[jira] [Updated] (SPARK-21255) NPE when creating encoder for enum

["Mike (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike updated SPARK-21255:
-------------------------
    Description: 
When you try to create an encoder for Enum type (or bean with enum property) via Encoders.bean(...), it fails with NullPointerException at TypeToken:495.
I did a little research and it turns out, that in JavaTypeInference:126 following code 

{code:java}
val beanInfo = Introspector.getBeanInfo(typeToken.getRawType)
val properties = beanInfo.getPropertyDescriptors.filterNot(_.getName == "class")
val fields = properties.map { property =>
          val returnType = typeToken.method(property.getReadMethod).getReturnType
          val (dataType, nullable) = inferDataType(returnType)
          new StructField(property.getName, dataType, nullable)
        }
(new StructType(fields), true)
{code}

filters out properties named "class", because we wouldn't want to serialize that. But enum types have another property of type Class named "declaringClass", which we are trying to inspect recursively. Eventually we try to inspect ClassLoader class, which has property "defaultAssertionStatus" with no read method, which leads to NPE at TypeToken:495.

I think adding property name "declaringClass" to filtering will resolve this.

  was:
When you try to create an encoder for Enum type (or bean with enum property) via Encoders.bean(...), it fails with NullPointerException at TypeToken:495.
I did a little research and it turns out, that in JavaTypeInference:126 following code 

{code:scala}
val beanInfo = Introspector.getBeanInfo(typeToken.getRawType)
val properties = beanInfo.getPropertyDescriptors.filterNot(_.getName == "class")
val fields = properties.map { property =>
          val returnType = typeToken.method(property.getReadMethod).getReturnType
          val (dataType, nullable) = inferDataType(returnType)
          new StructField(property.getName, dataType, nullable)
        }
(new StructType(fields), true)
{code}

filters out properties named "class", because we wouldn't want to serialize that. But enum types have another property of type Class named "declaringClass", which we are trying to inspect recursively. Eventually we try to inspect ClassLoader class, which has property "defaultAssertionStatus" with no read method, which leads to NPE at TypeToken:495.

I think adding property name "declaringClass" to filtering will resolve this.


> NPE when creating encoder for enum
> ----------------------------------
>
>                 Key: SPARK-21255
>                 URL: https://issues.apache.org/jira/browse/SPARK-21255
>             Project: Spark
>          Issue Type: Bug
>          Components: Java API
>    Affects Versions: 2.1.0
>         Environment: org.apache.spark:spark-core_2.10:2.1.0
> org.apache.spark:spark-sql_2.10:2.1.0
>            Reporter: Mike
>
> When you try to create an encoder for Enum type (or bean with enum property) via Encoders.bean(...), it fails with NullPointerException at TypeToken:495.
> I did a little research and it turns out, that in JavaTypeInference:126 following code 
> {code:java}
> val beanInfo = Introspector.getBeanInfo(typeToken.getRawType)
> val properties = beanInfo.getPropertyDescriptors.filterNot(_.getName == "class")
> val fields = properties.map { property =>
>           val returnType = typeToken.method(property.getReadMethod).getReturnType
>           val (dataType, nullable) = inferDataType(returnType)
>           new StructField(property.getName, dataType, nullable)
>         }
> (new StructType(fields), true)
> {code}
> filters out properties named "class", because we wouldn't want to serialize that. But enum types have another property of type Class named "declaringClass", which we are trying to inspect recursively. Eventually we try to inspect ClassLoader class, which has property "defaultAssertionStatus" with no read method, which leads to NPE at TypeToken:495.
> I think adding property name "declaringClass" to filtering will resolve this.



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