You’re basically physically including Tomcat 10.x specific libraries in WAR and then deploying the WAR to Tomcat 9.x. This is not the correct approach at all. Moreover, Tomcat 10.x was the first version to be Jakartified, not Tomcat 9.x. For Tomcat 9.x, which is based on Servlet 4.0, JSP 2.3, EL 3.0, WS 1.1 and … Read more
The compiler does not know that this won’t work: You could have a subclass of BlackInk that implements Printable. Then the cast would be fine. In situations where the compiler knows it won’t work, you will get an error. For example, if you make BlackInk final (so that there can be no subclasses) you get … Read more
This is because when you use toArray() it returns an Object[], which can’t be cast to a String[] (even tho the contents are Strings) This is because the toArray method only gets a List and not List<String> as generics are a source code only thing, and not available at runtime and so it can’t determine … Read more
By using a cast you’re essentially telling the compiler “trust me. I’m a professional, I know what I’m doing and I know that although you can’t guarantee it, I’m telling you that this animal variable is definitely going to be a dog.” Since the animal isn’t actually a dog (it’s an animal, you could do … Read more
I am not quite following your description of the program flow, but usually when you get ClassCastExceptions you cannot explain you have loaded the class with one classloader then try to cast it to the same class loaded by another classloader. This will not work – they are represented by two different Class objects inside … Read more
Straight from the API Specifications for the ClassCastException: Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. So, for example, when one tries to cast an Integer to a String, String is not an subclass of Integer, so a ClassCastException will be … Read more
Look at this line Caused by: java.lang.ClassCastException: android.support.design.widget.TextInputEditText cannot be cast to android.support.design.widget.TextInputLayout It tells you, you are trying to cast an object of type TextInputEditText to a TextInputLayout. Now, look at the next line: at com.myiscaeproject.az.myapp.activities.MainLogIn.initViews(MainLogIn.java:54) it tells you, it happens in line 54 of your MainLogIn.java file. Learn to read stack traces, it … Read more
You can better try with: a= (short)1; instead of a=a (short)1; ClassCastException is:- Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. Although in your code it is not making sense how you receive the ClassCastException even after if we change as … Read more