I was wondering how I could implement the simple factory pattern with Spring 3 annotations. I saw in the documentation that you can create beans that call the factory class and run a factory method. I was wondering if this was possible using annotations only. I have a controller that currently calls MyService…
Java Package Does Not Exist Error
So there’s a folder /usr/share/stuff in the root directory in stuff there are a bunch of java files with package org.name definitions at the top I am running javac test.java where test.java is in a subdomain I added /usr/share/stuff to my class path. and at the top of test.java I add import org.name But…
Can not find a (Map) Key deserializer for type [simple type, class …]
I have a domain object that has a Map: When I serialize the object, I get this: This Map’s key is a custom Object: So, I am not sure how to correct this exception I keep getting when I deserialize the object: How to correct this issue? I do not have access to the domain object to modify. Answer By
How do I remap the NumLock key in Java Swing?
You may have read my earlier question about remapping my keyboard at a low level in Java and I did find a solution – mostly. To be honest, I oversimplified the problem I was trying to solve. I not only want to match NumericKeypad 1-3 to 7-9 and vice versa, I want to remap the whole numeric keypad. In pa…
Java Error opening registry key
I get this error when I try to do anything with Java in command prompt: I did screw around with deleting Java directories and registry a few days ago. I restarted computer and java was still working fine, then i restarted it again today and now I get this error. I have tried uninstalling and reinstalling but …
How to get Scala List from Java List?
I have a Java API that returns a List like: I am using the below scala code: Now if I try scala syntax sugar like: it does not work. I get the error: It seems I need to convert Java List to Scala List. How to do that in above context? Answer EDIT: Note that this is deprecated since 2.12.0.
Bitwise operator for simply flipping all bits in an integer?
I have to flip all bits in a binary representation of an integer. Given: The output should be What is the bitwise operator to accomplish this when used with an integer? For example, if I were writing a method like int flipBits(int n);, what would go in the body? I need to flip only what’s already presen…
How to use Jackson to deserialise an array of objects
The Jackson data binding documentation indicates that Jackson supports deserialising “Arrays of all supported types” but I can’t figure out the exact syntax for this. For a single object I would do this: Now for an array I want to do this: Anyone know if there is a magic missing command? If …
Remove row being edited from JTable
I have a JTable and a button next to it that calls deleteSelectedRows(), which does exactly what it sounds like: But if a cell was in the act of being edited when it (and/or cells above it) were deleted, the edited cell stayed while the rest left, like this: And then trying to exit out of the editing threw an
Deserializing JSON into object with overloaded methods using Jackson
I am attempting to deserialize a JSON object stored in CouchDb using Jackson. This object needs to deserialize into a pojo that contains overloaded methods. When I attempt to retrieve the object from couch and do the deserialization I get the following exception: org.ektorp.DbAccessException: org.codehaus.jac…