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https://issues.apache.org/jira/browse/SPARK-21255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069754#comment-16069754
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Hyukjin Kwon edited comment on SPARK-21255 at 6/30/17 9:10 AM:
---------------------------------------------------------------
Thanks for cc'ing me. It looks this was introduced long time ago in the first
place.
I double checked {{declaringClass}} and
https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html and it works if
we filter out. It sounds good to me too.
The reproducer I used is as below:
{code}
public enum A {
B("www.google.com");
private String url;
private A(String url) {
this.url = url;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
return url;
}
}
@Test
public void testEnum() {
List<A> data = Arrays.asList(A.B);
spark.createDataFrame(data, A.class).show();
}
{code}
was (Author: hyukjin.kwon):
Thanks for cc'ing me. It looks this was introduced long time ago in the first
place.
I double checked {{declaringClass}}
andhttps://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html and it works
if we filter out. It sounds good to me too.
The reproducer I used is as below:
{code}
public enum A {
B("www.google.com");
private String url;
private A(String url) {
this.url = url;
}
public String getUrl() {
return url;
}
public String setUrl(String url) {
return url;
}
}
@Test
public void testEnum() {
List<A> data = Arrays.asList(A.B);
spark.createDataFrame(data, A.class).show();
}
{code}
> 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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