importing a Java package for use in serverside JavaScript

[dvanhussel]

Hi,

I have written a simple base64Encode class in Java that I want to use in serverside-JavaScript.

We already have a .jar file with some custom functions. In the same .jar is also a package 'nl.haarlem.utils' with some, guess what... utility functions

I added the new function as a static method to a new Class, named Encoding.

Then I used this import:

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importPackage(nl.haarlem.utils);

This generates the error:

org.mozilla.javascript.EcmaError.ReferenceError: "nl" is not defined

When I add the same class to the 'com.ebasetech.ufs.customfunctions' package of our .jar, I can import the package with:

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importPackage(com.ebasetech.ufs.customfunctions);

Then the new function is available as expected.

Do I have to 'register' our package-name to be able to use it?

[Jon]

I think this is a problem with the way that Rhino (the Javascript implementation) works. It looks like it accesses java classes using a variable called 'Packages'. Prefixes 'com', 'org' and 'java' seem to have been defined for us (e.g. var com = Packages.com;). But you are trying to access a package called 'nl' which hasn't been defined.

So you should try:

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importPackage(Packages.nl.haarlem.utils);

or if this doesn't work, skip the import, and refer to the full class name e.g.

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var x = new Packages.nl.haarlem.utils.Encoding();

Or alternatively, use a package name that starts with 'com', 'org' or'java'.

[dvanhussel]

Hi Jon,

It was indeed fixed when I added 'Packages' to the package defenition:

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importPackage(Packages.nl.haarlem.utils); 

Thanks!