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- 3
  - An efficient computation idea. Please commentHi,
    
    In my program I evaluate long trigonometric polynomials a lot! For example,
    
    final int N = 1000;
    double[] c = new double[N];
    // Populate c
    double x = .5, sum = 0.0;
    
    for (int i = 0; i < N; i++)
    sum += c[i]*cos(i*x);
    
    And this function is evaluated very many times (about 100,000). So why not
    create a java snippet, compile it, load it as a class and use the compiled
    version. So I would have something like;
    
    String sum = "0"; // A String buffer, of course...
    for (int i = 0; i < N; i++)
    sum += "+" + c[i] + "*cos(" + i + "*x)";
    sum += ";";
    
    I think it's a pretty cool idea. But before I implement it, I would like to
    know what you think about it!
    
    Thank you in advance!
    
    Aaron Fude
- 4
  - JSplitPane/JScrollPane Problem?Hey,
    I'm writing an interface that has a verticle split pane, the top
    and bottom of which both contain JScrollPanes with JEditor panes inside
    each scrollpane. It sits within a JTabbedPane which is in a
    JInternalFrame on a JDesktopPane.
    
    JDesktopPane --> JTabbedPane --> Tab --> JSplitPane --> 2 ScrollPanes
    --> 2 JEditorPanes.
    
    The first EditorPane is a source area and the second is an error
    output area. It's been working fine for me, which makes my current
    dilema even worse.
    
    I need to do the same format of error for an output tab so that
    the output area is on top and the error output is on bottom. I took
    the code from the previous working implementation and ported it and for
    some reason it didn't work. The top component JScrollPane-->
    JEditorPane does not show, but the bottom one does. Also, if I just
    add the JScrollPane instead of the JSplitPane to the tab, it still
    doesn't show, leading me to believe that it is a problem with the
    implementation of the JScrollPane. Here are the code snippets of the
    working and non-working portions of my code.
    
    -----Working-----
    source = new JEditorPane();
    sourceError = new JEditorPane();
    sourceError.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(source,
    
    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
    
    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    
    scrollPane.setBorder(BorderFactory.createEmptyBorder());
    JScrollPane errorScrollPane = new
    JScrollPane(sourceError);
    
    errorScrollPane.setBorder(BorderFactory.createEmptyBorder());
    sourceSplit = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
    scrollPane,
    errorScrollPane);
    
    sourceSplit.setBorder(BorderFactory.createEmptyBorder());
    -----Not Working-----
    expressionOut = new JEditorPane();
    outputError = new JEditorPane();
    expressionOut.setEditable(false);
    outputError.setEditable(false);
    JScrollPane outputScroller = new
    JScrollPane(expressionOut,
    
    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
    
    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    
    outputScroller.setBorder(BorderFactory.createEmptyBorder());
    JScrollPane outErrorScroller = new
    JScrollPane(outputError);
    
    outErrorScroller.setBorder(BorderFactory.createEmptyBorder());
    sourceSplit = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
    outputScroller, outErrorScroller);
    
    outputSplit.setBorder(BorderFactory.createEmptyBorder());
    -----How They Are Added-----
    tabFrame.addTab("Source", sourceSplit);
    tabFrame.addTab("Output", outputSplit);
    ---------------
    Any Ideas on why it isn't showing expressionOut?
- 4
  - Running a servlet with TomcatHi,
    
    When I use the following URL in Internet Explorer:
    
    http://localhost/servlet/HelloWorldExample
    
    I get an error message:
    -----8<------------
    HTTP Status 404 - /servlet/HelloWorldExample
    --------------------------------------------------------------------------------
    type Status report
    message /servlet/HelloWorldExample
    description The requested resource (/servlet/HelloWorldExample) is not
    available.
    
    --------------------------------------------------------------------------------
    Apache Tomcat/5.5.17
    -----8<------------
    
    I have the HelloWorldExample.class file in
    C:\Tomcat5.5\webapps\ROOT\WEB-INF\classes.
    Can anyone help me please?
    
    Best regards,
    
    Matheas Manssen
- 4
  - UK Postcodes anyone know of a service ?Hi
    
    My latest web application provides a search facility.
    
    You sign up as a member and get a free entry in a searchable database.
    
    I would like to offer a postcode search so that if someone is looking for a
    particular service they can enter a postcode and return results within a number
    of miles of the input postcode(s). I have seen this sort of search on a number
    of sites to date and I was wondering if anyone knows of a web service or other
    online service that will accept a post code (and some other params of course)
    and return a list of postcodes within a parameters distance.
    
    Once I have the list I can search my own database for results.
    
    The service must be available over the network, I'm not intetested in static
    databases that I have to install on the server (well I might be if they were
    FREE :-).
    
    Has anyone implemented such a thing ?
    
    Does anyone know of such a service ?
    
    Has this got anything to do with the group ? well I suppose not other than I
    write in Java.
    
    Cheers
    anyway
    
    Duncan
    
    "Process- How will the work and the team be organized?
    The team needs to fit the culture in which it will operate,
    but you should write software well rather than preserve the
    irrationality of an enclosing culture" - Kent Beck
- 6
  - Please help..nu bee correct probable path.. (?)
    ahmed khalak wrote:
    > Hi
    > Thank in advance.... I am getting error when I run from prompt (cmd)..
    > I installed Jdk1.5.0_09 path is C:\Program files\Java\Jdk1.......
    > I have oracle 9i and oracle 10g installed...
    > Path and classpath I have put correctly in windowxp.. as follow
    > path=C:\oracle..etc ;C:\Program File\java\Jdk1.5.0_09\bin
    > classpath= .;C:\Program File\java\Jdk1.5.0_09\lib\root.jar
    > Now when I check version for java and javac.. in other then Jdk1 directory
    > I am getting version 1.3.1 where as jdk gives me it version I checked oracle
    > directories
    > In Oracle directory.. jre show 1.3.1 directory...
    > how can I correct this problem.. my simple program compiles but running from
    > promp gives error..
    >
    > would highly appreciate help
    > :-) just starting learning Java..
    >
    > A Khalak
    
    Change the path setting so it reads:
    
    PATH=C:\Program File\java\Jdk1.5.0_09\bin;C:\oracle;...
    
    The OS looks for commands on the PATH from left to right, so starting
    with java, then oracle, and so on.
    
    Besides this. The classpath setting isn't really needed. This is a
    general note which might bring in problems later. If you don't have a
    real need for it, simply remove the classpath setting. You can still
    pass it to the java command using the "-classpath" switch.
    
    Regards,
    
    Bart
- 6
  - Getting JAVA_HOME at runtimeHello,
    
    The Java ports infrastructure provides JAVA_HOME on build-time to
    port's Makefile. But is it possible to get this variable from
    /usr/local/bin/java at runtime?
    
    How to change the Java version for a port at runtime in the rc
    script? It is possible to set the preferred JDK in
    /usr/local/etc/javavms but then JAVA_HOME still needs to be
    set manually.
    
    I would like to avoid hard-coding the JAVA_HOME at build time in
    the rc scripts.
    
    Any idea?
    --
    Jean-Baptiste Quenot
    aka John Banana Qwerty
    http://caraldi.com/jbq/
- 6
  - empty interfaces via reflectionOn Oct 14, 12:17 pm, "Aryeh M. Friedman" <email***@***.com>
    wrote:
    > On Oct 14, 6:01 pm, Steven Simpson <email***@***.com> wrote:
    >
    >
    >
    > > Aryeh M. Friedman wrote:
    > > > Then how do you handle the return type?!?!?!? Namely I can't do:
    >
    > > > Class<?> testClass = loadTestClass();
    > > > Object testInstance = testClass.newInstance();
    > > > Result res=new Result();
    >
    > > > for (Method method: testClass.getDeclaredMethods())
    > > > res.merge((Result) method.invoke(testInstance, new
    > > > Object[0])); // cast exception
    >
    > > > The reason why it is not possible is any Result object created by a
    > > > test is <MyClassLoader>.Result and all the results here are
    > > > <SystemClassLoader>.Result
    >
    > > Looking back at an earlier post, your custom MyClassLoader goes like this:
    >
    > > > public class MyClassLoader extends ClassLoader
    > > > {
    > > > public Class loadClass(String name)
    > > > {
    > > > try {
    > > > if(name.startsWith("java."))
    > > > return super.loadClass(name);
    >
    > > A custom ClassLoader is expected to override findClass(String) rather
    > > than loadClass(String), as the latter (indirectly) accomplishes this
    > > behaviour:
    >
    > > <http://java.sun.com/javase/6/docs/api/java/lang/ClassLoader.html>
    >
    > > "When requested to find a class or resource, a ClassLoader instance will
    > > delegate the search for the class or resource to its parent class loader
    > > before attempting to find the class or resource itself."
    >
    > > MyClassLoader is loading Result instead of delegating to its parent
    > > first, which should always find it first.
    >
    > I just tested:import java.io.*;
    > import java.lang.reflect.*;
    >
    > public class MyClassLoader extends ClassLoader
    > {
    > public Class findClass(String name)
    > {
    > try {
    > //if(name.startsWith("java."))
    > // return super.loadClass(name);
    >
    > FileInputStream fis=new FileInputStream(name
    > +".class");
    > byte[] b=new byte[fis.available()];
    >
    > fis.read(b);
    > fis.close();
    >
    > return defineClass(name,b,0,b.length);
    > } catch(Throwable e) {
    > e.printStackTrace();
    > }
    >
    > return null;
    >
    > }
    >
    > and now the class loader no longer honors recompiled classes:
    >
    > Script started on Sun Oct 14 15:09:05 2007
    > jtest@monster:/home/jtest% java Main
    > 1
    > ^Z
    > Suspended
    > jtest@monster:/home/jtest% cat foo
    > import java.lang.reflect.*;
    >
    > public class MyClass
    > {
    > public MyClass()
    > {
    > ack=new Integer(2);
    > }
    >
    > public Integer getAck()
    > {
    > return ack;
    > }
    >
    > private int foo;
    > private Integer ack;}
    >
    > jtest@monster:/home/jtest% cp foo MyClass.java
    > jtest@monster:/home/jtest% javac MyClass.java
    > jtest@monster:/home/jtest% fg
    > java Main
    >
    > 1
    > ^C
    > jtest@monster:/home/jtest% exit
    > Script ends on Sun Oct 14 15:09:45 2007
    >
    > Just for ref here is the new main():
    >
    > public class Main
    > {
    > public static void main(String[] args)
    > throws Throwable
    > {
    > while(true) {
    > ClassLoader loader=new MyClassLoader();
    > Class klass=loader.loadClass("MyClass");
    >
    > MyClass m=(MyClass) klass.newInstance();
    >
    > System.out.println(m.getAck());
    > System.in.read();
    > }
    > }
    >
    > }
    
    You should simply use UrlClassLoader and have the system classpath not
    include your code that needs to be reloaded, and the URLClassLoader
    have the path that DOES need to be reloaded (creating a new instance
    of that class loader every time you need to reload the class)
    
    That way, Result will be properly loaded by the System class loader,
    and your reloadable class wont.
    
    Hoep this helps,
    Daniel.
- 8
  - The simplest way to show a large output string?Hi,
    What I want to do is quite simple: I want to show a large output String.
    The user then will press "OK"; then the output window disappears, and
    the program continues.
    
    The following code would be ok for me, but the real String I want to
    show is very long (let's say 1000 characters and 100 lines), so I need
    scrollbars...
    
    Could you please tell me the simplest way to achieve this? Thanks in
    advance for your help.
    
    ==========================
    package gui;
    import javax.swing.*;
    
    public class Prova {
    public static void main(String[] args) {
    String s = "hello";
    JOptionPane.showMessageDialog(null, s);
    System.exit(0);
    }
    }
    =====================
- 8
  - AspectJ: solution to Java's repetitiveness?thufir wrote:
    > On Sat, 26 Apr 2008 06:51:43 -0400, Lew wrote:
    >
    >>> attrib_writer :foo, :bar #getter and setter for foo and bar attributes,
    >>> #getter setter methods aren't actually written
    >> Well, Java cannot do that because it's not in the language definition
    >> and because the colon character already serves three other purposes in
    >> Java.
    >
    > That Ruby syntax doesn't work in Java isn't the point at all.
    >
    >> I would just go with getters/setters. What's the big deal? My IDEs
    >> generate them for me, so there's no typing, and it sure helps
    >> maintainers to see them.
    >>
    >> It would be a huge waste of energy to retrofit Java with such a feature.
    >
    > The point is that getter/setter methods are boilerplate. Adding such a
    > feature to Java would be worth it, and Java is constantly in flux.
    >
    >
    > -Thufir
    
    Can't you just add a (custom) annotation, e.g. "@JavaBean", and use
    apt to generate the getters/setters? (Or possibly the newer
    javax.annotation* stuff?) You could add options to such an
    annotation e.g., read-only.
    Then add the one extra line in your ant script to build code.
    
    Note JavaEE defines many such annotations, including for an
    MX Bean. Adding a standard annotation "@JavaBean" doesn't seem
    like it would be that much effort, for a large convenience payoff.
    
    <waffle>
    Like Lew I use an IDE that does that for me. Still, I don't like
    dependencies on particular tools that provide special features, if
    the language could easily support them with little effort.
    
    OTOH as others have pointed out in previous threads, the JavaBean
    spec is rarely used, so maybe adding more standard annotations
    isn't worth it.
    
    If the OP thinks it should be used, create or modify a JSR for this
    feature; if enough others agree it will be added.
    </waffle>
    
    -Wayne
- 8
  - garbled JFrame
    
    Ive got a a JFrame class displaying many JLabels with images inside.
    It displays fine and I can drag it around the desktop ok.
    But when I drag another window over the JFrame my JFrame gets garbled.(get
    multiple images of the labels)
    Even when i minimize it and maximize it is still garbled.
    
    why would that be?
    
    TIA
    
    patrick
- 9
  - Simple GUI Image ProblemComputing student here, haven't used java for a while. Anyways, could someone put some example code as to how to put an image from a file onto a JPanel or JFrame. I just can't remember.
- 9
  - Critical Problem with Tomcat 3.3.1 and SSLHello,
    
    I am having a serious problem trying to set up SSL on Tomcat 3.3.1 on
    Windows 2000. I am following the jakarta guidelines exactly as they
    propose, but I am having absolutely no luck. What am I doing wrong?
    
    Here is the procedure I follow:
    
    First, I run the following command -
    
    keytool -genkey -keyalg rsa -alias name -keystore name
    - I then answer the questions. I tried setting the common name as
    my name, and a second time as the the URL used to access the site in
    question, ie: sitename.com
    
    Then, I issue the following command -
    
    keytool -certreq -keystore name -alias name -file name.csr
    
    Next, I send the name.csr file to the CA, and recieve 3 certificates.
    The 3 certificates I receive are RootCert.cer, IntCert.cer and
    NewCert.cer. So, I then issue the following commands in this order:
    
    keytool -import -trustcacerts -file RootCert.cer -alias rootcert
    -keystore name
    keytool -import -trustcacerts -file IntCert.cer -alias intcert
    -keystore name
    keytool -import -trustcacerts -file NewCert.cer -alias newcert
    -keystore name
    
    After each command I receive confirmation that the certification was
    properly inserted. I then copy the 'name' file to TOMCAT_HOME/conf
    and edit the server.xml file. I add the following lines to the
    server.xml file:
    
    <Http10Connector
    port="8443"
    secure="true"
    keystore="c:\tomcat\conf\name"
    keypass="password"
    clientauth="false"/>
    
    Now, I restart tomcat and assume that everything should be in order.
    When starting tomcat via the batch file, I see that an Http10Connector
    is correctly sitting on port 8443. So, I try accessing the site
    normally, and everything works fine. However, if I attempt an HTTPS
    request to the site, I receive a page cannot be displayed error. This
    is strange, because I figured that at this point it should work.
    Well, I then attempted to access it manually by addressing
    localhost:8443 .... this is where I noticed a problem. Once the
    request is sent to Tomcat, Tomcat throws the following exception:
    
    PoolTcpEndpoint: Handshake failed
    javax.net.ssl.SSLException: Unrecognized SSL handshake.
    at com.sun.net.ssl.internal.ssl.InputRecord.read(DashoA6275)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA6275)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA6275)
    at com.sun.net.ssl.internal.ssl.AppOutputStream.write(DashoA6275)
    at java.io.OutputStream.write(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(DashoA6275)
    at org.apache.tomcat.util.net.JSSESocketFactory.handshake(JSSESocketFactory.java:270)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:479)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:516)
    at java.lang.Thread.run(Unknown Source)
    ThreadPool: Caught exception executing
    org.apache.tomcat.util.net.TcpWorkerThread@3a8602, terminating thread
    java.lang.NullPointerException
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:498)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:516)
    at java.lang.Thread.run(Unknown Source)
    
    What is going on? Luckily, I have access to a CA, so this process
    isn't costing me anything, however I have attempted this multiple
    times with various certificates and various settings on the
    certificate and I always get this same exception. What's more, I
    tried creating a self signed certificate and I still get this
    exception. Am I doing something wrong? I have scoured the net
    countless times and it seems like all the instructions say the same
    thing. When I search for this error, none of the recomendations fit
    my situation. If no one knows how to fix this, could someone please
    recomend where I can go so that I can find the answer to this problem?
    
    Please help me out, this is driving me nuts. Thanks in advance,
    Dan
- 9
  - JAXB XML Max SizHello All:
    
    I am using JAXB to reading (unmarshall) a XML feed which
    is about 4GB of siz. The JAXB seems
    can not doing its job. Any one knows how to solve this problem?
    
    ps: does JAXB has a limitation over XML feed size?
    
    Many Thanks!
- 11
  - CVS checkout doesn't work in Eclipse v3.0.1Hi,
    Since the CVS functionality of NetBeans doesn't appear to work for
    me, I'm trying Eclipse. However, the CVS functionality of Eclipse
    doesn't appear to work either. When I try to do a CVS checkout in
    Eclipse, a "project" does get created in my workspace, but the
    contents of the CVS modules aren't actually in the project. Now, the
    contents of the module are only directories to this point, because I
    was looking to work on the module with Eclipse. Should this be a
    problem? Should I add a least one file to the project before Eclipse
    will properly checkout the module with all its subdirectories?
    
    Thanks,
    
    Jason
- 11
  - importing classs without package in JSP ?Hi,
    
    i am working on apache server web based project and i want to import a
    class without package in my JSP file.
    
    All my classes are in "WEB-INF/classes"
    
    if i use a package (such as "project") in a class (such as "match" )
    then i can import class "match" in jsp using
    
    <%@ page import="
    java.util.*,
    project.*
    "%>
    
    But if i dont have package then i dont know how to import my class in
    JSP. Thats what i want to know .
    
    PLease help me. i am really thankful to you guys.
    
    Sincerely,
    
    Jeff

Author

Message

Dan

Posted: 2007-5-12 1:34:00

Top

java-programmer, Still looking for a Job?

http://www.xrecruiter.com is a SPAM free Recruiter Community. Post
your resume for free, get noticed directly by recruiters. Register for
free.

Joe Attardi

Posted: 2007-5-12 2:08:00

Top

java-programmer >> Still looking for a Job? Dan wrote:
> http://www.xrecruiter.com is a SPAM free Recruiter Community. Post
> your resume for free, get noticed directly by recruiters. Register for
> free.

A spammer advertising a SPAM-free recruitment site?! My head asplode.

Mark Space

Posted: 2007-5-12 2:21:00

Top

java-programmer >> Still looking for a Job? Joe Attardi wrote:

> A spammer advertising a SPAM-free recruitment site?! My head asplode.

Excellently done, sir.

Joe Attardi

Posted: 2007-5-12 2:23:00

Top

java-programmer >> Still looking for a Job? Mark Space wrote:
> Excellently done, sir.

Why thank you. ;)

Eric Sosman

Posted: 2007-5-12 2:24:00

Top

java-programmer >> Still looking for a Job? Dan wrote On 05/11/07 13:34,:
>
> http://url-supressed is a SPAM [...]

Honesty at last.

--
email***@***.com

Lew

Posted: 2007-5-12 7:10:00

Top

java-programmer >> Still looking for a Job? Joe Attardi wrote:
> Mark Space wrote:
>> Excellently done, sir.
>
> Why thank you. ;)

Of course, by saying his site was SPAM free, the OP was telling us that it had
no canned meat made by Hormel. If he'd averred that it was spam free, that
would have been a whole other matter.

--
Lew

Dan

Posted: 2007-5-17 3:56:00

Top

java-programmer >> Still looking for a Job? On May 11, 7:09 pm, Lew <email***@***.com> wrote:
> Joe Attardi wrote:
> > Mark Space wrote:
> >> Excellently done, sir.
>
> > Why thank you. ;)
>
> Of course, by saying his site was SPAM free, the OP was telling us that it had
> no canned meat made by Hormel. If he'd averred that it was spam free, that
> would have been a whole other matter.
>
> --
> Lew

Thanks for your Comments..Fellas..

Index ‹ java-programmer

Next
- 1
  - Initialize managed bean with header information?We use Netegrity's SiteMinder for SSO security on all web apps.
    Although SiteMinder handles security for accessing the application
    itself, restrictions to certain functions and data are handled within
    the application based on user type.
    The user information (such as name, type, etc.) are passed in from
    SiteMinder via header variables. ie:
    hddr_user = Joe Blo
    hddr_group = Admin
    hddr_phone = 555-555-5555
    
    I'm looking at different designs to capture all of this user
    information from the headers at one time and store as a bean in the
    user's session (so as to not need to continually reference the header
    information).
    
    Does anyone know if you can create a managed bean (ie. User) that is
    initialized with header information (by using the configuration file
    w/ value-binding expressions)?
- 2
  - javax and macim running mac os 9.2 with MRJ SDK 2.2. im tring to compile a class
    importing javax.swing.*; it says it cant find it. i unziped all the
    jars and i cant find javax anywhere. is this not supported on this os.
- 3
  - Multiple installs of JDKWhen you do a silent install of the JRE you have the option to pass
    PRIVATE=1, resulting in an install which doesn't check the registry
    for a prior installation, and doesn't update the registry. You can
    therefore have more than one install of the same JRE.
    
    I need to find a similar capability for the JDK, but can't seem to. We
    get rc=1603 on the second JDK install.
    How can this be done...?
    
    JDK >= 1.5.
    
    {{{ Andy
- 4
  - LookAndFeelHi,
    
    I have a couple of issues I'm trying to resolve. Hopefully someone will have
    some ideas.
    
    First, I've been unsucessful trying to get the MotifLookAndFeel working.
    I've following every example I have (on paper) and nothing seems to work.
    I've run the app on both the PC and Linux box; the window looks and feel
    shows up on the PC and metal on the linux machine. Anyone know what's going
    on or what could be missing?
    
    Second, the app I've been working has a bunch of ToggleButtons and the color
    of the button changes based on selection. All I do is set the background
    color in the button press callback. Okay, fine. But when I run the code in
    linux, I'm unable to change the color of the "select" mode of the Toggle
    button. It always gray. Again. Does anyone know what's going on? From all my
    years, this should be extremely simple. Why would it work correctly on the
    PC and not in unix?
    
    Thanks in advance.
    
    Bryan
- 5
  - generate certificate from PEMHi,
    
    I am developing a middleware solution for our companyy. I have got 2
    certifcates clkey.pem and clcert.pem for the final application. How I
    can combine these 2 keys in 1 certificate? Do I need to first create
    self signed certificate?
    
    Thx in advance.
- 6
  - Running server-side Java on FreeBSD in production environments
    So, I've seen a few mentions here of folks using Java server apps on
    FreeBSD in production. I've been very happy to watch the progress by the
    Java team on the native JDKs from the sidelines, as well as the
    improvements to libc_r and such that have been MFC'd, but I'm curious as
    to whether the consensus on this list is that it's ready to be used for
    production. Anyone want to share good success or horror stories? We're
    trying to determine whether the apache.org box can start to run our own
    software. :) Speed is definitely less important than proper functioning.
    
    Brian
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- 7
  - JTable and Custom Default Cell Editors
    From: "Erica Wheatcroft" <email***@***.com>
    Subject: JTable
    Date: Thursday, January 20, 2005 4:17 PM
    
    HI -
    
    I have a jtable that uses two custom default cell editors to create combo
    boxes for two of the the 4 columns. If the user selects another value from
    either of the combo boxes i want to know that so i can indicate a save must
    occur. I'm not sure what event i should listen to? Does any one have any
    suggestions?
    
    Thanks in advance.
    
    Erica
- 8
  - getting Error: could not find libjava.so Re: building a jdk1.5
    On Mar 3, 2007, at 5:18 PM, Bill Moran wrote:
    
    >
    >> On Mar 3, 2007, at 4:01 PM, Chad Leigh -- Shire.Net LLC wrote:
    >>
    >>> Hi
    >>>
    >>> I am trying to build jdk15 inside my jail with PREFIX set to /usr/
    >>> public (At one time I successfully got jdk 1.4 to build after much
    >>> hacking)
    >>>
    >>> I have the option for builing inside a jail set. We get to the
    >>> point where the linux java is installed and it is actually building
    >>> the jdk
    >>>
    >>> # Start of jdk build
    >>> /libexec/ld-elf.so.1: /usr/local/lib/libiconv.so.3: Undefined
    >>> symbol "__mb_cur_max"
    >>> *** Error code 1
    >>>
    >>> Stop in /usr/ports/java/jdk15.
    >>> #
    >>>
    >>> I am not exactly sure what it is doing at this point in order to
    >>> hack round it. libiconv a fresh install from ports
    >>>
    >>
    >> Turns out that the issue is that gmake cannot run. I have not
    >> figured out why yet, having removed and reinstalled libiconv and
    >> gmake and getting the same error. But it is not java related.
    >>
    >> I'll redirect this to -questions
    >>
    >> If anyone has an idea on why gmake would fail as above on a fresh
    >> install, 6.2-RELEASE from a day or two ago, I would appreciate it.
    >> Please CC me as I am not currently subscribed to -questions, though I
    >> am on -java
    >
    > Not a direct answer to your question, but when I needed to do this
    > a few months ago, I just did a "make package" on my workstation, then
    > shipped the package up to the jail system and installed it with
    > pkg_add.
    >
    > Doesn't solve the problem, but if you're in a pinch, it's a handy
    > workaround.
    >
    
    OK, I had never done this before -- built a package from a port. So
    I did this on the base machine and then copied it into the jail and
    did a pkg_add like so
    
    # pkg_add -P /usr/public -v jdk-1.5.0p4_1.tbz
    
    as I wanted it installed in my local policy dir /usr/public (which
    gets mounted RO in every jail). My 1.4.2 java on my other jail
    server is installed like this (but was built inside the jail many
    moons ago).
    
    Now, when I try to run java I get
    
    # java -version
    Error: could not find libjava.so
    Error: could not find Java 2 Runtime Environment.
    #
    
    Java is in /usr/public/jdk1.5.0/ (the same as my 1.4.2 on the other
    server which is in /usr/public/jdk1.4.2/). libjava.so is inside the
    lib dir and I thought that java was referential to itself so it could
    find its libraries.
    
    I also tried setting JAVA_HOME and JRE_HOME though I have not had to
    do that in a long time.
    
    The new 1.5 jdk is registered in the javavms file .
    
    When I run the javavm script with /bin/sh -x it does run the correct
    java and running it with an explicit path does not help.
    
    # /bin/sh -x /usr/public/bin/javavm -version
    + _JAVAVM_SAVE_PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/pub/
    sbin:/usr/pub/bin:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin:/root/
    bin
    + export PATH=/bin:/sbin:/usr/bin:/usr/sbin
    + _JAVAVM_PREFIX=/usr/public
    + _JAVAVM_CONF=/usr/public/etc/javavms
    + _JAVAVM_OPTS_CONF=/usr/public/etc/javavm_opts.conf
    + basename /usr/public/bin/javavm
    + _JAVAVM_PROG=javavm
    + _JAVAVM_MAKE=/usr/bin/make
    + [ javavm = javavm ]
    + echo javavm: warning: The use of 'javavm' as a synonym for 'java'
    is deprecated
    javavm: warning: The use of 'javavm' as a synonym for 'java' is
    deprecated
    + _JAVAVM_PROG=java
    + [ -r /usr/public/etc/javavm_opts.conf ]
    + . /usr/public/etc/javavm_opts.conf
    + _JAVAVM_OPTS=
    + setJavaHome
    + realpath
    + realpath /usr/public
    + [ -n -a /stubs/usr_local/etc/ssmtp != /usr/public ]
    + unset JAVA_HOME
    + _JAVAVM_PORTSDIR=
    + [ -r /usr/share/mk/bsd.port.mk ]
    + /usr/bin/make -f /usr/share/mk/bsd.port.mk -V PORTSDIR
    + _JAVAVM_PORTSDIR=
    + _JAVAVM_BSD_PORT_MK=
    + [ -n -a -r /Mk/bsd.port.mk ]
    + [ -n ]
    + [ ! -e /usr/public/etc/javavms ]
    + sed -E s|[[:space:]]*#.*||
    + uniq
    + _JAVAVM_VMS=/usr/public/jdk1.5.0/bin/java
    /usr/public/linux-sun-jdk1.4.2/bin/java
    + [ -n ]
    + dirname /usr/public/jdk1.5.0/bin/java
    + JAVA_HOME=/usr/public/jdk1.5.0/bin
    + dirname /usr/public/jdk1.5.0/bin
    + JAVA_HOME=/usr/public/jdk1.5.0
    + basename /usr/public/jdk1.5.0
    + _JAVAVM_VM=jdk1.5.0
    + [ -n ]
    + [ -n ]
    + [ -n ]
    + [ -n /usr/public/jdk1.5.0 -a -f /usr/public/jdk1.5.0/bin/java ]
    + _JAVAVM_PROG_PATH=/usr/public/jdk1.5.0/bin
    + return 0
    + [ 0 != 0 ]
    + [ -x /usr/public/jdk1.5.0/bin/java ]
    + basename /usr/public/jdk1.5.0
    + setJavaOptions java jdk1.5.0
    + echo java
    + sed -e s/\./_/g -e s/-/_/g
    + local OPTS_PROG=java
    + echo jdk1.5.0
    + sed -e s/\./_/g -e s/-/_/g
    + local OPTS_JAVA_HOME=jdk1_5_0
    + eval echo ${JAVAVM_OPTS_jdk1_5_0_java}
    + local JAVA_HOME_PROG_OPTS=
    + eval echo ${JAVAVM_OPTS_jdk1_5_0}
    + local JAVA_HOME_OPTS=
    + eval echo ${JAVAVM_OPTS_java}
    + local PROG_OPTS=
    + [ -n ]
    + [ -n ]
    + [ -n ]
    + [ -n ]
    + export JAVA_HOME
    + tryJavaCommand /usr/public/jdk1.5.0/bin/java -version
    + [ -n ]
    + [ -x /usr/public/jdk1.5.0/bin/java ]
    + [ -n /sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/pub/sbin:/usr/
    pub/bin:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin:/root/bin ]
    + export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/pub/sbin:/
    usr/pub/bin:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin:/root/bin
    + exec /usr/public/jdk1.5.0/bin/java -version
    Error: could not find libjava.so
    Error: could not find Java 2 Runtime Environment.
    #
    
    What did I do wrong?
    
    Thanks
    Chad
    
    ---
    Chad Leigh -- Shire.Net LLC
    Your Web App and Email hosting provider
    chad at shire.net
    
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- 9
  - Tomcat on Windows: JAVA_HOME & -Dsun.io.useCanonCaches'Apologies for posting this here, but I couldn't find any Tomcat user
    forum.
    
    A colleague is currently trying to run Tomcat 4.1.30 on Windows 2000
    Professional. She first installed JRE2 1.4.2_08, and set %JAVA_HOME%
    to the directory C:\j2re1.4.2_08 - I've run "java -version" and it
    works fine.
    (%JAVA_HOME%/home is in the path correctly).
    
    She then installed Tomcat to C:\jakarta-tomcat-4.1.30.
    
    However, when she runs catalina.sh start, she gets the following
    error:
    
    The JAVA_HOME environment variable is not defined correctly
    This environment variable is needed to run this program
    Using CATALINA_BASE: C:\jakarta-tomcat-4.1.30
    Using CATALINA_HOME: C:\jakarta-tomcat-4.1.30
    Using CATALINA_TMPDIR: C:\jakarta-tomcat-4.1.30\temp
    Using JAVA_HOME: C:\j2re1.4.2_08
    '-Dsun.io.useCanonCaches' is not recognized as an internal or external
    command,
    operable program or batch file.
    
    I've even tried adding the following to catalina.bat without success:
    
    if not "%JAVA_HOME%" == "" goto gotJavaHome
    set JAVA_HOME=C:\j2re1.4.2_08
    :gotJavaHome
    
    Can anyone see where we might be going wrong?
    
    Cheers,
    
    P.
- 10
  - Problem in configuring SSL in Tomcat5.5Hi,
    
    I have Tomcat5.5 and J2sdk5 installed on my system. I wanted turn on
    SSL services in tomcat. I went through the Tomcat Documentation and
    did it exactly. I modified server.xml as below,
    
    
    
    <Connector port="8443" maxHttpHeaderSize="8192"
    maxThreads="150" minSpareThreads="25"
    maxSpareThreads="75"
    enableLookups="false" disableUploadTimeout="true"
    acceptCount="100" scheme="https" secure="true"
    clientAuth="false" sslProtocol="TLS" />
    
    I also created certificate using keytool with default password as
    "changeit" and alias as "tomcat".
    
    I restarted the tomcat services too, and then tried to access the page
    but i am not able to access it using https connection. Where as i am
    able to access same page using Http connection.
    
    Secondly, I am not able to access default tomcat Page too using Https
    connection. Everything works fine in case of HTTP connection.
    
    Following is the way iam trying to acces the page,
    
    https://localhost:8443
    
    Can any one help me out to find the problem.
    I have IE 6 with SP2 installed on my system.
    
    Thanks
    Minesh
- 11
  - passing RequestPath to error page from web.xmlHi,
    
    I have pointed any errors to Error.jsp in my web.xml file (as shown).
    
    <error-page>
    
    <error-code>500</error-code>
    
    <location>/Error.jsp?id=500</location>
    
    </error-page>
    
    As you can see I also pass the type of error, is there any way I can
    pass the RequestPath that resulted in the error in the first place?
    
    Cheers,
    Paul
- 12
  - How do i implement this interfacepublic interface AQuestion
    {
    public abstract void someMethod() throws Exception;
    }
    
    http://www.angelfire.com/or/abhilash/Main.html
    
    see Question no 5.
    
    How do i implement this interface ?
    
    (1) problem is, it has an abstract method and hecne its complicated
    to implement this class.
    
    (2) another problem is, it is the public interface and hence we can not
    make one more public class in the same file....because 1 file can have
    only 1 public access specifier.
    
    is it really possible to implement this interface ?
- 13
  - Help to understand 'array of classes' exampleHi,
    
    I'm trying to create/use an array of classes, and I found the following
    code snippet using Google Groups:
    
    ...
    rectangle[ ] array_name = new rectangle[ 100 ]; // or whatever
    size
    for ( int n = 0; n < 100; ++n )
    {
    array_name[ n ] = new rectangle( );
    }
    ...
    int i = 99;
    int wide = array_name[i].getwidth( );
    ...
    
    The above snippet was from:
    
    http://groups.google.com/group/comp.lang.java.programmer/msg/1ea4bbde51104914
    
    What I'm trying to understand in the above snippet is the line where the
    array is initialized:
    
    rectangle[ ] array_name = new rectangle[ 100 ]; // or whatever size
    
    Before I found that post, I was trying something like:
    
    rectangle [] arrayName; // declear an array of 'rectangle classes'
    .
    .
    rectangle[0] = new rectangle(); // instantiate rectangle/populate array
    rectangle[1] = new rectangle(); // instantiate rectangle/populate array
    
    I did it that way because I don't know the number of classes that I'll
    want to have in the array of classes ahead of time.
    
    The code per the snippet from the cited posts works, but my original
    code would get a NullPointerException, and I don't understand why.
    
    Can someone explain this?
    
    Also, is it possible to do this in a way that I don't have to allocate a
    fixed size array?
    
    Thanks,
    Jim
- 14
  - J2ME internationalizationI want to provide the binary with *only one* language, because I want to
    be as small as I can.
    
    But I want to provide many binaries (one per language).
    
    So, I write the code with hardcoded strings like "$_nearest_dist_$".
    I write a file like:
    -----english.ini----
    $_nearest_dist_$=Nearest distance is 90m
    --------------------
    and I write a php script which in *.java files, replaces all strings in
    form "$_*_$" with language correct string.
    php phpWriteStringsToSource.php <project_folder> <language.ini>
    
    THE BIG PROBLEM: I realize that *.java files must have ansi* encoding!
    Any of utf-8, uc16le or be is not compiled correct!
    
    So, what I can do?
- 15
  - TableCellRender puzzleBelow is a fairly simple TableCellRenderer for displaying an enum as
    an Icon. That works fine. But I added a wrinkle, changing the
    background colour depending on whether the row is selected.
    
    No background colour changes happen, even though isSelected is true
    when it should be. I wonder if I am missing something obvious.
    
    package com.mindprod.vercheck;
    
    import javax.swing.*;
    import javax.swing.table.TableCellRenderer;
    import java.awt.*;
    
    /**
    * render a the AppSate enum cell, use icon without text.
    */
    final class AppStateRenderer implements TableCellRenderer
    {
    // ------------------------------ FIELDS
    ------------------------------
    
    private static final JLabel template = new JLabel( "",
    JLabel.CENTER );
    
    private Color background;
    
    private Color selectedBackground;
    
    // -------------------------- PUBLIC INSTANCE METHODS
    --------------------------
    /**
    * constructor
    *
    * @param background background colour
    * @param selectedBackground background colour when seleced
    */
    public AppStateRenderer( Color background, Color
    selectedBackground )
    {
    this.background = background;
    this.selectedBackground = selectedBackground;
    }
    
    public Component getTableCellRendererComponent( JTable table,
    Object value,
    boolean
    isSelected,
    boolean hasFocus,
    int row,
    int column )
    {
    System.err.println( "selected:" + isSelected + " " + row + " "
    + table.getSelectedRow() );
    
    template.setIcon( ( (AppState) value ).getIcon() );
    template.setBackground( isSelected? selectedBackground :
    background );
    
    return template;
    }
    }
    --
    Roedy Green, Canadian Mind Products
    The Java Glossary, http://mindprod.com