I have two questions about Exceptions. Firstly, I got this message from my code… Exception in thread “main” java.lang.ArithmeticException: / by zero This error message means dividing by zero, such as by doing int a = 5 / 0; A method can throw an Exception class instance, can’t it? But this is an expression. Why … Read more
The problem is most likely that your application is using a relative pathname. As @BalusC says, relative pathnames can be problematic. But IMO, he goes way too far when he says “[y]ou should never use relative paths in java.io stuff”. When an application opens a file using (for example) the FileInputStream(File) constructor, relative pathnames are … Read more
The problem is in source So, you’ve got to change it to a proper one So do that, edit the source of the fxml file here AnchorPane root = (AnchorPane) FXMLLoader.load(Main.class.getResource(“LoginGUI.fxml”)); with this one AnchorPane root = (AnchorPane) FXMLLoader.load(Main.class.getResource(“/packagename
StringIndexOutOfBoundsException String index out of range: 0
java.lang.ClassNotFoundException:com.mysql.jdbc.Driver [duplicate]
You should add client option to your mysql-connector allowPublicKeyRetrieval=true to allow the client to automatically request the public key from the server. Note that allowPublicKeyRetrieval=True could allow a malicious proxy to perform a MITM attack to get the plaintext password, so it is False by default and must be explicitly enabled. https://mysql-net.github.io/MySqlConnector/connection-options/ you could also … Read more
This is not a synchronization problem. This will occur if the underlying collection that is being iterated over is modified by anything other than the Iterator itself. Iterator it = map.entrySet().iterator(); while (it.hasNext()) { Entry item = it.next(); map.remove(item.getKey()); } This will throw a ConcurrentModificationException when the it.hasNext() is called the second time. The correct … Read more
Throwing multiple exceptions in Java
