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| Author |
how does windows find java.exe?
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| Martin 2007-06-26, 10:10 pm |
| How does windows find java.exe if I type "java" in the command line
and if java.exe is not in the path?
I know that there is a registry key HKEY_LOCAL_MACHINE\SOFTWARE
\JavaSoft\Java Runtime Environment but I guess windows does not know
about it.
JMS
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| Thomas Fritsch 2007-06-26, 10:10 pm |
| Martin wrote:
> How does windows find java.exe if I type "java" in the command line
> and if java.exe is not in the path?
I bet java.exe *is* in your path.
On my system Java-setup has installed a copy of java.exe in directory
"C:\windows\system32\", and "C:\windows\system32\" is part of the PATH
environment variable.
>
> I know that there is a registry key HKEY_LOCAL_MACHINE\SOFTWARE
> \JavaSoft\Java Runtime Environment but I guess windows does not know
> about it.
--
Thomas
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| Roedy Green 2007-06-26, 10:10 pm |
| On Tue, 26 Jun 2007 07:09:41 -0700, Martin
<EdkIlhKpnBbr@spammotel.com> wrote, quoted or indirectly quoted
someone who said :
>How does windows find java.exe if I type "java" in the command line
>and if java.exe is not in the path?
>
>I know that there is a registry key HKEY_LOCAL_MACHINE\SOFTWARE
>\JavaSoft\Java Runtime Environment but I guess windows does not know
>about it.
There is a way of putting any file no matter where it is, on the path
by creating a registry entry. See
http://mindprod.com/jgloss/registry.html
However, that is not how Sun did it.
Further, they did not add the JRE path to the execution path.
Here is the trick. They place a spare copy of java.exe in
C:\Windows\System32\java.exe
which IS on the path. It starts up, looks in the registry to figure
out the official java.exe. then starts that.
See http://mindprod.com/jgloss/registry.html
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
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| Malcolm Dew-Jones 2007-06-26, 10:10 pm |
| Roedy Green (see_website@mindprod.com.invalid) wrote:
: There is a way of putting any file no matter where it is, on the path
: by creating a registry entry. See
: http://mindprod.com/jgloss/registry.html
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Wi
ndows\CurrentVersion\App Paths
but I don't think that is quite the same putting it on the path.
The registry entry makes them visible to the START command, as in
C:> START program-not-in-PATH-but-is-in-REGISTRY.exe
But if you simply type the name of a command as in
C:> PROGRAM.exe
then it must be either in the current directory or in a directory listed
in the PATH environment variable. (Though some entries in the registry do
control which directories are listed in each user's PATH variable.)
$0.10
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| Roedy Green 2007-06-27, 8:10 am |
| On 26 Jun 2007 14:22:42 -0800, yf110@vtn1.victoria.tc.ca (Malcolm
Dew-Jones) wrote, quoted or indirectly quoted someone who said :
> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Wi
ndows\CurrentVersion\App Paths
>
>but I don't think that is quite the same putting it on the path.
>
>The registry entry makes them visible to the START command, as in
>
> C:> START program-not-in-PATH-but-is-in-REGISTRY.exe
>
>
>But if you simply type the name of a command as in
>
> C:> PROGRAM.exe
>
>then it must be either in the current directory or in a directory listed
>in the PATH environment variable. (Though some entries in the registry do
>control which directories are listed in each user's PATH variable.
IIRC I have added programs to the App Paths and then I can invoke them
with just xxxx on the command line in 4NT. Don't recall about
xxxx.exe.
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
| |
| Martin 2007-06-27, 8:10 am |
| > Here is the trick. They place a spare copy of java.exe in
> C:\Windows\System32\java.exe
Oh....simply and dirty!
Thanks!
JMS
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| Malcolm Dew-Jones 2007-06-27, 10:09 pm |
| Roedy Green (see_website@mindprod.com.invalid) wrote:
: On 26 Jun 2007 14:22:42 -0800, yf110@vtn1.victoria.tc.ca (Malcolm
: Dew-Jones) wrote, quoted or indirectly quoted someone who said :
: > HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Wi
ndows\CurrentVersion\App Paths
: >
: >but I don't think that is quite the same putting it on the path.
: >
: >The registry entry makes them visible to the START command, as in
: >
: > C:> START program-not-in-PATH-but-is-in-REGISTRY.exe
: >
: >
: >But if you simply type the name of a command as in
: >
: > C:> PROGRAM.exe
: >
: >then it must be either in the current directory or in a directory listed
: >in the PATH environment variable. (Though some entries in the registry do
: >control which directories are listed in each user's PATH variable.
: IIRC I have added programs to the App Paths and then I can invoke them
: with just xxxx on the command line in 4NT. Don't recall about
: xxxx.exe.
This is XP, and so far it still doesn't work for me, I can't run programs
already listed there (except using START) with or without the extension.
The existing entries are keys, so I added a string value directly at that
level, but that didn't work either, even after logout and login.
Perhaps there's some other setting that must be toggled to enable this.
| |
| Roedy Green 2007-06-28, 8:09 am |
| On Wed, 27 Jun 2007 02:06:48 -0700, Martin
<EdkIlhKpnBbr@spammotel.com> wrote, quoted or indirectly quoted
someone who said :
>
>Oh....simply and dirty!
>Thanks!
Sun is going to use methods easy to port with minimal changes to
different OS's, not necessarily the slickest for any given OS.
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
| |
| Roedy Green 2007-06-28, 10:09 pm |
| On 27 Jun 2007 09:26:36 -0800, yf110@vtn1.victoria.tc.ca (Malcolm
Dew-Jones) wrote, quoted or indirectly quoted someone who said :
>This is XP, and so far it still doesn't work for me, I can't run programs
>already listed there (except using START) with or without the extension.
>
>The existing entries are keys, so I added a string value directly at that
>level, but that didn't work either, even after logout and login.
>
>Perhaps there's some other setting that must be toggled to enable this.
I have done some research on this. It turns out we are both right in
our observations.
See http://mindprod.com/jgloss/registry.html#AUXPATH
You might also find interesting:
http://mindprod.com/jgloss/registry.html#JAVAFIND
on how Java finds its various executables.
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
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