.cloud.sql.mysql.SslSocketFactory.fetchInstanceSslInfo(SslSocketFactory.java:282) 
    at com.google.cloud.sql.mysql.SslSocketFactory.getInstanceSslInfo(SslSocketFactory.java:262) 
    at com.google.cloud.sql.mysql.SslSocketFactory.createAndConfigureSocket(SslSocketFactory.java:181) 
    at com.google.cloud.sql.mysql.SslSocketFactory.create(SslSocketFactory.java:150) 
    at com.google.cloud.sql.mysql.SocketFactory.connect(SocketFactory.java:47) 
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300) 
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251) 
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284) 
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083) 
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806) 
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526) 
    at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:140) 
    at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:148) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) 
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410) 
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328) 
    at java.sql.DriverManager.getConnection(DriverManager.java:571) 
    at java.sql.DriverManager.getConnection(DriverManager.java:233) 
    at com.example.appengine.cloudsql.CloudSqlServlet.doGet(CloudSqlServlet.java:88) 
    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$CachedChain.doFilter(ServletHandler.java:1157) 
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134) 
    at org.mortbay.jetty.servlet.ServletHandler$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:48) 
    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.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366) 
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349) 
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116) 
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:95) 
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:508) 
    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) 


Powered by Jetty:// 

Hier ist der Servlet-Code

package com.example.appengine.cloudsql; 

import java.io.IOException; 
import java.io.PrintWriter; 
import java.net.Inet4Address; 
import java.net.Inet6Address; 
import java.net.InetAddress; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Timestamp; 
import java.util.Date; 

import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential; 

// [START example] 
@SuppressWarnings("serial") 
public class CloudSqlServlet extends HttpServlet { 

    @Override 
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException, 
     ServletException { 
    String path = req.getRequestURI(); 
    if (path.startsWith("/favicon.ico")) { 
     return; // ignore the request for favicon.ico 
    } 
    // store only the first two octets of a users ip address 
    String userIp = req.getRemoteAddr(); 
    InetAddress address = InetAddress.getByName(userIp); 
    if (address instanceof Inet6Address) { 
     // nest indexOf calls to find the second occurrence of a character in a string 
     // an alternative is to use Apache Commons Lang: StringUtils.ordinalIndexOf() 
     userIp = userIp.substring(0, userIp.indexOf(":", userIp.indexOf(":") + 1)) + ":*:*:*:*:*:*"; 
    } else if (address instanceof Inet4Address) { 
     userIp = userIp.substring(0, userIp.indexOf(".", userIp.indexOf(".") + 1)) + ".*.*"; 
    } 
    GoogleCredential credential = GoogleCredential.getApplicationDefault(); 

    final String createTableSql = "CREATE TABLE IF NOT EXISTS visits (visit_id INT NOT NULL " 
     + "AUTO_INCREMENT, user_ip VARCHAR(46) NOT NULL, timestamp DATETIME NOT NULL, " 
     + "PRIMARY KEY (visit_id))"; 
    final String createVisitSql = "INSERT INTO visits (user_ip, timestamp) VALUES (?, ?)"; 
    final String selectSql = "SELECT user_ip, timestamp FROM visits ORDER BY timestamp DESC " 
     + "LIMIT 10"; 

    PrintWriter out = resp.getWriter(); 
    resp.setContentType("text/plain"); 
    String url; 
    if (System 
     .getProperty("com.google.appengine.runtime.version").startsWith("Google App Engine/")) { 
     // Check the System properties to determine if we are running on appengine or not 
     // Google App Engine sets a few system properties that will reliably be present on a remote 
     // instance. 
     url = System.getProperty("ae-cloudsql.cloudsql-database-url"); 
     try { 
     // Load the class that provides the new "jdbc:google:mysql://" prefix. 
     Class.forName("com.mysql.jdbc.GoogleDriver"); 
     } catch (ClassNotFoundException e) { 
     throw new ServletException("Error loading Google JDBC Driver", e); 
     } 
    } else { 
     // Set the url with the local MySQL database connection url when running locally 
     url = System.getProperty("ae-cloudsql.local-database-url"); 
    } 
    log("connecting to: " + url); 
    try (Connection conn = DriverManager.getConnection(url); 
     PreparedStatement statementCreateVisit = conn.prepareStatement(createVisitSql)) { 
     conn.createStatement().executeUpdate(createTableSql); 
     statementCreateVisit.setString(1, userIp); 
     statementCreateVisit.setTimestamp(2, new Timestamp(new Date().getTime())); 
     statementCreateVisit.executeUpdate(); 

     try (ResultSet rs = conn.prepareStatement(selectSql).executeQuery()) { 
     out.print("Last 10 visits:\n"); 
     while (rs.next()) { 
      String savedIp = rs.getString("user_ip"); 
      String timeStamp = rs.getString("timestamp"); 
      out.print("Time: " + timeStamp + " Addr: " + savedIp + "\n"); 
     } 
     } 
    } catch (SQLException e) { 
     throw new ServletException("SQL error", e); 
    } 
    } 
} 
// [END example] 

Answer 1

Bei der Entwicklung und vor Ort zu testen, haben Sie ein paar Möglichkeiten:

1. Zugriff auf einem lokalen MySQL-Server
2. Zugriff auf eine Wolke SQL-Instanz

Die J7 example ist so konfiguriert, dass sie den Google-MySQL-Treiber in der Cloud verwendet, der von der <use-google-connector-j>true</use-google-connector-j> in appengine-web.xml injiziert wird, und den Standard-MySQL-Treiber mit der Google SocketFactory bei lokaler Ausführung verwendet.

So führen Sie Ihre eigene lokale MySQL-Instanz, in WEB-INF/appengine-web.xml Änderung mit der ae-cloudsql.local-database-url Eigenschaft der Verbindungszeichenfolge für Ihre Datenbank, wahrscheinlich so etwas wie: jdbc:mysql:localhost:3306/${database}?user=${user}&password=${password}&useSSL=false (vorausgesetzt, Sie die Eigenschaften in Ihrem pom.xml oder mvn appengine:devserver -Duser=... -Dpassword=... -Ddatabase=... -D INSTANCE_CONNECTION_NAME=projectID:region:instance

Der Fehler, den Sie aktualisieren . sehen zu sagen, dass Ihre Verbindungszeichenfolge einen Treiber angeben, die nicht erkannt Wenn Sie sicher sind, dass alles gut ist, versuchen Sie könnten dann die folgende Zugabe (die nicht mehr benötigt werden soll): try { Class.forName("com.mysql.jdbc.Driver") } catch (ClassNotFoundException e) { ... }

Ich werde den Fahrer ex ausführen reichlich, aber es sollte funktionieren.