Re: [OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread Christopher Schultz
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

John,

On 7/6/20 16:12, john.e.gr...@wellsfargo.com.INVALID wrote:
> Chris,
>> John,
>>
>> On 7/6/20 11:48, john.e.gr...@wellsfargo.com.INVALID wrote:
>>> Chris,
>>>
>>>
 -Original Message- From: Christopher Schultz
  Sent: Monday, July 06, 2020
 10:21 AM To: Tomcat Users List 
 Subject: [OT] Trying to determine the minimum heap required
 for an operation

>>> All,
>>>
>>> Definitely off-topic, but it's the kind of weird thing someone
>>> here might have experience with.
>>>
>>> I have an offline operation I'm considering bringing "inside"
>>> my web-based application. My only concern is memory usage: it
>>> requires that a bunch of data be loaded from a db into memory
>>> and then analyzed. It doesn't take long to execute -- maybe 10
>>> seconds or so, so the memory can be released back to the rest
>>> of the application.
>>>
>>> I've instrumented the command-line process with a thread which
>>> runs every .5sec and captures the used-memory, maintaining a
>>> high-water mark and reporting it after the whole operation is
>>> done. The first time I ran it (with no specific JVM
>>> memory-related settings), it reported that the high-water mark
>>> was ~450MiB.
>>>
>>> I figured that was higher than necessary, and probably just
>>> represented a lazy GC with loads of memory, so I constrained
>>> the process using -Xmx64M. That resulted in a 16MiB high-water
>>> mark. I tried again with -Xmx8M and the high-water mark became
>>> 5MiB.
>>>
>>> Is there a particularly good way to force the GC to be as
>>> aggressive as possible to see how low I can go, or should I
>>> just keep playing-around with the -Xmx setting.
>>>
>>> Another option is to serialize my in-memory structure to the
>>> disk to get a sense of the size in-memory, though it's really
>>> not the same -- it will at least get me in the right ballpark.
>>>
>>> Any suggestions?
>>>
>>> Thanks, -chris

 ---
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>>

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>>>
>>>
>>> I guess I’m that person with the weird experiences.
>>>
>>> Is memory or CPU in short supply?  If not, I don't think you'll
>>> have
>> a problem.  This isn't 1997 anymore.  I do think you should run a
>> realistic load test, however.
>>
>> No specific problem exists, but this is a multi-user web
>> application. Usually somewhere around 500 - 1000 users logged-in
>> at once. Session size is typically quite low -- only a handful of
>> small objects present with lots of sharing of "large" objects and
>> structures. Heap size is set to max 1GiB on each server and
>> memory usage shows a beautiful sawtooth pattern hovering around
>> ~400MiB for days at a time.
>>
>> I will certainly limit the number of these operations that can
>> occur at once, and they should be relatively rare. My test
>> example was using a small data set, but the size of the data-set
>> varies wildly with the client, so I have to be careful for the
>> larger ones.
>>
>> Busting the heap isn't something I'd like to have happen.
>>
>>> To me the most important GC metric is time spent per
>> minute/hour/etc.  The next most important metric is individual
>> pause durations.  Through testing you'll see what those numbers
>> are.  I work with some large apps that have multi-GB heaps and
>> it's rare to see GC time being over 1-2%.  IOW, 600-1200ms per
>> minute.  Often it's a fraction of a percent. With those small
>> numbers you're talking about, I don't think you'll have any
>> trouble in this area unless the server is very heavily loaded.
>>
>> Actually, I'm not super concerned about performance of the GC
>> itself. I was just wondering if there was a way to ask the JVM
>> "if you *had* to accomplish this task with the smallest possible
>> heap, what would it be?"
>>
>>> Be sure to enable verbose GC.  In java 8, it's something like
>>> this:
>>>
>>> -XX:+PrintGCDetails -XX:+PrintGCTimeStamps
>>> -XX:+PrintGCDateStamps
>> - -Xloggc:/path/to/gc.log
>>>
>>> Run tests with and without the changes.  You can analyze the GC
>>> output with tools like GCEasy and GCViewer.
>> Sure.
>>
>> Again, I'm more concerned with the overhead that will be required
>> for a particular operation, so I can predict when running such an
>> operation might end up endangering the application server's heap
>> -- and therefore the logged-in users.
>>
>> Theoretically, if the thread hits a heap-full error, the thread
>> will experience an OOME, release it's (temporary) large object
>> tree, and the GC will be able to recover, but after an OOME it's
>> never a great plan to trust the JVM for very long.
>>
>> - -chris -BEGIN PGP SIGNATURE- Comment: Using GnuPG with
>> Thunderbird - https://www.enigmail.net/
>>
>> iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl8DTR4ACgkQHPApP
>> 6U8
>> 

RE: [OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread John.E.Gregg
Chris,
> John,
> 
> On 7/6/20 11:48, john.e.gr...@wellsfargo.com.INVALID wrote:
> > Chris,
> >
> >
> >> -Original Message- From: Christopher Schultz
> >>  Sent: Monday, July 06, 2020 10:21 AM
> >> To: Tomcat Users List  Subject: [OT] Trying
> >> to determine the minimum heap required for an operation
> >>
> > All,
> >
> > Definitely off-topic, but it's the kind of weird thing someone here
> > might have experience with.
> >
> > I have an offline operation I'm considering bringing "inside" my
> > web-based application. My only concern is memory usage: it requires
> > that a bunch of data be loaded from a db into memory and then
> > analyzed. It doesn't take long to execute -- maybe 10 seconds or so,
> > so the memory can be released back to the rest of the application.
> >
> > I've instrumented the command-line process with a thread which runs
> > every .5sec and captures the used-memory, maintaining a high-water
> > mark and reporting it after the whole operation is done. The first
> > time I ran it (with no specific JVM memory-related settings), it
> > reported that the high-water mark was ~450MiB.
> >
> > I figured that was higher than necessary, and probably just
> > represented a lazy GC with loads of memory, so I constrained the
> > process using -Xmx64M. That resulted in a 16MiB high-water mark. I
> > tried again with -Xmx8M and the high-water mark became 5MiB.
> >
> > Is there a particularly good way to force the GC to be as aggressive
> > as possible to see how low I can go, or should I just keep
> > playing-around with the -Xmx setting.
> >
> > Another option is to serialize my in-memory structure to the disk to
> > get a sense of the size in-memory, though it's really not the same --
> > it will at least get me in the right ballpark.
> >
> > Any suggestions?
> >
> > Thanks, -chris
> >>
> >> -
> >>
> >>
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> >> For additional commands, e-mail: users-h...@tomcat.apache.org
> >
> >
> > I guess I’m that person with the weird experiences.
> >
> > Is memory or CPU in short supply?  If not, I don't think you'll have
> a problem.  This isn't 1997 anymore.  I do think you should run a realistic 
> load
> test, however.
> 
> No specific problem exists, but this is a multi-user web application.
> Usually somewhere around 500 - 1000 users logged-in at once. Session size is
> typically quite low -- only a handful of small objects present with lots of
> sharing of "large" objects and structures. Heap size is set to max 1GiB on 
> each
> server and memory usage shows a beautiful sawtooth pattern hovering
> around ~400MiB for days at a time.
> 
> I will certainly limit the number of these operations that can occur at once,
> and they should be relatively rare. My test example was using a small data
> set, but the size of the data-set varies wildly with the client, so I have to 
> be
> careful for the larger ones.
> 
> Busting the heap isn't something I'd like to have happen.
> 
> > To me the most important GC metric is time spent per
> minute/hour/etc.  The next most important metric is individual pause
> durations.  Through testing you'll see what those numbers are.  I work with
> some large apps that have multi-GB heaps and it's rare to see GC time being
> over 1-2%.  IOW, 600-1200ms per minute.  Often it's a fraction of a percent.
> With those small numbers you're talking about, I don't think you'll have any
> trouble in this area unless the server is very heavily loaded.
> 
> Actually, I'm not super concerned about performance of the GC itself.
> I was just wondering if there was a way to ask the JVM "if you *had* to
> accomplish this task with the smallest possible heap, what would it be?"
> 
> > Be sure to enable verbose GC.  In java 8, it's something like
> > this:
> >
> > -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps
> - -Xloggc:/path/to/gc.log
> >
> > Run tests with and without the changes.  You can analyze the GC output
> > with tools like GCEasy and GCViewer.
> Sure.
> 
> Again, I'm more concerned with the overhead that will be required for a
> particular operation, so I can predict when running such an operation might
> end up endangering the application server's heap -- and therefore the
> logged-in users.
> 
> Theoretically, if the thread hits a heap-full error, the thread will 
> experience
> an OOME, release it's (temporary) large object tree, and the GC will be able
> to recover, but after an OOME it's never a great plan to trust the JVM for
> very long.
> 
> - -chris
> -BEGIN PGP SIGNATURE-
> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
> 
> iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl8DTR4ACgkQHPApP
> 6U8
> pFiAkQ//cWQ/CL35LJcRIervUhnByPXg/TN1MhfOl66zXx4upJcIpPXgBuIkigbe
> 9d9y/jFnRCyHsFodSEsjtT/q2CxD7k30DIAwRrTaGxzrz60QlD/+t8l3getT9xot
> s0bAxvlpjZTvvhTtpAAv9hkSwJuMxxECksbqmYXaO/rtoBu/N9R8MCjPz4cihTa
> B
> 

Re: RFC7807 ErrorReportValve

2020-07-06 Thread Thomas Meyer
Am 5. Juli 2020 11:28:40 MESZ schrieb Michael Osipov :
>Am 2020-07-02 um 21:30 schrieb Thomas Meyer:
>> Hi,
>> 
>> What are your opinions on providing a RFC7807 based ErrorReportValve
>as part of Tomcat default distribution?
>
>Thomas, this has been bugging me for a while. Let me share some
>thoughts 
>on this, I'll limit my experiences with Tomcat, Spring Web and Zalando 
>Problem (including it's web module):
>
>Mark, please correct me if my citation of the Servlet API is wrong.
>
>* The Servlet API has been designed where the only clients where
>browsers
>* The Servlet API mandates that all invocations of 
>HttpServletResponse#setError() must yield in a HTML page and this 
>*cannot* be changed by defult
>* Even if you write a REST API or explicitly use @RestController Spring
>
>will still invoke #setError() although it makes no sense. I consider 
>this to be a conceptual flaw in the Spring framework.
>
>Before we continue which issue do you want to solve? Tomcat produced 
>errors or by a framework?

It's about tomcat produced errors:

There are multiple webapps deployed to tomcat all under non-root context path.

Some webapps use spring framework, for these webapps an CustomErrorController 
is installed so always a JSON response in a given JSON layout is done.

Some webapps are pure servlet based, here an error-page entry in web.xml and an 
ErrrorSerlvet is used to also have the same JSON layout as above for all 
possible errors.

But because of some race condition in deployment scripts for multi node setup, 
some class files weren't copies correctly, and tomcat ErrorReportValve was 
triggered with NoClassDef error.

So much for the context.

I guess I'll write an JsonErrorReportValve and install it in lib/ so deployment 
will always response with same JSON layout in all circumstances, e.g. failed 
deployment or access to unknown context path.

>  As for the framework, I would prefer to file
>
>an issue with Spring Framework first and see what the devs say because 
>this would solely solve a symptom.
>
>Michael
>
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[ANN] Apache Tomcat 8.5.57 available

2020-07-06 Thread Mark Thomas
The Apache Tomcat team announces the immediate availability of Apache
Tomcat 8.5.57.

Apache Tomcat 8 is an open source software implementation of the Java
Servlet, JavaServer Pages, Java Unified Expression Language, Java
WebSocket and Java Authentication Service Provider Interface for
Containers technologies.

Apache Tomcat 8.5.x replaces 8.0.x and includes new features pulled
forward from the 9.0.x branch. The notable changes since 8.5.56 include:

- Implement a significant portion of the TLS environment variables
  for the rewrite valve.

- Reduce memory footprint of closed HTTP/2 streams

- Improve parsing of RFC 2109 cookies

Please refer to the change log for the complete list of changes:
http://tomcat.apache.org/tomcat-8.5-doc/changelog.html


Downloads:
http://tomcat.apache.org/download-80.cgi

Migration guides from Apache Tomcat 7.x and 8.0.x:
http://tomcat.apache.org/migration.html

Enjoy!

- The Apache Tomcat team


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Re: Problem with JarScanFilter, maybe a bug?

2020-07-06 Thread Christopher Schultz
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Vitor,

On 7/6/20 15:50, Vitor Medina Cruz wrote:
> On Mon, Jul 6, 2020 at 8:57 AM Mark Thomas 
> wrote:
>
>> On 06/07/2020 12:25, Mark Thomas wrote:
>>> On 03/07/2020 13:40, Vitor Medina Cruz wrote:
 On Thu, Jul 2, 2020 at 11:21 AM Mark Thomas
  wrote:

> On 02/07/2020 14:14, Vitor Medina Cruz wrote:
>> On Wed, Jul 1, 2020 at 6:48 PM Mark Thomas
>>  wrote:
>
> 
>
>>> @WebFiler, @WebListener and @WebServlet are deployment
>>> annotations so scanning for these is controlled by the
>>> JarScanner.
>>>
>>> If an SCI has an @HandlesTypes annotation then all JARs
>>> that are potential SCI sources will be scanned for
>>> matches. To put it another way, the JarScanner
>>> configuration does NOT control the search for
>>> @HandlesTypes matches. Any JAR eligible to provide an
>>> SCI will be scanned for @HandlesTypes. Those JARs are
>>> controlled by
> 
>>>
>>
>> Ok, and if a jar doesn't provide a web-fragment name? In
>> this old
>> post(
>>
>
>> http://tomcat.10.x6.nabble.com/Why-does-absolute-ordering-in-web-xml-
without-others-kill-classpath-scanning-td5029985.html
>
>>
)
>> it is said :
>>
>> "Tomcat will give these a name equal to the name of the
>> JAR file so
>> you
> can
>> use it in ordering. That is a Tomcat specific feature."
>>
>> This is/holds true? I tried with no success
>
> It should do. So for foobar-0.3.jar the name should be
> "foobar-0.3.jar"
>
>
 Don't work... :( both in Tomcat 8.5.56 and 9.0.36 I got a
 "Used a wrong fragment name [flow-server-2.2.1.jar] at
 web.xml absolute-ordering tag"
>>>
>>> Hmm. Let me look into what is going on here...
>>
>> My memory and the comment from 2015 were incorrect. It is the
>> full URL that is used rather than just the name.
>>
>> While the JAR name should be unique within WEB-INF/lib, the JAR
>> scanning extends outside of that to include CATALINA_BASE/lib and
>> potentially the the bootstrap class path. Duplicates can trigger
>> deployment failure - hence the more cautious approach.
>>
>> As an example, this is the URL on my system (taken from Tomcat
>> 10.0.x but the code should be the same in 9.0.x and 8.5.x):
>>
>>
>> file:/home/mark/repos/asf-tomcat-10.0.x/output/build/webapps/examples
/WEB-INF/lib/taglibs-standard-impl-1.2.5-migrated-0.0.1.jar
>>
>>
>>
Rather long for a fragment but it ensures uniqueness.
>>
>
> Thanks, that worked! In my windows machine I used file:/C:/ the path>
>
>
> Is it possible to use relative path of some sort in order to not
> tie this config to my machine?

No promises, but you could try:

${catalina.base}/path/relative/to/tomcat

for example:

${catalina.base}/webapps/mywebapp/WEB-INF/lib/taglibs-standard-impl-1.2.
5-migrated-0.0.1.jar

I don't know if the system-property-replacement will be honored in
that particular context, but it is supported in others. It seems like
that could be added if it's not already supported.

- -chris
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Re: Add custom Authenticator in context.xml

2020-07-06 Thread Thomas Meyer
Am 6. Juli 2020 14:14:59 MESZ schrieb Mark Thomas :
>On 04/07/2020 19:54, Thomas Meyer wrote:
>> Hi,
>> 
>> a while ago I did write a little POC of how to add a custom
>> authenticator scheme to tomcat.
>> 
>> this is what I did come up with:
>> https://github.com/thomasmey/BearerTokenAuthenticator
>> 
>> It's rather complicated solution!
>> Is there an more easy solution to add a custom authenticator scheme
>to a Context/context.xml? 
>
>How about:
>
>1. Extract the Authenticators.properties file from catalina.jar
>   (or from source)
>2. Edit it to reference the custom Authenticator
>3. Place it at $CATALINA_BASE/lib/org/apache/catalina/startup
>4. Add the JAR with the custom authenticator to $CATALINA_BASE/lib
>
>which would make it generally available to use in WEB-INF/web.xml

Okay, understand! Nice trick.

>
>Or
>
>1. Add it directly to context.xml as:
>
>
>   className="de.m3y3r.catalina.authenticator.BearerTokenAuthenticator" />
>

Ah, okay an Authenticator is also a Valve, I didn't think about this!

I will play around with this setup a bit. thanks for the hint!

>
>which you would need to do for each app that wants to use it (or set it
>in the global web.xml for all apps).
>
>Mark
>
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[ANN] Apache Tomcat 9.0.37 available

2020-07-06 Thread Mark Thomas
The Apache Tomcat team announces the immediate availability of Apache
Tomcat 9.0.37.

Apache Tomcat 9 is an open source software implementation of the Java
Servlet, JavaServer Pages, Java Unified Expression Language, Java
WebSocket and JASPIC technologies.

Apache Tomcat 9.0.37 is a bugfix and feature release. The notable
changes compared to 9.0.36 include:

- Implement a significant portion of the TLS environment variables
  for the rewrite valve.

- Improvements to the creation of OSGi manifests.

- Reduce memory footprint of closed HTTP/2 streams

Please refer to the change log for the complete list of changes:
http://tomcat.apache.org/tomcat-9.0-doc/changelog.html


Downloads:
http://tomcat.apache.org/download-90.cgi

Migration guides from Apache Tomcat 7.x and 8.x:
http://tomcat.apache.org/migration.html

Enjoy!

- The Apache Tomcat team


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Re: Problem with JarScanFilter, maybe a bug?

2020-07-06 Thread Vitor Medina Cruz
On Mon, Jul 6, 2020 at 8:57 AM Mark Thomas  wrote:

> On 06/07/2020 12:25, Mark Thomas wrote:
> > On 03/07/2020 13:40, Vitor Medina Cruz wrote:
> >> On Thu, Jul 2, 2020 at 11:21 AM Mark Thomas  wrote:
> >>
> >>> On 02/07/2020 14:14, Vitor Medina Cruz wrote:
>  On Wed, Jul 1, 2020 at 6:48 PM Mark Thomas  wrote:
> >>>
> >>> 
> >>>
> > @WebFiler, @WebListener and @WebServlet are deployment annotations so
> > scanning for these is controlled by the JarScanner.
> >
> > If an SCI has an @HandlesTypes annotation then all JARs that are
> > potential SCI sources will be scanned for matches. To put it another
> > way, the JarScanner configuration does NOT control the search for
> > @HandlesTypes matches. Any JAR eligible to provide an SCI will be
> > scanned for @HandlesTypes. Those JARs are controlled by
> >>> 
> >
> 
>  Ok, and if a jar doesn't provide a web-fragment name? In this old
> post(
> 
> >>>
> http://tomcat.10.x6.nabble.com/Why-does-absolute-ordering-in-web-xml-without-others-kill-classpath-scanning-td5029985.html
> >>> )
>  it is said :
> 
>  "Tomcat will give these a name equal to the name of the JAR file so
> you
> >>> can
>  use it in ordering. That is a Tomcat specific feature."
> 
>  This is/holds true? I tried with no success
> >>>
> >>> It should do. So for foobar-0.3.jar the name should be "foobar-0.3.jar"
> >>>
> >>>
> >> Don't work... :( both in Tomcat 8.5.56 and 9.0.36 I got a "Used a wrong
> >> fragment name [flow-server-2.2.1.jar] at web.xml absolute-ordering tag"
> >
> > Hmm. Let me look into what is going on here...
>
> My memory and the comment from 2015 were incorrect. It is the full URL
> that is used rather than just the name.
>
> While the JAR name should be unique within WEB-INF/lib, the JAR scanning
> extends outside of that to include CATALINA_BASE/lib and potentially the
> the bootstrap class path. Duplicates can trigger deployment failure -
> hence the more cautious approach.
>
> As an example, this is the URL on my system (taken from Tomcat 10.0.x
> but the code should be the same in 9.0.x and 8.5.x):
>
>
> file:/home/mark/repos/asf-tomcat-10.0.x/output/build/webapps/examples/WEB-INF/lib/taglibs-standard-impl-1.2.5-migrated-0.0.1.jar
>
> Rather long for a fragment but it ensures uniqueness.
>

Thanks, that worked! In my windows machine I used file:/C:/


Is it possible to use relative path of some sort in order to not tie this
config to my machine?



>
> Mark
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
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>
>


[ANN] Apache Tomcat 10.0.0-M7 available

2020-07-06 Thread Mark Thomas
The Apache Tomcat team announces the immediate availability of Apache
Tomcat 10.0.0-M7.

Apache Tomcat 10 is an open source software implementation of the
Jakarta Servlet, Jakarta Server Pages, Jakarta Expression Language,
Jakarta WebSocket, Jakarta Authentication and Jakarta Annotations
specifications.

Users of Tomcat 10 onwards should be aware that, as a result of the move
from Java EE to Jakarta EE as part of the transfer of Java EE to the
Eclipse Foundation, the primary package for all implemented APIs has
changed from javax.* to jakarta.*. This will almost certainly require
code changes to enable applications to migrate from Tomcat 9 and earlier
to Tomcat 10 and later. A migration tool is under development to aid
this process.

Apache Tomcat 10.0.0-M7 is a milestone release of the 10.0.x
branch and has been made to provide users with early access to the new
features in Apache Tomcat 10.0.x so that they may provide feedback. The
notable changes compared to 10.0.0-M6 include:

- Implement a significant portion of the TLS environment variables
  for the rewrite valve.

- Add the Jakarta EE 9 schema.

- Improvements to the creation of OSGi manifests.

Please refer to the change log for the complete list of changes:
http://tomcat.apache.org/tomcat-10.0-doc/changelog.html

Downloads:
http://tomcat.apache.org/download-10.cgi

Migration guides from Apache Tomcat 7.0.x, 8.5.x and 9.0.x:
http://tomcat.apache.org/migration.html

Enjoy!

- The Apache Tomcat team

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Re: SameSite attribute handling

2020-07-06 Thread Christopher Schultz
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Abirami,

On 7/6/20 12:16, S Abirami wrote:
> I have used setHeader, addCookie for that also  it is getting
> twice

Of course it is, if Tomcat is automatically adding a Cookie to the
response for you.

> Only after, disabling cookie false in context.xml  setHeader for
> cookie is working.

What exact version of Tomcat are you using?

What is the problem you are trying to solve?

If you are setting sameSiteCookies to something other than "unset",
then it will affect all cookies for which Tomcat generates a
"Set-Cookie" header.

> I tried option also
??

- From your original post:

> Context changes reflecting issue in tenable vulnerable.

I'm not sure I understand what you are saying, here. Can you explain
in a different way?

- -chris

> -Original Message- From: Christopher Schultz
>  Sent: Thursday, July 2, 2020 11:07
> PM To: Tomcat Users List  Subject: Re:
> SameSite attribute handling
>
> Abirami,
>
> On 7/1/20 03:06, S Abirami wrote:
>> We can add the samesite attribute in set-cookie header through
>> context.xml entry in tomcat. Is there any other way, can we add
>> samesite attribute in response of set-cookie header.
> Not for Tomcat-generated cookies, and not for cookies added to the
> response like this:
>
> response.addCookie(myCookie);
>
> This is because the Servlet API hasn't yet caught up with
> state-of-the-art.
>
> You can, however, craft your own Set-Cookie response header like
> this:
>
> response.addHeader("Set-Cookie", "CookieName=value;
> SameSite=Strict");
>
> Remember that there are rules about the composition of the cookie's
> name, value, etc. that Tomcat enforces for you that you will have
> to handel yourself.
>
>> I tried with filter by using setHeader but it is sending two
>> set-Cookie header.
>
> Correct: you will have to use *either* setCookie() or setHeader().
>
> -chris
>
> -
>
>
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RE: SameSite attribute handling

2020-07-06 Thread S Abirami
Hi Christopher,

I have used setHeader, addCookie for that also  it is getting twice
Only after, disabling cookie false in context.xml  setHeader for cookie is 
working.

I tried option also


Regards,
Abirami.S

-Original Message-
From: Christopher Schultz  
Sent: Thursday, July 2, 2020 11:07 PM
To: Tomcat Users List 
Subject: Re: SameSite attribute handling

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Abirami,

On 7/1/20 03:06, S Abirami wrote:
> We can add the samesite attribute in set-cookie header through 
> context.xml entry in tomcat. Is there any other way, can we add 
> samesite attribute in response of set-cookie header.
Not for Tomcat-generated cookies, and not for cookies added to the response 
like this:

  response.addCookie(myCookie);

This is because the Servlet API hasn't yet caught up with state-of-the-art.

You can, however, craft your own Set-Cookie response header like this:

  response.addHeader("Set-Cookie", "CookieName=value; SameSite=Strict");

Remember that there are rules about the composition of the cookie's name, 
value, etc. that Tomcat enforces for you that you will have to handel yourself.

> I tried with filter by using setHeader but it is sending two 
> set-Cookie header.

Correct: you will have to use *either* setCookie() or setHeader().

- -chris
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Re: [OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread Christopher Schultz
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

John,

On 7/6/20 11:48, john.e.gr...@wellsfargo.com.INVALID wrote:
> Chris,
>
>
>> -Original Message- From: Christopher Schultz
>>  Sent: Monday, July 06, 2020 10:21
>> AM To: Tomcat Users List  Subject: [OT]
>> Trying to determine the minimum heap required for an operation
>>
> All,
>
> Definitely off-topic, but it's the kind of weird thing someone here
> might have experience with.
>
> I have an offline operation I'm considering bringing "inside" my
> web-based application. My only concern is memory usage: it requires
> that a bunch of data be loaded from a db into memory and then
> analyzed. It doesn't take long to execute -- maybe 10 seconds or
> so, so the memory can be released back to the rest of the
> application.
>
> I've instrumented the command-line process with a thread which runs
> every .5sec and captures the used-memory, maintaining a high-water
> mark and reporting it after the whole operation is done. The first
> time I ran it (with no specific JVM memory-related settings), it
> reported that the high-water mark was ~450MiB.
>
> I figured that was higher than necessary, and probably just
> represented a lazy GC with loads of memory, so I constrained the
> process using -Xmx64M. That resulted in a 16MiB high-water mark. I
> tried again with -Xmx8M and the high-water mark became 5MiB.
>
> Is there a particularly good way to force the GC to be as
> aggressive as possible to see how low I can go, or should I just
> keep playing-around with the -Xmx setting.
>
> Another option is to serialize my in-memory structure to the disk
> to get a sense of the size in-memory, though it's really not the
> same -- it will at least get me in the right ballpark.
>
> Any suggestions?
>
> Thanks, -chris
>>
>> -
>>
>>
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
>> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>
> I guess I’m that person with the weird experiences.
>
> Is memory or CPU in short supply?  If not, I don't think you'll
> have
a problem.  This isn't 1997 anymore.  I do think you should run a
realistic load test, however.

No specific problem exists, but this is a multi-user web application.
Usually somewhere around 500 - 1000 users logged-in at once. Session
size is typically quite low -- only a handful of small objects present
with lots of sharing of "large" objects and structures. Heap size is
set to max 1GiB on each server and memory usage shows a beautiful
sawtooth pattern hovering around ~400MiB for days at a time.

I will certainly limit the number of these operations that can occur
at once, and they should be relatively rare. My test example was using
a small data set, but the size of the data-set varies wildly with the
client, so I have to be careful for the larger ones.

Busting the heap isn't something I'd like to have happen.

> To me the most important GC metric is time spent per
minute/hour/etc.  The next most important metric is individual pause
durations.  Through testing you'll see what those numbers are.  I work
with some large apps that have multi-GB heaps and it's rare to see GC
time being over 1-2%.  IOW, 600-1200ms per minute.  Often it's a
fraction of a percent.  With those small numbers you're talking about,
I don't think you'll have any trouble in this area unless the server
is very heavily loaded.

Actually, I'm not super concerned about performance of the GC itself.
I was just wondering if there was a way to ask the JVM "if you *had*
to accomplish this task with the smallest possible heap, what would it
be?"

> Be sure to enable verbose GC.  In java 8, it's something like
> this:
>
> -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps
- -Xloggc:/path/to/gc.log
>
> Run tests with and without the changes.  You can analyze the GC
> output with tools like GCEasy and GCViewer.
Sure.

Again, I'm more concerned with the overhead that will be required for
a particular operation, so I can predict when running such an
operation might end up endangering the application server's heap --
and therefore the logged-in users.

Theoretically, if the thread hits a heap-full error, the thread will
experience an OOME, release it's (temporary) large object tree, and
the GC will be able to recover, but after an OOME it's never a great
plan to trust the JVM for very long.

- -chris
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Re: [OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread Suvendu Sekhar Mondal
Hello Christopher,

On Mon, Jul 6, 2020, 8:50 PM Christopher Schultz <
ch...@christopherschultz.net> wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
>
> All,
>
> Definitely off-topic, but it's the kind of weird thing someone here
> might have experience with.
>
> I have an offline operation I'm considering bringing "inside" my
> web-based application. My only concern is memory usage: it requires
> that a bunch of data be loaded from a db into memory and then
> analyzed. It doesn't take long to execute -- maybe 10 seconds or so,
> so the memory can be released back to the rest of the application.
>
> I've instrumented the command-line process with a thread which runs
> every .5sec and captures the used-memory, maintaining a high-water
> mark and reporting it after the whole operation is done. The first
> time I ran it (with no specific JVM memory-related settings), it
> reported that the high-water mark was ~450MiB.
>
> I figured that was higher than necessary, and probably just
> represented a lazy GC with loads of memory, so I constrained the
> process using -Xmx64M. That resulted in a 16MiB high-water mark. I
> tried again with -Xmx8M and the high-water mark became 5MiB.
>
> Is there a particularly good way to force the GC to be as aggressive
> as possible to see how low I can go, or should I just keep
> playing-around with the -Xmx setting.
>

Looks like you wanted to track live objects generated by your program. I
don't recall a JMX metrics of JVM to get that. If someway you can trigger
couple of Full GCs during processing and logging everything on a GC log,
then you'll get that. So, reducing -Xmx will help after some iterations.

One thing you can try using is -Dsun.rmi.dgc.client.gcInterval and server
flags and set them to 1 sec. That way you will get Full GC every 1 sec. It
worked properly with Parallel GC and doesn't work with G1 in JDK 1.8. You
can try and see if serves your purpose.

More on that property can be found at
https://docs.oracle.com/javase/8/docs/technotes/guides/rmi/sunrmiproperties.html

>
> Another option is to serialize my in-memory structure to the disk to
> get a sense of the size in-memory, though it's really not the same --
> it will at least get me in the right ballpark.
>
> Any suggestions?
>
> Thanks,
> - -chris
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RE: [OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread John.E.Gregg
Chris,


> -Original Message-
> From: Christopher Schultz 
> Sent: Monday, July 06, 2020 10:21 AM
> To: Tomcat Users List 
> Subject: [OT] Trying to determine the minimum heap required for an
> operation
> 
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
> 
> All,
> 
> Definitely off-topic, but it's the kind of weird thing someone here might have
> experience with.
> 
> I have an offline operation I'm considering bringing "inside" my web-based
> application. My only concern is memory usage: it requires that a bunch of
> data be loaded from a db into memory and then analyzed. It doesn't take
> long to execute -- maybe 10 seconds or so, so the memory can be released
> back to the rest of the application.
> 
> I've instrumented the command-line process with a thread which runs every
> .5sec and captures the used-memory, maintaining a high-water mark and
> reporting it after the whole operation is done. The first time I ran it (with 
> no
> specific JVM memory-related settings), it reported that the high-water mark
> was ~450MiB.
> 
> I figured that was higher than necessary, and probably just represented a
> lazy GC with loads of memory, so I constrained the process using -Xmx64M.
> That resulted in a 16MiB high-water mark. I tried again with -Xmx8M and the
> high-water mark became 5MiB.
> 
> Is there a particularly good way to force the GC to be as aggressive as
> possible to see how low I can go, or should I just keep playing-around with
> the -Xmx setting.
> 
> Another option is to serialize my in-memory structure to the disk to get a
> sense of the size in-memory, though it's really not the same -- it will at 
> least
> get me in the right ballpark.
> 
> Any suggestions?
> 
> Thanks,
> - -chris
> -BEGIN PGP SIGNATURE-
> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
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I guess I’m that person with the weird experiences.

Is memory or CPU in short supply?  If not, I don't think you'll have a problem. 
 This isn't 1997 anymore.  I do think you should run a realistic load test, 
however.

To me the most important GC metric is time spent per minute/hour/etc.  The next 
most important metric is individual pause durations.  Through testing you'll 
see what those numbers are.  I work with some large apps that have multi-GB 
heaps and it's rare to see GC time being over 1-2%.  IOW, 600-1200ms per 
minute.  Often it's a fraction of a percent.  With those small numbers you're 
talking about, I don't think you'll have any trouble in this area unless the 
server is very heavily loaded.

Be sure to enable verbose GC.  In java 8, it's something like this:

-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps 
-Xloggc:/path/to/gc.log

Run tests with and without the changes.  You can analyze the GC output with 
tools like GCEasy and GCViewer.

John




[OT] Trying to determine the minimum heap required for an operation

2020-07-06 Thread Christopher Schultz
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

All,

Definitely off-topic, but it's the kind of weird thing someone here
might have experience with.

I have an offline operation I'm considering bringing "inside" my
web-based application. My only concern is memory usage: it requires
that a bunch of data be loaded from a db into memory and then
analyzed. It doesn't take long to execute -- maybe 10 seconds or so,
so the memory can be released back to the rest of the application.

I've instrumented the command-line process with a thread which runs
every .5sec and captures the used-memory, maintaining a high-water
mark and reporting it after the whole operation is done. The first
time I ran it (with no specific JVM memory-related settings), it
reported that the high-water mark was ~450MiB.

I figured that was higher than necessary, and probably just
represented a lazy GC with loads of memory, so I constrained the
process using -Xmx64M. That resulted in a 16MiB high-water mark. I
tried again with -Xmx8M and the high-water mark became 5MiB.

Is there a particularly good way to force the GC to be as aggressive
as possible to see how low I can go, or should I just keep
playing-around with the -Xmx setting.

Another option is to serialize my in-memory structure to the disk to
get a sense of the size in-memory, though it's really not the same --
it will at least get me in the right ballpark.

Any suggestions?

Thanks,
- -chris
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Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/

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Re: RFC7807 ErrorReportValve

2020-07-06 Thread Mark Thomas
On 05/07/2020 10:28, Michael Osipov wrote:
> Am 2020-07-02 um 21:30 schrieb Thomas Meyer:
>> Hi,
>>
>> What are your opinions on providing a RFC7807 based ErrorReportValve
>> as part of Tomcat default distribution?
> 
> Thomas, this has been bugging me for a while. Let me share some thoughts
> on this, I'll limit my experiences with Tomcat, Spring Web and Zalando
> Problem (including it's web module):
> 
> Mark, please correct me if my citation of the Servlet API is wrong.
> 
> * The Servlet API has been designed where the only clients where browsers

I don't think anything in the Servlet API is browser specific. That use
case is certainly supported but I don't think that support is exclusive.

> * The Servlet API mandates that all invocations of
> HttpServletResponse#setError() must yield in a HTML page and this
> *cannot* be changed by defult

I don't recall any requirement to that effect and I can't find anything
looking in the spec.

The requirement is that the error handling mechanism is invoked. Nothing
stops an application providing an error servlet configured to handle all
errors. That could return HTML, JSON, XML, text/plain, etc.

Tomcat's default implementation returns HTML.

> * Even if you write a REST API or explicitly use @RestController Spring
> will still invoke #setError() although it makes no sense. I consider
> this to be a conceptual flaw in the Spring framework.

Why? That using sendError() just invokes the error handling mechanism.
What matters is what is configured to handle those errors.

Mark

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Re: RFC7807 ErrorReportValve

2020-07-06 Thread Mark Thomas
On 03/07/2020 20:42, Thomas Meyer wrote:
> Am 2. Juli 2020 21:45:53 MESZ schrieb Mark Thomas :
>> On 02/07/2020 20:30, Thomas Meyer wrote:
>>> Hi,
>>>
>>> What are your opinions on providing a RFC7807 based ErrorReportValve
>> as part of Tomcat default distribution?
>>
>> RFC 7807 looks to be application specific so support for that RFC looks
>> to be better handled at the application level.
> 
> Mhh, okay, sad to hear.
> 
> The basic idea was to provide an ErrorReportValve that always responds with 
> an JSON, given the use case that tomcat is sometimes used purely as an HTTP 
> JSON based API server, aka. REST, this Valve would always return an JSON 
> object and not suddenly an HTML page if for any reason something goes 
> horrible wrong.
> 
> It would be a nice to have for tomcat to provide an out of the box support 
> for this use case.
> 
> But yes the format of the JSON is hard to define generally, above RFC was one 
> of the first search results :-)

If there was something that could be done generically at the container
level then I'd have no objection but it doesn't look like RFC 7807 is a
good fir for that.

Mark

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Tomcat mod_jk rpm-build for CentOS-8 - exit with error.

2020-07-06 Thread Klaus Tachtler

Hi,

I'm trying to build a rpm package for CentOS-8 for mod_jk with the  
latest version 1.2.48. While building the rpm package, following error  
occurs:



- %< -

...
make[1]: Entering directory  
'/root/rpmbuild/BUILD/tomcat-connectors-1.2.48-src/native/apache-2.0'
/usr/lib64/apr-1/build/libtool --silent --mode=link gcc  
-I/usr/include/httpd -O2 -g -pipe -Wall -Werror=format-security  
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions  
-fstack-protector-strong -grecord-gcc-switches  
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic  
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  
-DHAVE_CONFIG_H -DUSE_APACHE_MD5 -I../common -I ../common -DLINUX  
-D_REENTRANT -D_GNU_SOURCE -O2 -g -pipe -Wall -Werror=format-security  
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions  
-fstack-protector-strong -grecord-gcc-switches  
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic  
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  
-pthread -DHAVE_APR  -I/usr/include/apr-1 -I/usr/include/apr-1 -O2 -g  
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2  
-Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong  
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic  
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  
-DHAVE_CONFIG_H -O2 -g -pipe -Wall -Werror=format-security  
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions  
-fstack-protector-strong -grecord-gcc-switches  
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1  
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic  
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection  
-I/usr/include/apr-1  -Wl,-z,relro,-z,now -Wl,-z,relro -Wl,-z,now  
-Wl,-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -o mod_jk.la -module  
-rpath /usr/lib64/httpd/modules -avoid-version mod_jk.lo  
../common/jk_ajp12_worker.lo ../common/jk_connect.lo  
../common/jk_msg_buff.lo ../common/jk_util.lo ../common/jk_ajp13.lo  
../common/jk_pool.lo ../common/jk_worker.lo  
../common/jk_ajp13_worker.lo ../common/jk_lb_worker.lo  
../common/jk_sockbuf.lo ../common/jk_map.lo  
../common/jk_uri_worker_map.lo ../common/jk_ajp14.lo  
../common/jk_ajp14_worker.lo ../common/jk_md5.lo ../common/jk_shm.lo  
../common/jk_ajp_common.lo ../common/jk_context.lo ../common/jk_url.lo  
../common/jk_status.lo
/usr/bin/ld: unrecognized option  
'-specs=/usr/lib/rpm/redhat/redhat-hardened-ld'

/usr/bin/ld: use the --help option for usage information
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:83: mod_jk.la] Error 1
make[1]: Leaving directory  
'/root/rpmbuild/BUILD/tomcat-connectors-1.2.48-src/native/apache-2.0'

make: *** [Makefile:470: all-recursive] Error 1
error: Bad exit status from /var/tmp/rpm-tmp.O4kRZI (%build)

- >% -


Any ideas how can I solve that problem?


Thank you in advance!
Klaus.

--

---
e-Mail  : kl...@tachtler.net
Homepage: https://www.tachtler.net
DokuWiki: https://dokuwiki.tachtler.net
---

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Description: Öffentlicher PGP-Schlüssel

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Re: Add custom Authenticator in context.xml

2020-07-06 Thread Mark Thomas
On 04/07/2020 19:54, Thomas Meyer wrote:
> Hi,
> 
> a while ago I did write a little POC of how to add a custom
> authenticator scheme to tomcat.
> 
> this is what I did come up with:
> https://github.com/thomasmey/BearerTokenAuthenticator
> 
> It's rather complicated solution!
> Is there an more easy solution to add a custom authenticator scheme to a 
> Context/context.xml? 

How about:

1. Extract the Authenticators.properties file from catalina.jar
   (or from source)
2. Edit it to reference the custom Authenticator
3. Place it at $CATALINA_BASE/lib/org/apache/catalina/startup
4. Add the JAR with the custom authenticator to $CATALINA_BASE/lib

which would make it generally available to use in WEB-INF/web.xml

Or

1. Add it directly to context.xml as:


   


which you would need to do for each app that wants to use it (or set it
in the global web.xml for all apps).

Mark

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Re: Problem with JarScanFilter, maybe a bug?

2020-07-06 Thread Mark Thomas
On 06/07/2020 12:25, Mark Thomas wrote:
> On 03/07/2020 13:40, Vitor Medina Cruz wrote:
>> On Thu, Jul 2, 2020 at 11:21 AM Mark Thomas  wrote:
>>
>>> On 02/07/2020 14:14, Vitor Medina Cruz wrote:
 On Wed, Jul 1, 2020 at 6:48 PM Mark Thomas  wrote:
>>>
>>> 
>>>
> @WebFiler, @WebListener and @WebServlet are deployment annotations so
> scanning for these is controlled by the JarScanner.
>
> If an SCI has an @HandlesTypes annotation then all JARs that are
> potential SCI sources will be scanned for matches. To put it another
> way, the JarScanner configuration does NOT control the search for
> @HandlesTypes matches. Any JAR eligible to provide an SCI will be
> scanned for @HandlesTypes. Those JARs are controlled by
>>> 
>

 Ok, and if a jar doesn't provide a web-fragment name? In this old post(

>>> http://tomcat.10.x6.nabble.com/Why-does-absolute-ordering-in-web-xml-without-others-kill-classpath-scanning-td5029985.html
>>> )
 it is said :

 "Tomcat will give these a name equal to the name of the JAR file so you
>>> can
 use it in ordering. That is a Tomcat specific feature."

 This is/holds true? I tried with no success
>>>
>>> It should do. So for foobar-0.3.jar the name should be "foobar-0.3.jar"
>>>
>>>
>> Don't work... :( both in Tomcat 8.5.56 and 9.0.36 I got a "Used a wrong
>> fragment name [flow-server-2.2.1.jar] at web.xml absolute-ordering tag"
> 
> Hmm. Let me look into what is going on here...

My memory and the comment from 2015 were incorrect. It is the full URL
that is used rather than just the name.

While the JAR name should be unique within WEB-INF/lib, the JAR scanning
extends outside of that to include CATALINA_BASE/lib and potentially the
the bootstrap class path. Duplicates can trigger deployment failure -
hence the more cautious approach.

As an example, this is the URL on my system (taken from Tomcat 10.0.x
but the code should be the same in 9.0.x and 8.5.x):

file:/home/mark/repos/asf-tomcat-10.0.x/output/build/webapps/examples/WEB-INF/lib/taglibs-standard-impl-1.2.5-migrated-0.0.1.jar

Rather long for a fragment but it ensures uniqueness.

Mark

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Re: Problem with JarScanFilter, maybe a bug?

2020-07-06 Thread Mark Thomas
On 03/07/2020 13:40, Vitor Medina Cruz wrote:
> On Thu, Jul 2, 2020 at 11:21 AM Mark Thomas  wrote:
> 
>> On 02/07/2020 14:14, Vitor Medina Cruz wrote:
>>> On Wed, Jul 1, 2020 at 6:48 PM Mark Thomas  wrote:
>>
>> 
>>
 @WebFiler, @WebListener and @WebServlet are deployment annotations so
 scanning for these is controlled by the JarScanner.

 If an SCI has an @HandlesTypes annotation then all JARs that are
 potential SCI sources will be scanned for matches. To put it another
 way, the JarScanner configuration does NOT control the search for
 @HandlesTypes matches. Any JAR eligible to provide an SCI will be
 scanned for @HandlesTypes. Those JARs are controlled by
>> 

>>>
>>> Ok, and if a jar doesn't provide a web-fragment name? In this old post(
>>>
>> http://tomcat.10.x6.nabble.com/Why-does-absolute-ordering-in-web-xml-without-others-kill-classpath-scanning-td5029985.html
>> )
>>> it is said :
>>>
>>> "Tomcat will give these a name equal to the name of the JAR file so you
>> can
>>> use it in ordering. That is a Tomcat specific feature."
>>>
>>> This is/holds true? I tried with no success
>>
>> It should do. So for foobar-0.3.jar the name should be "foobar-0.3.jar"
>>
>>
> Don't work... :( both in Tomcat 8.5.56 and 9.0.36 I got a "Used a wrong
> fragment name [flow-server-2.2.1.jar] at web.xml absolute-ordering tag"

Hmm. Let me look into what is going on here...

Mark

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