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I am getting this when i try to launch our java server: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

But i have the mysql-connector-java-5.1.22-bin.jar in the same folder where the script is, and making this when i run the script: 

 java -cp mysql-connector-java-5.1.22-bin.jar -jar AvatarServer.jar

But still getting this. What to do? I am using af CentOS server.

 root@host [/home/nagoom/Server_Example]# java -cp mysql-connector-java-5.1.22-bin.jar -jar AvatarServer.jar ************************ ** FIRING UP SERVER! ** ************************ Running MySQLChatMessageSaver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at items.ItemsDatabase.DownloadData(ItemsDatabase.java:35) at items.ItemsDatabase.InitializeData(ItemsDatabase.java:24) at network.SocketHandler.startListening(SocketHandler.java:84) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at gameInstances.RoomController.DownloadRoomData(RoomController.java:46) at gameInstances.RoomController.InitializeRooms(RoomController.java:32) at network.SocketHandler.startListening(SocketHandler.java:85) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at gameInstances.RoomController.LoadLockedSeatsForAll(RoomController.java:121) at gameInstances.RoomController.InitializeRooms(RoomController.java:33) at network.SocketHandler.startListening(SocketHandler.java:85) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at gameInstances.RoomController.DownloadApartmentData(RoomController.java:89) at gameInstances.RoomController.InitializeRooms(RoomController.java:34) at network.SocketHandler.startListening(SocketHandler.java:85) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at gameInstances.RoomController.LoadItemsForAllRooms(RoomController.java:160) at gameInstances.RoomController.InitializeRooms(RoomController.java:35) at network.SocketHandler.startListening(SocketHandler.java:85) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at clothes.ClothesDatabase.DownloadGraphicsData(ClothesDatabase.java:42) at clothes.ClothesDatabase.InitializeGraphics(ClothesDatabase.java:31) at network.SocketHandler.startListening(SocketHandler.java:86) at server.AvatarServer.run(AvatarServer.java:44) MySQL exception: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver MySQL exception: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at moods.MoodsDatabase.DownloadData(MoodsDatabase.java:29) at moods.MoodsDatabase.InitializeData(MoodsDatabase.java:16) at network.SocketHandler.startListening(SocketHandler.java:89) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at robots.RobotHandler.downloadBots(RobotHandler.java:31) at network.SocketHandler.startListening(SocketHandler.java:90) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at levels.LevelDatabase.DownloadData(LevelDatabase.java:21) at network.SocketHandler.startListening(SocketHandler.java:91) at server.AvatarServer.run(AvatarServer.java:44) java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at database.DatabaseConnection.connect(DatabaseConnection.java:13) at network.SocketHandler.resetOnlineStatuses(SocketHandler.java:172) at network.SocketHandler.startListening(SocketHandler.java:93) at server.AvatarServer.run(AvatarServer.java:44)
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2 Answers 2

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-jar and -cp are mutually exclusive. -jar says: the classpath is the following jar, and all the libraries referenced in its manifest file. So you must use:

java -cp mysql-connector-java-5.1.22-bin.jar;AvatarServer.jar com.foo.bar.AvatarMainClass

or, if you want to run your app with -jar, reference the mysql driver jar in the jar's manifest file, as explained in the jar tutorial.

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2 Comments

Your example doesn't work. I am not Java familiar. It's a java source from my earlier programmer. I don't know what to do.
Define "does not work". You didn't use the class name com.foo.bar.AvatarMainClass literally, did you? If so, of course you must replace this class name with the actual main class you want to launch. The one that is referenced in the manifest file of the jar.
2

add mysql-connector-java-5.1.22-bin.jar to class-path in MANIFEST.MF file in AvatarServer.jar. Example: 

Class-Path: mysql-connector-java-5.1.22-bin.jar
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