ArrayIndexOutOfBoundsException

[satybald]

When I try to run FTP Client, I get ArrayIndexOutOfBoundsException.

com.intellij.rt.execution.application.AppMain org.learningconcurrency.ch9.FTPClient
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at org.learningconcurrency.ch9.FTPClient$.main(FTPClient.scala:305)
at org.learningconcurrency.ch9.FTPClient.main(FTPClient.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Process finished with exit code 1

[axel22]

This is because you have to set the argument of the FTPServer (which you need to run before your run the client):

https://github.com/axel22/learning-scala-concurrency/blob/master/src/main/scala/org/learningconcurrency/ch9/FTPClient.scala#L305

This will be explained in detail in the book, but I will add some error handling to produce a reasonable error message if you don't specify the server address.

[axel22]

More precisely, you should run the server first:

> run 12345

and select the FTPServer program from the list.
Then, you should run the client:

> run 127.0.0.1:12345

and select the FTPClient program from the list.

[satybald]

Got it! Thank you @axel22 for explanation.

[axel22]

Maybe input arguments should be treated with better error messages. I'll fix this in the coming days.