I'm trying to make an java application to manage Linux servers from a web interface. It is a bad idea to perform each task by calling bash shell ? Are there any other options other than those to use C, Perl or another language? ...
The 'singleton-ness' of a class is an important aspect of how a class should be used. However, it usually doesn't have any explicit status in the exposed API of a class. Yes, conventional method names such as getInstance() are often used, but that's not exactly what I'm referring to here. A 'tag interface' is an interface which contains...
What are the best strategies to secure your GWT + Tomcat app to perform authentication and authorization? ...
given a CSV ant property, <property name="module.list" value="mod1,mod2,mod3,mod4,mod5"/> how can I just get the first element (ie "mod1" here)? I want to execute a command that will take in "mod1" as one of the arguments. Moreover.. I cannot modify this original "module.list" property to a list or anything else.. although I can crea...
If I have a java class which is package-private (declared with "class", not "public class"), there is really no difference if the methods inside are declared public or protected or package-private, right? So which should I use, or when should I use which? I'm a bit confused. ...
Is it acceptable for a J2EE container to provide an implementation that complies with the public review version of a JSR, as opposed to the final draft (or even proposed final draft) ? I'm not sure on how to quantify/qualify the word 'acceptable' in this context, but what would be the 'gold standard' for stating that an implementation is...
Before the advent of inkjet and laser printers, straight line drawings used to be plotted by coloured pens on large sheets of paper: the pens moved very slowly so this was a time-consuming process. Since time is money, it was important to draw figures in an optimal way, using minimum time. you will implement an A* search procedure for t...
Is there a Java method that works like Python's repr? For example, assuming the function were named repr, "foo\n\tbar".repr() would return "foo\n\tbar" not foo bar as toString does. ...
Does anyone know of mechanisms to automate the generation of security policy files for a Java application, especially that of J2EE/JEE applications? Are there tips that can be observed to generate accurate policy files without requiring an application to be rigorously tested with a near 100% coverage? ...
Hi all, I've got a java code that I found and adapted to my project. I am trying to build a java applet out of it. My problem is that from some reason the code demands me to add a JFrame to my applet. If I add a JFrame it works fine (The code has several threads its working on, perhaps it's connected?), the problem is that the JFrame ca...
Does anyone know how to create your own JPA provider? I was considering making a custom JPA provider that could interface with a SOAP webservice we use. However, I can't seem to find any document describing how to create your own JPA provider. Where should I start looking? ...
I want to parse a document that is not pure xml. For example my name is <j> <b> mike</b> </j> example 2 my name is <mytag1 attribute="val" >mike</mytag1> and yours is <mytag2> john</mytag2> Means my input is not pure xml. ITs simliar to html but the tags are not html. How can i parse it in java? ...
I'm working on a project involving enlisting a large number of relatively unskilled workers to do repetitive image analysis using ImageJ. I've written a set of macros which walk them through the analysis process, but in order to increase throughput and reduce errors, I'd like to figure out how to hide as much of the gui/menu interface as...
How can I handle an array in a prepared statement? i.e, I want to do a query and one of the parameters I get is an array of strings which I want to use in the query (Don't select rows that have a field that's in the array)? ...
I am facing problem in adding image at the end of the linear layout in android. Alwals it added at the begining. My question? 1)How to add this image at the end of the Layout. 2) After wards Can I add element from begining. ...
How can you realize the usage of JNDI , with an example if possible? ...
Hi. <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!--This is auto-generated file. Do not change it!--> <DB> <foo /> <bar /> </DB> I have one problem with it - when i start parsing (DOM) it says that document is not valid. I've checked what's wrong and the problem is: Line: 4 Column: 6 Error: Can not find declaration...
For exmple, i have undefined number of a pairs(key, value). And I want to build sorted list during iterate trough this pairs(it is long operation). I think to use a BinaryTree as a sorted structure and build list from tree after iterations. How you think in generally, is this method faster than simple sorting of the list getted from it...
How do you compare Java RPC vs Java Web Services. I have a small hands on experience with Web Services. Now I need to know how RPC compares with Web Services. How does RPC work? Addition : When do we go for either of the options? ...
I am working on an application where I need to integrate the search engine. This should do crawling also. Please suggest a good Java based search engine. Thank you in advance. ...