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https://issues.apache.org/jira/browse/SPARK-21255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143426#comment-16143426
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Apache Spark commented on SPARK-21255:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/19066
> 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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