هذا هو المشكل:

Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

java.sql.SQLNonTransientConnectionException: Cannot load connection class because of underlying exception: com.mysql.cj.exceptions.WrongArgumentException: Failed to parse the host:port pair 'localhost:chatserver'.

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:108)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:79)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:131)
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:231)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at dbsqlconnection.databaseconnection.main(databaseconnection.java:22)

Caused by: com.mysql.cj.exceptions.UnableToConnectException: Cannot load connection class because of underlying exception: com.mysql.cj.exceptions.WrongArgumentException: Failed to parse the host:port pair 'localhost:chatserver'. 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.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:103) ... 4 more Caused by: com.mysql.cj.exceptions.WrongArgumentException: Failed to parse the host:port pair 'localhost:chatserver'. 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.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:103) at com.mysql.cj.conf.ConnectionUrlParser.parseHostPortPair(ConnectionUrlParser.java:479) at com.mysql.cj.conf.ConnectionUrlParser.buildHostInfoResortingToGenericSyntaxParser(ConnectionUrlParser.java:417) at com.mysql.cj.conf.ConnectionUrlParser.parseAuthoritySegment(ConnectionUrlParser.java:246) at com.mysql.cj.conf.ConnectionUrlParser.parseAuthoritySection(ConnectionUrlParser.java:160) at com.mysql.cj.conf.ConnectionUrlParser.getHosts(ConnectionUrlParser.java:609) at com.mysql.cj.conf.ConnectionUrl.getConnectionUrlInstance(ConnectionUrl.java:187) at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:201) ... 3 more Caused by: java.lang.NumberFormatException: For input string: "chatserver" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at com.mysql.cj.conf.ConnectionUrlParser.parseHostPortPair(ConnectionUrlParser.java:477) ... 9 more