Http connection in JavaTextFileSource inside an exception

[zkaoudi]

Currently, the code for reading files remotely through an Http call in the JavaTextFileSource is inside a catch (Exception e):

incubator-wayang/wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/operators/JavaTextFileSource.java

Line 98 in 31b5a29

catch (Exception e) {

This is problematic because, if a user just passes the wrong path to a local file, the exception message they get a Java class cast error instead of a file-does-not-exist error.