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Posted to users@tomcat.apache.org by Bobi St <te...@yahoo.de> on 2011/08/01 23:27:23 UTC
Re: Tomcat 7: Why is JDK needed ?
Thanks to all for the replies.
So we dont need JDK_HOME, and the message
>>>>> Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
>>>>> At least one of these environment variable is needed to run this program
is obsolete.
Best regards,
From: Bobi St
Date: Thu, 21 Jul 2011 19:58:53
why is Why is JDK needed also for Tomcat 7 ? Does it use a compiler, or why not simply using for example jre6 ?!?
I have to install always extra JDK because of it ...
> Von: Justin Randall
> 21. Juli, 2011 21:01 Uhr
> It uses the Java compiler for activities such as compiling JSPs into Servlets into Java class files.
> All versions of Tomcat require the JDK.
>> I see. This makes sense.
>> P.s. On the other hand the ---or--- in the error message is misleading: neither JDK_HOME ---nor--- JRE_HOME is set...
>>> Von: Konstantin Kolinko
>>> 21. Juli, 2011 21:09 Uhr
>>> Wrong. All currently supported versions (5.5, 6.0, 7.0)
>>> do not use JDK compiler by default even if it is available.
>>> See documentation for details.
>>> All of them can run with JRE.
>>> It is good to have JDK around because of additional utilities like jvisualvm etc.
>>>> Bobi St
>>>> 22. Juli, 2011 13:15 Uhr
>>>> So, I'm talking about Tomcat 7. According to some description, it >>>> doesn't need JDK anymore. For this reason under Windows (7) I >>>> didn't set it at the beginning (neither did I install it), so the >>>> error came: no JDK nor JRE was set (although JRE was set). I tried >>>> to set JDK_HOME to jre6 as well, but the same error message.
>>>> Only after installing (the latest) JDK, and setting JDK_HOME >>>> towards it, I could start Tomcat with the startup.bat
>>>>> chris derham
>>>>> Freitag, 22. Juli, 2011 14:06 Uhr
>>>>> Windows 7
>>>>> Tomcat 7.0.19
>>>>> java -version
>>>>> java version "1.6.0_25"
>>>>> Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
>>>>> Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode)
>>>>> Open command prompt, navigate to <catalina_home>\bin. If JAVA_HOME is not
>>>>> set, tomcat complains no JAVA_HOME. If set to a JRE, complains should point
>>>>> to JDK. Output shown below
>>>>> D:\apps\tomcat\apache-tomcat-7.0.19\bin>set JAVA_HOME=
>>>>> D:\apps\tomcat\apache-tomcat-7.0.19\bin>catalina.bat run
>>>>> Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
>>>>> At least one of these environment variable is needed to run this program
>>>>> D:\apps\tomcat\apache-tomcat-7.0.19\bin>set JAVA_HOME=C:\Program
>>>>> Files\Java\jre6
>>>>> D:\apps\tomcat\apache-tomcat-7.0.19\bin>catalina.bat run
>>>>> The JAVA_HOME environment variable is not defined correctly
>>>>> This environment variable is needed to run this program
>>>>> NB: JAVA_HOME should point to a JDK not a JRE
>>>>>> Mark Thomas
>>>>>> 22. Juli, 2011 14:13 Uhr
>>>>>> That is wrong. JAVA_HOME can't point to a JRE. You should be using JRE_HOME here.
>>>>>>> Ognjen Blagojevic
>>>>>>> 22. Juli, 2011 14:16 Uhr
>>>>>>> C:\apps\apache-tomcat-7.0.11\bin>set JRE_HOME=
>>>>>>> C:\apps\apache-tomcat-7.0.11\bin>set JAVA_HOME=
>>>>>>> C:\apps\apache-tomcat-7.0.11\bin>startup.bat
>>>>>>> Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
>>>>>>> At least one of these environment variable is needed to run this program
>>>>>>> C:\apps\apache-tomcat-7.0.11\bin>set JRE_HOME=C:\Program Files\Java\jre6\
>>>>>>> C:\apps\apache-tomcat-7.0.11\bin>startup.bat
Re: Tomcat 7: Why is JDK needed ?
Posted by Bobi St <te...@yahoo.de>.
Hallo,
--- Christopher Schultz <ch...@christopherschultz.net> schrieb am Di, 2.8.2011:
>>> The message is correct as stated; when JAVA_HOME is used, it
>
>> *must* point to a JDK. If you want a specific JRE, you must set
>
>
> JRE_HOME, not JAVA_HOME.
>
>
>
>
Well, if JDK is not needed anymore, why bother setting JAVA_HOME, why
>
>
is it mentioned at all ?
>
Because you have a choice: JRE or JDK. Some people have both. Some only
>
have one. Hence the choice.
Well, I have to accept this opinion. But secretly I would still think that is an obsolete message :)
>
>
>
> Why not only to set JRE_HOME ?!?
>
>
>
>
>
>
Sorry, I can't parse that question.
>
>
>
>
I meant, if JDK is not needed anymore, why at all mentioning JAVA_HOME ?
>
>
It is not /required/, but it is an option
Thanks .
Re: Tomcat 7: Why is JDK needed ?
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Bobi,
On 8/1/2011 7:18 PM, Bobi St wrote:
>> The message is correct as stated; when JAVA_HOME is used, it
>> *must* point to a JDK. If you want a specific JRE, you must set
>> JRE_HOME, not JAVA_HOME.
>
> Well, if JDK is not needed anymore, why bother setting JAVA_HOME, why
> is it mentioned at all ?
Because you have a choice: JRE or JDK. Some people have both. Some only
have one. Hence the choice.
>> Why not only to set JRE_HOME ?!?
>
> Sorry, I can't parse that question.
>
> I meant, if JDK is not needed anymore, why at all mentioning
> JAVA_HOME ?
It is not /required/, but it is an option.
- -chris
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Re: Tomcat 7: Why is JDK needed ?
Posted by David Kerber <dc...@verizon.net>.
On 8/1/2011 7:18 PM, Bobi St wrote:
>
> --- Caldarale, Charles R<Ch...@unisys.com> schrieb am Mo, 1.8.2011:
>
>> it is obsolete in a way, because setting JAVA_HOME to JRE
>> gives the message : "NB: JAVA_HOME should point to a JDK
>> not a JRE".
> The message is correct as stated; when JAVA_HOME is used, it *must* point to a JDK. If you want a specific JRE, you must set JRE_HOME, not JAVA_HOME. If
> ::: Well, if JDK is not needed anymore, why bother setting JAVA_HOME, why is it mentioned at all ?
>
>> Why not only to set JRE_HOME ?!?
> Sorry, I can't parse that question.
>
> ::: I meant, if JDK is not needed anymore, why at all mentioning JAVA_HOME ?
>
>> the messaging seems at least to me a little confusing.
> Please explain why. As far as I can see, you set JAVA_HOME to a JRE, which is invalid; once you've done that, nothing useful can result.
>
>
> ::: Its all about JDK, if JDK is not needed anymore, why at all mentioning JAVA_HOME to JDK ?
>
My guess would be backwards compatibility. Also, there may be a reason
that somebody might want to use a JDK instead of a JRE.
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RE: Tomcat 7: Why is JDK needed ?
Posted by Bobi St <te...@yahoo.de>.
--- Caldarale, Charles R <Ch...@unisys.com> schrieb am Mo, 1.8.2011:
> it is obsolete in a way, because setting JAVA_HOME to JRE
> gives the message : "NB: JAVA_HOME should point to a JDK
> not a JRE".
The message is correct as stated; when JAVA_HOME is used, it *must* point to a JDK. If you want a specific JRE, you must set JRE_HOME, not JAVA_HOME. If
::: Well, if JDK is not needed anymore, why bother setting JAVA_HOME, why is it mentioned at all ?
> Why not only to set JRE_HOME ?!?
Sorry, I can't parse that question.
::: I meant, if JDK is not needed anymore, why at all mentioning JAVA_HOME ?
> the messaging seems at least to me a little confusing.
Please explain why. As far as I can see, you set JAVA_HOME to a JRE, which is invalid; once you've done that, nothing useful can result.
::: Its all about JDK, if JDK is not needed anymore, why at all mentioning JAVA_HOME to JDK ?
RE: Tomcat 7: Why is JDK needed ?
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Bobi St [mailto:temporarybobi@yahoo.de]
> Subject: Re: Tomcat 7: Why is JDK needed ?
> it is obsolete in a way, because setting JAVA_HOME to JRE
> gives the message : "NB: JAVA_HOME should point to a JDK
> not a JRE".
The message is correct as stated; when JAVA_HOME is used, it *must* point to a JDK. If you want a specific JRE, you must set JRE_HOME, not JAVA_HOME. If you set neither JAVA_HOME nor JRE_HOME, the startup scripts try to find a JVM, and set one of the variables for you.
> Why not only to set JRE_HOME ?!?
Sorry, I can't parse that question.
> Pointing at JDK from JAVA_HOME works however.
As it should. Setting JRE_HOME to the location of a JRE also works.
> the messaging seems at least to me a little confusing.
Please explain why. As far as I can see, you set JAVA_HOME to a JRE, which is invalid; once you've done that, nothing useful can result.
- Chuck
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Re: Tomcat 7: Why is JDK needed ?
Posted by Bobi St <te...@yahoo.de>.
Hi,
--- Mark Thomas <ma...@apache.org> schrieb am Mo, 1.8.2011:
On 01/08/2011 22:27, Bobi St wrote:
> So we dont need JDK_HOME, and the message
Correct.
>>>>>> Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
>>>>>> At least one of these environment variable is needed to run this program
> is obsolete.
Wrong. The message is correct-------------------------------------------------------Well, it is obsolete in a way, because setting JAVA_HOME to JRE gives the message : "NB: JAVA_HOME should point to a JDK not a JRE". Why not only to set JRE_HOME ?!? Pointing at JDK from JAVA_HOME works however. ... Well, the messaging seems at least to me a little confusing.
===========================C:\apache-tomcat-7.0.8\bin>startup
Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
At least one of these environment variable is needed to run this program
D:\apache-tomcat-7.0.8\bin>set JAVA_HOME=c:\Program Files\Java\jre6
D:\apache-tomcat-7.0.8\bin>startup
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
Re: Tomcat 7: Why is JDK needed ?
Posted by Mark Thomas <ma...@apache.org>.
On 01/08/2011 22:27, Bobi St wrote:
> Thanks to all for the replies.
> So we dont need JDK_HOME, and the message
Correct.
>>>>>> Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
>>>>>> At least one of these environment variable is needed to run this program
> is obsolete.
Wrong. The message is correct.
Mark
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