Jakub Nowacki created FLINK-5070:
------------------------------------
Summary: 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
Affects Versions: 1.1.3
Reporter: Jakub Nowacki
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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