a java classpath question

[zyng]

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.

 

[Arne Vajhøj]

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

 

[zyng]

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.

 

[zyng]

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

 

[Arne Vajhøj]

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

 

[Arne Vajhøj]

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

 

[Lew]

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

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

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/ ...

 

[Roedy Green]

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]

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.

 

[John L.]

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% environmentvariable (or its Unix equivalent) prior to invoking your colleague's script.

 

[Arne Vajhøj]

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

 

[Arne Vajhøj]

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

 

[Arne Vajhøj]

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