callj

[StuartB]

Can someone point me in the right direction. I'm attempting to get a uuid using the java util class. I've tried a few different permutations. Just keep getting system(0) = 6 "Cannot find object constructor".

p = null

CALLJ "java.util.UUID","$randomUUID",p SETTING ret

CRT "out: ":SYSTEM(0), ret

out: 6  32768

[Mvreply]

Stuart,

There is a comprehensive example here, including troubleshooting tips, in case you have not seen it:

 

https://docs.zumasys.com/jbase/jbc/callj/

 

Mike

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[Jim Idle]

A bit overkill to call Java for a UUID - but I suspect that you have not declared an explicit constructor for the class, which leaves the default one generated by the compiler, which is not very accessible - add an explicit constructor.

If on Linux, you can just use EXECUTE:

https://www.digitalocean.com/community/tutorials/workflow-command-line-basics-generating-uuids

Jim

[Stuart Boydell]

Thanks Jim, I just wanted to get a simple callj example working. I was looking at invoking a library for another application.

Apparently the return value needs to be a string so it won't work for the application. Cheers 

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[Jim Idle]

I see - yes, CALLJ was just meant to be a simple way to call simple methods, so it won't do anything too sophisticated. You can of course create a different class that calls the library and returns UUID as a string, but if you were just trying to get an example going, then the example page should do that for you :)

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