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- 1
- RMI and ThreadsI have a server applications, running on Win2003 and J2SDK 1.4.2_03 that
performs operations on a IBM mainframe. The flow of operations is like this:
- a client application (.NET) invokes a Web Service method (Tomcat and
Axis);
- the Web Service method invokes a method of a RMI Server, that then invokes
a method on a TServer object it references;
- this TServer object then uses a pool of mainframe session objects (Jakarta
Pool and IBM Host-On Demand) to fulfill the request;
- the result is moved again to the .NET client by way of return of the
methods invoked.
Everything worked fine until I begun test loading it, when I realized that
there was a bottleneck somewhere as no matter how I increased the number of
requests, the number of operations satisfied did not increase. With the help
of System.out I realized that only "RMI TCP Connection(2)" and "RMI TCP
Connection(3)" threads were at work for all the requests, which is naturally
a bottleneck.
Isn't it supposed that each RMI request generates a new thread (if existing
threads are servicing previous demands)? Why only 2 RMI threads? Is this
configurable?
Any simple way to change this (the application is already quite complex and
do not want to add a new Framework)?
I'm really in deep waters if I can't solve this, because I have something
like 450,000 operations to do (as a migration operation) which at the rhythm
of 25 a minute....
Thank you very much,
Araxes Tharsis
(email***@***.com)
- 1
- Eclipse IDE and jar filesHi,
At work, I see a number of Java files that do not have the 'import'
statements (such as "import org.apache.commons.lang.StringUtils") and so
Eclipse IDE 3.1 gives context-sensitive error message like 'StringUtils
cannot be resolved on lines where StringUtils are implemented. Is there a
way (to set up the classpath?add jar files? create user library?) in Eclipse
IDE to reference the jar files (commons-lang-2.1.jar, for example) so that
the import statements are not needed? Could someone show me how? Thank you.
- 2
- ParseException Error. Please Help!!Hello all!
Very new to Java need to complete this assignment for a school
project. The code below creates a few books (Title, Author or Authors,
Publisher, Number of pages, Publication Date etc.)
Methods have been developed to display a book's information and to
compare two books by title, number of pages and, HERE IS THE PROBLEM,
publication date.
Date has to be in the "dd-MM-yyyy" format.
The code works alright if we leave out the compPubDate method (line
55) and the calling of that method at line 95.
The message I get from the compiler is this:
Library.java:95: unreported exception java.text.ParseException; must
be caught or declared to be thrown
book2.compPubDate(book4);
There must be something wrong with my method that I don't understand.
Could anyone please help me fix this for me? Any help would be greatly
appreciated!
import java.util.*;
import java.text.*;
class Book {
String title;
String author1;
String author2;
String author3;
String pubdate;
String isbn;
int numpages;
String publisher;
Book(String title, String author1, String author2, String author3,
String pubdate, String isbn, int numpages, String publisher) {
this.title = title;
this.author1 = author1;
this.author2 = author2;
this.author3 = author3;
this.pubdate = pubdate;
this.isbn = isbn;
this.numpages = numpages;
this.publisher = publisher;
}
void bookData (Book book1) {
System.out.println("Title: " + book1.title + '\n' + "Author1: " +
book1.author1 + '\n' + "Author2: " + book1.author2 + '\n' + "Author3:
" + book1.author3);
System.out.println("Publication Date: " + book1.pubdate + '\n' +
"ISBN: " + book1.isbn + '\n' + "Number of Pages: " + book1.numpages);
System.out.println("Publisher: " + book1.publisher + '\n');
}
void compPages(Book otherBook) {
if (this.numpages > otherBook.numpages)
System.out.println("\nThe book " + this.title + ", has more pages
than book " + otherBook.title + " has\n");
else if (this.numpages < otherBook.numpages)
System.out.println("\nThe book " + otherBook.title + ", has more
pages than book " + this.title + " has\n");
else if (this.numpages == otherBook.numpages)
System.out.println("\nThe book " + this.title + ", has the same
pages as book " + otherBook.title + " has\n");
}
void compPublisher(Book otherBook) {
if (this.publisher.equals(otherBook.publisher))
System.out.println("The two books have the same Publisher: " +
this.publisher + '\n');
else
System.out.println("The two books DO NOT have the same Publisher" +
'\n');
}
void compPubDate(Book otherBook) throws ParseException {
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
Date d1 = df.parse(this.pubdate);
Date d2 = df.parse(otherBook.pubdate);
String relation;
if (d1.equals(d2)) {
relation = " have the same publication date";
System.out.println("Book: " + this.title + " and " +
otherBook.title + "," + relation);
}
else if (d1.before(d2)) {
relation = " was published before Book: ";
System.out.println("Book: " + this.title + relation +
otherBook.title);
}
else {
relation = " was published after Book: ";
System.out.println("Book: " + this.title + relation +
otherBook.title);
}
}
}
public class Library {
public static void main(String[] arguments) {
Book book1 = new Book("Before The Dawn", "Tim Birtas", "MFA",
"GSGA", "23-3-2004", "030-536-278-9", 105, "Epic ltd");
Book book2 = new Book("A Brief History of Time", "Stephen W.
Hawking", "", "", "01-3-1988", "055-305-243-8", 198, "Bantam Books");
Book book3 = new Book("Teach Yourself C", "Herbert Schildt", "", "",
"01-4-2000", "960-512-228-6", 635, "McGraw-Hill");
Book book4 = new Book("Computer Networks", "Andrew S. Tanenbaum",
"", "GSGA", "23-3-2004", "0-13-394248-1", 813, "Prentice Hall");
Book book5 = new Book("Programming Languages II", "Cleanthis
Trabulides", "", "", "01-01-2001", "960-538-174-5", 252, "EAP");
book4.bookData(book4);
book2.compPages(book4);
book2.compPublisher(book4);
book2.compPubDate(book4);
}
}
- 6
- experiences running Cold Fusion?Hi!
Anyone has experiences running Cold Fusion @ freebsd. Native or linux
emulation?
/Palle
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
- 8
- Sockets with unsigned appletsHi,
I'm working on a small java game applet that will need to connect to a
gameserver. The game server is different from the web server hosting
the applet.
From what I've read then the only way of doing this is by getting a
certificate and signing the applet - is this correct?
Or is there anyway to do this without a certificate?
Thanks,
--
Lasse Hassing, www.sinf.org
- 8
- Dynamic Network Printer Discovery and Administration via jcifs.samba.org.I am working on a large-scale reporting solution. One component is to
be able to scan the network for all printers and maintain a record of
these printers. I have read many, many posts on these forums with
similar questions, most of which do not have any answers. Below is the
progress I have made so far, hopefully someone can offer some
input/insight.
1. Finding Network Printers - I used jcifs to browse the network and
find all shared devices that were printers.
Code:
private static void findAllPrinters() throws Exception {
SmbFile root = new SmbFile("smb://domain;USR:PASS@domain");
Hashtable printerHash = new Hashtable();
searchForPrinters(root, printerHash);
Enumeration keys = printerHash.keys();
System.out.println("Number of Printers Found: " +
printerHash.size());
SmbFile file = null;
while (keys.hasMoreElements()) {
file = ((SmbFile)keys.nextElement());
System.out.println("UNC: " + file.getUncPath());
}
}
private static void searchForPrinters(SmbFile root, Hashtable
printers) throws Exception {
SmbFile[] kids= null;
try {
kids = root.listFiles();
} catch (Exception e) {
}
if (kids == null)
return;
for (int i = 0; i < kids.length; i++) {
if (kids[i].getType() == SmbFile.TYPE_WORKGROUP ||
kids[i].getType() == SmbFile.TYPE_SERVER)
searchForPrinters(kids[i], printers);
else if (kids[i].getType() == SmbFile.TYPE_PRINTER) {
printers.put(kids[i], Boolean.TRUE);
}
}
}
By doing this I can find each printer on my network that I can find
when I use windows control panel and search for network printers.
2. I can print a test to any printer successfully.
Code:
FileOutputStream fos = new
FileOutputStream("\\\\PrintShare\\MyPrinter"); //hardcoded for test,
but taken from output of part #1 above.
PrintStream ps = new PrintStream(fos);
ps.print("\r");
ps.print("This page will be printed directly to the printer.");
ps.print("\f");
ps.close();
3. This is where i need help. Continuing on what I have already
accomplished...
A. How can I create a more complex printer reference to allow me to
control number of copies, color vs. bw, page layout, page size, obtain
details from printer such as acceptable page sizes, data types
printable, etc.
B Be able to detect printer errors and if the page has completed.
And and all input and/or collaboration is apprecaited! I feel I am
close to finding the link, but not sure where to find the missing
puzzle piece.
Thx,
Rob
- 10
- Well spoken, John.Hi Joe Jitsu ( John ),
You wrote,
" Jeff, I've finally learned that c++ is just plain fun.
The money is now very secondary to me.
I don't know why I ever thought C++ was so difficult.
C++ can create open-source / cross-platform applets
better than any fly-by-night language such as C#.
I must learn, Jeff, Learn C++ ...
and then maybe ... just maybe ...
I won't be so horny anymore. "
Wow, John. I couldn't have said it better myself.
- 10
- newInstance() with generics howto?How could we 'clean up'(no ct error, no ct warning, no rt error nor
exception)
the following code? I tried everything conceivable and failed in all of
them.
------------------
import java.util.*;
import java.lang.reflect.*;
public class GetMethod{
public static void main(String[] args) {
Object obj = null;
Class<Hashtable> clazz = Hashtable.class;
Class<Class> claxx = Class.class;
try {
Method method = claxx.getMethod("newInstance");
obj = method.invoke(clazz);
}
catch (Exception e) {
e.printStackTrace();
}
Hashtable<String,String> ht = (Hashtable<String,String>)obj;
ht.put("foo", "bar");
System.out.println(ht.get("foo"));
}
}
-----------------------------------------------------------------------
- 10
- JAXB 2.0 Question?Hi,
I have created Java classes from an XSD using IntelliJ 6 and JAXB 2.0
plugin. I have populated the object and when I try to marshal the
object, I am getting ns2 appended to my root (default) element. I have
added a XmlRootElement tag to my root element. For the sake of
simplicity, I tried to unmarshal an XML file and then marshal it again
(without doing anything in between) as seen next:
My original XML file looks like the following:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><MSG
xmlns="http://xxx.yyy.com/"><ACKNOWLEDGEMENT>Success</
ACKNOWLEDGEMENT></MSG>
When I unmarshal it and marshal it again (doing nothing in between), I
get:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><MSG
xmlns:ns2="http://xxx.yyy.com/"><ns2:ACKNOWLEDGEMENT>Success</
ns2:ACKNOWLEDGEMENT></MSG>
I have used the same techniques before and they worked successfully. I
do not think the problem is with the XSD. Could you please tell me why
am I getting ns2 appended to my root element? and how can I get rid of
it?
Thanks in advance
- 10
- 11
- Swing design, components vs. containersHi,
Can anyone explain me (or guess on) the motivation for why the Swing
developers decided to let JComponent extend the AWT Container class and
not the AWT Component class?
I find it strange that Swing does not seperate containers from
components in the class hierarchy (ie. you can add buttons to buttons etc.).
Any comments on this issue would be appreciated.
--
Martin - http://925.dk
"Shoot for the moon, even if you miss, you'll land among the stars."
- 11
- Please, I am going insane: First element access causing ArrayIndexOutOfBoundsException:0Hello there,
Please God can someone help me before I break my PC.
I have a class that runs a query against an Oracle 10g database. The
query is returning the results I want.
I get two users which is what I want. I have an array created that has
a length of two.
I feed the results of the query into the array...
<code>
int[] engineers = new int[2];
String sql = "select USERID from g_user where role='Engineer'";
PreparedStatement pstmt = tempConn.prepareStatement(sql);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
engineers[i] = rs.getInt("USERID"); // find result of count
i++;
}
</code>
The very next thing if i try
<code>
System.out.println("engineer array length is " + engineers.length);
System.out.println("engineer array 0 is " + engineers[0]);
System.out.println("engineer array 1 is " + engineers[1]);
</code>
I get....
<code>
engineer array length is 2
java.lang.ArrayIndexOutOfBoundsException: 0
engineer array 0 length is 85
engineer array 1 length is 123
</code>
If i take out the first print message to find the length i get the
same error when i try to access the first element. If i take out the
message to access the length and the first element i get no error
whatsoever! but obviously i cannot do anything useful with my program
because i cannot access the first element.
I thought i was losing my mind, so i created a tiny program with just
this code on its own and it runs perfectly which is making me even
crazier!
What in the name of all that is good could be causing this?! I mean it
is printing out the correct contents and length of the array even
after it shows an error to say outofbounds!
Any help at all is very much appreciated...
Thank you,
J.
- 13
- JDBC to MS AccessHello,
I have just wanted to use such line to add one field into ms access
database:
st.executeUpdate("INSERT INTO DateTable (Date) VALUES (#2006-09-06#)");
Table DateTable has two fields: DateID (autoincrement) & Date
(date/time type). Compiling it I got an error:
"[Microsoft][ODBC Microsoft Access Driver] Syntax error in INSERT INTO
statement."
So it seems that my insert is not well formulated. Ok, but when I copy
it to MS Access I have no problems with running it (i.e. I get no
errors and a new row is added). Could you tell me what is going on?!?
Regards, mark
- 13
- McNealy gives it away``McNealy gives it away
``[...] McNealy?s intimates might provide the real clues as
to what it means. Jon Feiber, a Sun manager from 1983 to
1991, says in High Noon, a book about McNealy, that ?if
Scott blinks at all, Microsoft will eat his lunch.
Anything other than absolute conviction and unbelievable
maniacal desire to compete with Microsoft is going to
lose. You?re not going to beat Bill Gates by being
conciliatory or compromising.?
This deal looks like a loss. [...]''
--
__________
|im |yler http://timtyler.org/ email***@***.com Remove lock to reply.
- 16
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|
| Author |
Message |
MUK
|
 Posted: 2006-11-14 14:16:00 |
Top |
java-programmer, in jvm, how do you leap?
hi ..
can anyone please help me answer this questions..
i'm totally lost.. i dont know what leap really
means in this context.. and i dont know
how you would do that unknown thing in JVM..
any help is appreciated!!
thanks
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Andrew Thompson
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| Posted: 2006-11-14 17:14:00 |
Top |
java-programmer >> in jvm, how do you leap?
Sub: in jvm, how do you leap?
In Usenet newsgroups, how do you leap?
All over the place, it seems.
Please refrain from multi-posting.
(X-post to c.l.j.p./h., w/ f-u to c.l.j.h. only)
Andrew T.
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MUK
|
| Posted: 2006-11-14 20:16:00 |
Top |
java-programmer >> in jvm, how do you leap?
thanks for your great words of widsdom andrew...
but why is that so? do the exact same group of people
subscribe to all usenet groups?
-MUK
Andrew Thompson wrote:
> Sub: in jvm, how do you leap?
>
> In Usenet newsgroups, how do you leap?
> All over the place, it seems.
>
> Please refrain from multi-posting.
>
> (X-post to c.l.j.p./h., w/ f-u to c.l.j.h. only)
>
> Andrew T.
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Ian Wilson
|
| Posted: 2006-11-14 21:56:00 |
Top |
java-programmer >> in jvm, how do you leap?
MUK wrote:
> -MUK
> Andrew Thompson wrote:
>
>>Sub: in jvm, how do you leap?
>>
>>In Usenet newsgroups, how do you leap?
>>All over the place, it seems.
>>
>>Please refrain from multi-posting.
>>
> thanks for your great words of widsdom andrew...
> but why is that so? do the exact same group of people
> subscribe to all usenet groups?
I'd guess that a large proportion of active subscribers to c.l.j.h also
subscribe to one or more of the other *.java.* newsgroups.
This web page explains why multiposting is inappropriate and suggests
what you can do instead:
http://www.cs.tut.fi/~jkorpela/usenet/xpost.html
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Index ‹ java-programmer |
- Next
- 1
- 2
- Bug#388596: gcj-4.1: CharsetEncoder.canEncode() gives different results than Sun versionPackage: gcj-4.1
Version: 4.1.1-13
Severity: normal
The following test program gives different results with gcj and Sun JDK:
// A.java
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
public class A {
public static void main(String[] args) throws java.io.IOException
{
CharsetEncoder enc = Charset.forName("US-ASCII").newEncoder();
System.out.println(enc.canEncode('\u00e4'));
}
}
// end
$ javac A.java
$ /usr/lib/jvm/java-1.5.0-sun/bin/java A
false
$ /usr/lib/jvm/java-gcj/bin/java A
true
The Sun version seems to return something like (c > 31 && c < 127),
which makes sense, whereas gcj always gives true.
This breaks lots of code, such as Apache JaxMe 2 version 0.51
(specifically the MarshallerTest in the test suite, which generated
invalid XML with gcj).
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.17-1-686
Locale: LANG=sv_SE.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8)
Versions of packages gcj-4.1 depends on:
ii gcc-4.1 4.1.1-13 The GNU C compiler
ii gcj-4.1-base 4.1.1-13 The GNU Compiler Collection (gcj b
ii gij-4.1 4.1.1-13 The GNU Java bytecode interpreter
ii java-common 0.25 Base of all Java packages
ii libc6 2.3.6.ds1-4 GNU C Library: Shared libraries
ii libc6-dev 2.3.6.ds1-4 GNU C Library: Development Librari
ii libgcc1 1:4.1.1-13 GCC support library
ii libgcj7-dev 4.1.1-13 Java development headers and stati
ii libgcj7-jar 4.1.1-13 Java runtime library for use with
ii zlib1g 1:1.2.3-13 compression library - runtime
Versions of packages gcj-4.1 recommends:
ii fastjar 1:4.1.1-13 Jar creation utility
-- no debconf information
--
To UNSUBSCRIBE, email to email***@***.com
with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 3
- Re:Clearlooks is unsupported??Hi,
I am using RePast simulation package with Java 1.5 on Fedora Core 4.
When I run the model (see below), I get the following message. The
program works, but it generates pretty ugly interface.
Could anyone please let me know how to solve this problem??
Thank you.
-----------------------------------------------------------------
[jonghook@localhost GayModel]$ java -cp .:${REPASTJ}/repast.jar
GayModel
/usr/share/themes/Clearlooks/gtk-2.0/gtkrc:49: Engine "clearlooks" is
unsupported, ignoring
-------------------------------------------------------
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I wonder if there is any available Web-based Calendar module that
allows users to enter/edit event, set repeating frequency and reminder
of the event. I need something written in JSP.
Thanks in advance.
Tung Chau
- 5
- Struts and mapped propertyHi
I'm using Struts with DynaActionForm wich as 3 to 8 Map as property, so I'm
using mapped property.
When I put them into HTML form it result in INPUT fields having names like
'map1(property1)' this leads to problems in writing Javascript.
Can I use another format in mapped property names?!
thanx
--
ShadowMan
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- java to java networkingI have not written any socket code before or done any RMI.
I'd like to do the developer certification and also I have my own project
waiting in the wings that would benefit from this. The latter is my primary
concern.
I have a distibuted java application (is this the right term?) that exists
on many users PCs on a network. This is essentially just gui code. I then
have a central java 'server' application that applies the model & all the
business rules.
The view application needs to deal just with the business app, which in turn
deals with the data layer, MySQL, Flatfile or whatever. I think this is
pretty standard practice?
My basic understanding so far is that I should define the interface by which
the protocol operates. I'm not entirely sure how to do this and what else I
need to do, though I imagine proper threading will form a crucial aspect of
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Can anyone recommend a good book that assumes half decent OO & java skills,
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book 'complete java2 certification' but it glosses over a great deal of
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Does anyone know of anything online that would help me?
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TIA
--
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Super Visual Basic eBook Library only ?!
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That being said, I have been thrown feet first into a new project and
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So anyway I am using resource.properties files to store all of our
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This works great and I have no problem creating different property
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very similar. So I have come up with the idea that I would like to use
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localization scheme for the companies and states.
Here is is my idea. I would like to create a taglib that works exactly
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it looks for generic key for that company "promptname.company" if that
does not exist it looks for "promptname". If that key does not exist
it returns error or ???key?? as normal.
The idea is that we create a generic base for the application and
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me, heck, there may even already be a taglib out there that does this?
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sending requests and stripping off .company and .state until you found
one.
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email***@***.com
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I'm new here, so apologies if I ask this in the wrong way.
I have been programming in java for about 2 months, and am currently trying
to control an external application that I start using:
Process proc;
Runtime rt;
proc = rt.exec("java.exe -cp ... etc.. something");
Then I capture the input/output & error streams and thread them off.
The problem I have, is that I need to architect for the eventuality of the
external process locking up and not responding to requests. I have the
whole capturing of streams in a timeout, so I can tell when the external
program has not responded within a reasonable time, however when I issue the
proc.destroy() method, the java.exe process takes up almost 100% cpu and
never stops. I have to use operating system tools to perform a manual kill
of the process.
I can only assume that the proc.destroy() doesnt kill the entire process
tree, and because the command line starts off java.exe, which runs the
something.class file, a process is orphaned somewhere.
Any help would be much appreciated.
Thanks
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- 11
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my test environment
com.ibm.etools.rmic.RMICException: RMIC Command returns RC = 1.
at com.ibm.etools.rmic.RMICOperation.invokeCommandLine(Unknown Source)
at com.ibm.etools.rmic.RMICOperation.rmic(Unknown Source)
at com.ibm.etools.rmic.RMICOperation.generateStubs(Unknown Source)
at com.ibm.etools.rmic.UIRMICBeansOperation.generateStubs(Unknown
Source)
at com.ibm.etools.rmic.RMICOperation.run(Unknown Source)
at com.ibm.etools.ejbdeploy.EJBDeployer.visit(Unknown Source)
at com.ibm.etools.ejbdeploy.EJBDeployer.doExecute(Unknown Source)
at com.ibm.etools.ejbdeploy.EJBDeployer.execute(Unknown Source)
at com.ibm.wtp.j2ee.deploy.J2EEDeployOperation.deploy(Unknown Source)
at com.ibm.wtp.j2ee.deploy.J2EEDeployOperation.execute(Unknown Source)
at com.ibm.wtp.common.operation.WTPOperation.doRun(Unknown Source)
at com.ibm.wtp.common.operation.WTPOperation$1.run(Unknown Source)
at org.eclipse.core.internal.resources.Workspace.run(Unknown Source)
at org.eclipse.core.internal.resources.Workspace.run(Unknown Source)
at com.ibm.wtp.common.operation.WTPOperation.run(Unknown Source)
at com.ibm.wtp.common.operation.WTPOperationJobAdapter.run(Unknown
Source)
at org.eclipse.core.internal.jobs.Worker.run(Unknown Source)
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- 12
- 13
- Finding BCC receipientsIs there a way to see if a user (having sent you an email) has bcc'd
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Mark
******
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since the initializer is executed during deserialization.
In the java developer's almanac:
http://www.exampledepot.com/egs/java.io/DeserSingle.html
There's an example of a serializable singleton:
public class MySingleton implements Serializable {
static MySingleton singleton = new MySingleton();
private MySingleton() {
}
// This method is called immediately after an object of this
// class is deserialized.
// This method returns the singleton instance.
protected Object readResolve() {
return singleton;
}
}
If I add code to the constructor, it executes during
deserialization, so that doesn't work for me.
Is there someway to determine within a static initializer or
constructor that this object is being constructed and not being
deserialized? If there were I could execute code only during the one
construction of the object, and not again.
I was thinking that I could implement readObject/writeObject. But, how can
I implement writeObject? How do you represent the fields?
In the oreilly RMI book there is an example of a writeObject method,
but it doesn't explain how you are supposed to represent fields of the
object. I've looked around a bit and found nothing.
- 15
- fix horizontal sizeI have a JFrame that I'd like to fix so it is resizable vertically, but not
horizontally. I can't seem to come up with any simple way of doing this, but
it doesn't sound like it should be too difficult.
Can anybody help. If I need to make it a JWindow, or something else, that
shouldn't be a problem.
Cheers
Scott
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