Not working. An exception happens when exec:java maven phase is running

[alonsoir]

Hi @klevis , when i try to run with mvn clean install exec:java, this exception happens:

[WARNING]
java.lang.reflect.InvocationTargetException
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:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:297)
at java.lang.Thread.run (Thread.java:748)
Caused by: java.lang.NoSuchFieldException: theCaseInsensitiveEnvironment
at java.lang.Class.getDeclaredField (Class.java:2070)
at ramo.klevis.Run.setHadoopHomeEnvironmentVariable (Run.java:37)
at ramo.klevis.Run.main (Run.java:17)
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:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:297)
at java.lang.Thread.run (Thread.java:748)

I am running osx 10.13.5
booksRecommenderWithAutocomplete aironman$ java -version
java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)
MacBook-Pro-Retina-de-Alonso:booksRecommenderWithAutocomplete aironman$ mvn -version
Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T20:33:14+02:00)
Maven home: /usr/local/Cellar/maven/3.5.4/libexec
Java version: 1.8.0_172, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk1.8.0_172.jdk/Contents/Home/jre
Default locale: es_ES, platform encoding: UTF-8
OS name: "mac os x", version: "10.13.5", arch: "x86_64", family: "mac"

[klevis]

Hi @alonsoir
Hope I am not too late since I was on vacation.

Application was develop and tested only on windows and I see that you have run it on Mac. Unfortunately I have only windows so is very little I can do to help. Anyway from the exception I see that the problem is with setHadoopHomeEnvironmentVariable() which is setting the HADOOP path variable so HADOOP native is found when application is run. In order to fix you can try:

1. Try to comment the line setHadoopHomeEnvironmentVariable(); at Run class. Less possible it will work... without HADOOP(2) but you never know :).
2. Install HADOOP on Mac(executable from command line) so application will be able to find it and comment also the line setHadoopHomeEnvironmentVariable(); since is working only for windows.
   Inside repository you will find winutils-master which contains HADOOP for windows- the one the setHadoopHomeEnvironmentVariable is try to temporary register as public variable.

Of course there may be other solutions so please feel free to send a pull request in case you found it.

Cheers, Klevis

[suyashcjoshi]

I ran into the same problem and commenting out the line to set environment variable for hadoop seem to have worked. May I know why is this program using Hadoop, what's the dependency upon Hadoop?

[klevis]

@SuyashJoshi Application uses Spark which requires Hadoop. If application works fine when Hadoop is not installed(which was not the case for me) please feel free to remove the dependency and PR the change.