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a java classpath question

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  a java classpath question zyng <xsli2@yahoo.com> - 2012-12-28 09:07 -0800
    Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-28 13:05 -0500
      Re: a java classpath question zyng <xsli2@yahoo.com> - 2012-12-28 10:44 -0800
        Re: a java classpath question zyng <xsli2@yahoo.com> - 2012-12-28 10:48 -0800
          Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-28 13:51 -0500
          Re: a java classpath question Lew <lewbloch@gmail.com> - 2012-12-28 13:16 -0800
        Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-28 13:48 -0500
    Re: a java classpath question Roedy Green <see_website@mindprod.com.invalid> - 2012-12-29 09:52 -0800
    Re: a java classpath question Roedy Green <see_website@mindprod.com.invalid> - 2012-12-30 07:53 -0800
      Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-30 15:40 -0500
    Re: a java classpath question "John L." <johnlarew@sbcglobal.net> - 2012-12-30 11:50 -0800
      Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-30 15:35 -0500
      Re: a java classpath question Martin Gregorie <martin@address-in-sig.invalid> - 2012-12-30 20:49 +0000
        Re: a java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2012-12-30 16:10 -0500
          Re: a java classpath question Martin Gregorie <martin@address-in-sig.invalid> - 2012-12-30 22:11 +0000

#20764 — a java classpath question

Hi:

My Java program is started by using somebody's shell script. Inside his script:

java -classpath his_lib/'*' Main

However, I also wish to set Java's classpath for my code to work and I am not allowed to change his script.(He: actually is a company. My program is running inside this company's main frame).

So when JVM starts, the true classpath is my_lib/'*';his_lib/'*'. Is that possible to do? 

Thank you.

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#20768

On 12/28/2012 12:07 PM, zyng wrote:
> My Java program is started by using somebody's shell script. Inside
> his script:
>
> java -classpath his_lib/'*' Main
>
> However, I also wish to set Java's classpath for my code to work and
> I am not allowed to change his script.(He: actually is a company. My
> program is running inside this company's main frame).
>
> So when JVM starts, the true classpath is my_lib/'*';his_lib/'*'. Is
> that possible to do?

No.

For that to be possible his shell script should have used
a variable that you could have set.

I would copy his shell script and modify it.

Arne

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#20769

OK. Thanks. But I can not make it work. In the script:

his_lib=/a/b
my_lib=/c/d

java -classpath $his_lib/'*' Main    //old script and it works

java -classpath $his_lib/'*';$my_lib/'*' Main  //not working, saying /c/d/*: No such file or directory

Confused.

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#20770

On Friday, December 28, 2012 1:44:13 PM UTC-5, zyng wrote:
> OK. Thanks. But I can not make it work. In the script:
> 
> 
> 
> his_lib=/a/b
> 
> my_lib=/c/d
> 
> 
> 
> java -classpath $his_lib/'*' Main    //old script and it works
> 
> 
> 
> java -classpath $his_lib/'*';$my_lib/'*' Main  //not working, saying /c/d/*: No such file or directory
> 
> 
> 
> Confused.

Wow, this is working:
java -classpath $his_lib/'*':$my_lib/'*' Main //using ":" not ";" to separate

(Obviously, I am on Linux.)

But, this document is using ";", not ":"
http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html

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#20772

On 12/28/2012 1:48 PM, zyng wrote:
> On Friday, December 28, 2012 1:44:13 PM UTC-5, zyng wrote:
>> OK. Thanks. But I can not make it work. In the script:
>> his_lib=/a/b
>> my_lib=/c/d
>>
>> java -classpath $his_lib/'*' Main    //old script and it works
>>
>> java -classpath $his_lib/'*';$my_lib/'*' Main  //not working, saying /c/d/*: No such file or directory
>>
>> Confused.
>
> Wow, this is working:
> java -classpath $his_lib/'*':$my_lib/'*' Main //using ":" not ";" to separate
>
> (Obviously, I am on Linux.)
>
> But, this document is using ";", not ":"
> http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html
                                                        ^^^^^^^

It says Windows.

You want:
 
http://docs.oracle.com/javase/6/docs/technotes/tools/solaris/classpath.html

Arne

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#20778

zyng wrote:
> zyng wrote:
>> OK. Thanks. But I can not make it work. In the script:
> > his_lib=/a/b

Forward slash hints you might be using a *nix style system.

>> my_lib=/c/d
> 
>> java -classpath $his_lib/'*' Main    //old script and it works

"works": Meaning it picks up all JARs in that directory, yes?

> 
>> java -classpath $his_lib/'*';$my_lib/'*' Main  
>> //not working, saying /c/d/*: No such file or directory
>> Confused.
> 
> Wow, this is working:
> 
> java -classpath $his_lib/'*':$my_lib/'*' Main //using ":" not ";" to separate
> 
> (Obviously, I am on Linux.)

Obvious to whom?

> But, this document is using ";", not ":"
> 
> http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html

What was that URL again?

... windows/ ...

-- 
Lew

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#20771

On 12/28/2012 1:44 PM, zyng wrote:
> OK. Thanks. But I can not make it work. In the script:
>
> his_lib=/a/b
> my_lib=/c/d
>
> java -classpath $his_lib/'*' Main    //old script and it works
>
> java -classpath $his_lib/'*';$my_lib/'*' Main  //not working, saying /c/d/*: No such file or directory
>
> Confused.

On *nix I think classpath elements is separated by : not ;.

Arne

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#20804

On Fri, 28 Dec 2012 09:07:39 -0800 (PST), zyng <xsli2@yahoo.com>
wrote, quoted or indirectly quoted someone who said :

>However, I also wish to set Java's classpath for
> my code to work and I am not allowed to change his script.
>(He: actually is a company. My program is running inside this company's main frame).

Things to try:

1. classpath set in jar manifest.

2. custom classloader

3. setting system property (I have not tried this).

-- 
Roedy Green Canadian Mind Products http://mindprod.com
Students who hire or con others to do their homework are as foolish 
as couch potatoes who hire others to go to the gym for them. 

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#20819

On Fri, 28 Dec 2012 09:07:39 -0800 (PST), zyng <xsli2@yahoo.com>
wrote, quoted or indirectly quoted someone who said :

>My Java program is started by using somebody's shell script. Inside his script:
>
>java -classpath his_lib/'*' Main

you could write a dummy java program that execs your real program.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Students who hire or con others to do their homework are as foolish 
as couch potatoes who hire others to go to the gym for them. 

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#20828

On 12/30/2012 10:53 AM, Roedy Green wrote:
> On Fri, 28 Dec 2012 09:07:39 -0800 (PST), zyng <xsli2@yahoo.com>
> wrote, quoted or indirectly quoted someone who said :
>> My Java program is started by using somebody's shell script. Inside his script:
>>
>> java -classpath his_lib/'*' Main
>
> you could write a dummy java program that execs your real program.

OP could do that.

But if is not an option to change the shell script, then it does
not help.

If it is an option to change the shell script, then the dummy
program is not needed.

Arne

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#20825

On Friday, December 28, 2012 12:07:39 PM UTC-5, zyng wrote:
> Hi: My Java program is started by using somebody's shell script. Inside his script: java -classpath his_lib/'*' Main However, I also wish to set Java's classpath for my code to work and I am not allowed to change his script.(He: actually is a company. My program is running inside this company's main frame). So when JVM starts, the true classpath is my_lib/'*';his_lib/'*'. Is that possible to do? Thank you.

At the risk of stating the obvious, perhaps set the %CLASSPATH% environment variable (or its Unix equivalent) prior to invoking your colleague's script.

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#20826

On 12/30/2012 2:50 PM, John L. wrote:
> On Friday, December 28, 2012 12:07:39 PM UTC-5, zyng wrote:
>> Hi: My Java program is started by using somebody's shell script.
>>Inside his script: java -classpath his_lib/'*' Main However, I also wish
>>to set Java's classpath for my code to work and I am not allowed to
>>change his script.(He: actually is a company. My program is running
>>inside this company's main frame). So when JVM starts, the true
>>classpath is my_lib/'*';his_lib/'*'. Is that possible to do? Thank you.
>
> At the risk of stating the obvious, perhaps set the %CLASSPATH%
> environment variable (or its Unix equivalent) prior to invoking your
> colleague's script.

The -cp argument override CLASSPATH env - it does not supplement it.

Arne

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#20829

On Sun, 30 Dec 2012 11:50:48 -0800, John L. wrote:

> On Friday, December 28, 2012 12:07:39 PM UTC-5, zyng wrote:
>> Hi: My Java program is started by using somebody's shell script. Inside
>> his script: java -classpath his_lib/'*' Main However, I also wish to
>> set Java's classpath for my code to work and I am not allowed to change
>> his script.(He: actually is a company. My program is running inside
>> this company's main frame). So when JVM starts, the true classpath is
>> my_lib/'*';his_lib/'*'. Is that possible to do? Thank you.
> 
> At the risk of stating the obvious, perhaps set the %CLASSPATH%
> environment variable (or its Unix equivalent) prior to invoking your
> colleague's script.

At the brisk of stating another obvious point, whats wrong with this 
summary of the situation?
 
1) the owner of the computer wants your program to be run on it.
2) an existing script must be changed for your program to run
3) the computer's sysadmins won't let anybody else change scripts
   on production systems. (a fairly common situation).

However this leaves the obvious outstanding question: why won't the 
sysadmins, i.e. 'the company', make the changes needed for your program 
to run?


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#20830

On 12/30/2012 3:49 PM, Martin Gregorie wrote:
> On Sun, 30 Dec 2012 11:50:48 -0800, John L. wrote:
>
>> On Friday, December 28, 2012 12:07:39 PM UTC-5, zyng wrote:
>>> Hi: My Java program is started by using somebody's shell script. Inside
>>> his script: java -classpath his_lib/'*' Main However, I also wish to
>>> set Java's classpath for my code to work and I am not allowed to change
>>> his script.(He: actually is a company. My program is running inside
>>> this company's main frame). So when JVM starts, the true classpath is
>>> my_lib/'*';his_lib/'*'. Is that possible to do? Thank you.
>>
>> At the risk of stating the obvious, perhaps set the %CLASSPATH%
>> environment variable (or its Unix equivalent) prior to invoking your
>> colleague's script.
>
> At the brisk of stating another obvious point, whats wrong with this
> summary of the situation?
>
> 1) the owner of the computer wants your program to be run on it.
> 2) an existing script must be changed for your program to run
> 3) the computer's sysadmins won't let anybody else change scripts
>     on production systems. (a fairly common situation).
>
> However this leaves the obvious outstanding question: why won't the
> sysadmins, i.e. 'the company', make the changes needed for your program
> to run?

Do you read Dilbert?

:-)

Arne

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#20831

On Sun, 30 Dec 2012 16:10:23 -0500, Arne Vajhøj wrote:

> On 12/30/2012 3:49 PM, Martin Gregorie wrote:
>> On Sun, 30 Dec 2012 11:50:48 -0800, John L. wrote:
>>
>>> On Friday, December 28, 2012 12:07:39 PM UTC-5, zyng wrote:
>>>> Hi: My Java program is started by using somebody's shell script.
>>>> Inside his script: java -classpath his_lib/'*' Main However, I also
>>>> wish to set Java's classpath for my code to work and I am not allowed
>>>> to change his script.(He: actually is a company. My program is
>>>> running inside this company's main frame). So when JVM starts, the
>>>> true classpath is my_lib/'*';his_lib/'*'. Is that possible to do?
>>>> Thank you.
>>>
>>> At the risk of stating the obvious, perhaps set the %CLASSPATH%
>>> environment variable (or its Unix equivalent) prior to invoking your
>>> colleague's script.
>>
>> At the brisk of stating another obvious point, whats wrong with this
>> summary of the situation?
>>
>> 1) the owner of the computer wants your program to be run on it.
>> 2) an existing script must be changed for your program to run 3) the
>> computer's sysadmins won't let anybody else change scripts
>>     on production systems. (a fairly common situation).
>>
>> However this leaves the obvious outstanding question: why won't the
>> sysadmins, i.e. 'the company', make the changes needed for your program
>> to run?
> 
> Do you read Dilbert?
> 
> :-)
>

Not usually, though I know the strip - of course. BOFH is more my style.
 
However, I am genuinely puzzled why nobody seems to be authorized to make 
what seems to be a simple change. For all I know the problem *is* a PHB. 
There are far too many of them around thanks to the Peter Principle and 
MBA schools.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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