servlet and JavaBean .java files are to be compiled
and placed into:
\webapps\yourapp\WEB-INF\classes\
The engine will find necessary
classes if you made correct
entry into
\webapps\yourapp\WEB-INF\web.xml
(if not familiar with .xml -
just follow their examples
.jsp files are not to
user accidentally double clicks one of the
links and the same business object gets two requests, where the first isn't
finished before it recieves the second.
This probably better be intercepted, even if the logic is thread safe.
Too confusion to the client. You can watch user activity thread
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 20, 2001 12:04 AM
Subject: Re: multithreaded beans, struts, doing it right...
user accidentally double clicks one of the
links and the same business object gets two requests, where
2 possibilities here.
you ran out of memory in which case decrease number of connectors
in conf/server.xml for the context
Or there is a buglet in their ThreadPool program. I doubt this, primarily
because there haven't been many postings on this subject
r/luba
- Original Message -
Network programmers!
I also frequently get code=10053 error although not w/Tomcat.
I learned to work around it, but would be nice to know the origins
of this code.
thanks,
luba
- Original Message -
From: Venkatesh T [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001
Try this:
Driver driver =
(Driver) Class.forName("driver URL").newInstance();
if (driver == null)
{
System.out.println("no driver found");
}
- Original Message -
From: "Ryszard Lach" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 6:40 AM
Subject: Problem
Ooh! Shai is getting similar error. Although in his case he runs out of
memory.
But both of your errors occur in their ThreadPool program.
I wonder if threads are not being returned to the pool, in which case you
would need to report it as a bug.
Json, how many connectors did you configure for
It is .newInstance() that will actually create and instance of Driver class.
Also make sure your URL is correct.
- Original Message -
From: "Luba Powell" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 10:46 AM
Subject: Re: Problem with Postgresql JDBC drive
What are error messages? Can look in the log?
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 11:08 AM
Subject: installing tomkat under linux: please help!
I have RedHat 7.1
I download file jakarta-tomcat-3.2.1.tar which create the
but a real mess of a database
You are right here. Because of it I stopped using Entity beans all
together...
- Original Message -
From: Sam Newman [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 9:26 AM
Subject: Re: What are EJB
The only real similarity
you need to add the shutdown-hooks permission
Yes, this too. You can either update policy file directly or via
GUI jdk1.3\bin\policytool
you need to add the
shutdown-hooks permission.
- Original Message -
From: "David Wall" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June
.
sam
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 5:31 PM
Subject: Re: What are EJB
You think so? I will give in another chance.
Can you send to me configurations for Tomcat/EJB?
thank you.
Thank you !
- Original Message -
From: Boris Niyazov [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 5:53 PM
Subject: Re: How can I make tomcat to instantiate a class
We use a database connection pool class which is a servlet that we start
on
tomcat boot using
Derek:
Why don't you try and let us know.
Change TOMCAT_HOME to point to jdk1.1 or jdk1.2.
Place earlier release of JSDK: servlet.jar under
\common\lib\
Let us know if this works.
- Original Message -
From: Derek Doerr [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent:
Hello Dmitri--
- you cant expect it to automatically migrate old objects to new versions
of the same type.
My understanding is that dynamically loaded Class definition are subject to
gc just like
regular objects. For this to happen Class definition has to be nullified.
For this to happen
the
David:
There is a global entry:
!-- Global logger unless overridden at lower
levels -- Logger
className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log."
suffix=".txt"
timestamp="true"/
Are yousaying that this doesn't
work?
- Original Message -
From:
David
. Right now there
are three standard log
streams, "tc_log", "servlet_log",
and "JASPER_LOG".
- Original Message -----
From:
Luba
Powell
To: [EMAIL PROTECTED]
Sent: Sunday, June 17, 2001 8:50 AM
Subject: Re: access log for Tomcat
Da
before I go any further, I'm assuming that if I'm saying something that
isn't right someone
Not to worry - we are all techies...
I thought, and I want someone to correct me here if I'm wrong, that
Classloaders dont unload class definitions. The reasoning behind this
is to prevent some
Not a problem. Here it is.
Essential DOS Commands and Concepts
Backup Files
Change the Default Drive
CHDIR (CD) Change Directory Command
COPY Command
DIR (Directory) Command
ERASE Command
File-Naming Conventions
FORMAT Command
MKDIR (MD) Make Directory Command
Rebooting the computer
One more thing:
The reasoning behind this is to prevent some malicious program from
replacing
a class definition with their own
This is generally correct. Although - there is a way to tell (if one is bold
enough
to extend ClassLoader properties) which ClassLoader this or that
ClassDefinition
-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Sunday, June 17, 2001 9:07 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: newbie: Sample autoexec.bat, pls?
Not a problem. ... .
If you do:
java -X
you will see all extended options. Xms and Xmx are for heap.
The only way that I know how to set stack size is in JVM Assembler.
It is normally done in the method:
.method
.limit stack 3
.limit locals 4
After all each thread must have it's own stack. So I
Also,
lookup up java.util.Stack. It contains some limited
stack manipulation methods.
R/luba
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, June 17, 2001 11:59 AM
Subject: Re: Xss
If you do:
java -X
you will see all extended
Sorry, Shai:
is 10x some new option?
R/luba
- Original Message -
From: Shai Deljo [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, June 17, 2001 12:37 PM
Subject: RE: Xss
10x
-Original Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Sunday, June 17, 2001
what is the deafult stack size in
Java(TM) 2 SDK, Standard Edition
Version 1.3.0 for Linux ??
+ i tested the Xss before and it didn't seem to work ?!
Shai
-Original Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Sunday
SDK, Standard Edition
Version 1.3.0 for Linux ??
+ i tested the Xss before and it didn't seem to work ?!
Shai
-Original Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Sunday, June 17, 2001 6:59 PM
To: [EMAIL PROTECTED]
Subject: Re: Xss
putting Tomcat in your message was smart. this way we won't get in
trouble with our colleagues.
From were I stand the only thing that EJB and JavaBeans have in
common is the presence of bean work in the name.
I am sure that you know what is the advantage of JavaBeans since
you wrote some. EJB
Hello, Itsvan--
I think there is a bug in their Class loaders, or the strategy has not been
thought out thru. There have been numerous postings on this subject.
But I guess nothing will happen unless the community start to document
and report those bugs instead of working around them, of which I
- Original Message -
From: istvan bereti [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, June 18, 2001 1:18 AM
Subject: RE: session error after recompile a java classBUG?
Well I put it as Serializable the object bound to session. It was a GOOD
point but even this did not
Ok. This is my 2 cents. Jini works predictably, save for Remote Exception.
Obvious reason - network is inherently unreliable. See if you are more
comfortable with this API, meaning not that you don't know better, but that
it suites you precision requirement better. It seems that you are more
Note: Jini API although can do more - is not for the faint of heart.
One has to do lot of configuration work with little to none samples.
But for the demanding audience - this will be a solution to the
ClassLoader woes.
r/luba
- Original Message -
From: Luba Powell [EMAIL PROTECTED
?
Well I stop here... I restart TOMCAT...
THX
-Original Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Sunday, June 17, 2001 12:30 PM
To: [EMAIL PROTECTED]
Subject: Re: session error after recompile a java classBUG?
Note: Jini API although can do more
bean work in the name
Correction. *bean* word (not work)
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Sunday, June 17, 2001 1:17 PM
Subject: Re: What are EJB
putting Tomcat in your message was smart. this way we won't get in
trouble with our
Venkatesh--
This message is generated by Tomcat ServletWrapper
program.
It is trying to load the servlet, but finds that
it's class (note: Class not same
as Object) is NULL.
I sincerely doubt that there is a bug in their
program - I would start looking
at your CLASSPATH and other ENV
it is the command i used to start the tomcat.
the following
Using classpath:
/user/staff/wapteam/tomcat=/lib/*:/user/staff/wapteam/tomcat/./tomcat.sh:
usr/java1.2=/bin/java: not found
is the error message.
any help ?
thanks
- Original Message -
From:
Luba
It is actually a flaw
class
loading. Every time a class is recompiled it generates a new id based on
the class loading
Mike, would you recommend to use our own ClassLoaders until this
problem is fixed. Does it exist in version 4?
R/Luba
- Original Message -
From: Michael Wentzel
Although, I don't work with IIS - I noticed there wer lots of posting on
the subject of your interest.
If you go to:http://www.mail-archive.com/tomcat-user@jakarta.apache.org/
and search on IIS, filters, etc.
I am sure you can find something to begin with...
- Original Message -
To quick-test your servlet - put it under \webapps\examples\WEB-INF\classes\
while html will go under \webapps\examples\servlets\
Update webapps\examples\WEB-INF\web.xml with you servlet entry -
the same way the examples do.
Use URL similar to what they have on the example page.
R/Luba
-
Jason:
Scott Tatum has a page on virtual hosting. I think it is very informative.
http://www.worldcom.com/main.phtml?grph=1
I am not sure if he still can be reached at:
[EMAIL PROTECTED]
These are the subjects that he addressed at one time:
1. Introduction
2. Virtual Hosting Options
2.1
Thank you. I'll try it on Monday.
- Original Message -
From: Bo Xu [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, June 16, 2001 5:57 PM
Subject: about auto-reloading of TC4.0-b5
Hi :-)
* I use the foolowing symbol to try to explain my question :-)
MyServlet(0): a
-example : Apache-static
configuration-example : per-context JVM : 1
configuration-example : per-context JVM : 2
configuration-example : VHosts
Hope this page will help.
R/Luba
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; Jason Koeninger [EMAIL
Hello, Jeremy:
If you are familiar with servlets - there isn't much more to know about JSP.
JSP is a short-hand for generating servlets. Just few tags to learn.
The advantage of writing JSP tags is that (in our case) apache programs:
parser, compilers, loaders parse these tags, generate servlets,
Correction: tomcat (not apache) programs..
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, June 16, 2001 9:51 PM
Subject: Re: jsp help
Hello, Jeremy:
If you are familiar with servlets - there isn't much more to know about
JSP.
JSP
Look under logs directory for more messages.
- Original Message -
From: LeRoi [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 5:11 AM
Subject: FW: newbie: Starting Tomcat
Hello,
I'm new to java and was coming to grips with it until I got to the
chapter on
Doesn't look that tomcat is running
- Original Message -
From:
Christoph Brunner
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 9:48 AM
Subject: tomcat work with mozilla but not
with IE
Hi,
I had installed Tomcat as a stand-alone servlet container!
Go to DOS prompt and type:
policytool
This will guide you thru the syntax
- Original Message -
From: Pernica, Jan [EMAIL PROTECTED]
To: Tomcat-User (E-mail) [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 1:17 AM
Subject: Running secure tomcat
If I run tomcat 4.0b5 in the secure more
Put:
System.out.println(System.getSecurityManager()) into your program.
Let us know what it says.
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 11:20 AM
Subject: IllegalAccessError when run from Tomcat
When running a servlet from within
Could it be that those packages have incompatible classes:
jakarta-tomcat-4.0-b5.zipjakarta-servletapi-4.0-b5.zip
Why do you need jakarta-servletapi? tomcat supports servlets.
- Original Message -
From: Marc-andre Thibodeau [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday,
!
Thanks a lot!
MA
Luba Powell wrote:
Could it be that those packages have incompatible classes:
jakarta-tomcat-4.0-b5.zipjakarta-servletapi-4.0-b5.zip
Why do you need jakarta-servletapi? tomcat supports servlets.
- Original Message -
From: Marc-andre Thibodeau
Look at tomcat example, dude:
.
http://localhost:8080/example/servlets/index.html
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 2:13 PM
Subject: executing the servlet
What do I put in the url to execute a servlet on a localhost machine.
leave it there. otherwise you would need to make an entry for your
own app. just learn what they are doing first.
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 2:47 PM
Subject: web.xml
Hi, in the directory ~webapps\examples\Web-inf
What is the error message you are getting?
- Original Message -
From: cathy moffatt [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 4:09 PM
Subject: RE: Default web.xml
After much difficulty I did manage to get Tomcat3.2.2 to run servlets
jsp,
but only with
Cool question.
JSP like a servlet has to have an entry. Luckily we don't have to worry
about it since tomcat's JspC.java program not only dynamically
creates the context but also loads the generated servlet.
if (servletout != null) {
I have some wierd conflict between different versions of classes with the
same name?
It seems that way. This is linkage error, meaning, it went thru compiler
fine, but at run time the field definition changed.
R/Luba
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sometimes I get weird message:
The original message was received at Fri, 15 Jun 2001 13:35:56 -0700 (PDT)
from localhost [127.0.0.1]
Does anyone else receiving these?
Why are you pointing to Enterprise version of JDK:
$JAVA_HOME /usr/j2se
shouldn't it be /usr/jdk1.3?
- Original Message -
From: Baker, Gary [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 4:33 PM
Subject: JSP Examples Error 500
Hi,
I've installed tomcat
tomcat.sh start logfile 21
- Original Message -
From: Gary Rather [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, June 15, 2001 4:58 PM
Subject: jvm.stder jvm.stdout
I am running tomcat on a solaris box.
Everything seems to be working correctly but I do not get a jvm.stderr or
Tim-- ([EMAIL PROTECTED])
I hope that WebDav doesn't mind if we learn
something from you.
If some of us is on the wrong track - please
correct and point
to the right direction.
Thanks in advance for your constructive
input.
On 1.
Invoke servlet will go where you tell it to go.
Examine URL-PATTERN under \conf\web.xml:
!-- The mapping for the invoker servlet --
!-- Comment this out if you do not want invoker service --
servlet-mapping
servlet-nameinvoker/servlet-name
url-pattern/servlet/*/url-pattern
window for tomcat does not remain open. I
assume this means that tomcat does not keep running.
I think there is an error in the script.
Try this:
if you are
running tomcat4 - do:
\bin\catalina
start
if tomcat3 -
do:
\bin\tomcat
start
Examine logs. Make sure ENV Variables are
Sounds like a pilot error. Works fine:
%
session.setAttribute(request,request);
session.getAttribute(request);
out.println(request: + request);
%
Outputs:
request: org.apache.catalina.connector.HttpRequestFacade@649dcd
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL
Here is the example that works:
html
body
center
%@ page import=java.util.*, java.io.* %
%
Properties props = (Properties) application.getAttribute(PROPERTIES);
if (props == null)
{
props = new Properties();
props.load(new
Sorry - send you the wrong example. replacd file name with the complete
path. Don't forget to flush.
- Original Message -
From: Foo Shi Hao [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 8:45 AM
Subject: Using JSP to Save file
Hey all~!
Got something to ask.
Any suggestions on the best way to hook JSP and
Jini?
Thanks.
From:
TOMCAT_HOME\bin
type:
tomcat start
- Original Message -
From:
Prasad
Medepalli
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: Wednesday, June 13, 2001 11:02
PM
Subject: installation of tomcat on
windows 98
Hi,
I downloaded JDK 1.3 and
JSP will do it for you. Example:
html
body
%@ page language=java %
%@ page import=javabean.Counter %
!-- page, request, session, application --
jsp:useBean id=counter scope=page class=javabean.Counter /
%
out.println(Count from scriplet = + counter.getCount());
%
br
Count from
HttpServlet is not thread safe. Synchronize your code where needed
- Original Message -
From: Sebastian Schulz [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 11:08 AM
Subject: MultiThreadModel-Problem?
hi,
i use a servlet in MultiThreadModel-mode (default).
Stupid question on my part, but you certainly called
super.init(config)?
- Original Message -
From: Zsolt Koppany [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 10:28 AM
Subject: Bug or feature
Hi,
I want a servlet executed when tomcat is started, thus I
Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 14, 2001 8:20 AM
To: [EMAIL PROTECTED]
Subject: Re: MultiThreadModel-Problem?
HttpServlet is not thread safe. Synchronize your code where needed
- Original Message -
From: Sebastian Schulz [EMAIL
\conf\server.xml
For each connector:
!-- Define a non-SSL HTTP/1.1 Connector on port
8080 -- Connector
className="org.apache.catalina.connector.http.HttpConnector"
port="8080" minProcessors="5"
maxProcessors="75"
enableLookups="true"
redirectPort="8443"
acceptCount="10" debug="0"
OK to use, but only in certain context:
protected Map clientList = Collections.synchronizedMap( new HashMap());
Notice the reference to the static method...
- Original Message -
From: Bo Xu [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 1:11 PM
Subject: Re:
tomcat stop should work fine if the tomcat.bat is working correctly.
It just executes org.apache.tomcat.startup.Tomcat -stop program
that hopefully does everything gracefully and then resets ENV variables
- Original Message -
From: Tim O'Neil [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Popup windows are best left to JavaScript. I suppose one
could create JavaScript code via out.println within % tag ,
but too much work for nothing.
R/L
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 1:07 PM
Subject: Forwarding JSP and
Not to worry.
The only time that I know you need to set objects to null
is when you write servers and inside you (while (true)..
eternal loop.
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 1:41 PM
Subject: memory allocation
hi all , i
This is what I suggest you do:
Create Gateway class (login class) that metes out Session
objects to callers via getMySession() method.
Inside this method I would deserialize the bean object from the file and
added it as an attribute inside the session.
It is a common
Under Tomcat4 they are in:
CATALINA_HOME\webapps\examples\jsp\
I surpose that under Tomcat3 there would be in the same directory
but under TOMCAT_HOME...
- Original Message -
From: kevin ritter [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 2:46 PM
Subject: Re:
My understanding is that JSP:FORWARD is translated by into
pageContext.forward(String url, String parm)
So it is just a JSP specific implementation of javax.servlet.ServletContext
interface that provides javax.servlet.RequestDispatcher where you can
imlement forward(ServletRequest req,
To avoid confusion - let's step thru \bin\tomcat.bat script:
bin\tomcat.bat stop
if %1 == start goto startServer
..
:stopServer
rem Stopping the Tomcat Server
%_RUNJAVA% %TOMCAT_OPTS% -Dtomcat.home=%TOMCAT_HOME%
org.apache.tomcat.startup.Tomcat -stop %2 %3 %4 %5 %6 %7 %8 %9
... where
org.apache.tomcat.startup.Tomcat is a program
... that actually executes shutdown or calls another java program
goto cleanup
.
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 4:42 PM
Subject: Re: Graceful Shutdown
To avoid confusion - let's step thru
This is OK. But I surpose that the writer wanted to create session specific
JavaBean.
He probably wants to make it a plug-n-play object that servlet tends not to
be.
Further, to make it session specific - that is preserving session data
integrity in the
multi-threaded environment - he might
I apologize but I earlier deleted the message that
contained the
message that one doesn't have to ever ever
setlocal variables to
null...
Well, it is almost true. In the "for ever"
loop (in servers) large arrays
are referenced until method returns. When the
method does not
return - it
This awfully good...
- Original Message -
From: Bo Xu [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 14, 2001 5:15 PM
Subject: Re: How can I make tomcat to instantiate a class
...But actually my problem was to instantiate a class when
tomcat boots up...so that i can
My apology for posting it twice.
Did anyone got the mechanics to fuse JSP and
JINI?
If yes - please send some code and configuration
files.
No point to reinvent the wheel...
R/L
This is where you start. Under \conf\server.xml
find
!-- Tomcat Examples Context --
Context path=/examples docBase=examples debug=2
bumpup debug level to 99 or higher than 2.
Then examine your logs.
- Original Message -
From: Marc-andre Thibodeau [EMAIL PROTECTED]
To:
Bump up the LogLevel to DEBUG in httpd.conf file
and
look in the log for detail messages
- Original Message -
From:
Amos Shapira
To: '[EMAIL PROTECTED]'
Sent: Wednesday, June 13, 2001 4:58
AM
Subject: RE: Tomcat hangs if I refer to a
context that doesn't
What do I need to do to have Tomcat4 automatically
reload JSP pages
that contain beans and other classes.
Right now I am just deleting stuff from work
directory, thus forcing
recompilation. There must be a better
way.
And I dutifully put reload flag into server.xml
file:
Context
Someone had this problem earlier today. As in NoClassDefError
NoSuchMethodError occurs at link time.
In earlier case it was incorrect or overshadowed path. May be that
person will be more specific as which environment variable was
causing the loss of reference to the class
- Original
Randy--
Will System.exit(0) inside the servlet crash the JVM?
- Original Message -
From: Randy Layman [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 13, 2001 4:42 PM
Subject: RE: Tomcat as Service Crashing.
I don't think that this is the problem that is typically found
Yap! As sad as it is - I could crash THE JVM started by Tomcat
by merely putting System.exit(-9) in my servlet.
How can webmasters protect themselves from such code?
- Original Message -
From: Luba Powell [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 13, 2001 5:27 PM
Yes, o'course in production. In my mind - there is no place for this
method in HttpServlet - it should throw the Exception. OK for
GenericServlet, but this is Javasoft problem.
R
- Original Message -
From: David Wall [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 13,
What you say - is all correct. But some basic security policy protecting
the integrity of the JVM could be embedded as part of tomcat distribution.
Because how many questions are we getting on the system - JVM
unexpectedly crash. And in real life many companies *should*
but really *do* have one
Attached is JDBC/ODBC code.
- Original Message -
From: Marcel [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Tuesday, June 12, 2001 9:41 AM
Subject: Need some info about jsp/jscript
Ok, tomcat works!
Cool.
Now i want to do some jsp and jscript programming.
Do i need a book? Or
Did somebody ask for JDBC/ODBC JSP sample?
I sent it earlier, but the mail bounced back because
.jsp type attachments not allowed!
:)
html
titleSelect SQL JSP/title
body
center
%@ page language=java import=java.sql.* %
%
Connection con = null;
no /description tag
terminator:
display-name/display-name
description
servlet
servlet-nameControllerServlet/servlet-name
display-nameCentralServlet/display-name
servlet-classControllerServlet/servlet-class
/servlet
- Original Message -
From:
Vernon Wu
To:
Yes. Monitor lock need to be put on code (preferred) or method wherever they
care accessed by more than one thread.
Example:
static void doSort (int [] arr)
{
..
synchronized(arr)
{
// sensitive code
}
}
.method static doSort([I)V
aload_0
monitorenter
;
Actually the outcome is predictable:
monitorenter will obtain objectref on this (aload_0)
* if no other thread has locked the object
* if the object is currently locked by another thread (monitorenter
instruction)
* if the current thread already owns a lock - the lock is released when the
counter
You are right. In one case the outcome between native and classic
implementation on locking the class can be different, specifically:
in classic model there is a so tiny chance of missed notification of
monitorenter since it takes dy/dx time to transfer from the wait to
the ready queue. In all
that, but is that all that
is needed to synchronize something?
Brandon
-Original Message-
From: Luba Powell [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, June 12, 2001 1:52 PM
To: [EMAIL PROTECTED]
Subject: Re: Java Question
Actually the outcome is predictable:
monitorenter
Title: RE: static,synchronized and classloaders(was:Java Question)
If your context points to another virtual machine -
yes.
On the same virtual machine static is
static
- Original Message -
From:
Cox, Charlie
To: '[EMAIL PROTECTED]'
Sent: Tuesday, June 12, 2001
Title: RE: static,synchronized and classloaders(was:Java Question)
Also, look ifidentical files are generated
based on 2 different context:
abc.MyClass is not the same as xyx.MyClass.
If 2 class loaders
load from identical class files - JVM verifier
should throw the exception
before a
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