Re: Java 8 and type erasure

Posted by Aljoscha Krettek on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Java-8-and-type-erasure-tp2411p2414.html

Hi Kristoffer,

I'm afraid not, but maybe Timo has some further information. In this extended example we can see the problem: https://gist.github.com/aljoscha/84cc363d13cf1dfe9364. The output is:

Type is: class org.apache.flink.examples.java8.wordcount.TypeTest$Thing

class org.apache.flink.examples.java8.wordcount.TypeTest$Thing

Type is: class org.apache.flink.examples.java8.wordcount.TypeTest$Thing

class org.apache.flink.examples.java8.wordcount.TypeTest$Thing

Type is : org.apache.flink.examples.java8.wordcount.TypeTest.org.apache.flink.examples.java8.wordcount.TypeTest$Thing<java.lang.String>

class org.apache.flink.examples.java8.wordcount.TypeTest$Thing

So with the two lambda calls it does not correctly determine the generic parameter of Thing while it works with the anonymous class.

I was exited when I saw the example because we've been trying for so long to get this to work. Maybe we have to wait for java 19 to get this to work. ;-)

Thanks a lot for helping, though. :D

Aljoscha

On Tue, 18 Aug 2015 at 11:01 Kristoffer Sjögren <[hidden email]> wrote:

Hi

Potential fix for writing flink jobs using lamdas without Eclipse JDT?

https://gist.github.com/aslakhellesoy/3678beba60c109eacbe5

Cheers,
-Kristoffer