Java Database Connectivity (JDBC)

hi there!
please tell me what's wrong or i'm doing wrong. i would like to know what's causing the java/DB connection's time out. it's drive me crazy and i'm out of ideas. MySQl and JAVA are both new for me.
i'm using mysql-standard-5.0.15-linux-i686-glibc23 and j2sdk1.4.2_10 on kubuntu 5.4
thanks


-after i execute this command:
____________________________________
root@kapverd:~/demo/commissioner# java -classpath "./revs_server.jar:./ext/mysql-connector-java-3.1.11-bin.jar:" -Djava.security.policy=conf/policy.txt inescID.revs.commissioner.Commissioner


-i'm asked to enter a username and and his password for the databases. after this i get this follow error and then i the options to create, redo, fill and delete the tables. obviously none of them woks.
the error message is like this:


com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: java.net.ConnectException: Connection timed out

STACKTRACE:

java.net.SocketException: java.net.ConnectException: Connection timed out
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2541)
at com.mysql.jdbc.Connection.<init>(Connection.java:1474)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at inescID.revs.database.CommonDatabase.connectDB(CommonDatabase.java:49)
at inescID.revs.database.CommonDatabase.DBInit(CommonDatabase.java:41)
at inescID.revs.database.DB_Commissioner.<init>(DB_Commissioner.java:86)
at inescID.revs.commissioner.Commissioner.start(Commissioner.java:73)
at inescID.revs.commissioner.Commissioner.start(Commissioner.java:63)
at inescID.revs.commissioner.Commissioner.<init>(Commissioner.java:36)
at inescID.revs.commissioner.Commissioner.main(Commissioner.java:88)


** END NESTED EXCEPTION **



Last packet sent to the server was 50 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2607)
at com.mysql.jdbc.Connection.<init>(Connection.java:1474)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at inescID.revs.database.CommonDatabase.connectDB(CommonDatabase.java:49)
at inescID.revs.database.CommonDatabase.DBInit(CommonDatabase.java:41)
at inescID.revs.database.DB_Commissioner.<init>(DB_Commissioner.java:86)
at inescID.revs.commissioner.Commissioner.start(Commissioner.java:73)
at inescID.revs.commissioner.Commissioner.start(Commissioner.java:63)
at inescID.revs.commissioner.Commissioner.<init>(Commissioner.java:36)
at inescID.revs.commissioner.Commissioner.main(Commissioner.java:88)