I've been looking for a simple java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated) . Ideally I would be able to specify a length depending ...
I'm attracted to the neatness that a single file database provides. What driver/connector library is out there to connect and use SQLite with Java. I've discovered a wrapper library, http://www.ch-werner.de/javasqlite, but are there other more prominent projects available? ...
In Java, static and transient fields are not serialized. However, I found out that initialization of static fields causes the generated serialVersionUID to be changed. For example, static int MYINT = 3; causes the serialVersionUID to change. In this example, it makes sense because different versions of the class would get different initi...
Is there any way in the Servlet API to access properties specified in web.xml (such as initialization parameters) from within a Bean or Factory class that is not associated at all with the web container? For example, I'm writing a Factory class, and I'd like to include some logic within the Factory to check a hierarchy of files and conf...
I've got some Java code using a servlet and Apache Commons FileUpload to upload a file to a set directory. It's working fine for character data (e.g. text files) but image files are coming out garbled. I can open them but the image doesn't look like it should. Here's my code: Servlet protected void doPost(HttpServletRequest request, ...
Is there a way to find the name of the program that is running in Java? The class of the main method would be good enough. ...
I have a Singleton/Factory object that I'd like to write a JUnit test for. The Factory method decides which implementing class to instantiate based upon a classname in a properties file on the classpath. If no properties file is found, or the properties file does not contain the classname key, then the class will instantiate a default im...
I searched for this subject on Google and got some website about an expert sexchange...so I figured I should just ask here instead. How do you embed a JApplet in html on a webpage? ...
I am writing an immutable DOM tree in Java, to simplify access from multiple threads.* However, it does need to support inserts and updates as fast as possible. And since it is immutable, if I make a change to a node on the N'th level of the tree, I need to allocate at least N new nodes in order to return the new tree. My question is,...
a colleague pointed me the other day to BCEL which , as best I can tell from his explanation and a quick read, a way to modify at run time the byte code. My first thought was that it sounded dangerous, and my second thought was that it sounded cool. Then I gave it some more thought and I recalled the codinghorror post on monkey-patchin...
I'm capturing data from a tablet using Java (JPen library rocks) and would like to be able to paint a penstroke in a more natural way. Currently I'm drawing the pen stroke as straight line segments each with a different Stroke thickness. There has to be something in Java's Graphics Library that lets me to this more efficiently. Righ...
We're currently using Lucene 2.1.0 for our site search and we've hit a difficult problem: one of our index fields is being ignored during a targeted search. Here is the code for adding the field to a document in our index: // Add market_local to index contactDocument.add( new Field( "market_local" , StringUtils.objec...
I will elaborate somewhat. Jsf is kind-of extremely painful for working with from designer's perspective, somewhat in the range of trying to draw a picture while having hands tied at your back, but it is good for chewing up forms and listing lots of data. So sites we are making in my company are jsf admin pages and jsp user pages. Proble...
I am looking for a simple tool to generate a DBUnit dataset from existing data in a database. Namely I need to be able to construct a query of a limited amount of that data, and just use these results for the dataset. Eclipse has a tool, but as far as I can tell, it only lets you pull all data out of a given table, but that is much too...
I am looking for a regex that will match a string that starts with one substring and does not end with a certain substring. Example: // Updated to be correct, thanks @Apocalisp ^foo.*(?<!bar)$ Should match anything that starts with "foo" and doesn't end with "bar". I know about the [^...] syntax, but I can't find anything that will ...
I was surprised to find today that I couldn't track down any simple way to write the contents of an input stream to an output stream in Java. Obviously, the byte buffer code isn't difficult to write, but I suspect I'm just missing something which would make my life easier (and the code clearer). So, given an InputStream in and an Output...
The login page in my Tapestry application has a property in which the password the user types in is stored, which is then compared against the value from the database. If the user enters a password with multi-byte characters, such as: áéíóú ...an inspection of the return value of getPassword() (the abstract method for the correspondin...
I'm more a Java developer than a .Net guy but It seems to me that new Microsoft MVC's framework seems like typical combination of Java existing projects like : Struts (for handling the MVC), Hibernate (for object to SQL mapping, like LINQ), and URL rewriting to handle pretty URLs (that's less common). Also, It seems to me very simila...
Here is my problem: I will provide the source code of my application as input and what I want as output is a visual representation of the relationship between classes, method calls etc. Is there some tool to do this? ...
I have a string representation of a date that I need to create an object from. I've looked through Date and Calendar API but haven't found anything that can do this other than creating my own ugly parse method. I know there must be a way, does anyone know of a solution? ...