GitHub user chermenin opened a pull request:
https://github.com/apache/flink/pull/2328
[hotfix] Fix TypeExtractor.
When function is a method reference to an instance method of an arbitrary
object of a particular type it hasn't any parameters and getting of input type
throws exception.
For example this code
```
environment.fromElements(1, 2, 3, 4, 5).map(Object::toString).print();
```
throws exception:
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at
org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:350)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:304)
at
org.apache.flink.api.java.typeutils.TypeExtractor.getMapReturnTypes(TypeExtractor.java:119)
at org.apache.flink.api.java.DataSet.map(DataSet.java:215)
at ru.chermenin.flink.task.TestTask.main(TestTask.java:14)
```
but this is executed normally:
```
environment.fromElements(1, 2, 3, 4, 5).map(i -> i.toString()).print();
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/chermenin/flink master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2328.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2328
commit e5ca7a91e954043d8c217810b2004825ce68ee5e
Author: Alex Chermenin
Date: 2016-08-03T07:34:21Z
[hotfix] Fix TypeExtractor.
When function is a method reference to an instance method of an arbitrary
object of a particular type it hasn't any parameters and getting of input type
throws exception.
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