Java Forum

Having recently load-tested the application we are developing I noticed that one of the most expensive (time-wise) calls was my fetch of a db-connection from the defined db-pool. At present I fetch my connections using : private Connection getConnection() throws SQLException { try { Context jndiCntx = new InitialContext(); DataSource ds...

am I the only one to say that the java.nio. is bullshit? i have been trying to write some code using it to transfer file over the net. small file it is ok, big file -- problematic. java.lang.OutOfMemoryError at java.nio.Bits.reserveMemory(Unknown Source) at java.nio.DirectByteBuffer.<init>(Unknown Source)

Does anyone have any data comparing the speed of java double vs. float operations? According to a document I found on the Intel site, hardware support for 64 bit floating point was not added until the SSE2 Extensions on the Pentium IV and Xenon processors. I have the el cheapo Intel Celeron. (It reminds me of being on a diet and eating...

This seems so simple. I have an html form. The method is set to post. I have a simple servlet to test the communications. Whenever the submit button is pressed the form is sent to the servlet using get. Can anyone provide me leads on whether this is a problem with the browser, tomcat or some servlet configuration? I'm using mozilla...

Ok, I installed ANT, I have c:\ant in my ANT_HOME environment variable, I have c:\ant\bin in my PATH environmental variable, I installed the JAR files for TCL and for Javascript (Rhino)... to no avail!!! The EXACT same error occurs: org/apache/bsf/BSFManager Please Try The Following:

I have CF MX 6.1 with JRun running in the background. I want to be able to write JSP scripts as well as ColdFusion, however, I don't know how to do this (I can write JSP, but how to do it within ColdFusion framework is beyond me). Suggestions on where I can turn? I'm also interested in applying BSF tags; I downloaded the JAR and TLD files...

I've found several good examples out there on how to launch a web browser from a Java application, using the Runtime exec() command. However, what I'd like to do is configure the browser that's launched, as one would in an html link with the javascript onclick="window.open( 'http://www.mysite.com', 'mywindow',...

How would a java messaging system look if message exchange and formats, and actions are as described above. the sender and listener in Java, and the coordinator in C. all three processes must set a timeout on receives (no process should run for more than 2 minutes). if a listener for a given user name is invoked on another machine (or at...

I have been using MySql as the database using JSP's and JavaBeans but recently I have wanted to start using the database connection pooling mechanism built into TomCat. I think I am having a problem with defining my JDBC resource within Tomcat. I am pretty sure that my code is correct (but I am not certain), and the problem is with...

Can anyone suggest Java based WebServices project ideas for a Senior Year Project.

I need to get a better idea of how to do this, but my script at http://www.mycgiserver.com/~ppowell/tcltest.jsp fails: 500 Servlet Exception /~ppowell/tcltest.jsp:1: `http://jakarta.apache.org/taglibs/bsf-1.0' has no matching taglib-uri. The taglib uri must match a taglib-uri for a taglib specified in the web.xml or implicitly in a...

Took me a while to come up with this (even though it looks simple) it will convert a BGR color int (or long) like used in VB to a java Color (java.awt.Color) examples of this are: colornum = 16777215; //pure white colornum = 255; //pure red colornum = 65280; //pure green colornum = 16711680; //pure blue

Hi, I'm using Tomcat 7.2 and I'm trying to deploy an aplication that uses JSP and servlets. I'm actually trying to duplicate a production server but can't get it right. In the directory /whatever/java/tomcat4/webapps I have two other directories called ROOT and test. Under both ROOT and test there is a WEB-INF directory where web.xml file...

Looking for info on how the JVM handles memory. Is there a separate part of memory that handles JNI related activity? If the JVM process shows a memory leak, is it possible (based on monitoring the memory) to pinpoint if it is leaking with the Java code, JNI part or C module? Any information pertaining to monitoring the JVM and memory...

Hello, I am running Tomcat 4.x and have tried to set global error handling using the following kind of entries in the web.xml file. But there is no redirection and I always end up with the tomcat generated error page in the browser. Does anyone have a solution to this problem? <error-page>

Is there a way of retrieving all the methods from an object?? So if I load say a String... can I get all the available methods for that object? Thanks heaps, Tripharn

Dear Experts, I have a servlet that sends HTML page containing an applet down to the browser. The applet after init(), calls the servlet again to retrieve some info. How can I make sure in the servlet that call came from my applet and not from some hacked applet? I can pass some arguments from applet to servlet, but any hacker can do...

I'm developing an application that draws on several disk based images to create a composite image. I've noticed that my rendering time goes up as I load more images into memory. However, this seems to be due to the number of distinct images rather than the number of bytes they take up, since when I combine them into a single image in...

Using the JRE 1.3, and the "copy" button from the Java Console, on Windows, the copied text goes into the system clipboard. Using JRE 1.4.1 the copied text goes into a file like C:\Documents and Settings\YourUserName\.plugin141_05.trace Using JRE 1.4.2 I can't find where the text is going. Does anybody know where it goes? (Note also...

I can't for the life of me figure out where to download the Plugin Development Environment, which I understand is itself an eclipse plugin. This article looks great but doesn't provide a link: http://www.eclipse.org/articles/Article-PDE-does-plugins/PDE-intro.html

Hi, Is there any way that I can create a selectable image? I have tried using List and ChoiceGroup but this doesnt seem to give the results I require!. I want to create a menu list using images within a grid - similat to the VodaPhone Live service. Any advice examples?

We are developing a Web application on J2EE platform and require to support cetain peripheral devices such as MAGTEK PinPad and Card Swipe (http://www.magtek.com/) connected to a PC port. I am thinking of having two threads, one for reading from the port and one to write to the port. The whole purpose of doing this is to support the MAGTEK...

Hello all, I'm pretty new to the Java newsgroups so I apologize for dropping this into several maybe offtopic groups. I'm sorry! So on to my problem... I've come to a point in our RMI application where I need to have server callbacks to the client RMI applications. I've used the technique where the client passes an UnicastRemoteObject of...

What it means parsing? Can you give me a practical example. -- dk

Can someone outline where to get the jdo 1.0 reference implementation and can it be run on XPHome? I battled with a sample for 2 weeks and i am starting all over after set backs. Please advise! Thanks.