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Access denied for root@localhost to execute .jar file

 
Greenhorn
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Im trying to run a java client/server chatting project.

SOURCE : (*** http://undergroundim.net/download.php?p=1 http://undergroundim.net/how_to.php?p=9 *****)

which has .exe file. After running .exe file it ask for server IP/port number and username password to register,but it says server is offline or wrong server. I tried to install Mysql community server. I dont know how connect and start mysql server. after using... mysql -p -u root undergroundim < underground.im.sql

there is .bat file... after running it following error occurs.

java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: NO) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919) at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694) at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1244) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2397) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2430) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2215) at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:813) at com.mysql.jdbc.JDBC4Connection.(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.mysql.jdbc.Util.handleNewInstance(Util.java:411) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at net.undergroundim.server.networking.JDBC.(JDBC.java:42) at net.undergroundim.server.Server.(Server.java:44) at net.undergroundim.server.Server.main(Server.java:178) 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 org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58) Press any key to continue . . .
 
Rancher
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In MySQL, you need to grant the DB user "root" privileges to connect from "localhost". Start here: https://www.digitalocean.com/community/articles/how-to-create-a-new-user-and-grant-permissions-in-mysql
 
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