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https://issues.apache.org/jira/browse/FLINK-6909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101729#comment-16101729
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Md Kamaruzzaman commented on FLINK-6909:
----------------------------------------
I have a simple ETL process which read CSV file and write it to a file as JSON.
Here is the Pojo which maps the CSV file:
@Getter
@Setter
@NoArgsConstructor
public class ImdbRating{
.
.
}
Here @Getter, @Setter, @NoArgsConstructor are annotations from lombok which
will generate getter, setter and default constructor in the bytecode.
Here is the code snippet to load csv data:
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
env.registerType(ImdbRating.class);
DataSource<ImdbRating> dataSource =
env.readCsvFile(sourceFile.getPath()).ignoreFirstLine()
.ignoreInvalidLines().pojoType(ImdbRating.class, "position",
"imdbId", "created", "modified", "description", "title", "titleType",
"directors",
"rating", "imdbRating", "runtime", "year", "genres",
"numberOfVotes", "releaseDate", "url");
Running this gives the following exceptions:
java.lang.ClassCastException:
org.apache.flink.api.java.typeutils.GenericTypeInfo cannot be cast to
org.apache.flink.api.java.typeutils.PojoTypeInfo
at org.apache.flink.api.java.io.CsvReader.pojoType(CsvReader.java:318)
If I remove the lombok annotations and write getter in the class, then it works
fine.
I have debugged a bit and it looks like the class 'TypeExtractor' fails to
recognize ImdbLoader as a valid Java POJO when lombok annotations are used.
> Flink should support Lombok POJO
> --------------------------------
>
> Key: FLINK-6909
> URL: https://issues.apache.org/jira/browse/FLINK-6909
> Project: Flink
> Issue Type: Wish
> Components: Type Serialization System
> Reporter: Md Kamaruzzaman
> Priority: Minor
> Fix For: 1.2.1
>
>
> Project lombok helps greatly to reduce boilerplate Java Code.
> It seems that Flink does not accept a lombok POJO as a valid pojo.
> e.g. Here is a POJO defined with lombok:
> @Getter
> @Setter
> @NoArgsConstructor
> public class SimplePojo
> Using this Pojo class to read from CSV file throws this exception:
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.flink.api.java.typeutils.GenericTypeInfo cannot be cast to
> org.apache.flink.api.java.typeutils.PojoTypeInfo
> It would be great if flink supports lombok POJO.
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