How do I grant applications launched through JWS socket permission?

I have an application that needs two kinds of permissions, file permission to read from a text file
and a socket permission to connect to a SQL server.
I have solved the file permission by adding <all-permissions/> to my jnlp file but my application fails to connect to the SQL server.
I read somewhere that JWS doesn't allow custom policy files so I'm wondering how I can grant my application the permission. I also tried adding <j2ee-application-client-permissions/> to my jnlp file but with same results.
I'm using com.mysql.jdbc.Driver to connect to my SQL server and I have signed both the driver and my application's jar file.

It would help to see the stack trace of the exception which is thrown. Could you post that?

The trace file is considerably larger but I copy-pasted the bottom part.

security: JAVAWS AppPolicy Permission requested for: http://localhost/hbverk1/games/tetris/mysql-connector-java-5.1.7-bin.jar
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Internet Explorer TrustedPublisher certificate store
security: Loaded certificates from Internet Explorer TrustedPublisher certificate store
security: Validate the certificate chain using CertPath API
security: Obtain certificate collection in Root CA certificate store
security: Obtain certificate collection in Root CA certificate store
security: No timestamping info available
security: Found jurisdiction list file
security: No need to checking trusted extension for this certificate
security: The CRL support is disabled
security: The OCSP support is disabled
security: Checking if certificate is in Deployment denied certificate store
security: Checking if certificate is in Deployment permanent certificate store
Connecting to  ...
network: Connecting socket://localhost:3306 with proxy=DIRECT
java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:911)
	at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3953)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2048)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
	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.mysql.jdbc.Util.handleNewInstance(Util.java:406)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at DBdriver.connect(DBdriver.java:28)
	at DBdriver.getUsernameById(DBdriver.java:54)
	at Tetris.<init>(Tetris.java:55)
	at Tetris.main(Tetris.java:417)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.sun.javaws.Launcher.executeApplication(Unknown Source)
	at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
	at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
	at com.sun.javaws.Launcher.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
#### Java Web Start Error:
#### null

I tried running the application through command prompt with javaws tetris.jnlp and it works, but it won't if I run through the browser.

I figured it out, the problem was not permission issue. Webstart downloads the application from the server and then runs on the clients machine which causes a file not found exception since the logging information file required to connect to mysql could not be found in the firefox directory

I guess I need to rethink my approach as to how to connect to the database from the java application

What's this "logging information file"? I use MySQL and I never heard of such a thing.

It was supposed to say "login information file"
Its just a text file containing servername, databasename, username and password