JESS: Problem on handling the function 'batch'

[francisco santiago]

Hello. This is my first time using Jess. I have a full project in which I'm making some changes. This project works via ANT (build.xml file fully functional).

The project is working at 100%, but we want to run it without ANT. ANT manages the classpath to add some paths to critical locations into the app.

I'm having a problem when invoking the function 'batch' in Jess when I give it an argument like 'fileName.clp'.

Jess reports an error saying it cannot open the file. The file is under a subdirectory into the app base directory. If I put the file into this root directory, all works well.

But it's necessary to have those clp's placed in a subfolder.

I've tried using System.getProperties().setProperty("java.class.path",'clp's-directory-path'), but only Java code find it useful by using Class.getResourceAsStream() to get acces to the resources (as 'fileName.clp' is). But Jess still gives the same error, like it doesn't see the changes done to the classpath via Java code in execution time.

'java.class.path' property contains paths to the ./ and ./build locations initially. I've noted that placing directly the clp's into those places makes Jess find them. Any other location doesn't work. Appending to that classpath variable the path to my dir of clp's is the solution I've tried, as explained in the paragraph above.

Thank you so much for yout attention and sorry for the length of the e-mail. I think that details were necesary.

[David Coyle-3]

Francisco:

Instead of using batch(), you can use eval() with the contents of a
file as a String.

I have found that by loading the file myself using resource loading
mechanisms that are native to my app server environment, and caching
it in the application, then providing a String to eval() sped up
performance by about an order of magnitude over a batch() with the
same content.

Of course, your mileage may vary.

-d-

On Mar 30, 2008, at 2:53 PM, francisco santiago wrote:

> Hello. This is my first time using Jess. I have a full project in
> which I'm making some changes. This project works via ANT
> (build.xml file fully functional).
>
> The project is working at 100%, but we want to run it without ANT.
> ANT manages the classpath to add some paths to critical locations
> into the app.
>
> I'm having a problem when invoking the function 'batch' in Jess
> when I give it an argument like 'fileName.clp'.
>
> Jess reports an error saying it cannot open the file. The file is
> under a subdirectory into the app base directory. If I put the file
> into this root directory, all works well.
>
> But it's necessary to have those clp's placed in a subfolder.
>
> I've tried using System.getProperties().setProperty
> ("java.class.path",'clp's-directory-path'), but only Java code find
> it useful by using Class.getResourceAsStream() to get acces to the
> resources (as 'fileName.clp' is). But Jess still gives the same
> error, like it doesn't see the changes done to the classpath via
> Java code in execution time.
>
> 'java.class.path' property contains paths to the ./ and ./build
> locations initially. I've noted that placing directly the clp's
> into those places makes Jess find them. Any other location doesn't
> work. Appending to that classpath variable the path to my dir of
> clp's is the solution I've tried, as explained in the paragraph above.
>
> Thank you so much for yout attention and sorry for the length of
> the e-mail. I think that details were necesary.

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[Ernest Friedman-Hill]

You're mistaken that setting the property java.class.path changes the  
path that the application classloader will use to load classes; that  
property is basically read-only, and represents the classpath at JVM  
launch.

Anyway, "batch" will indeed find files along the classpath. If your  
application's "root directory" is on the classpath, and the CLP file  
is in a subdirectory "foo" below that root directory, then either  
'batch("/foo/filename.clp")' or 'batch("foo/filename.clp")' would  
find it just fine.


On Mar 30, 2008, at 5:53 PM, francisco santiago wrote:

> Hello. This is my first time using Jess. I have a full project in  
> which I'm making some changes. This project works via ANT  
> (build.xml file fully functional).
>
> The project is working at 100%, but we want to run it without ANT.  
> ANT manages the classpath to add some paths to critical locations  
> into the app.
>
> I'm having a problem when invoking the function 'batch' in Jess  
> when I give it an argument like 'fileName.clp'.
>
> Jess reports an error saying it cannot open the file. The file is  
> under a subdirectory into the app base directory. If I put the file  
> into this root directory, all works well.
>
> But it's necessary to have those clp's placed in a subfolder.
>
> I've tried using System.getProperties().setProperty
> ("java.class.path",'clp's-directory-path'), but only Java code find  
> it useful by using Class.getResourceAsStream() to get acces to the  
> resources (as 'fileName.clp' is). But Jess still gives the same  
> error, like it doesn't see the changes done to the classpath via  
> Java code in execution time.
>
> 'java.class.path' property contains paths to the ./ and ./build  
> locations initially. I've noted that placing directly the clp's  
> into those places makes Jess find them. Any other location doesn't  
> work. Appending to that classpath variable the path to my dir of  
> clp's is the solution I've tried, as explained in the paragraph above.
>
> Thank you so much for yout attention and sorry for the length of  
> the e-mail. I think that details were necesary.

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences          Phone: [phone]
Sandia National Labs                FAX:   [phone]
PO Box 969, MS 9012                 ejfried@...
Livermore, CA 94550                 http://www.jessrules.com




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