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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5070) Unable to use Scala's BeanProperty with classes
Date Wed, 15 Feb 2017 10:08:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867581#comment-15867581
] 

ASF GitHub Bot commented on FLINK-5070:
---------------------------------------

GitHub user twalthr opened a pull request:

    https://github.com/apache/flink/pull/3318

    [FLINK-5070] [types] Unable to use Scala's BeanProperty with classes

    This PR fixes issues with `@BeanProperty` annotation. The problem is that `var` generates
Scala-style getters/setters and the annotation generates Java-style getters/setters. Right
now Flink only supports one style in a POJO. I don't know why we have this restriction. I
removed them.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/twalthr/flink FLINK-5070

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/3318.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 #3318
    
----
commit 552e708a713df6ed9fe65f508771e56b0dbcd50b
Author: twalthr <twalthr@apache.org>
Date:   2017-02-15T10:05:38Z

    [FLINK-5070] [types] Unable to use Scala's BeanProperty with classes

----


> Unable to use Scala's BeanProperty with classes
> -----------------------------------------------
>
>                 Key: FLINK-5070
>                 URL: https://issues.apache.org/jira/browse/FLINK-5070
>             Project: Flink
>          Issue Type: Bug
>          Components: Core, Scala API, Type Serialization System
>    Affects Versions: 1.1.3
>            Reporter: Jakub Nowacki
>            Assignee: Timo Walther
>
> When using Scala class with with property (both var and val) annotated as BeanProperty,
throws an exception {{java.lang.IllegalStateException: Detected more than one getter}}.
> The simple code which follows throws that exception:
> {code:java}
> class SomeClass(@BeanProperty var prop: Int)
> object SampleBeanProperty {
>     def main(args: Array[String]): Unit = {
>         val env = StreamExecutionEnvironment.createLocalEnvironment()
>         // Create a DataSet from a list of elements
>         env.fromElements(1,2)
>             .map(new SomeClass(_))
>             .print
>         env.execute()
>     }
> }
> {code}
> Full exception:
> {code}
> Exception in thread "main" java.lang.IllegalStateException: Detected more than one setter
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.isValidPojoField(TypeExtractor.java:1646)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.analyzePojo(TypeExtractor.java:1692)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1580)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.privateGetForClass(TypeExtractor.java:1479)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:737)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:543)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:497)
> 	at org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:493)
> 	at SampleBeanProperty$.main(SampleBeanProperty.scala:18)
> 	at SampleBeanProperty.main(SampleBeanProperty.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:498)
> 	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
> {code}
> If the class is changed into case class, code with BeanProperty works fine.



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