I'm trying to use XMLTask 1.16, but, unfortunately, I got error,
java.lang.UnsupportedClassVersionError: Bad version number in .class file, all the time. But if I switch back to XMLTask 1.15, it work fine. Does anyone know how to make XMLTask 1.16 work with Ant.
Programming challenge: Given a set of integers [1, 2, 3, 4, 5] I would like to generate all possible k-combinations in ascending size order in Java; e.g.
[1], [2], [3], [4], [5], [1, 2], [1, 3] ... [1, 2, 3, 4, 5]
It is fairly easy to produce a recursive solution that generates all combinations and then sort them afterwards but I imagine there's a more efficient way that removes the need for the additional sort.
Im getting classnotfountexception on Class.forname("com.mysql.jdbc.Driver")
im using:
windows vista 64-bit,
Eclipse Galileo,
GWT framework
i downloaded (mysql-connector-java-5.1.6-bin), but what the exact path i should add to.
im getting this exception while im in gwt-projects, but normal projects working good,
any idea how that should be done???...thanks
Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??
Hi..i wanted to develop a whiteboard application..i know the basics of java..but have no idea where to start from..so..i'd really appreciate if you could guide me..as in..where do i start from??..plz...i reallly need ths..
I am new to web development, I have to create a web application in Java using GWT that connects to a database and download a file from it. Regardless of the type of database, what does the web application need in order to create a connection with the database? E.g. an API
I am new to Java Script. I am using it, in combination with Java Server Faces.
I want to add some points to define a Polilyne using GoogleMaps Apiv3. My problem is that I can't add a FOR statement to the javascript, because it dumps. If I comment this FOR loop, it also dumps. The dump I am getting is: "javax.servlet.ServletException: null source".
Has anyone any suggestion to solve this? Thanks in advance, Emanuel
<script type="text/javascript">
function initialize()
{
var longit = "${dateRange.longitude}" ;
var lat = "${dateRange.latitude}" ;
var latlng = new google.maps.LatLng(lat, longit);
var myOptions =
{
zoom: 15,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var points = [];
var cadena1 = "${dateRange.latArray}" ;
var cadena2 = "${dateRange.longArray}" ;
var latArray = cadena1.split('?');
var longArray = cadena2.split('?');
/* The code Below is the one that fails */
for (var i=0; i < latArray.length; i++)
{
points.push(new google.maps.LatLng(latArray[i], longArray[i]));
}
/* Finish of the error code */
// The Polilyne is created
var mapPath = new google.maps.Polyline
({
path: points,
strokeColor: "#FF0000",
strokeOpacity: 1.0,
strokeWeight: 4
});
mapPath.setMap(map);
}
</script>
</head>
<body onload="initialize()">
<h:graphicImage url="http://localhost:8080/gps_tracking/faces/resources/images/logo.jpg">
</h:graphicImage>
<h1 align="center">Sol-Tech</h1><br />
<hr></hr>
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
I always thought that varibales are mapped to stack locations once your Java source is compiled; additionally, they may include the info about the variable names and their scope in classfiles, but that's optional AFAIK.
The question is - how do my Eclipse/IDEA IDEs allow me to set a watch expression containing the local variable name? To me, it's hard to understand :)
Resolving an xpath that includes namepsaces in Java appears to require the use of a NamespaceContext object, mapping prefixes to namespace urls and vice versa. But I can find no mechanism for getting a NamespaceContext other than implementing it myself. This seems counter-intuitive. Is there any easy way to acquire a NamespaceContext from a document, or to create one, or failing that, to forgo prefixes altogether and specify the xpath with fully qualified names?
Hi All,
I have decided to create my own Java's Robot class in android to take screen capture..i have written the source code of the robot class by my own but the problem is here, the following line in the code is throwing compilation error..saying "The method createRobot(Robot, GraphicsDevice) in the type ComponentFactory is not applicable for the arguments (Robot, GraphicsDevice)"
peer = ((ComponentFactory)toolkit).createRobot(this, screen);
Can anyone suggest me what would be the solution....
thanks..
I've written the following if-statement in Java:
if(methodName.equals("set" + this.name) ||
isBoolean() ? methodName.equals("is" + this.name) :
methodName.equals("get" + this.name)) {
...
}
Is this a good practice to write such expressions in if, to separate state from condition? And can this expression be simplified?
I have a mixed Java / C# project and use an ant script that contains a csc task to compile the dll. This works, but I get a warning
[csc] This task is deprecated and will be removed in a future version
[csc] of Ant. It is now part of the .NET Antlib:
[csc] http://ant.apache.org/antlibs/dotnet/index.html
How can I replace the csc task? I can surely create an exec task calling nant with a project.build file, but that feels completely wrong.
Hi
I want to retrieve a set of records from a database, do a rs.next() and then assign the result of this to a variable to pass to a method that will use this record, in the same way that I would without assigning it to a variable and passing it to a method
is there any way to do this?
I'm using JAVA (1.5)
Hi,
is there a way to log the JdbcTemplate's DataSource connection URL in Java?
The field exists in the DataSource, but there ain't a getter to access it. Of course I could read the DataSource properties from the application context xml, but I'd like to do it the other way.
We have a very strange problem in out application, all of a sudden we started noticing upside down question marks being saved along with other text typed in to the fields on the screen. These upside down question marks were not originally entered by the users and it is unclear where they come from. We are using Oracle 10g with java.
And this is happening, even when no data is copied from Microsoft Word
I know I can find out if a variable is null in Java using these techniques:
if (var==null) - too much work
try { ... } catch (NullPointerException e) { ...} - it tells me what line is throwing the exception
using the debugger - by hand, too slow
Consider this line of code:
if (this.superSL.items.get(name).getSource().compareTo(VIsualShoppingList.Source_EXTRA)==0) {
I would like to know if there's a generic way to find out programatically what variable (not just the line) is throwing the NullPointerException in a certain area of code. In the example, knowing that
What is the default maximum heap size for Sun's JVM from J2SE 6 (i.e. equivalent to setting -Xmx)?
Looks like for J2SE 5 with a server-class machine, it's
Smaller of 1/4th of the physical memory or 1GB.
Bonus question: Looks like for IBM's JVM you can ask it
java -verbose:sizes -version
Can you similarly ask Sun's JVM?
I heard that using shorts on 32bit system is just more inefficient than using ints. Is this the same for ints on a 64bit system?
Python recently(?) basically merged ints with long and has basically a single datatype long, right? If you are sure that your app. will only run on 64bit then, is it even conceivable (potentially a good idea) to use long for everything in Java?
I have a quadcore processor and I would really like to take advantage of all those cores when I'm running quick simulations. The problem is I'm only familiar with the small Linux cluster we have in the lab and I'm using Vista at home.
What sort of things do I want to look into for multicore programming with C or Java? What is the lingo that I want to google?
Thanks for the help.
I'm working on a new Java project and therefore im reading the already existing code. On a very important part of the code if found the following regex expression and i can't really tell what they are doing. Anybody can explain in plain english what they do??
1)
[^,]*|.+(,).+
2)
(\()?\d+(?(1)\))
Hello Guys
i just want to create a simple application that will allow a user to input a url to a rss feed and display the contents to a user.
what would be a good java library to enable me to read rss feeds?
cheers