date:20081211

As a heretic post in this forum, which usually tends to recommend the 
opposite :
what about putting an Apache with mod_cache in front of your Tomcat 
server ?  Carefully set up, that would do what you want.



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HTTP 400 Error when trying to check Tomcat installation

Hi Folks,

After installing Tomcat and trying to check that it is working OK, I get the
HTTP 400 error message.

I am running Windows XP Professional version 2002 SP 3 with all updates
applied.
I am running Internet Explorer v 7.0.5730.11.
I have installed Java JDK 1.6.0_11 with the JRE from the same download.
I installed Tomcat 6.x Core from its zip into C:\tomcat.
I set the environment variable JAVA_HOME to point to the JDK 1.6.0_11
directory
(C:\Program Files\Java\jdk1.6.0_11).
The JRE is installed at C:\Program Files\Java\Jre6.
I copied the servlet-api.jar to the JDK directory\jre\lib\ext.
I edited the c:\tomcat\conf\context.xml file to have Context
reloadable=true.
I edited the c:\tomcat\conf\web.exl file to un-comment the invoker entrie
for servlet and servlet_mappings.
I checked all these by loading the files into IE and the entries were
exactly as described in the tomcat documentation.
I created the classes sub directory as
c:\tomcat\webapps\ROOT\WEB-INF\classes.

Prior to doing all the above, I had cleaned my system by removing all
previous version of Java and tomcat. I also ran Norton 360 Registry cleanup
to try to make sure that there were no random or odd registry entries. I
hard rebooted the PC and then started the Java and tomcat installations.

When I start up tomcat in the command window, it appears to be successfully
loaded reporting that it is using port 8080.

All of the above is standard and in line with the documentation.

BUT

when I try to test the installation using the examples that come with tomcat
using the URL http://localhost:8080/ I get the HTTP 400 Bad Request message.

This tells me that IE was able to connect to the web server but the web page
could not be found because of a problem with the address.

I have tried loading my servlet into the tomcat classes directory but get
the same message.

I have tried adding various tomcat directories to the URL (e.g. examples)
but get the same message.

If I stop tomcat and try the URL, I get a different IE error that recognises
that there is no web server running. I did this to check whether I had
another webserver also running in the background.

The Tomcat documentation on trouble shooting does not mention this error and
clearly states that there are only 3 things that can go wrong with the
installation:

1. Port 8080 is being used by another process, in which case Yomcat won't
start.
2. An Out of Environment Space error that affects Windows 95, 98 and ME.
3. The localhost isn't found because one is behind a proxy.

None of these would seem to apply to my situation.

Can anyone, please, provide some insight into how I can overcome this
problem.

Ta much best regards,

Pete

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Re: HTTP 400 Error when trying to check Tomcat installation

2008-12-11 Thread Kees de Kooter

Did you try to access the manager application at
http://localhost:8080/manager/html?

If that works your tomcat is running fine.

I suggest you read up on building and packaging java web applications.
You can deploy your .war files using this manager application.

On Thu, Dec 11, 2008 at 11:51, BoyePeter
[EMAIL PROTECTED] wrote:

Hi Folks,

After installing Tomcat and trying to check that it is working OK, I get the
HTTP 400 error message.

When I start up tomcat in the command window, it appears to be successfully
loaded reporting that it is using port 8080.

All of the above is standard and in line with the documentation.

BUT

when I try to test the installation using the examples that come with tomcat
using the URL http://localhost:8080/ I get the HTTP 400 Bad Request message.

This tells me that IE was able to connect to the web server but the web page
could not be found because of a problem with the address.

I have tried loading my servlet into the tomcat classes directory but get
the same message.

I have tried adding various tomcat directories to the URL (e.g. examples)
but get the same message.

If I stop tomcat and try the URL, I get a different IE error that recognises
that there is no web server running. I did this to check whether I had
another webserver also running in the background.

The Tomcat documentation on trouble shooting does not mention this error and
clearly states that there are only 3 things that can go wrong with the
installation:

None of these would seem to apply to my situation.

Can anyone, please, provide some insight into how I can overcome this
problem.

Ta much best regards,

Pete

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RE: Tomcat caching of static resources?


Thanks Chuck for that. Perhaps my use of words was a little misleading. I
guess what i was trying to say was that the response returned by Tomcat i.e
expiry date etc was not conductive to caching for clients. In terms of
headers, i dont want to cache 'pages as the data is very transient. What i
did want however was for Tomcat to serve the static resources with a header
that doesn't expire in 1970. The line 'can Tomcat cache resources' was i
guess trying to establish if Tomcat could treat them in a similar way to
Resin, in that you can specify in the web.xml elements to provide the kind
of solution i'm looking for but yes, ultimately it affects what header
information is 'stamped' on the response.

 What are you doing to control the headers?  What headers are being used
 for the large .js files?

Nothing, this is perhaps my problem, i (or at least think) know how to
specify headers on a page level but when it comes to specifying on static
resources i'm not sure how this all fits in?

 i cant believe there isn't a standard Tomcat configuration for this?

For what?  Caching static resources on the server end doesn't alter the
amount of network traffic generated.

Sorry, 'cant believe' is perhaps a little strong, born from end of day
frustrations :) I'll rephrase'it would be nice :), if i could specify
header expiry on a static asset similar to the way Resin does. Now, maybe
this comment still doesn't make sense so i'll step back a little. I have a
dynamic website, that uses a lot of javascript js files which seem to be
downloaded for every page call, i'd like this to stop :D.

Thanks again for your response, its certainly helping me focus the problem
:)






Caldarale, Charles R wrote:
 
 From: David Smith [mailto:[EMAIL PROTECTED]
 Subject: Tomcat caching of static resources?

 is it possible to cache static images and .js files in Tomcat?
 
 Think about what you just asked for: how would caching static resources in
 the server avoid them being downloaded by the browser?  It's the browser
 that must cache the information to avoid the redundant downloads.
 
 When i look at the browser cache it looks like the browser
 is downloading all page assets for every call, including some
 very large .js files.
 
 As stated in one of the (correct) responses to the article you referenced:
 
 So the first thing is to get control of the cache headers. Without them,
 the cache can not know what to do.
 
 What are you doing to control the headers?  What headers are being used
 for the large .js files?
 
 but the solution didn't resolve the problem (especially if
 deploying via war files)
 
 The original author of the article is clearly unfamiliar with Tomcat,
 caching, and security (e.g., not knowing where a context.xml file goes,
 and erroneously stating it doesn't work with a .war file).
 
 i cant believe there isn't a standard Tomcat configuration for this?
 
 For what?  Caching static resources on the server end doesn't alter the
 amount of network traffic generated.
 
  - Chuck
 
 
 THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
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 received this in error, please contact the sender and delete the e-mail
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Re: Tomcat caching of static resources?

2008-12-11 Thread Gregor Schneider

Bill,

On Thu, Dec 11, 2008 at 4:15 AM, Bill Barker [EMAIL PROTECTED] wrote:

 The article is referring to the fact that Tomcat adds cache headers by
 default to any page protected by a security-constraint to prevent someone
 else from stealing it from an intermediate proxy.  The default settings are
 extremely aggressive, resulting in regular posts on this list of the form
 My secured pdf file can't be displayed in IE.

If you read on in those articles, you'll find that this is not a
problem due to headers send by Tomcat but due to a bug with the
SSL-implementation in IE

http://support.microsoft.com/?scid=kb%3Ben-us%3B323308x=11y=11

There are some workarounds for this problem (if you don't want users
to patch their registry), which require a modification of the headers
being sent, however, I believe you're mixing up the cause of this
problem (= bug in IE) with a possible workaround (header-modification
by Tomcat).

Cheers

Gregor
-- 
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gpgp-fp: 79A84FA526807026795E4209D3B3FE028B3170B2
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Re: Tomcat caching of static resources?


I agree that i dont think the 'in memory' Tomcat solutions is what i'm
currently after, its very much a Tomcat 'heading stamp' issue i think.
Interesting point you raise though regarding pushing the statics to an
external server. Not ideal from a deployment perspective but that would
certainly solve it :). Interesting points you raise too regarding the
reasoning behind the 'default expiry' date, makes a lot of sense but just a
little frustrating for simple static page assets.


Bill Barker-2 wrote:
 
 
 Caldarale, Charles R [EMAIL PROTECTED] wrote in message 
 news:[EMAIL PROTECTED]
 From: David Smith [mailto:[EMAIL PROTECTED]
 Subject: Tomcat caching of static resources?

 is it possible to cache static images and .js files in Tomcat?

Think about what you just asked for: how would caching static resources in 
the server avoid them being downloaded by the browser?  It's the browser 
that must cache the information to avoid the redundant downloads.

 There are settings in Tomcat that control server-side caching of static 
 resources (i.e. Tomcat serves up an in-memory copy of frequently requested 
 static resources).  I really can't recommend this for large .js files on
 a 
 production server however.  If you must do this, check out the Tomcat docs 
 for configuring a Resources .../ element.  However, the OP is probably 
 better off enabling the sendfile options on either the NIO or APR
 Connector.
 
 When i look at the browser cache it looks like the browser
 is downloading all page assets for every call, including some
 very large .js files.

As stated in one of the (correct) responses to the article you referenced:

So the first thing is to get control of the cache headers. Without them, 
the cache can not know what to do.

What are you doing to control the headers?  What headers are being used
for 
the large .js files?

 The article is referring to the fact that Tomcat adds cache headers by 
 default to any page protected by a security-constraint to prevent
 someone 
 else from stealing it from an intermediate proxy.  The default settings
 are 
 extremely aggressive, resulting in regular posts on this list of the form 
 My secured pdf file can't be displayed in IE.  If the article applies to 
 the OP, it may just be easier to move the .js files to a non-secured 
 location.  If you take the advice in the article, then you are telling 
 Tomcat that the webapp programmer is taking full control of the cache 
 headers, so you are on your own in terms of security.
 
 
 but the solution didn't resolve the problem (especially if
 deploying via war files)

The original author of the article is clearly unfamiliar with Tomcat, 
caching, and security (e.g., not knowing where a context.xml file goes, 
and erroneously stating it doesn't work with a .war file).

 i cant believe there isn't a standard Tomcat configuration for this?

For what?  Caching static resources on the server end doesn't alter the 
amount of network traffic generated.

- Chuck


THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY 
MATERIAL and is thus for use only by the intended recipient. If you 
received this in error, please contact the sender and delete the e-mail 
and its attachments from all computers. 
 
 
 
 
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Re: Tomcat caching of static resources?


The problem however is that i'm using a remote shared host. Whilst this gives
me quite a lot of configuration potential i doubt it would allow me to setup
Apache and adaptors etc. In a 'real production environment' this would very
much be a preferred choice.


awarnier wrote:
 
 As a heretic post in this forum, which usually tends to recommend the 
 opposite :
 what about putting an Apache with mod_cache in front of your Tomcat 
 server ?  Carefully set up, that would do what you want.
 
 
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Re: Tomcat caching of static resources?


same applies on Firefox though, there may well be issues in IE as always but
i'm not convinced this is the core problem here.



Gregor Schneider wrote:
 
 Bill,
 
 On Thu, Dec 11, 2008 at 4:15 AM, Bill Barker [EMAIL PROTECTED] wrote:

 The article is referring to the fact that Tomcat adds cache headers by
 default to any page protected by a security-constraint to prevent
 someone
 else from stealing it from an intermediate proxy.  The default settings
 are
 extremely aggressive, resulting in regular posts on this list of the form
 My secured pdf file can't be displayed in IE.
 
 If you read on in those articles, you'll find that this is not a
 problem due to headers send by Tomcat but due to a bug with the
 SSL-implementation in IE
 
 http://support.microsoft.com/?scid=kb%3Ben-us%3B323308x=11y=11
 
 There are some workarounds for this problem (if you don't want users
 to patch their registry), which require a modification of the headers
 being sent, however, I believe you're mixing up the cause of this
 problem (= bug in IE) with a possible workaround (header-modification
 by Tomcat).
 
 Cheers
 
 Gregor
 -- 
 just because your paranoid, doesn't mean they're not after you...
 gpgp-fp: 79A84FA526807026795E4209D3B3FE028B3170B2
 gpgp-key available @ http://pgpkeys.pca.dfn.de:11371
 
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Re: HTTP 400 Error when trying to check Tomcat installation

Hi,

Thanks for the reply and have just tried your suggestion.

A dialogue box has appeared asking for a user name and password and saying
that the server localhost at Tomcat Manager Application requires a username
and password.

I did set up a user name and password for Tomcat and so assume that this has
been set by the Tomcat developers at Apache.

This would seem to indicate that Tomcat is working ok but doesn't yet help
me to use it.

Thanks for the suggestion that I should read up on building and packaging
web applications and this is what I am doing by using the Java for Dummies
book and the Skillsoft online training course. It was the Java for Dummies
book that recommended Tomcat so that I could test out my Java servlets and I
have followed the instructions in that book and the Tomcat documentation to
install Tomcat and to store my initial very simple servlet. But, as my
initial post indicated, the instructions on how to use Tomcat and to test
that it is working, do not seem to be correct.

Your answer my test has, I think, indicate that Tomcat has been installed
correctly but I still don't know how to use it.

Further help and advice would be much appreciated.

Best Regards,

Pete

Kees de Kooter wrote:

Did you try to access the manager application at
http://localhost:8080/manager/html?

If that works your tomcat is running fine.

I suggest you read up on building and packaging java web applications.
You can deploy your .war files using this manager application.

On Thu, Dec 11, 2008 at 11:51, BoyePeter
[EMAIL PROTECTED] wrote:

Hi Folks,

After installing Tomcat and trying to check that it is working OK, I get
the
HTTP 400 error message.

Prior to doing all the above, I had cleaned my system by removing all
previous version of Java and tomcat. I also ran Norton 360 Registry
cleanup
to try to make sure that there were no random or odd registry entries. I
hard rebooted the PC and then started the Java and tomcat installations.

When I start up tomcat in the command window, it appears to be
successfully
loaded reporting that it is using port 8080.

All of the above is standard and in line with the documentation.

BUT

when I try to test the installation using the examples that come with
tomcat
using the URL http://localhost:8080/ I get the HTTP 400 Bad Request
message.

This tells me that IE was able to connect to the web server but the web
page
could not be found because of a problem with the address.

I have tried loading my servlet into the tomcat classes directory but get
the same message.

I have tried adding various tomcat directories to the URL (e.g. examples)
but get the same message.

If I stop tomcat and try the URL, I get a different IE error that
recognises
that there is no web server running. I did this to check whether I had
another webserver also running in the background.

The Tomcat documentation on trouble shooting does not mention this error
and
clearly states that there are only 3 things that can go wrong with the
installation:

1. Port 8080 is being used by another process, in which case Yomcat
won't
start.
2. An Out of Environment Space error that affects Windows 95, 98 and
ME.
3. The localhost isn't found because one is behind a proxy.

None of these would seem to apply to my situation.

Can anyone, please, provide some insight into how I can overcome this
problem.

Ta much best regards,

Pete

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Re: Tomcat caching of static resources?

Sorry, I don't remember of your pages are protected or not (even the 
static ones I mean).


But anyway, you might want to have a look at this :
http://www.tuckey.org/urlrewrite/

Manual for 3.2, and scroll down to the set response-header bit.

It's a servlet filter with a lot of capabilities. The initial idea is a 
Tomcat equivalement of the Apache http mod_rewrite module.
In this case you don't want (I think) to rewrite the request URL, just 
to conditionally add a response header, but it seems it can do that too.



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RE: HTTP 400 Error when trying to check Tomcat installation

2008-12-11 Thread BEN HMIDA aymen

Hi Peter,
Where did you placed your application?

-Message d'origine-
De : BoyePeter [mailto:[EMAIL PROTECTED]
Envoyé : jeudi 11 décembre 2008 13:50
À : users@tomcat.apache.org
Objet : Re: HTTP 400 Error when trying to check Tomcat installation

Hi,

Thanks for the reply and have just tried your suggestion.

A dialogue box has appeared asking for a user name and password and saying
that the server localhost at Tomcat Manager Application requires a username
and password.

I did set up a user name and password for Tomcat and so assume that this has
been set by the Tomcat developers at Apache.

This would seem to indicate that Tomcat is working ok but doesn't yet help
me to use it.

Your answer my test has, I think, indicate that Tomcat has been installed
correctly but I still don't know how to use it.

Further help and advice would be much appreciated.

Best Regards,

Pete

Kees de Kooter wrote:

Did you try to access the manager application at
http://localhost:8080/manager/html?

If that works your tomcat is running fine.

I suggest you read up on building and packaging java web applications.
You can deploy your .war files using this manager application.

On Thu, Dec 11, 2008 at 11:51, BoyePeter
[EMAIL PROTECTED] wrote:

Hi Folks,

After installing Tomcat and trying to check that it is working OK, I get
the
HTTP 400 error message.

Prior to doing all the above, I had cleaned my system by removing all
previous version of Java and tomcat. I also ran Norton 360 Registry
cleanup
to try to make sure that there were no random or odd registry entries. I
hard rebooted the PC and then started the Java and tomcat installations.

When I start up tomcat in the command window, it appears to be
successfully
loaded reporting that it is using port 8080.

All of the above is standard and in line with the documentation.

BUT

when I try to test the installation using the examples that come with
tomcat
using the URL http://localhost:8080/ I get the HTTP 400 Bad Request
message.

This tells me that IE was able to connect to the web server but the web
page
could not be found because of a problem with the address.

I have tried loading my servlet into the tomcat classes directory but get
the same message.

I have tried adding various tomcat directories to the URL (e.g. examples)
but get the same message.

If I stop tomcat and try the URL, I get a different IE error that
recognises
that there is no web server running. I did this to check whether I had
another webserver also running in the background.

The Tomcat documentation on trouble shooting does not mention this error
and
clearly states that there are only 3 things that can go wrong with the
installation:

1. Port 8080 is being used by another process, in which case Yomcat
won't
start.
2. An Out of Environment Space error that affects Windows 95, 98 and
ME.
3. The localhost isn't found because one is behind a proxy.

None of these would seem to apply to my situation.

Can anyone, please, provide some insight into how I can overcome this
problem.

Ta much best regards,

Pete

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Re: HTTP 400 Error when trying to check Tomcat installation


BoyePeter wrote:

Hi,

Thanks for the reply and have just tried your suggestion.

A dialogue box has appeared asking for a user name and password and saying
that the server localhost at Tomcat Manager Application requires a username
and password.

I did set up a user name and password for Tomcat and so assume that this has
been set by the Tomcat developers at Apache.

I believe that you are confusing two things : the username and password 
under which Tomcat itself runs, and the username/password that Tomcat 
uses to protect access to the Manager application.

For this second one, look in the (tomcat-dir)/conf/tomcat-users.xml file.
If they are not there yet, add the following lines :

role rolename=manager/
user username=theBossHere password=qwerty roles=manager/

then restart Tomcat.
Close and re-open the browser, call the Manager page again, and use the 
above userid/password to login.




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Re: HTTP 400 Error when trying to check Tomcat installation

Ta very much for your response. I very stupidly did not think to stop and
restart Tomcat.

I have now got into the Manager application. I now have to read up and
understand how to use it.

My very best regards,

Pete

awarnier wrote:

BoyePeter wrote:
Hi,

Thanks for the reply and have just tried your suggestion.

A dialogue box has appeared asking for a user name and password and
saying
that the server localhost at Tomcat Manager Application requires a
username
and password.

I did set up a user name and password for Tomcat and so assume that this
has
been set by the Tomcat developers at Apache.

I believe that you are confusing two things : the username and password
under which Tomcat itself runs, and the username/password that Tomcat
uses to protect access to the Manager application.
For this second one, look in the (tomcat-dir)/conf/tomcat-users.xml file.
If they are not there yet, add the following lines :

role rolename=manager/
user username=theBossHere password=qwerty roles=manager/

then restart Tomcat.
Close and re-open the browser, call the Manager page again, and use the
above userid/password to login.

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Re: HTTP 400 Error when trying to check Tomcat installation

2008-12-11 Thread Markus Schönhaber

BoyePeter:

 I am running Windows XP Professional version 2002 SP 3 with all updates
 applied.
 I am running Internet Explorer v 7.0.5730.11.
 I have installed Java JDK 1.6.0_11 with the JRE from the same download.

Care to mention the Tomcat version you're using?

 I copied the servlet-api.jar to the JDK directory\jre\lib\ext.

Why?
Don't do that.

 I edited the c:\tomcat\conf\context.xml file to have Context
 reloadable=true.
 I edited the c:\tomcat\conf\web.exl file to un-comment the invoker entrie
 for servlet and servlet_mappings.

Why?
The Invoker Servlet is evil. It may be OK for a quick test but is a big
no-no for any installation reachable over the net.
I suggest you get used to create a webapp with a real deployment
descriptor instead.

 when I try to test the installation using the examples that come with tomcat
 using the URL http://localhost:8080/ I get the HTTP 400 Bad Request message.
 
 This tells me that IE was able to connect to the web server but the web page
 could not be found because of a problem with the address.

What do Tomcat's log messages show?
If you've not already done so, turn off IE's friendly error messages.

Regards
  mks


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RE: HTTP 400 Error when trying to check Tomcat installation


Hi Ben,

Thanks for the response. I put the compiled class into
   c:\tomcat\webapps\ROOT\WEB-INF\classes
It was a very simple Hello World servelt from the Java for Dummies book
(page 647) and on page 649 it says to move the compiled class file to that
directory.

Although I now have the Manager application working and have gained access
to it, I am even more puzzled that I cannot access the examples provided by
Tomcat in the way that they suggest.

The fact that I can get into the Manager application by using the URL
http::/localhost:8080/manager/html suggests that my Tomcat installation is
all working correctly but the recommended Tomcat URL
http://localhost:8080/; still gives the HTTP 400 error.

Ta much and best regards,

Pete




BEN HMIDA aymen wrote:
 
 Hi Peter,
 Where did you placed your application?
 
 -Message d'origine-
 De : BoyePeter [mailto:[EMAIL PROTECTED] 
 Envoyé : jeudi 11 décembre 2008 13:50
 À : users@tomcat.apache.org
 Objet : Re: HTTP 400 Error when trying to check Tomcat installation
 
 
 Hi,
 
 Thanks for the reply and have just tried your suggestion.
 
 A dialogue box has appeared asking for a user name and password and saying
 that the server localhost at Tomcat Manager Application requires a
 username
 and password.
 
 I did set up a user name and password for Tomcat and so assume that this
 has
 been set by the Tomcat developers at Apache.
 
 This would seem to indicate that Tomcat is working ok but doesn't yet help
 me to use it.
 
 Thanks for the suggestion that I should read up on building and packaging
 web applications and this is what I am doing by using the Java for Dummies
 book and the Skillsoft online training course. It was the Java for Dummies
 book that recommended Tomcat so that I could test out my Java servlets and
 I
 have followed the instructions in that book and the Tomcat documentation
 to
 install Tomcat and to store my initial very simple servlet. But, as my
 initial post indicated, the instructions on how to use Tomcat and to test
 that it is working, do not seem to be correct.
 
 Your answer  my test has, I think, indicate that Tomcat has been
 installed
 correctly but I still don't know how to use it.
 
 Further help and advice would be much appreciated.
 
 Best Regards,
 
 Pete
 
 
 
 
 
 Kees de Kooter wrote:
 
 Did you try to access the manager application at
 http://localhost:8080/manager/html?
 
 If that works your tomcat is running fine.
 
 I suggest you read up on building and packaging java web applications.
 You can deploy your .war files using this manager application.
 
 
 
 On Thu, Dec 11, 2008 at 11:51, BoyePeter
 [EMAIL PROTECTED] wrote:

 Hi Folks,

 After installing Tomcat and trying to check that it is working OK, I get
 the
 HTTP 400 error message.

 I am running Windows XP Professional version 2002 SP 3 with all updates
 applied.
 I am running Internet Explorer v 7.0.5730.11.
 I have installed Java JDK 1.6.0_11 with the JRE from the same download.
 I installed Tomcat 6.x Core from its zip into C:\tomcat.
 I set the environment variable JAVA_HOME to point to the JDK 1.6.0_11
 directory
 (C:\Program Files\Java\jdk1.6.0_11).
 The JRE is installed at C:\Program Files\Java\Jre6.
 I copied the servlet-api.jar to the JDK directory\jre\lib\ext.
 I edited the c:\tomcat\conf\context.xml file to have Context
 reloadable=true.
 I edited the c:\tomcat\conf\web.exl file to un-comment the invoker
 entrie
 for servlet and servlet_mappings.
 I checked all these by loading the files into IE and the entries were
 exactly as described in the tomcat documentation.
 I created the classes sub directory as
 c:\tomcat\webapps\ROOT\WEB-INF\classes.

 Prior to doing all the above, I had cleaned my system by removing all
 previous version of Java and tomcat. I also ran Norton 360 Registry
 cleanup
 to try to make sure that there were no random or odd registry entries. I
 hard rebooted the PC and then started the Java and tomcat installations.

 When I start up tomcat in the command window, it appears to be
 successfully
 loaded reporting that it is using port 8080.

 All of the above is standard and in line with the documentation.

 BUT

 when I try to test the installation using the examples that come with
 tomcat
 using the URL http://localhost:8080/ I get the HTTP 400 Bad Request
 message.

 This tells me that IE was able to connect to the web server but the web
 page
 could not be found because of a problem with the address.

 I have tried loading my servlet into the tomcat classes directory but
 get
 the same message.

 I have tried adding various tomcat directories to the URL (e.g.
 examples)
 but get the same message.

 If I stop tomcat and try the URL, I get a different IE error that
 recognises
 that there is no web server running. I did this to check whether I had
 another webserver also running in the background.

 The Tomcat documentation on trouble shooting does not mention this error
 and
 clearly states that there are

Re: HTTP 400 Error when trying to check Tomcat installation

Hi mks,
I have installed Tomcat version 6.
I copied the servlet-api.jar to the JDK directory because, according to Java
for Dummies, it is needed to compile my servlets. If it is not there,
Eclipse reports errors when trying to import javax.servlet.* and when I try
to use extends HttpServlet.

Perhaps I should have mentioned that I am trying to learn how to program in
Java and I am trying to set up the test environment for this. I am not
trying to set up a Web Server for the internet. The books that I read and
the Tomcat documentation said to change the invoker stuff.

I had a look at the Tomcat logs but, being the novice that I am, they didn't
mean anything to me.

Not sure how to turn off IE's friendly messages nor what would be the result
if I did so.

Pete

Markus Schönhaber-10 wrote:

BoyePeter:

I am running Windows XP Professional version 2002 SP 3 with all updates
applied.
I am running Internet Explorer v 7.0.5730.11.
I have installed Java JDK 1.6.0_11 with the JRE from the same download.

Care to mention the Tomcat version you're using?

I copied the servlet-api.jar to the JDK directory\jre\lib\ext.

Why?
Don't do that.

I edited the c:\tomcat\conf\context.xml file to have Context
reloadable=true.
I edited the c:\tomcat\conf\web.exl file to un-comment the invoker entrie
for servlet and servlet_mappings.

Why?
The Invoker Servlet is evil. It may be OK for a quick test but is a big
no-no for any installation reachable over the net.
I suggest you get used to create a webapp with a real deployment
descriptor instead.

when I try to test the installation using the examples that come with
tomcat
using the URL http://localhost:8080/ I get the HTTP 400 Bad Request
message.

This tells me that IE was able to connect to the web server but the web
page
could not be found because of a problem with the address.

What do Tomcat's log messages show?
If you've not already done so, turn off IE's friendly error messages.

Regards
mks

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Re: HTTP 400 Error when trying to check Tomcat installation


BoyePeter wrote:
[...]


Not sure how to turn off IE's friendly messages nor what would be the result
if I did so.


At least I can tell you something about that.
Just search in Google for ie friendly error messages, and about the 
first 30 results will tell you all you need to know about it.


The problem is that some of the error pages you see, are produced by IE 
and not by Tomcat.  So it is difficult for people here to help you, 
because they do not know what you are looking at.


Alternative (recommended) : install Firefox on your PC and use this to 
learn.  It also has a couple of nice plugins/add-ons that will help you 
a lot in learning about HTTP, HTML, XML etc..



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Re: HTTP 400 Error when trying to check Tomcat installation