CODEWITHSUNDEEP
javacard
10101010
10101010

Reputation: 131

what is necessary to build cap file uses proprietary package except *.exp file?

i have java card which supports some proprietary classes, say "ClassFoo" in package "packagename.foo". I have documentation for these classes and "foo.exp" file. But as i undestand it is neccessary something else to build cap file because without it compiler finds errors like uknown import package and unknown class. Right? What is it?

Upvotes: 3

Views: 564

Answers (1)

Maarten Bodewes
Maarten Bodewes

Reputation: 94038

The .exp file is used by the offcard Java Card converter. The converter converts standard Java classes to the .cap files which can be uploaded to the Java Card implementation (usually through Global Platform).

To generate these class files you first need to compile the classes. For this the usual Java linker needs to link against the interface of the external classes. So vlp is correct that you need .class files to compile against. Usually those classes are packaged into a .jar file.

Now the actual implementation of these classes usually only runs on a Java Card runtime. The linking is performed using the .exp file. So the contents of the actual classes is not important during linking, and they are not used during execution either (unless you are running on jCardSim of course).

So it's quite often that you get a .jar that contains all the public interfaces, classes and methods but doesn't contain any implementation (other than return null or return 0 where required).

It may even be possible to generate your own stub and link against that if you know the full interface (from the Java Doc).

Upvotes: 5

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