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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-21255) NPE when creating encoder for enum
Date Fri, 25 Aug 2017 06:26:00 GMT

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

Sean Owen reassigned SPARK-21255:
---------------------------------

    Assignee: Mike

> 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
>            Assignee: Mike
>             Fix For: 2.3.0
>
>
> 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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