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Index ‹ java-programmer
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- 1
- Log4J problemHi everyone,
Consider the following piece of code:
Logger mylogger = Logger.getLogger(Log4JFileDeletionTest.class);
public Log4JFileDeletionTest() throws Exception
{
FileAppender fapp = new FileAppender(new
XMLLayout(),"/tmp/Log4JFileDeletionTest.log",true);
mylogger.setLevel(Level.DEBUG);
mylogger.addAppender(fapp);
mylogger.info("This is a test log");
Thread.sleep(7000);
mylogger.info("This is after deleting the file");
}
If during the Sleep(), I delete the log file, then none of the
subsequent log statements re-create the file. It remains deleted, no
exceptions get thrown and all the logs are lost.
Is there any solution to this, other than modifying the log4J code ?
Thanks in advance.
- 3
- Porting C++ Template to Java GenericI've run into a road block with porting some C++ code that makes use
of templates to Java. In it, there is a main class I'll call A that
is a template class:
// C++
template <class T> class A
public:
virtual T Evaluate() const = 0;
};
Other classes extend this class:
// C++
template <class T> class B : public A<T> {
public:
B(const T &v) { value = v; }
T Evaluate() const { return value; }
private:
T value;
};
Now all of this is easy to implement in Java using Generic
programing. The issue I'm having is when I try to implement code like
this:
template <class T1, class T2> class C : public A<T2> {
public:
C(A<T1> a, A<T2> b) { t1 = a; t2 = b; }
T2 Evaluate() {
return t1->Evaluate() * t2->Evaluate();
}
private:
A<T1> t1;
A<T2> t2;
};
Java complains about about the * operator being undefined for
arguments T1, T2; Since Java doesn't have operator overloading, I
can't really see how to implement the same functionality. Has anyone
ever encountered this type of problem, or can anyone see a way around
this issue?
- 3
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- 3
- edit jtable with enteri am having a problem with jtable which i was unable to solve for a
last couple a days. i think there needs to be much more docs on some
tricky uses of jtable than basic JTable/TableModel usage. so far i
managed to move to the next cell when i press enter (right hand side,
instead of moving down).
i'd like to start editing in the next cell after moving from previous
cell. so, if i was in editing mode in some cell, enter should bring me
to the next cell with caret blinking in it. of course, if i wasn't
editing some cell i don't want to edit next cell.
basicly, i want to make "row edit session", for example user starts
editing a cell with f2, and as long as he press enter he edits next
cell, until he reaches the end of the row and then changes are
commited to database, just like M$Access and SQLserver does. i think i
can do this myself, all i need is little help to start edit next cell
if user moves from previous cell. i checked BasicTableUI source, and
as i see i should get the editor component and request focus on it.
but i am stuck with that.
thanks!
- 8
- Announce: A new open source O/R mapping toolAnnounce:
Molly DBO: A new open-source O/R mapping tool is out.
There are many such programs out there. But this one is very
special because it's simple (no xml configuration, yay !) and has
been tested with postgres and mysql. This tool has been used
extensively in production enviroments so the generated code has
most bugs squeezed out by now.
You can check it out at:
http://www.mollypages.org/dbo/
- 9
- processMouseEvent()
MouseDown() and MouseUp() are deprecated; both have been replaced by
processMouseEvent()... how can this be? (two diff. methods replaced by
same method..)
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Component.html#mouseDown(java.awt.Event,%20int,%20int)
thank you..
Frances
- 12
- 12
- web page and image processingHello,
I need to do the following. Given an URL I need to produce a thumbnail
of the webpage. If you did something similar in the past, can you
please give me some pointers?
Thank you,
Nadina
- 12
- new version of Open Content Software Design web bookI have an updated version of my Software Design web
book (free!) that is primarily Java centric. This
web book is not as complete as my "Java AI" and "Introduction
to Common LISP" web books, but it is hopefully in a usable
state as-is. I am especially looking for feedback
on how to improve it (the Common LISP community was
awesome in providing great feedback for the free LISP
book - can the Java community do the same :-)
Help yourself (on the 'Free Web Books" page):
http://www.markwatson.com
-Mark
- 12
- jsp - fetching fresh inserted data - reload issue?hi ng,
i have a form, where a user can input some data.
after pressing submit, the controller.jsp makes some
validations and shall list up this new entry.
in short, my problem is, that this newest entry is
not shown - but is correctly inserted into the db.
+ form.jsp : holds the form
+ controller.jsp : inserts form data into db,
and queries the db to show the newest entry.
after refreshing the site by hand, the newest entry
is listed, BUT also in the db (duplicate in db!).
i tried some java script solutions, top.mainFrame.location.reload()
and adding some META-TAG in the HEAD-Tag of HTML, but no
effects...
feedback is appreciated, thanks in advance.
with regards,
jonas
- 12
- policy file in eclipse.Hello.
How can I declare in Eclipse the policy file (like policy.all : I don't know
if that's matter, but I have version 3.3) ?
Thanks :)
- 14
- 14
- Beginner, this will be a quick fix, so please check it out!!Hi, extreme noob here (less than one week of Java exerience, or any
programming exp)
This program i am writing from a book is suppose to ask the question
"How many gumballs? How mand kids? " , and then allow the user to
input the 2 answers. for example : 80 4
but it doesn't ask that question, it just answers without asking! any
help... ? this is from the Beginner Programming with Java for Dummies
- 2nd Edition. I typed it straight out of the book, and checked it
vary carefully. the output im currently gettins is... "Each kid gets 6
gumballs"
import java.util.Scanner;
class KeepingMoreKidsQuiet {
public static void main(String args[]) {
Scanner myScanner = new Scanner(System.in);
int gumballs;
int kids;
int gumballsPerKid;
System.out.print("How many gumballs? How many kids? ");
gumballs = myScanner.nextInt();
kids = myScanner.nextInt();
gumballsPerKid = gumballs / kids;
System.out.print("Each kid gets ");
System.out.print(gumballsPerKid);
System.out.println(" gumballs.");
}
}
- 15
- A question about Java ThreadI see a code like this:
in a Thread:
--------------------------
public void run() {
Thread currentThread = Thread.currentThread();
while (thread == currentThread) {
try {
repaint();
thread.sleep(100);
}
catch (InterruptedException ex) {
}
}
}
---------------------------
what's the "while (thread == currentThread) " codes mean?
what is it used for?
Thank you in advance.
- 16
- Reading from URLConnection stops at JavaScript alert callHi all,
when I post form content to a server (HTTPS protocol) using a
URLConnection and then reading the servers response using a
BufferedReader, the reader seems to stop just before reading the code
for a JavaScript alert. The code for reading the response looks like
this:
in = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
stbResult = new StringBuffer(5000);
while ((sResult = in.readLine()) != null) {
stbResult.append(sResult);
}
When accessing the same site with a browser a dialog pops up at the
crucial point. After clicking away the alert the rest of the HTML page
gets loaded by the browser.
When looking at the code of the HTML page later on, I can see that the
response read by my java app ended just before the JavaScript code:
<SCRIPT LANGUAGE="JavaScript">alert("xyz");</SCRIPT>
I need to read in the whole page including the alert message. How can
I get my java app to read in the JavaScript code within the HTML page
(no problem occured with the JavaScript code in the header) and the
remaining HTML code?
Thanks for thinking about this one!
Ralf
|
| Author |
Message |
tmorrissey
|
 Posted: 2003-10-24 0:11:00 |
Top |
java-programmer, Struts & JSTL <c:out>
Greetings:
Relative newcomer to Struts and JSTL. My question is about using
<c:out>, pageContext, and request.
My experience has been doing to following in an appropriate action
class. Setting an object as an attribute of the request in the execute
method of the Action Class:
request.setAttribute("object1", Obj1);
Then in the corresponding JSP, pulling the object off the request and
casting it for use:
<% Obj1 local_Obj1 = (Obj1)request.getAttribute("object1");
Then being able to use dot notation to access methods of Obj1.
My question is that with JSTL <c:out> the object needs to be on the
pageContext. Do I need to explicitly set this? If so where? How does
this tag work in this situation?
Any help on the matter is greatly appreciated.
Thank you,
Tim Morrissey
|
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VisionSet
|
| Posted: 2003-10-24 0:23:00 |
Top |
java-programmer >> Struts & JSTL <c:out>
"TPM" <email***@***.com> wrote in message
news:email***@***.com...
> My question is that with JSTL <c:out> the object needs to be on the
> pageContext. Do I need to explicitly set this? If so where? How does
> this tag work in this situation?
>
No it can be any context, page, request, session or application
They can be refered to explicitly or if not they are all searched.
See the jstl spec
--
Mike W
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Index ‹ java-programmer |
- Next
- 1
- doing something after so many times something has loadedHi am currently writing a java application. The program that i am
writing allows people to be able log on to the program using a username
and password. I want to be able to edit information in a MySQL Database
when there has been a password error 3 times. How would i go about
checking to see how many times something has happened.
Any help would be apreciated.
Thank you
- 2
- SSL HostnameVerifierWas getting "hostname wrong" when connecting via HttpsURLConnection.
Setup my own HostnameVerifier, returned true, and problem went away.
However, exactly what problem did I solve, and did I introduce a
security risk? When the substitute HostnameVerifier was called, first
argument "String urlHostName" was identical to second argument
"SSLSession session.getPeerHost()", i.e., the IP address of the server
from whom the certificate was obtained. What mismatch triggered the
call to the substitute HostnameVerifier?
Thanks.
- 3
- Creating us map graphics?Hello,
Does anyone know of any Java freeware that can help me generate a
US map with states being different colors? I am running JDK 1.3 for
Solaris. My intention is to color code states based on the number of
users wwe have from each state.
Thanks, - Dave
- 4
- How to Call two servletsHi Everyone,
My most of programming experience is in Microsoft tools. mainly ASP. And in
ASP we can "Include" one ASP file in an another ASP file. Can we do some
thing similar with Servlets also..
Say i want to Display two Lines on my Web page.
This is First Test Line from Servlet one
This is Second Test Line from Servlet Two.
Where the line as it says come from servlet one and line two will come from
servelt 2.. Or say i have a Main Servlet and now i want to call these 2
servlets in there from my Main Servlet.
Please help me there
Thanks
RSB
- 5
- inner classes and static membersCan somebody please tell me a practical reason why you couldn't have
static members (not constants) within an inner class? I know that this
is forbidden, but I haven't found a practical, concrete reason for
this... I was wondering if this was just a whimsical decision from the
designers of the language.
Thanks a lot in advance...
- 6
- ++i is faster than i++ in Java?I want to know in Java, is prefix operator faster than postfix
operator?
for example, ++i is faster than i++. I know in C++, this is the case,
but not sure if Java is the same.
please advise. thanks!!
- 7
- Unc path on IntellijHi
Is there a I can add unc path when ading Jar/Directory to Module
Libraries on Intellij ?
- 8
- access web service over pluginHi All,
I'm trying to access a web service over a simple plugin. The web
service is
the "helloservice" example of jwsdp 1.3 .
When I compile and run the example as java-project in eclipse, it
works!
But when I try to make a plugin, I get the error:
Endpoint address = http://localhost:8080/hello-jaxrpc/hello
hello obj: staticstub.HelloIF_Stub@5e8d7d
java.lang.NullPointerException
at com.sun.xml.rpc.soap.message.SOAPMessageContext.createMessage(SOAPMessageContext.java:114)
at com.sun.xml.rpc.client.StreamingSenderState.<init>(StreamingSenderState.java:26)
at com.sun.xml.rpc.client.StreamingSender._start(StreamingSender.java:46)
at staticstub.HelloIF_Stub.sayHello(HelloIF_Stub.java:52)
at staticstub.HelloClient.main(HelloClient.java:46)
at hallo.actions.SampleAction.run(SampleAction.java:37)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:207)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:456)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent(ActionContributionItem.java:403)
at org.eclipse.jface.action.ActionContributionItem.access$0(ActionContributionItem.java:397)
at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java:72)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:81)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:840)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2022)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1729)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1402)
at org.eclipse.ui.internal.Workbench.run(Workbench.java:1385)
at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:858)
at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.eclipse.core.launcher.Main.basicRun(Main.java:291)
at org.eclipse.core.launcher.Main.run(Main.java:747)
at org.eclipse.core.launcher.Main.main(Main.java:583)
Can someone help me??
Thanks!
- 9
- encoding troublesHi all!
I have a byte array of data which I want to post to an php script. So I send
the representing string of the byte array using a post with utf-8 encoding.
I figured java works with UTF-16BE internally, but after receiving the utf-8
encoded post in php and converting it to back to UTF-16BE it was not the
same...
I wrote a little test and it turns out if i conver a byte array to utf-8 and
back it wont match the original byte array, but the string representing it
is the same:
String test="some test";
byte[] dest,temp;
dest = test.getBytes();
try {
temp=new String(dest).getBytes("UTF-8");
}catch(Exception e) { System.out.println(e); }
try {
test=new String(temp,"UTF-8");
System.out.println(test);
dest=test.getBytes();
} catch(Exception e) { System.out.println(e); }
if(dest==temp) System.out.println("Success!");
else System.out.println("failed");
How can I convert the UTF-8 bytes back to the original byte array? And will
this work when posting to php? Its important the binary data remains intact
instead of the string representation...
Thanks in advance,
Matthijs
- 10
- Read data with delimater using stringtokenizerHei,
I have problem with this
if i have test with
aa,bb,cc,dd
aa,,cc,dd
and use
StringTokenizer str=new StringTokenizer(str,",",false)
after i read the data will be as
aa
bb
cc
dd
aa
cc
dd
the blank data in row 2 is missing. any suggestion or any suggestion on
method using beside stringtokenizer?
Cheers,
- 11
- How Robots Will Steal Your JobHumour. Lost on you?
CyberLegend aka Jure Sah <email***@***.com> wrote in message
news:email***@***.com...
> Airy R Bean wrote:
> > Are owls more intelligent than chickens?
> > Have you ever seen a shop selling Kentucky Fried Owl?
> As a mater of fact I have never seen a shop selling Kentucky Fried
> Chicken. I don't live in the USA.
> It would be curious to know what your point was tho.
- 12
- Sun's WTK2.5 is asking for permission to contact network every timeI've just started using the final release of Sun's wireless toolkit
(WTK) 2.5. It's asking for permission to contact the network each and
every time network access happens - I'd like to switch it to asking only
once times (or never, if possible), but can't find the option in the
docs or via the tools in WTK2.5/bin. Can anyone shed any light on this?
thanks,
lex
- 13
- Strange problem!!(it is, atleast to me!!)Although, this is not a programming or development problem instead its
an end user problem which im facing and thought programmers /
developers could help.
I have Win XP SP2, JRE 1.5 installed with IE. Now for certain sites my
applets dont refresh after i click them (well ofcourse i click where a
click is expected :) this happens when i connect using my cable
broadband connection.
(I am connected to a local provider via LAN who provides me connection
to the primary ISP). On the other hand evrything works as expected
when i use dial up connection(using the phone line). Ive tried with
many browsers and it doesn work. Ive tried everything i could. And the
same site works well at my frnds place who has the same broadband ISP
but hes on a different LAN and rest all settings are the same.
The error i see on the console- " java.lang.NullpointerException Could
not send message".
I know the error wouldn be of much use but hope the explanation of the
problem may have some solutions.
Kindly help me.
- 14
- Loading a properties file using ResourceBundleI try to load a properties file using ResourceBundle. However, when I print
out the data in the map table, they are not in order as in the properties
file.
Is there a way lo load the properties file using the ResourceBundle so that
the data in the map table are listed in order as in the actual properties
file.
Example:
The properties file contains
ID1
ID2
ID3
After loaded and when printed out from tha map table, it displayed as
ID2
ID1
ID3
Thanks
--
Message posted via http://www.javakb.com
- 15
- How to set ProcessingInstruction in jdom Document?Hi all,
i try to make xml file with jdom, and also i made xsl file for presenting
xml in browser.
because of that i need to add processing instuction in xml file
...
<?xml-stylesheet type="text/xml" href="test.xsl" ?>
<root>
...
</root>
i did :
Element root = new Element("root");
Document document = new Document(root);
ProcessingInstruction pi = new ProcessingInstruction("xml-stylesheet",
"type='text/xsl' href='test.xsl'");
document.addContent(pi);
...
i got xml file like this
<?xml version=1.0 ?>
<root>
...
</root>
<?xml-stylesheet type="text/xsl" href="test.xsl" ?>
how to put this line
<?xml-stylesheet type="text/xsl" href="test.xsl" ?>
in front of <root>
thanks
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