Execute a java program from nifi with parameters

[#1]

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!

[#2 · Accepted solution]

@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.

[#3]

Can you please give me an example?

[#4]

@amine adi

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

[#5]

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

[#6]

@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.

[#7]

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