How do i increase my key ID +1 for every new user

what iam trying to do is that for every new user that register on my app will get a key id.. that is +1 higher then the old highest id.. i have done this i JavaDB but in mysql i get an exception
here is my sql Q:
sql = "insert into " + mytest_TABLE + "(" + mytest_ID + ", " + mytest_NAME
+ ") values ((case when (select max(" + mytest_ID + ") from " + mytest_TABLE + ")"
+ "IS NULL then 1 else (select max(" + mytest_ID + ") from " + mytest_TABLE + ")+1 end), "
+ encodeSQL(firstName) + ")";
here is my exception:
by the way mytest is my table..
java.sql.SQLException: You can't specify target table 'mytest' for update in FROM clause
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3250)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1355)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1270)
at cont.tt.updateContact(tt.java:49)
at cont.tt.jButton3ActionPerformed(tt.java:179)
at cont.tt.access$200(tt.java:6)
at cont.tt$3.actionPerformed(tt.java:140)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6038)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
sry for my bad english..
really hope someone can help me out

You need an 'Identity' column. In MySQL, you need to enable autoincrement and don't insert a value in the column while adding records; MySQL will auto increment the value.
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How do i increase my key ID +1 for every new user

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