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Posted to users@tomcat.apache.org by Garret Wilson <ga...@globalmentor.com> on 2019/04/21 14:53:33 UTC
no temp directory creation wanted when embedding Tomcat
As I mentioned in other emails, I am embedding Tomcat 9 (with OpenJDK 11
on Windows 10) to serve static files from `/foo/bar`. Currently I'm not
supporting Java webapps. I'm not supporting JSP. I just want to serve
static files.
From your help in another thread, I called the magic
"gets-but-really-creates-a-connection" method and got it working.
But now I realize Tomcat is creating this directory structur inside the
"base dir" I specified:
tomcat.8080/work/Tomcat/localhost/ROOT
I don't need this directory. I don't want this directory created. How do
I tell Tomcat not to create no danged directories?
Garret
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Re: no temp directory creation wanted when embedding Tomcat
Posted by "Mark H. Wood" <mw...@iupui.edu>.
It seems to me that the problem may be, that you are trying to use
Tomcat but cut away most of its raison d'etre. Asking Google for
"embedded web server java" will give you a lot of other possibilities
to explore, some of them extremely simple.
--
Mark H. Wood
Lead Technology Analyst
University Library
Indiana University - Purdue University Indianapolis
755 W. Michigan Street
Indianapolis, IN 46202
317-274-0749
www.ulib.iupui.edu
Re: no temp directory creation wanted when embedding Tomcat
Posted by Garret Wilson <ga...@globalmentor.com>.
On 4/24/2019 12:01 AM, Mark Thomas wrote:
> If you don't want the baggage associated with a Servlet container it
> might be worth looking at what other solutions are available.
Thanks for being forthright here, Mark. (Mark Wood also suggested the
same thing separately.)
Indeed I have used Jetty in the past for embedding, and in fact that was
my first thought for this project. But because I use Tomcat for my web
applications, I thought maybe I had been ignoring Tomcat on this front.
So I went the extra step of trying Tomcat for embedding, thinking maybe
it would give me an opportunity to contribute back to this great project
as well.
I guess I had assumed that Tomcat was "a great server that supports
servlet technology", when in fact it is "a great servlet container that
supports serving static files through a default servlet".
I'll think more about this. I have a question about dynamic MIME type
determination, but I'll ask it separately.
Garret
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Mark Thomas <ma...@apache.org>.
On 23/04/2019 21:46, Garret Wilson wrote:
> On 4/22/2019 7:58 AM, Mark Thomas wrote:
>> On 21/04/2019 15:53, Garret Wilson wrote:
>>> …
>>> But now I realize Tomcat is creating this directory structur inside the
>>> "base dir" I specified:
>>>
>>> tomcat.8080/work/Tomcat/localhost/ROOT
>>>
>>> I don't need this directory. I don't want this directory created. How do
>>> I tell Tomcat not to create no danged directories?
>> The Servlet specification requires (see section 4.8.1 of the Servlet 4.0
>> spec) that Tomcat provides a private temporary directory for each
>> servlet context (web application).
>
>
> I have have several reactions.
>
> 1. The first is, OK, so the servlet spec requires that the servlet
> container expose a temporary directory. Tomcat can't provide a temporary
> directory to the consumer unless it has a temporary directory, so it's
> reasonable that it creates one.
>
> 2. But so far nothing has been stored in this directory, so it's
> completely unused. I see also in the `Tomcat` class the comment, "lazy
> init for the temp dir - only when a JSP is compiled or get temp dir is
> called we need to create it. This will avoid the need for the baseDir".
> It sounds like you're lazily creating the JSP temporary directory, so
> why can't we do the same for the context temporary directory, which may
> never be used (and frankly probably won't be used in many applications)?
> But OK, that's a quibble; my other thoughts are more pressing.
>
> 3. Since the temporary working directory is on a per-context basis, and
> I've only set the "basedir" for the entire `Tomcat` instance, Tomcat
> must be determining a default temporary directory for the context.
> Surely I'm allowed to explicitly specify a temporary directory on a
> per-context basis, but I sure can't find it. The `StandardContext` seems
> to equate the "temporary directory" with the "work directory". Are they
> really the same? If so, I suppose I can just call
> `((StandardContext)context).setWorkDir(String)`?
>
>
>> The best you can do is specify an absolute path that already exists for
>> the Context's work directory. It doesn't need to be writeable. If you
>> are using it for multiple web applications you probably don't want it to
>> be writeable.
>
>
> Ah, OK—I had read that response earlier, but didn't understand exactly
> what it meant until I investigated and wrote #2 above. So I guess I was
> right: I need to call`((StandardContext)context).setWorkDir(String)`.
>
> 4. But all this "temporary directory requirement" business is for
> servlet containers. I started out just wanted to embed Tomcat to serve
> static files; I don't (yet? ever?) need a servlet container for this
> particular application. So how can I use Tomcat to serve static files
> without bringing in the requirements of a servlet container?
>
> Maybe the answer is that Tomcat serves files by using a
> static-file-serving servlet, which in turn requires me to use Tomcat as
> a servlet container even for serving static files, which in turn
> requires me to have a temporary directory I don't want or need.
>
> I suppose that's just the way it is. This is not so much a complaint as
> a desire to confirm I understand correctly how things stands. (OK, it's
> a teeny-tiny complaint, too.)
Your reasoning above is correct.
If you don't want the baggage associated with a Servlet container it
might be worth looking at what other solutions are available.
Mark
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Garret,
On 4/23/19 16:46, Garret Wilson wrote:
> On 4/22/2019 7:58 AM, Mark Thomas wrote:
>> On 21/04/2019 15:53, Garret Wilson wrote:
>>> … But now I realize Tomcat is creating this directory structur
>>> inside the "base dir" I specified:
>>>
>>> tomcat.8080/work/Tomcat/localhost/ROOT
>>>
>>> I don't need this directory. I don't want this directory
>>> created. How do I tell Tomcat not to create no danged
>>> directories?
>> The Servlet specification requires (see section 4.8.1 of the
>> Servlet 4.0 spec) that Tomcat provides a private temporary
>> directory for each servlet context (web application).
>
>
> I have have several reactions.
>
> 1. The first is, OK, so the servlet spec requires that the servlet
> container expose a temporary directory. Tomcat can't provide a
> temporary directory to the consumer unless it has a temporary
> directory, so it's reasonable that it creates one.
>
> 2. But so far nothing has been stored in this directory, so it's
> completely unused. I see also in the `Tomcat` class the comment,
> "lazy init for the temp dir - only when a JSP is compiled or get
> temp dir is called we need to create it. This will avoid the need
> for the baseDir". It sounds like you're lazily creating the JSP
> temporary directory, so why can't we do the same for the context
> temporary directory, which may never be used (and frankly probably
> won't be used in many applications)? But OK, that's a quibble; my
> other thoughts are more pressing.
Lazy-creation of the directory cannot be accomplished simply. This is
because there is no API call to get the temp directory that will be
used by the context. Or, rather, the API call is too generic. This is
how a web application should use a temporary directory from within
e.g. a servlet:
File tmpDir = (File)
getServletContext().getAttribute(ServletContext.TEMPDIR);
File myFile = new File(tmpDir, "my.file");
// Use myFile...
The only API call to intercept would be ServletContext.getAttribute,
and we'd have to look specifically for the TEMPDIR attribute key.
This can indeed be done, at varying levels of laziness (on the part of
either the Tomcat programmer, or by the code itself to delay as long
as possible).
> 4. But all this "temporary directory requirement" business is for
> servlet containers. I started out just wanted to embed Tomcat to
> serve static files; I don't (yet? ever?) need a servlet container
> for this particular application. So how can I use Tomcat to serve
> static files without bringing in the requirements of a servlet
> container?
Tomcat is a servlet container. Just because you don't care to use it
as such doesn't mean that Tomcat should be re-architected.
> Maybe the answer is that Tomcat serves files by using a
> static-file-serving servlet
It does.
> which in turn requires me to use Tomcat as a servlet container even
> for serving static files, which in turn requires me to have a
> temporary directory I don't want or need.
Yes, but I don't believe the DefaultServlet uses the temporary
directory for anything, here. (DefaultServlet does use the temp dir,
but it only uses it for PUT operations.)
> I suppose that's just the way it is. This is not so much a
> complaint as a desire to confirm I understand correctly how things
> stands. (OK, it's a teeny-tiny complaint, too.)
- -chris
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Garret Wilson <ga...@globalmentor.com>.
On 4/23/2019 5:46 PM, Garret Wilson wrote:
> 3. Since the temporary working directory is on a per-context basis,
> and I've only set the "basedir" for the entire `Tomcat` instance,
> Tomcat must be determining a default temporary directory for the
> context. Surely I'm allowed to explicitly specify a temporary
> directory on a per-context basis, but I sure can't find it. The
> `StandardContext` seems to equate the "temporary directory" with the
> "work directory". Are they really the same? If so, I suppose I can
> just call `((StandardContext)context).setWorkDir(String)`?
I decided to just change the `Tomcat` base directory to some location.
This will let Tomcat create its own per-context temp subdirectory under
this, and it lowers the risk that I'll wind up with still other unwanted
temporary directories in my project, which is under source control.
It turns out there's another trick here as well. You have to call
`tomcat.setBaseDir()` /before/ you call the magic
`tomcat.getConnector()` (the latter of which secretly creates the
default connector). Otherwise, if the connector is created first, Tomcat
decides on its own base directory using the current working directory
and something in the form `tomcat:8080` (which is apparently why I got
that particular directory subtree in the first place).
Garret
Re: no temp directory creation wanted when embedding Tomcat
Posted by Garret Wilson <ga...@globalmentor.com>.
On 4/22/2019 7:58 AM, Mark Thomas wrote:
> On 21/04/2019 15:53, Garret Wilson wrote:
>> …
>> But now I realize Tomcat is creating this directory structur inside the
>> "base dir" I specified:
>>
>> tomcat.8080/work/Tomcat/localhost/ROOT
>>
>> I don't need this directory. I don't want this directory created. How do
>> I tell Tomcat not to create no danged directories?
> The Servlet specification requires (see section 4.8.1 of the Servlet 4.0
> spec) that Tomcat provides a private temporary directory for each
> servlet context (web application).
I have have several reactions.
1. The first is, OK, so the servlet spec requires that the servlet
container expose a temporary directory. Tomcat can't provide a temporary
directory to the consumer unless it has a temporary directory, so it's
reasonable that it creates one.
2. But so far nothing has been stored in this directory, so it's
completely unused. I see also in the `Tomcat` class the comment, "lazy
init for the temp dir - only when a JSP is compiled or get temp dir is
called we need to create it. This will avoid the need for the baseDir".
It sounds like you're lazily creating the JSP temporary directory, so
why can't we do the same for the context temporary directory, which may
never be used (and frankly probably won't be used in many applications)?
But OK, that's a quibble; my other thoughts are more pressing.
3. Since the temporary working directory is on a per-context basis, and
I've only set the "basedir" for the entire `Tomcat` instance, Tomcat
must be determining a default temporary directory for the context.
Surely I'm allowed to explicitly specify a temporary directory on a
per-context basis, but I sure can't find it. The `StandardContext` seems
to equate the "temporary directory" with the "work directory". Are they
really the same? If so, I suppose I can just call
`((StandardContext)context).setWorkDir(String)`?
> The best you can do is specify an absolute path that already exists for
> the Context's work directory. It doesn't need to be writeable. If you
> are using it for multiple web applications you probably don't want it to
> be writeable.
Ah, OK—I had read that response earlier, but didn't understand exactly
what it meant until I investigated and wrote #2 above. So I guess I was
right: I need to call`((StandardContext)context).setWorkDir(String)`.
4. But all this "temporary directory requirement" business is for
servlet containers. I started out just wanted to embed Tomcat to serve
static files; I don't (yet? ever?) need a servlet container for this
particular application. So how can I use Tomcat to serve static files
without bringing in the requirements of a servlet container?
Maybe the answer is that Tomcat serves files by using a
static-file-serving servlet, which in turn requires me to use Tomcat as
a servlet container even for serving static files, which in turn
requires me to have a temporary directory I don't want or need.
I suppose that's just the way it is. This is not so much a complaint as
a desire to confirm I understand correctly how things stands. (OK, it's
a teeny-tiny complaint, too.)
Garret
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Mark Thomas <ma...@apache.org>.
On 22/04/2019 14:37, Christopher Schultz wrote:
> Garret,
>
> On 4/22/19 09:36, Christopher Schultz wrote:
>> Mark,
>
>> On 4/22/19 06:58, Mark Thomas wrote:
>>> On 21/04/2019 15:53, Garret Wilson wrote:
>>>> As I mentioned in other emails, I am embedding Tomcat 9 (with
>>>> OpenJDK 11 on Windows 10) to serve static files from
>>>> `/foo/bar`. Currently I'm not supporting Java webapps. I'm not
>>>> supporting JSP. I just want to serve static files.
>>>>
>>>> From your help in another thread, I called the magic
>>>> "gets-but-really-creates-a-connection" method and got it
>>>> working.
>>>>
>>>> But now I realize Tomcat is creating this directory structur
>>>> inside the "base dir" I specified:
>>>>
>>>> tomcat.8080/work/Tomcat/localhost/ROOT
>>>>
>>>> I don't need this directory. I don't want this directory
>>>> created. How do I tell Tomcat not to create no danged
>>>> directories?
>
>>> The Servlet specification requires (see section 4.8.1 of the
>>> Servlet 4.0 spec) that Tomcat provides a private temporary
>>> directory for each servlet context (web application).
>
>>> The best you can do is specify an absolute path that already
>>> exists for the Context's work directory. It doesn't need to be
>>> writeable. If you are using it for multiple web applications you
>>> probably don't want it to be writeable.
>
>> Could a <Resource> be used to map a virtual directory for the work
>> directory? For example, trick Tomcat into using a "directory"
>> within a JAR file or something as the "work" directory? Obviously,
>> it will fail if Tomcat tries to write a temporary file, but that's
>> kind of the point.
No. Tomcat doesn't use the web app resources infrastructure to find the
work directory.
>> George, you can always use the "document-root" (to use httpd's
>> parlance) as the work directory, since it also must exist.
>
> ^^^^ I meant Garret. Sorry, I had just read a message posted by George
> Stanchev and his name was on my mind.
I wouldn't recommend that in the general case. I'd worry about conflicts
and/or stuff getting deleted by accident.
Mark
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Garret,
On 4/22/19 09:36, Christopher Schultz wrote:
> Mark,
>
> On 4/22/19 06:58, Mark Thomas wrote:
>> On 21/04/2019 15:53, Garret Wilson wrote:
>>> As I mentioned in other emails, I am embedding Tomcat 9 (with
>>> OpenJDK 11 on Windows 10) to serve static files from
>>> `/foo/bar`. Currently I'm not supporting Java webapps. I'm not
>>> supporting JSP. I just want to serve static files.
>>>
>>> From your help in another thread, I called the magic
>>> "gets-but-really-creates-a-connection" method and got it
>>> working.
>>>
>>> But now I realize Tomcat is creating this directory structur
>>> inside the "base dir" I specified:
>>>
>>> tomcat.8080/work/Tomcat/localhost/ROOT
>>>
>>> I don't need this directory. I don't want this directory
>>> created. How do I tell Tomcat not to create no danged
>>> directories?
>
>> The Servlet specification requires (see section 4.8.1 of the
>> Servlet 4.0 spec) that Tomcat provides a private temporary
>> directory for each servlet context (web application).
>
>> The best you can do is specify an absolute path that already
>> exists for the Context's work directory. It doesn't need to be
>> writeable. If you are using it for multiple web applications you
>> probably don't want it to be writeable.
>
> Could a <Resource> be used to map a virtual directory for the work
> directory? For example, trick Tomcat into using a "directory"
> within a JAR file or something as the "work" directory? Obviously,
> it will fail if Tomcat tries to write a temporary file, but that's
> kind of the point.
>
> George, you can always use the "document-root" (to use httpd's
> parlance) as the work directory, since it also must exist.
^^^^ I meant Garret. Sorry, I had just read a message posted by George
Stanchev and his name was on my mind.
- -chris
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Mark,
On 4/22/19 06:58, Mark Thomas wrote:
> On 21/04/2019 15:53, Garret Wilson wrote:
>> As I mentioned in other emails, I am embedding Tomcat 9 (with
>> OpenJDK 11 on Windows 10) to serve static files from `/foo/bar`.
>> Currently I'm not supporting Java webapps. I'm not supporting
>> JSP. I just want to serve static files.
>>
>> From your help in another thread, I called the magic
>> "gets-but-really-creates-a-connection" method and got it
>> working.
>>
>> But now I realize Tomcat is creating this directory structur
>> inside the "base dir" I specified:
>>
>> tomcat.8080/work/Tomcat/localhost/ROOT
>>
>> I don't need this directory. I don't want this directory created.
>> How do I tell Tomcat not to create no danged directories?
>
> The Servlet specification requires (see section 4.8.1 of the
> Servlet 4.0 spec) that Tomcat provides a private temporary
> directory for each servlet context (web application).
>
> The best you can do is specify an absolute path that already exists
> for the Context's work directory. It doesn't need to be writeable.
> If you are using it for multiple web applications you probably
> don't want it to be writeable.
Could a <Resource> be used to map a virtual directory for the work
directory? For example, trick Tomcat into using a "directory" within a
JAR file or something as the "work" directory? Obviously, it will fail
if Tomcat tries to write a temporary file, but that's kind of the point.
George, you can always use the "document-root" (to use httpd's
parlance) as the work directory, since it also must exist.
- -chris
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Re: no temp directory creation wanted when embedding Tomcat
Posted by Mark Thomas <ma...@apache.org>.
On 21/04/2019 15:53, Garret Wilson wrote:
> As I mentioned in other emails, I am embedding Tomcat 9 (with OpenJDK 11
> on Windows 10) to serve static files from `/foo/bar`. Currently I'm not
> supporting Java webapps. I'm not supporting JSP. I just want to serve
> static files.
>
> From your help in another thread, I called the magic
> "gets-but-really-creates-a-connection" method and got it working.
>
> But now I realize Tomcat is creating this directory structur inside the
> "base dir" I specified:
>
> tomcat.8080/work/Tomcat/localhost/ROOT
>
> I don't need this directory. I don't want this directory created. How do
> I tell Tomcat not to create no danged directories?
The Servlet specification requires (see section 4.8.1 of the Servlet 4.0
spec) that Tomcat provides a private temporary directory for each
servlet context (web application).
The best you can do is specify an absolute path that already exists for
the Context's work directory. It doesn't need to be writeable. If you
are using it for multiple web applications you probably don't want it to
be writeable.
Mark
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