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- 4
- How to convert Java class to exe files for performance?I have developped a java application (no awt involved) for my school research.
It's basically a scientific calculation program, which has huge loops.
Now it's very slow to run it in java/JIT.
I'd like to know if there are some existing free program to translate java
code(or class) to C code(or exe) since rewrite my code in C will take too long.
Has anyone used samilar converter before? Any suggestion is appreciated.
Thanks,
Wei
- 4
- hot java"hot java" sounds so...pornographic? larcenous?
anyhow, suns "hot java browser" is end-of-life, or whatever. I've poked
around a bit and found jazilla, some sort of "ice" java..
anyone use these, or other browsers written in java?
- 4
- put application on server ??!!!!I have developed a java application that can return shortest path by
inputting data.
I would like to integrate this application into web application by putting
into tomcat server so that client can use the application through the
internet.
I am new to web service programming and I just start to learn jsp. I would
like to ask how I can do such implementation?
make my application into a bean ? and use the bean?
Please give me advice and help or references ..
Thousands thanx
- 6
- java 6 used in large companies?hi..
we are a large company considering the move from java 1.4 to either 5
or 6.
at the same we are upgrading to was6 (or maybe jboss 4), we are
interested to learn if there are any major projects on enterprise
level involving java 6 (including the use of it's web services
framework).
- 6
- A basic tomcat questionHi gang, Tomcat's not my area of expertise but I have to get some simple
things set up -- nothing fancy.
I'm having trouble getting classes & packages to work. The setup is Tomcat
5.5.4 & JDK1.5. I can get basic servlets and JSPs to work, but I'm having
trouble with user classes and packages. Here's an example:
tomcat\webapps\ROOT\Test\TestMovie.jsp
----------------------------------------
<#@ page import="testpackage" @>
<html>
<body>
<% Movie m = new Movie("Gone With the Wind", 1936, 19.95); %>
<%= m.title %>
</body>
</html>
tomcat\webapps\ROOT\Test\WEB-INF\classes\testpackage\Movie.java
-------------------------------------------------------------------------
package testpackage;
public class Movie
{
public String title;
public int year;
public double price;
public Movie(String title, int year, double price)
{
this.title = title;
this.year = year;
this.price = price;
}
}
I've googled this & read the documentation, everything seems to say put all
the classes in packages, create a folder for the package under
WEB-INF\classes, and put the class files in the package folder, and that
should do the trick. But I must have something else missing. Any ideas?
Also, I don't know if this is related, but is there a trick to using new
featured of Java 1.5 in a JSP? I can't get the following JSP to compile:
<%@ page import="java.util.*" %>
<html>
<head>
<title>You're breaking my concentration.</title>
</head>
<body>
<% ArrayList<String> s = new ArrayList<String>();
%>
</body>
</html>
It complains about the first < in the scriptlet. Does that have to be
escaped somehow?
TIA,
--D
- 6
- Response cache on the application serverIs it a good thing to cache the search result?
The metadata for our system can be as much as 100,000
I am trying to enable the response cache on the web server.
However, I am thinking about the problem i might meet.
When you cache the search result, is it possible the other
person throw the same condiiton and see the same result?
With our system there some security set for each row, so
if this happens there is a security leak.
MD
- 6
- Parsing a test fileI'm pretty new to Java and have been assigned to parse a log file.
The file is tab delimited. I have several tokens that I need to look
for. I have to find all the rows that have "290" then check a column
within that row. That value must match a pattern. The pattern will be
stored in a db table, so the user can add muliple patterns. That item
will then be placed in a new file.
A good example would be awesome.
Thanks.
- 8
- URL in IFRAMELet's say I have a struts action at http://xyz.com/someAction.do and this
URL is referred from one IFRAME via "src" attribute of IFRAME. Is it
possible for me to detect inside someAction.do which page is embedding it in
an IFRAME? How can I do this?
et me put question in a different way, if I refer to Google API with this -
code:
------------------------------------------------------------------------------
<script
src="http://maps.google.com/maps?file=api&v=2.x&key=ABQIAAAAHuQre3TX-ZKoHs97iqelnBQn09xNixTqt4LnUZ12n-xJURxIHRRdLvNa4xtUwCJO0gkyTjCSRjfctQ"
type="text/javascript">
------------------------------------------------------------------------------
How does it know that the request is coming from domain xyz.com? It is not
purely based on the key - if I send same key from another domain, it doesn't
work! So how can I do that? Which header do I use? The referer header is
returned as null!
- manish
- 8
- Java Chat Recording.Hi,
A website I use has a chat room and it's chatter-side interface is a Java
application. The comments chatters post come thick and fast and, although
there is a scoll bar, it's no good scrolling down to see comments missed,
as, as soon as a new comment is posted, all the comments scroll up to it.
There is no cut-and-paste/recording facility. As it's possible to scroll
up and down the comments, there must be somewhere where the comments are
held. Would this be just in some sort of video buffer, a
constantly-appended file on my PC's disk drive or just in memory? Is there
any way to record the conversations? Have the output from the Java
application redirected to a file, etc?
Thanks in advance.
Yours,
Gary Hayward.
- 8
- Error passing Element to web serviceI'm upgrading from WebLogic 6.1 to WebLogic 8.1 SP 4.
We used to specify weblogic.soap.http.SoapInitialContextFactory and
weblogic.soap.encoding.factory to lookup the web service in the client.
Well, the SoapInitialContextFactory and CodecFactory classes are no
longer around. So now I've used clientgen to generate the stubs and
here is my client code:
MyWebService service = new MyWebService_Impl(wsdlurl);
MyWebServicePort port = service.getMyWebServicePort();
Element result = port.processIt(theElement);
However, I get the following error calling processIt:
java.rmi.RemoteException: web service invoke failed:
javax.xml.soap.SOAPException: failed to serialize interface
org.w3c.dom.Element weblogic.xml.schema.binding.SerializationException:
Failed to serialize Document due to the following error
weblogic.xml.stream.XMLStreamException: The local name of an attribute
cannot be null
...
Caused by: weblogic.xml.schema.binding.SerializationException: Failed
to serialize Document due to the following error
weblogic.xml.stream.XMLStreamException: The local name of an attribute
cannot be null
at
weblogic.xml.schema.binding.internal.builtin.DocumentCodec.serialize(DocumentCodec.java:76)
...
Here's the schema and xml file:
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://myproject.org/myproject_test.xsd"
xmlns:myproject_test="http://myproject.org/myproject_test.xsd"
elementFormDefault="qualified">
<element name="TEST">
<complexType>
<sequence>
<element ref="TEST_ID"/>
</sequence>
</complexType>
</element>
</complexType>
<element name="TEST_ID" type="string"/>
</schema>
<?xml version="1.0" encoding="UTF-8"?>
<TEST xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://myproject_test.xsd"
xsi:schemaLocation="http://myproject.org/myproject_test.xsd"
file:///N:/myproject/metadata/myproject_test.xsd">
<TEST_ID>ABCD1234</TEST_ID>
</TEST>
I've been testing with this bare minimum schema so that I can change
the namespaces and other things easily. The one and only thing that's
made a difference is when I take out the namespace stuff from the xml
file, it does get sent to the server. I.E.:
<?xml version="1.0" encoding="UTF-8"?>
<TEST>
<TEST_ID>ABCD1234</TEST_ID>
</TEST>
However, I can't leave it like that because the server doesn't know
what to do with it. Also, when the server tries to send the response,
it gets the same error as above.
weblogic.xml.stream.XMLStreamException: The local name of an attribute
cannot be null
at
weblogic.xml.babel.adapters.DOMAdapter.adaptAttribute(DOMAdapter.java:113)
at
weblogic.xml.babel.adapters.DOMAdapter.adaptElement(DOMAdapter.java:147)
...
javax.xml.soap.SOAPException: failed to serialize interface
org.w3c.dom.Element weblogic.xml.schema.binding.SerializationException:
Failed to serialize Document due to the following error
weblogic.xml.stream.XMLStreamException: The local name of an attribute
cannot be null
The web service also returns an Element, but it's a different type from
a different schema, which I haven't touched. So the server is having
the same problem as the client.
If I change the web service to receive and return only strings, it
works fine. But I haven't been able to figure out why it won't work
for the Element. Does this sound like a problem with my WebLogic
configuration, the schemas/xml files, the web service, the client? Is
there a way to tell what attribute it is complaining about?
Thanks,
Christy
- 13
- Forcing swing gui to be drawnHey, right now I have a program that analyzes an EKG when a button is
clicked. I want to pop up a progress bar in a new frame to show how far
it is, but I'm having problems. I can create the frame, and it will
appear, but it won't draw the progress bar until it is done executing
all of the other commands.
I ahve tried opening the frame with a separate thread, but it resulted
in the same problem. I guess there must be some draw queue that is on a
low priority, but I really have no idea why it isn't working.
Any help would be great... I show this at a science fair in 2 days.
Thanks!
-Thomas
- 13
- Bound Threads (Re: Process vs Thread: what are the consequences?)On Tue, 13 Nov 2007 16:04:12 +0000, Kenneth P. Turvey wrote:
> Just based on some experimentation I was doing, this doesn't seem to be
> true. I'm running Linux with the Sun JVM, and it didn't map each Java
> thread to a native thread until the Java thread was spending enough time
> executing. I was actually trying to get this mapping (1 to 1) and found
> it impossible to guarantee under Linux with the Sun JVM.
>
> Under Solaris there is the -XX:UseBoundThreads (or something similar) to
> get that behavior, but under Linux no such option exists.
>
> I will freely admit that my experiment could have been flawed, but it
> wasn't behaving as if it was using more than a single native thread. I
> suspect that the article above is out of date.
I hate to followup my own post, but I've been looking at this problem
again and I'm really just unhappy with how it works. Since this can so
easily be solved under Solaris, and Lew (I think?) mentioned that this is
all JVM dependent. I was hoping somebody could point me to a JVM that
runs under Linux that supports the -XX:UseBoundThreads option or something
similar. I want a 1:1 mapping between native threads and Java threads and
I just can't seem to get it.
Does anyone have any idea? (BTW, I checked IBM's JVM).
--
Kenneth P. Turvey <email***@***.com>
- 16
- How to render a JCheckBox on cells of JList?I do it like this:
public class CheckBoxCellRenderer extends JCheckBox implements
ListCellRenderer {
public CheckBoxCellRenderer() {
super();
}
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
if(isSelected)
{
this.setForeground(java.awt.Color.BLUE);
}
this.setEnabled(isSelected);
this.setText("Hello");
return this;
}
However, there is a problem: I can not select or disselect those check box
rendered in the JList.
What wrong?
Thanks.
MaoXuePeng.
- 16
- Hibernate305: delete query fails with "must begin with SELECT or FROM"I'm using Hibernate 3.0.5, JDK 1.4.2, and Oracle 9i.
I'm following the Hibernate 3.0.5 docs to build a query to delete rows
from a table. My code looks something like this:
-----------------
String hql = "delete ReqField " +
"where fieldName = :fieldName and value
= :value";
Query query =
sessionFactory.getCurrentSession().createQuery(hql);
query.setString("fieldName", fieldName);
query.setString("value", value);
int deletedRows = query.executeUpdate();
-----------------
This fails with:
org.hibernate.QueryException: query must begin with SELECT or FROM:
delete [delete ReqField where fieldName = :fieldName and value
= :value]
What is wrong with my query?
- 16
- Java Native Interface - passing parameter array of different datatypesGreets!
Yesterday I googled for hours to find a tutorial how to call Java
methods from C++ native code. Unfortunately I didn't find anything
useful, the Java JNI documentation doesn't capture the functionality
of the JNI very well.
I want to do the following: I want to call a Java method from C++
code. The Java method has some parameters of different datatypes, like
public static boolean dosomething(int x, long y, String z)
for example. Is there any way to do this? The Call...Methods() take
the method ID and an array of parameters to pass to the function, but:
HOW TO CREATE AN ARRAY OF DIFFERENT DATATYPES???
It's only possible to create a new array calling something like
NewObjectArray() when passing a datatype given.... I think, the only
way to pass parameters of different datatypes from C++ to Java methods
is to create a new class containing all parameters necessary and to
pass the class as the one and only argument.
Any ideas?
Best Regards
Clemens
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
|
| Author |
Message |
druphel
|
 Posted: 2004-11-10 15:49:00 |
Top |
java-programmer, Focusable JPanel how?
Hi,
How to make JPanel gain focus and make responsible on key events?
|
| |
|
| |
|
tor.iver.wilhelmsen
|
| Posted: 2004-11-11 2:46:00 |
Top |
java-programmer >> Focusable JPanel how?
"druphel" <email***@***.com> writes:
> How to make JPanel gain focus and make responsible on key events?
Try requestFocus() - remember to call it after the component is
visible.
|
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Index ‹ java-programmer |
- Next
- 1
- Simple While Loop problemJohn wrote:
> ththx.
>
> the code is wrong. months will be determined by the loan amount not just an
> arbitary number
>
>
> cheers
>
>
Can you not top-post please, John? It makes threads very hard to follow...
alex
- 2
- What is a type error?Marshall <email***@***.com> wrote:
> David Hopwood wrote:
> > Marshall wrote:
> > > Mightn't it also be possible to
> > > leave it up to the programmer whether a given contract
> > > was compile-time or runtime?
> >
> > That would be possible, but IMHO a better option would be for an IDE to give
> > an indication (by highlighting, for example), which contracts are dynamically
> > checked and which are static.
> >
> > This property is, after all, not something that the program should depend on.
> > It is determined by how good the static checker currently is, and we want to be
> > able to improve checkers (and perhaps even allow them to regress slightly in
> > order to simplify them) without changing programs.
>
> Hmmm. I have heard that argument before and I'm conflicted.
>
> I can think of more reasons than just runtime safety for which I'd
> want proofs. Termination for example, in highly critical code;
> not something for which a runtime check will suffice. On the
> other hand the points you raise are good ones, and affect
> the usability of the language.
There doesn't seem to be a point of disagreement here. Programmers
often need to require certain properties to be checked at compile-time.
Others could go either way. There is no property that a program would
rationally desire to *require* be checked at runtime; that would only
occur because the compiler doesn't know how to check it at compile time.
--
Chris Smith - Lead Software Developer / Technical Trainer
MindIQ Corporation
- 3
- eclipse, integrating crystal reports plugin with rcp appHello,
I have got a problem, I have to integrate Crystal Reports plugin with
my RCP app. I want Crystal Reports perspective aviable in my
application.
I've downloaded crystal reports plugin, and unpacked it to my_rcp_app
\plugins,
and I've run eclipse with -clear flag. but crystal reports plugin
isn't visible in Plug-In details window.
How can I cope with that problem ?
Is the any tutorial, or sth. about integrating plugins with RCP app ?
thanks a lot for any help
- 4
- jigsaw's jdbmI like that I can use the jigsaw outside if jdbm. For
writing j2me (personal java) that don't have any sort
of record manager on the device I want to also use
jdbm there. However jdbm requires some of the file
classes that are not universally available within
j2me. I don't have the error posting just now (stupid
me) from javac to show what's missing. Has anyone
worked through this or have another idea for an
embedded data (flatfile) manager for j2me?
Mike
- 5
- JMF video frame sizeI need to know dimension of the media file played by
javax.media.bean.playerbean.MediaPlayer
I use the code you can see below:
FormatControl formatControl = (FormatControl)
this.mediaPlayer.getControl ("javax.media.control.FormatControl");
VideoFormat videoFormat = (VideoFormat) formatControl.getFormat();
return videoFormat.getSize();
mediaPlayer is known object from another class.
But I get formatControl == null.
It's very very strange, but just one time this code did work.
So I have no idea ... Someone else?
- 6
- Returning a reference to an objectHi,
I've created a class to implement a state machine, so it's got a State
attribute. It has algo got a private java.util.Stack attribute.
In order to work, State classes need to access the stack to push and pop
data, etc.
To access it from State, I have wrote a method called getStack() which
returns a reference to the stack, but I think this is not recommended
beacause all objects sharing the reference can modify it, and led to errors
difficult to debug, etc. Returning a stack's clone is not valid solution,
as I have to make changes on the real one.
So my question is, is there a cleaner way to do this?
Thank you very much
--
PGR
- 7
- Casting Object[]Hi :o)
I've created a useful routine that "appends" an Object on to the end of an
array of Object, creating a new array with slack space if there is not
enough space available (sort of like a light-weight Vector):
public static final Object[] append(Object[] buf, int buf_len, Object addxn,
int slack)
{
Object[] ptr = buf;
if (buf == null || (buf_len + 1) > buf.length)
{
ptr = new Object[buf_len + 1 + slack];
if (buf != null) System.arraycopy(buf, 0, ptr, 0, buf_len);
}
ptr[buf_len] = addxn;
return ptr;
}
Anyway, this works fine, no probs, etc.
I am having problems, however, casting Object[] onto String[] or any other
such cast. Even if, obviously, all the elements of the array are String.
Now, I can state straight off where the problem lies. If I choose a large
enough String[] buffer so that the appended String fits inside it, then the
returned array can be cast back onto String[] - however, if the buffer is
exceeded, and line 6 is executed (creating a new buffer) then it can no
longer be cast back onto String[].
Does that make sense?
Anyway, the question! Is there any way of creating an Object[] array
generically which is of the same type as the original array. In other words,
it would create a new String[] array or Color[] or Rectangle[] or whatever
as appropriate?
Is there a way of doing it by reflection??? (perhaps)
Cheers :o)
And if you don't understand what I going on about, just shout! (hehe) and
I'll try and explain better!
Will
- 8
- Open source Java on the way! (Re: BEA Weblogic blows away .NET, other J2EE servers in review by PC magazine)"codewriter" <email***@***.com> wrote in message news:<Swd1b.4631$email***@***.com>...
> Java days are numbered. Dot Net is going to take over. This is the reality.
> So, you guys better get some C# books before it is too late.
> Amen.
ROTFLOL!
how many times did i hear this from j++ guys awhiles back, and even
from some ASP and COM jocks in AT&T (where i worked) in 1997(?) or so.
guess what happened? i'm still laughing my way to the bank and they're
trying to figure out c#/vb.net - the old microsoft treadmill,
methinks....
http://www.angrycoder.com/article.aspx?cid=1&y=2003&m=7&d=17
believe me, java will still be here years from now when microsoft has
moved on to the next BIG THING (dragging along all the developer
baggage for the ride - most of whom will be c#/vb.net developers in
india, no doubt).
in the meantime, some interesting news:
it seems sun may not be so stupid after all, and is working very
closely with open source organizations like apache and red hat to
spread java.
after apache announced a few weeks ago that it would be creating its
own open source J2EE app server, red hat announced that it was
planning on an open source java, with sun's blessing.
http://www.freeroller.net/page/kalimantan/20030822#red_hat_and_sun_to
methinks microsoft is in very big trouble.
- 9
- Junit tests, setting up tests without having to create a billion methodsJames McGill wrote:
> On Wed, 2006-02-15 at 19:42 +0000, Andrew McDonagh wrote:
>
>>email***@***.com wrote:
>>
>>>Is there a more dynamic way of setting up tests? We have legacy test
>>>code that we are trying to convert to junit.
>
>
> I really enjoyed using Fitnesse. A whole different idiom for testing,
> but very flexible and accessible to nonprogrammers.
>
> http://fitnesse.org/
>
>
> Anyway, it sounds like you're working backwards. You've already written
> the code you want to test, which is backwards from TDD, which sort of
> means JUnit isn't exactly the right tool for what you're doing. Still
> it occurs to me that you should be able to automatically generated
> wrappers for your legacy tests, and put those into a testsuite, and be
> done with the legacy stuff and move forward with JUnit.
>
>
>
Hi James,
You seem have have attributed the OPs remarks to me...
That being said, the OP is specifically talking about the case where we
have a legacy code base which wasn't tested with Junit - not that it
wasn't tested. There's no mention of whether TDD was used or not -
though I think we both suspect it wasn't and that the code base was
merely Unit Tested.
Unfortunately, working with legacy code is currently the most common
starting point on projects that adopt TDD. Greenfield projects using TDD
are still rare.
Also, keep in mind, whilst JUnit was developed as a tool to Aid TDD,
Beck et al do realise that some people won't or can't do TDD but still
need a decent Unit Testing tool.
As I'm sure you know - but as an aid for others - TDD is not Unit Testing.
TDD is actually a design methodology that happens to use unit tests to
describe the design. Much like RUP uses UML, etc. In fact this usage of
the term Test has causes so many to concentrate on the testing side of
TDD that some are now starting to question whether a better name could
be found.
e.g.
Behavior Driven Development (http://behaviour-driven.org/)
Specification Driven Development
etc.
Andrew
- 10
- [POLL] Dropping support for old SpiderMonkeysHi,
as JavaScript.pm development is moving again I'm considering dropping
support for older SpideyMonkey and focusing on 1.7 and later (the one
used in FF 2.0).
Instead on having to download and install SM manually I was planning
on putting up a source release of the SM 1.7 engine on my server and
add the possibility for Makefile.PL to download and install it.
Alternatively I can bundle the source with JavaScript.pm. You will
still however have the possibility to build against your own SM src.
This way we can better control availability of utf8, threading and
e4x (and future stuff too).
Does this sound like a good idea?
Thanks
/Claes
- 11
- encrypted source file support in jdk?Hi
I an wondering if anybody knows if its possible to extend the
functionality of the sun java compiler/vm in jdk6, with for example
plugins or similar? or if the jdk supports something similar already?
What I am looking for is to set up a jdk environment where the source
code is ecrypted at the file level. This requires javac to be able to
en-/decrypt the source files. For further protection, the jvm would need
such support as well.
some details:
To answer the typical question first. For this scenario I am not
interrested in encrytpted filesystems, because it still leaves the
files vulnerable as long as the filesystem is mounted. The secrecy of
the files can still be compromised from hacking, virus, trojans, skype,
xss and all other sorts of system hacking. With encrypted files the
information in the files are still protected, even in the case a trojan
sends a file by email to somebody on the internet. Enctrypted
filesystems only help protect the integrity of the local system and the
disk while the system/disk is not running. Encrypted files help protect
the information during use as well.
I know there are many other issues as well, I'll be working throuhg it.
here is the list of the issues of most importance:
- en-/decryption support in
- ide / editor
- compiler
- code searching tools
- disassembler/debugger
- remove excess information from class files
- how to handle static content files
- html, css, jsp, configuration files for libraries and frameworks etc
- if class files are also encrypted
- en-/decryption support in the jvm runtime, covers tomcat, jboss etc.
- possible encrypted jar/war/ear files etc
- debugger
- information about classes must also be protected from prying
eyes who have obtained the class files and using the debugger to get
information.
- 12
- 13
- looking for some hands on experience... i have bought and read LEARNING JAVA by niemeyer
i loved it but find i need some hands on experience.
any help?
kevin
--
Sometimes I'm in a good mood.
Sometimes I'm in a bad mood.
When all my moods have cum to pass
i hope they bury me upside down
so the world can kiss me porcelain,
white, Irish bottom.
- 14
- Run Excel Macro from JavaI want to run the macro present inside the excel sheet using the Java
code. Is is possible using Java code? Please help
- 15
- US-CA: Senior Software Engineers (Java) wanted Immediately!Cataphora is an award winning software company providing technology and
services for high end litigations and investigations. Its customers
include Fortune 500 companies, governmental agencies, and top American
law firms. We pride ourselves on having been funded from the start
entirely by revenues, with no venture capital investment. At Cataphora,
your creativity and versatility will be focused on a wide variety of
software development challenges and developing cutting-edge algorithms
for analyzing very large datasets. We are more than 80 people strong,
and continue to grow our employee-owned San Francisco Bay area company
by providing superior technology to meet the needs of our customers.
This is an excellent growth opportunity for the right candidate in a
rapidly growing, self-funded pre-IPO start-up.
Required Skills
- At least 4 years experience dealing with middleware or enterprise
software applications
- 3 years of Java experience
- Strong analytical and problem solving skills
Desired Skills
- Strong database experience
- Demonstrated ability to develop algorithms for solving complex
problems
- Development experience with a web-based application using J2EE
technologies
To apply, please send your resume (inline preferred; RTF, Word Doc or
PDF otherwise) to: email***@***.com - subject: "EU-DE-M09".
If you have any questions, feel free to contact me:
email***@***.com
Regards,
Markus Morgenroth
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