Hi,
This is my first coding post so hopefully Im doing things the right
way..
I am developing a gwt app where I need mySQL connection. I think I
have grasped the whole client server thing ( RMI etc ).
In my server side code I am trying to establish a database connection
to mySQL using the JDBC driver. The errors are below. My setup is as
follows
OS: Ubuntu
GWT: GWT 2.2.0
SERVER: LAMP ( linux apache mySQL python )
Part of my application includes an Android app which communicates with
the mySQL via a php script passing the data to JSON.
Can anyone help with my errors? I have a feeling it may be something
to do with SOP ( single origin policy? ) . The code and error is
below.. Thanks.
public class MySQLConnection {
private Connection conn = null;
private String status;
private String url = "jdbc:mysql://localhost:3306/javabase";
private String user = "java";
private String pass = "d$7hF_r!9Y";
public MySQLConnection() {
Logger logger = Logger.getLogger("NameOfYourLogger");
logger.log(Level.SEVERE, "Good one. you made it to MYSQL
CONN!" );
System.out.println("Good one. you made it to tmysql conn");
try {
System.out.println("Loading driver...");
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Driver loaded!");
} catch (ClassNotFoundException e) {
throw new RuntimeException("Cannot find the driver in the
classpath!", e);
}
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection(url, user,
pass);
//conn =
DriverManager.getConnection( "jdbc:mysql://localhost/my_test_db?
user=root&password=083c3acak3");
Logger loggers =
Logger.getLogger("NameOfYourLogger");
loggers.log(Level.SEVERE, "We got DB
connection!" );
} catch (Exception e) {
String messageOut = "Unable to connect to database.
Exception message: " + e.getMessage();
System.out.println(messageOut);
e.printStackTrace();
// Server side log
//loggers.error(messageOut + "\n", e);
Logger loggers =
Logger.getLogger("NameOfYourLogger");
loggers.log(Level.SEVERE, "BUT were caught in an
exeption" );
//NEVER catch exceptions like this
}
}
}
Unable to connect to database. Exception message: Could not create
connection to database server.
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:
Could not create connection to database server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:
112)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:
120)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)
at com.mysql.jdbc.Util.getInstance(Util.java:382)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
at
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:
2413)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:
2163)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:
112)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:
120)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:
305)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.hanson.gwt.server.MySQLConnection.<init>(MySQLConnection.java:
40)
at org.hanson.gwt.server.MyServiceImpl.myMethod(MyServiceImpl.java:
10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
569)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
208)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
248)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
58)
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
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.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:351)
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.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
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.security.AccessControlException: access denied
(java.net.SocketPermission localhost resolve)
at
java.security.AccessControlContext.checkPermission(AccessControlContext.java:
374)
at
java.security.AccessController.checkPermission(AccessController.java:
546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:
532)
at com.google.appengine.tools.development.DevAppServerFactory
$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1031)
at java.net.InetAddress.getAllByName0(InetAddress.java:1146)
at java.net.InetAddress.getAllByName(InetAddress.java:1084)
at java.net.InetAddress.getAllByName(InetAddress.java:1020)
at
com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:
244)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:295)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:
2334)
at
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:
2371)
... 52 more
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