Since Java 5, the volatile keyword has release/acquire semantics to make side-effects visible to other threads (including assignments to non-volatile variables!). Take these two variables, for example: Note that i is a regular, non-volatile variable. Imagine thread 1 executing the following statements: At som…
Tag: java
White spaces are required between publicId and systemId
I am trying to make a ajax call to other domain locally from my computer by writing some proxy code in jsp. And this is my jQuery AJAX code that is calling proxy.jsp page. And my JSP file is:- And When I check the response, I am getting this error for the XML file it is parsing: And the XMl
Best way to play a radio stream ( shoutcast ) in Java?
I want to code an audio player in Java. java.JavaFX has a very nice support for mp3 playing but I want in my player also the possibility to listen to radio. The problem is I have searched for some time and I didn’t find something that works like I want: MP3SPI – this is nice but just wont play som…
java.net.UnknownHostException: Invalid hostname for server: local
What are the steps I should take to solve the error: I added the new virtual host name at Android emulator but the result returns to When I type my virtualhost URL on my PC, it works on display. Then again, when I ran on Emulator and check on Logcat, I couldn’t be able to read or check the HTTP
Java Security: Illegal key size or default parameters?
I had asked a question about this earlier, but it didn’t get answered right and led nowhere. So I’ve clarified few details on the problem and I would really like to hear your ideas on how could I fix this or what should I try. I have Java 1.6.0.12 installed on my Linux server and the code below ru…
REST API for Java?
I am preparing an application which is console based and the outcome of the application is a RDF/XML file which contains data of all my connections from LinkedIn. Now the problem is that my entire application is console based and I need to have a REST API so as to incorporate with my application. I am not awa…
Java CharAt() and deleteCharAt() performance
I’ve been wondering about the implementation of charAt function for String/StringBuilder/StringBuffer in java what is the complexity of that ? also what about the deleteCharAt() in StringBuffer/StringBuilder ? Answer For String, StringBuffer, and StringBuilder, charAt() is a constant-time operation. For…
How to export and save tables to .csv from access database in java
I am trying to export a lot of large tables from a MS Access db with java using the jdbc:odbc bridge. I wanted to save these tables to a CSV file first was wondering what would the best way to do this would be? any help would be appreciated. Answer Fetch the values and write a standard text file line
Embedded MongoDB when running integration tests
My question is a variation of this one. Since my Java Web-app project requires a lot of read filters/queries and interfaces with tools like GridFS, I’m struggling to think of a sensible way to employ MongoDB in the way the above solution suggests. Therefore, I’m considering running an embedded ins…
jsoup posting and cookie
I’m trying to use jsoup to login to a site and then scrape information, I am running into in a problem, I can login successfully and create a Document from index.php but I cannot get other pages on the site. I know I need to set a cookie after I post and then load it when I’m trying to open