1.2 Certification info

1999-05-31 Thread Ozer Irfan

Hello,
I search information about Java 1.2 certification exam.

Have you exam simulation applet ?
Or documentation ?

Please send me.

Thanks.

Irfan

 
__
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Debug jserv.properties

1999-05-31 Thread Roland Carlsson

Hi!
I've got a little debuging problem. When trying to start my Apache-JServ server the 
jserv.log-file get 
(ERROR) an error returned cleaning-up protocol "wrapper"
(ERROR) in init all protocols "wrapper" returned an error

My problem is that i checked all wrapper-parameters over and over again and can't find 
anything that is wrong. Is there a way to get a more specific error message. that 
could tell me atleast witch wrapper.parameter that is wrong and possible why 

If not it would be much appreciated if it might be possible in a later release.

I've got all log.channel=true ... atleast all I know about.


Thanks
Roland Carlsson


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RE: J 1.2 Applet wont run in browser

1999-05-31 Thread Tauren Mills

Not sure if it will help, but you can at least add Swing support to your
browser.  Take a look at this URL:
http://java.sun.com/products/jfc/tsc/web/applets/applets.html

Tauren

> -Original Message-
> From: Alexander F. Hartner [mailto:[EMAIL PROTECTED]]
> Sent: Sunday, May 30, 1999 1:06 PM
> To: '[EMAIL PROTECTED]'
> Subject: J 1.2 Applet wont run in browser
>
>
> I have been programming in Java 1.1.7 for a while now... and
> would like to upgrade to J1.2. I have been using Linux and
> Windows and it works great. So far I have not been able to run
> J1.2 applets in any browser on my Windows clients. Can anybody
> please help me to configure my code / browser to accept j1.2 applet.
>
> Sorry I know this is a little of the subject. I try not to do it again.
> Thanks
> Alex
>
>
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Re: 1.2 Certification info

1999-05-31 Thread Ken McNeil

--- Ozer Irfan <[EMAIL PROTECTED]> wrote:
> I search information about Java 1.2 certification
> exam.
> 
> Have you exam simulation applet ?
> Or documentation ?

If you are taking one of Sun's Java certification
exams, here is the main web page for all of Sun's
educational services http://suned.sun.com. From here
you can find information about each exam they offer.
This includes a list of material that you will be
expected to know if you wish to succeed on an exam.

Ken
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Re: [OT] Proposal: select(readfds, writefds, exceptfds)

1999-05-31 Thread Chris Abbey

[...suggestion to implement select in java snipped...]
>Can this be done, and if so:

Probably . . . certainly for the only platform we care about here ;)

> why has it not been done already?

Because it's platform dependent. Because no one has yet provided an
argument for it that was strong enough to warrent creating that
functionality on platforms which don't support it natively. -=Chris

!NEW!-=> <*> cabbey at home dot net  http://members.home.net/cabbey/ <*>
"What can Microsoft do? They certainly can't program around us." - Linus

-BEGIN GEEK CODE BLOCK-   Version:3.12   http://www.geekcode.com
GCS$/IT/PA$ d(-) s++:+ a-- C+++$ UL UA++$ P++ L++ E- W++ N+ o? K? !P
w---(+)$ O- M-- V-- Y+ PGP+ t--- 5++ X+ R tv b+ DI+++ D G e++ h(+) r@ y?
--END GEEK CODE BLOCK--


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jdk1.2 on RedHat-6.0

1999-05-31 Thread Edmund Mergl US/EA4 60/2/146 #44006


a fresh install of jdk1.2 on a RedHat 6.0 system gives the follwing error:


[mergl@sls7a3 mergl]$ javac

*** panic: GC: getStickySystemClass failed: java/lang/ref/Reference
CLASSPATH may be incorrect
SIGABRT   6*   abort (generated by abort(3) routine)
stackpointer=0xb220

Full thread dump Classic VM (Linux_JDK_1.2_pre-release-v1, native threads):
"main" (TID:0x40cf91e0, sys_thread_t:0x804c458, state:R, native ID:0x400) prio=5: 
pending=java.lang.OutOfMemoryError
Monitor Cache Dump:
Registered Monitor Dump:
utf8 hash table: 
JNI pinning lock: 
JNI global reference lock: 
BinClass lock: 
Class linking lock: 
System class loader lock: 
Code rewrite lock: 
Heap lock: 
Monitor cache lock: owner "main" (0x804c458) 1 entry
Thread queue lock: owner "main" (0x804c458) 1 entry
Dynamic loading lock: 
Monitor registry: owner "main" (0x804c458) 1 entry


There is no CLASSPATH set and the system has 98 MB physical 
memory and 48 MB swap.
According to top almost 60 MB are free.

Any help appreciated.

Edmund

-- 
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fon +49 711 821 44006  Lorenzstrasse 10
fax +49 711 821 42303  70435 Stuttgart
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Re: [OT] Proposal: select(readfds, writefds, exceptfds)

1999-05-31 Thread zun

On Mon, 31 May 1999, Bernhard Fastenrath wrote:

> Michael Sinz wrote:
[ snip ]
> > Second, Java has threads built in.  Why not use them?
> > One of the really nice parts of Java is that it has some
> > of these concepts, such as threads and synchronization
> > built in.  This is part of the language specification.
> > One should use those mechanisms.
> 
> Using a thread for each filedescriptor is a waste of
> resources. I really don't understand why there's no 
> mechanism similar to select() in Java.
> I might want to wait on several hundred sockets and
> assign the connection to a thread from a thread pool
> as soon as there's work to do.

In very large servers you hit a scaling problem in Java.  Most virtual
machines currently are limited to ~1000 threads per process.

Since each thread has stack space and context, it is resource intensive to
use threads.  Thread pools alleviate but do not eliminate the problem.

One big downside is that you have to tie up a thread to both incoming and
outgoing streams for fully asynchronous I/O.  That's two threads per
connection right there, a lot of overhead.

At least one company I know of has been forced to a custom JVM
(Hewlett-Packard's) in order to get acceptable performance out of a
Java-based server, and they basically made an interface to select(). 
I believe they've submitted a proposal to Sun also.  And according to
them, the Sun engineers are amenable to doing something about this.

. . . Sean.


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Re: 1.2 Certification info

1999-05-31 Thread Jeff Galyan

For information on the Sun Java Certification courses and exams, see
suned.sun.com.


--Jeff




Ozer Irfan wrote:
> 
> Hello,
> I search information about Java 1.2 certification exam.
> 
> Have you exam simulation applet ?
> Or documentation ?
> 
> Please send me.
> 
> Thanks.
> 
> Irfan
> 

-- 
Jeff Galyan
http://www.anamorphic.com
http://www.sun.com
jeffrey dot galyan at sun dot com
talisman at anamorphic dot com
Sun Certified Java(TM) Programmer
==
Linus Torvalds on Microsoft and software development:
"... if it's a hobby for me and a job for you, why are you doing such a
shoddy job of it?"

The views expressed herein do not necessarily reflect those of my
employer.

Sun Microsystems, Inc., has no connection to my involvement with the
Mozilla Organization.


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1.2 & threads

1999-05-31 Thread Christopher Seawood


I'm using the 1.2pre1 release on a RH6.0 system.  I started developing
this app that uses Swing under NT using Java Workshop 3.0 with Sun's 1.2
release. I tried running the app under Linux and it immediately exits.  I
don't explicitly create any threads in main() (just the main window) and
the program exits when main() does.  Obviously, this isn't the behavior
under NT.  Am I hitting some implementation-dependent feature of Java or
is one of the versions not adhering to the spec?

- cls



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Re: 1.2 & threads

1999-05-31 Thread Christopher Seawood


Oh, nevermind.  I found the known bugs page and this falls under the "AWT
programs exit immediately" problem.

- cls 


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Re: 1.2 & threads

1999-05-31 Thread Ken McNeil

--- Christopher Seawood <[EMAIL PROTECTED]> wrote:
> 
> I'm using the 1.2pre1 release on a RH6.0 system.  I
> started developing
> this app that uses Swing under NT using Java
> Workshop 3.0 with Sun's 1.2
> release. I tried running the app under Linux and it
> immediately exits.  I
> don't explicitly create any threads in main() (just
> the main window) and
> the program exits when main() does.  Obviously, this
> isn't the behavior
> under NT.  Am I hitting some
> implementation-dependent feature of Java or
> is one of the versions not adhering to the spec?

The rule is that the VM exits when there are no more
dameon threads running or the user calls
System.exit(int). The GUI thread is a dameon so if you
are running a GUI app the program will not exit at the
end of main (main starts dameon a thread that exits
when main does). So if you program starts no other
dameon threads and it exits at the end of main this
correct behavior.

Ken

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Re: 1.2 & threads

1999-05-31 Thread Moses DeJong

On Mon, 31 May 1999, Ken McNeil wrote:

> --- Christopher Seawood <[EMAIL PROTECTED]> wrote:
> > 
> > I'm using the 1.2pre1 release on a RH6.0 system.  I
> > started developing
> > this app that uses Swing under NT using Java
> > Workshop 3.0 with Sun's 1.2
> > release. I tried running the app under Linux and it
> > immediately exits.  I
> > don't explicitly create any threads in main() (just
> > the main window) and
> > the program exits when main() does.  Obviously, this
> > isn't the behavior
> > under NT.  Am I hitting some
> > implementation-dependent feature of Java or
> > is one of the versions not adhering to the spec?

I think you have that backwards. The VM should exit
when System.exit() is called or when there are no more
non-damon threads (if there is a non-daemon, don't exit).
The GUI thread should be a non-daemon thread in that
case. So if you create only daemon threads and you
do not create GUI widgets then your program would exit
when main() is finished.

later
mo dejong

> The rule is that the VM exits when there are no more
> dameon threads running or the user calls
> System.exit(int). The GUI thread is a dameon so if you
> are running a GUI app the program will not exit at the
> end of main (main starts dameon a thread that exits
> when main does). So if you program starts no other
> dameon threads and it exits at the end of main this
> correct behavior.
> 
> Ken
> 
> _
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> Get your free @yahoo.com address at http://mail.yahoo.com
> 
> 
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Re: Debug jserv.properties (correction)

1999-05-31 Thread Clayton Cottingham

roland,
i too was banging my head on this over the weekend!

of course my variable stack was high as i was dealing with apache as dso as well

well ...
long story shorter and relative to your needs is

the configure script {if you compile dso at least}
says

to use the example folder of the apachejserv package

by just including them in the httpd.conf!

so im my case
Include $where/ever/ApacheJServinstall/example/jserv.conf

after trying to build my own copy all day i stumbled across this!

yeesh


the ApacheJserv install docs are not very verbose about dso IMHO

but for those who need to know

./configure --with-dso --with-apxs --with-apache-autconf --with-apache-install=/usr 
{inmy case}

worked well for me


for those who need servlets up and running and dont care how check out jsdk 2.1 and 
unpack and hit startserver command
wow talk about start up time!




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Weird ClassFormatException probelm w/ JDK1.2 & RH6.0

1999-05-31 Thread Teemu Ropponen

Hi,

I'm getting a weird error on my RedHat 6.0 / JDK 1.2v1 (see below).

I'm not sure whether this is a JDK / RH / config / other error, and what
this could be related to. 

Please somebody help, if you've got a clue, because I don't !!

This same thing works OK w/ RH5.2 & JDK1.1.7 ... as well as in the Windows
environment...

Thanks,
Teemu Ropponen
Research assistant
Telecommunications Software and Multimedia Laboratory
Helsinki University of Technolgy
..
Setting the document base at
file:/mnt/cdrom/IMAGE/burn/Software/Demo/DemoX

>> java.lang.ClassFormatError: com/docuverse/dom/LiveNodeListImpl(Invalid
>> start_pc/length in local var table)

at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:403)

atjava.security.SecureClassLoader.defineClass(SecureClassLoader.java:10
1)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$1(URLClassLoader.java:216)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:280)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:275)
at java.lang.ClassLoader.loadClass(ClassLoader.java:237)
at
com.docuverse.dom.BasicDocument.getElementsByTagName(BasicDocument.ja
va:285)
at
fi.hut.tml.xsmiles.mlfc.smil.DocumentHandler.makeRegions(DocumentHand
ler.java:292)
at
fi.hut.tml.xsmiles.mlfc.smil.DocumentHandler.setDocument(DocumentHand
ler.java:163)
at
fi.hut.tml.xsmiles.mlfc.smil.SMILMLFC.display(SMILMLFC.java:158)
at
fi.hut.tml.xsmiles.MLFCManager.activatePrimaryMLFC(MLFCManager.java:9
8)
at fi.hut.tml.xsmiles.XMLDocument.run(XMLDocument.java:180)
at java.lang.Thread.run(Thread.java:479)


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Re: [OT] Proposal: select(readfds, writefds, exceptfds)

1999-05-31 Thread Michael Sinz

On Fri, 28 May 1999 14:19:03 +0200, Per Widerlund wrote:

>This is a general Java proposal, but here it is anyway:
>
>Handling I/O on several file descriptors can not be done
>efficiently without using multiple threads. Why not add
>a method to reach the select function of the underlying OS?

Why?  Java is platform independant and many (most) non-UNIX
platforms use other mechansims and, if they have a POSIX
layer, they emulate it only.

Second, Java has threads built in.  Why not use them?
One of the really nice parts of Java is that it has some
of these concepts, such as threads and synchronization
built in.  This is part of the language specification.
One should use those mechanisms.

You may find out that it ends up being easier since you
write your code to deal with one file and that one file
only and just get multiple objects or different classes
together to handle the whole combination.

Finally, it turns out that to implement the Java VM spec
without actual native threads (aka Green threads) the JVM
actually does this type of work for you internally.  In
fact, it hides all of the messyness and lets you worry
about the behavior you want rather than the mechanisms needed
to produce the results.


Michael Sinz -- Director of Research & Development, NextBus Inc.
mailto:[EMAIL PROTECTED] - http://www.nextbus.com
My place on the web ---> http://www.users.fast.net/~michael_sinz



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Re: Re: [OT] Proposal: select ..

1999-05-31 Thread Michael Sinz

On Mon, 31 May 1999 15:53:18 +0200, Per Widerlund wrote:

>Michael Sinz wrote:
>MS> Why?  Java is platform independant and many (most) non-UNIX
>MS> platforms use other mechansims and, if they have a POSIX
>MS> layer, they emulate it only.
>
>If that is the case, then there is nothing to do - Java must
>remain platform independent. I thought that something similar to
>select was available in all OS:es.

Not really.  Some OSes have a more general notification mechansism
that is not tied to file handles at all.  Some do not directly support
sync and async operations on the same file handle (you have to open
it specifically for the way you want to do the I/O - makes the POSIX
layer really tricky)

>MS> Second, Java has threads built in.  Why not use them?
>MS> One of the really nice parts of Java is that it has some
>MS> of these concepts, such as threads and synchronization
>MS> built in.  This is part of the language specification.
>MS> One should use those mechanisms.
>
>A thread uses lots of resources. I am not sure I buy your
>argument: threads are part of the specification and therefore
>we cannot change the specification..

Well, threads may or may not take large amounts of resources.
A JVM could have very light threading overhead.  On Linux, the
green threads are rather light but the native threads are rather
heavy.  This is a JVM and native platform issue, much like any
other performance, compatibility, and capability issue.  Some JVMs
will be better while others will be rather poor.  Some platforms
will also do better with JVMs and others will not.  (OS/2 seems to
do rather well with Java while some UNIX platforms are not too
good due to the quality of the native threading support.)

>MS> You may find out that it ends up being easier since you
>MS> write your code to deal with one file and that one file
>MS> only and just get multiple objects or different classes
>MS> together to handle the whole combination.
>
>Yes, it is indeed a simple and elegant way to handle things,
>but you waste a lot of precious resources. When you want to
>handle hundreds of socket connections and must start up two
>threads per connection you soon run into trouble.

Actually, with green threads in the JVM the thread overhead is
rather small.  Yes, it adds up but it may well be small enough
that you rather not have to deal with the complexities of other
forms.

Michael Sinz -- Director of Research & Development, NextBus Inc.
mailto:[EMAIL PROTECTED] - http://www.nextbus.com
My place on the web ---> http://www.users.fast.net/~michael_sinz



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Re: Re: [OT] Proposal: select ..

1999-05-31 Thread Per Widerlund

Michael Sinz wrote:
MS> Why?  Java is platform independant and many (most) non-UNIX
MS> platforms use other mechansims and, if they have a POSIX
MS> layer, they emulate it only.

If that is the case, then there is nothing to do - Java must
remain platform independent. I thought that something similar to
select was available in all OS:es.

MS> Second, Java has threads built in.  Why not use them?
MS> One of the really nice parts of Java is that it has some
MS> of these concepts, such as threads and synchronization
MS> built in.  This is part of the language specification.
MS> One should use those mechanisms.

A thread uses lots of resources. I am not sure I buy your
argument: threads are part of the specification and therefore
we cannot change the specification..

MS> You may find out that it ends up being easier since you
MS> write your code to deal with one file and that one file
MS> only and just get multiple objects or different classes
MS> together to handle the whole combination.

Yes, it is indeed a simple and elegant way to handle things,
but you waste a lot of precious resources. When you want to
handle hundreds of socket connections and must start up two
threads per connection you soon run into trouble.

//Per Widerlund


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memory usage of swing and 1.2

1999-05-31 Thread Devin Balkcom


Hi all,

I recently went through the painful process of getting 1.2pre1 to run
on my machine.  Although it works, the SimpleExample takes up ~30
megs, and about 35 seconds to load.  I experienced similar problems
with 1.1 and swing.  Is this normal?  A java -verbose seems to
indicate that _everything_ is being loaded into memory every time.
Is there a command line option, or is this something that will change
in future releases?  Please tell me the emporer is wearing clothing,

-Devin


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Re: [OT] Proposal: select(readfds, writefds, exceptfds)

1999-05-31 Thread Bernhard Fastenrath

Michael Sinz wrote:
> On Fri, 28 May 1999 14:19:03 +0200, Per Widerlund wrote:
> >This is a general Java proposal, but here it is anyway:
> >
> >Handling I/O on several file descriptors can not be done
> >efficiently without using multiple threads. Why not add
> >a method to reach the select function of the underlying OS?
> 
> Why?  Java is platform independant and many (most) non-UNIX
> platforms use other mechansims and, if they have a POSIX
> layer, they emulate it only.

Every OS I know has a mechanism like select(). Most of them
because they implement the BSD socket functions.

> Second, Java has threads built in.  Why not use them?
> One of the really nice parts of Java is that it has some
> of these concepts, such as threads and synchronization
> built in.  This is part of the language specification.
> One should use those mechanisms.

Using a thread for each filedescriptor is a waste of
resources. I really don't understand why there's no 
mechanism similar to select() in Java.
I might want to wait on several hundred sockets and
assign the connection to a thread from a thread pool
as soon as there's work to do.

-- 
 Bernhard Fastenrath   phone +49 228 55991-0 (fax-44)
 Gesellschaft fuer Digitale Sicherheit mbH,http://www.digital-security.com


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java 1.2 certification

1999-05-31 Thread OZER IRFAN

Hello,
I search information about Java 1.2 certification exam.

Have you exam simulation applet ?
Or documentation ?

Please send me.

Thanks.

Irfan


Get free e-mail and a permanent address at http://www.netaddress.com/?N=1


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Re: [OT] Proposal: select ..

1999-05-31 Thread Michael Emmel

Per Widerlund wrote:

> Michael Sinz wrote:



>
> MS> You may find out that it ends up being easier since you
> MS> write your code to deal with one file and that one file
> MS> only and just get multiple objects or different classes
> MS> together to handle the whole combination.
>
> Yes, it is indeed a simple and elegant way to handle things,
> but you waste a lot of precious resources. When you want to
> handle hundreds of socket connections and must start up two
> threads per connection you soon run into trouble.
>
> //Per Widerlund

I think you should learn about some of the thread pools avialable.
Java Worls www.javaworld.com hase and excellent article on thread
pooling.Instead of a select call it would probably be better for the
VMS to use native thread ppols internally instead of there current
design.

You could also emulate the select call if you wish using thread priorties.


Mike


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Re: jdk1.2 on RedHat-6.0

1999-05-31 Thread Emilian URSU




you don't read any mail from this list ?


set your DEFAULT_THREADS_FLAG=green
in your .java_wrapper
it seems that RH6.0 doesn't support native_threads





On Mon, 31 May 1999, Edmund Mergl US/EA4 60/2/146 #44006 wrote:

> 
> a fresh install of jdk1.2 on a RedHat 6.0 system gives the follwing error:
> 
> 
> [mergl@sls7a3 mergl]$ javac
> 
> *** panic: GC: getStickySystemClass failed: java/lang/ref/Reference
> CLASSPATH may be incorrect
> SIGABRT   6*   abort (generated by abort(3) routine)
> stackpointer=0xb220
> 
> Full thread dump Classic VM (Linux_JDK_1.2_pre-release-v1, native threads):
> "main" (TID:0x40cf91e0, sys_thread_t:0x804c458, state:R, native ID:0x400) 
>prio=5: pending=java.lang.OutOfMemoryError
> Monitor Cache Dump:
> Registered Monitor Dump:
> utf8 hash table: 
> JNI pinning lock: 
> JNI global reference lock: 
> BinClass lock: 
> Class linking lock: 
> System class loader lock: 
> Code rewrite lock: 
> Heap lock: 
> Monitor cache lock: owner "main" (0x804c458) 1 entry
> Thread queue lock: owner "main" (0x804c458) 1 entry
> Dynamic loading lock: 
> Monitor registry: owner "main" (0x804c458) 1 entry
> 
> 
> There is no CLASSPATH set and the system has 98 MB physical 
> memory and 48 MB swap.
> According to top almost 60 MB are free.
> 
> Any help appreciated.
> 
> Edmund
> 
> -- 
> Edmund Mergl   Alcatel SEL AG
> fon +49 711 821 44006  Lorenzstrasse 10
> fax +49 711 821 42303  70435 Stuttgart
> mailto:[EMAIL PROTECTED]  Germany
> 
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SV: Debug jserv.properties (correction)

1999-05-31 Thread Roland Carlsson

Thanks for the help

The problem tured out not to be in the configfile at all but was a result of a 
powerbreak witch left a file i a bad state So i removed the file and repaced it... 
and now it works just fine... 

But my request still remains It would help a lot if errormessages was a little 
more descriptive Witch file, witch parameter, witch servletzone. and so on... 

Thanks again
Roland Carlsson


-Ursprungligt meddelande-
Från: Clayton Cottingham <[EMAIL PROTECTED]>
Till: Roland Carlsson <[EMAIL PROTECTED]>
Kopia: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Datum: den 1 juni 1999 07:40
Ämne: Re: Debug jserv.properties (correction)


>roland,
>i too was banging my head on this over the weekend!
>
>of course my variable stack was high as i was dealing with apache as dso as well
>
>well ...
>long story shorter and relative to your needs is
>
>the configure script {if you compile dso at least}
>says
>
>to use the example folder of the apachejserv package
>
>by just including them in the httpd.conf!
>
>so im my case
>Include $where/ever/ApacheJServinstall/example/jserv.conf
>
>after trying to build my own copy all day i stumbled across this!
>
>yeesh
>
>
>the ApacheJserv install docs are not very verbose about dso IMHO
>
>but for those who need to know
>
>./configure --with-dso --with-apxs --with-apache-autconf --with-apache-install=/usr 
>{inmy case}
>
>worked well for me
>
>
>for those who need servlets up and running and dont care how check out jsdk 2.1 and 
>unpack and hit startserver command
>wow talk about start up time!
>
>


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