Recently I ran into this error in my web application:
java.lang.OutOfMemoryError: PermGen space
It's a typical Hibernate/JPA + IceFaces/JSF application running on Tomcat 6 and JDK 1.6.
Apparently this can occur after redeploying an application a few times.
Does anyone know of a way, in Java, to convert an earth surface position from lat, lon to UTM (say in WGS84)? I'm currently looking at Geotools but unfortunately the solution is not obvious.
I am trying to use groovy to do shell scripting on unix, but I am not having any luck having one process retain the environment variables changed by another process. For example,
def p1 = ["bash", "-c", "source /some/setEnv.sh"].execute()
Now, I would like a second process, p2, to inherit the environment variables that was set in p1. How can I do this? I don't see anything in java.lang.Process or its groovy extension that would spit out the environment variables after the process has executed.
I recently moved from NetBeans to Eclipse and I very much miss one great feature - whenever I use method which throws some kind of exception, NetBeans alerted me and I needed to add try-catch and NetBeans automatically generated exception type for me. Is there something similiar for Eclipse?
f.e. : Integer.parseInt(new String("foo"));
NetBeans alerts I need to catch NumberFormatException.
Eclipse doesn't alert me at all
I am using Eclipse Java EE IDE for Web Developers, 3.5 - Galileo
Hi,
Is there a way I can do a for loop for a certain amount of time easily? (without measuring the time ourselves using System.currentTimeMillis() ?)
I.e. I want to do something like this in Java:
int x = 0;
for( 2 minutes ) {
System.out.println(x++);
}
Thanks
Hi, im connecting to dBase from java with this string:
String url="jdbc:odbc:DRIVER={Microsoft dBase Driver (*.dbf)};DBQ="+databasePath+";DefaultDir="+databasePath+";DriverId=533;FIL=dBase IV;MaxBufferSize=2048;PageTimeout=5;";
Work fine, but with a SELECT statement i can retrieve only record that are not "deleted".
In dBase database deletet record are only flagged deleted, so i want retrive deleted record too. Is this possibile?
Thank.
I have to develop a specialised report editor in Java. The user will get a number of fields that can be layed out on a page plus some graphical elements. The resulting report design needs to be serialized into already defined database tables.
Is there any software library that will help to achieve this without reinventing the wheel? I have come across Eclipse GEF and Zest, but I am not sure if this really meets my problem.
What are the Java language and standard library design flaws you are aware of? I ask only for flaws that:
cannot be changed or are unlikely to change due to backward compatibility,
are NOT controversial, i.e. most of programmers would agree that "this is a bug not a feature" (for example checked exceptions seem to be controversial language feature, so I wouldn't classify them as "design flaw").
I am porting some functionality from a C++ application to java. This involves reading non-modifiable data files that contain regular expressions.
A lot of the data files contain regular expressions that look similar to the following:
(?<=id="VIEWSTATE".*?value=").*?(?=")
These regular expressions produce the following error:
"Look-behind group does not have an obvious maximum length near index XX"
In C++ the engine being used supported these expressions. Is there another form of regexp that can produce the same result that can be generated using expressions like my example as input?
I'd like to have some kind of file browser like Windows Explorer inside a Java Application.
I just want something that's able to list file inside a folder recursively.
Is there a simple way to do this ?
I already tried to use JFileChooser but it's not what I want.
In Java, what's generally the most accepted way to organize a class in terms of the order in which declared data members and methods should be listed in the class file, keeping in mind the following and anything else you can think of for each one:
its visibility
whether it's a constructor, method, or member
if it's a method, does it overload, or override other method(s)?
Regexp in Java
I want to make a regexp who do this
verify if a word is like [0-9A-Za-z][._-'][0-9A-Za-z]
example for valid words
A21a_c32
daA.da2
das'2
dsada
ASDA
12SA89
non valid words
dsa#da2
34$
Thanks
i am wondering regarding Java: is there a file extension separator?
like *.doc, the "." being the question.
i know there is a line.separator. just would like my app to be portable so i need to know.
thank you.
We are using "Bottom Up" approach for building webservices.
We have 10 java classes which we want to expose as a webservice.
How can we create only one WSDL file for these classes?
(java2wsdl utility & its ANT TASK takes only one class as parameter for generating WSDL file.)
Does anyone know of any tool that can facilitate/ease porting of an app to both Java Swing and GWT?
I've got a few "screens" that makes complete sense to have both in a desktop app and in a browser and I was wondering if there was some kind of common API that could be targetted that would facilitate creating these two different "views" (see my comment)?
What value is hashCode() method is returning in java?. i read that it is an memory reference of an object. when i print hascode value for new Integer(1), its 1. for String(a) - 97. so i confused. is it ascii or what type of value is?
I am planning to write a Java applet for Tower of Hanoi similar to link(
http://www.mazeworks.com/hanoi/index.htm )
Can you suggest how should I start and proceed.
And, btw, does it require multi threading?
And also, major part of my doubt is
to make a disc being clickable and being able to drag and drop the disc on a tower.
detect a tower (if a disc is being dragged using mouse)
Can anyone suggest a FileSet package/class in Java. By FileSet I mean a collection of files and directories together with regex-powered inclusion and exclusion rules (similar to Apache Ant). Thanks.
Hi all, I would like to know simple k-means algorithm in java. I want to use k-means only for grouping one dimensional array not multi.
For example,
before grouping the array consists of 2,4,7,5,12,34,18,25
if we want four group then we got
group 1: 2,4,5
group 2: 7,12
group 3: 18,25
group 4: 34
I want to create a TreeMap in Java with a custom sort order. The sorted keys which are string need to be sorted according to the second character. The values are also string.
Sample Hash:
Za,FOO
Ab,Bar
Hi,
Please point me some real time examples scenarios for each java collection classes.
For example to store file system in a hard disk ,our best option is TreeMap.I need example for other classes.
Thx
I am running Xcode 3.2.2 with the iPhone SDK and was wondering if there was any way to (re)enable Java templates from the earlier versions of Xcode.
Thanks in advance!
Anyone know a decent Java libarary for HTML elements?
Ex if I want to create an img-element, I would go new Image(...)
The object should support the normal HTML functions/attributes, such as setting CSS or disable.