question Re: Execute a java program from nifi with parameters in Support Questions

Execute a java program from nifi with parameters

adib_elaraki — Tue, 16 May 2017 20:55:47 GMT

Hi everyone,

i want to take some terms from a cassandra database, and then send them as a parameter to java program which will output some data that i will need to save in a cassandra database.

Is this possible with nifi, if yes, which processors to use? specially for the execution of the java program, since i've seen that processors for cassandra already exists.

Thanks!

Re: Execute a java program from nifi with parameters

Wynner — Wed, 17 May 2017 02:28:39 GMT

@amine adi

You can use the ExecuteStreamCommand processor to run the java program and it uses the expression language, so you will be able to pass attributes as parameters to the command line.

Re: Execute a java program from nifi with parameters

adib_elaraki — Wed, 17 May 2017 02:56:50 GMT

Can you please give me an example?

Re: Execute a java program from nifi with parameters

Wynner — Sun, 18 Aug 2019 10:09:47 GMT

@amine adi

Here is an example of java program being passed the name of the flow file as a parameter on the command line:

Re: Execute a java program from nifi with parameters

adib_elaraki — Wed, 17 May 2017 03:53:55 GMT

thanks a lot! just one more question, how to get the output from the java program in nifi?

Re: Execute a java program from nifi with parameters

Wynner — Wed, 17 May 2017 04:08:20 GMT

@amine adi

NiFi does that automatically.

The processor executes an external command on the contents of a flow file, and creates a new flow file with the results of the command.

Re: Execute a java program from nifi with parameters

Akshaytsy — Mon, 18 Apr 2022 15:55:38 GMT

What is that jar file about. Is it an application or Single file app.