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From Eli Collins <...@cloudera.com>
Subject Re: Hadoop-2 generics compilation error
Date Fri, 29 Jun 2012 16:27:33 GMT
Sounds reasonable, file a jira/patch?

On Thursday, June 28, 2012, lars hofhansl wrote:

> Since HDFS-3113 was integrated into Hadoop-2 I get the compilation errors
> of the following type:
>
> [ERROR]
> /home/lars/dev/hadoop-2/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java:[407,36]
> incompatible types; no instance(s) of type variable(s) V exist so that V
> conforms to boolean
>
>
> Indeed at line 407 I see:
>
>         boolean hasData = params.get(DataParam.NAME, DataParam.class);
>
>
> When I change that to
>         Boolean hasData = params.get(DataParam.NAME, DataParam.class);
>
>
> instead (along with long to Long, short to Short, etc, later in that
> file), everything compiles fine.
>
> $ javac -version
> javac 1.6.0_24
>
>
> $ java -version
> java version "1.6.0_24"
> OpenJDK Runtime Environment (IcedTea6 1.11.3)
> (fedora-67.1.11.3.fc16-x86_64)
> OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
>
> Apparently OpenJDK gets mixed up on the type inference here. Can we change
> this in the way I suggest so that Hadoop-2 (and presumably trunk) can be
> compiled with OpenJDK?
> I'm happy to create a jira and (trivial) patch.
>
>
> Thanks.
>
> -- Lars
>
>

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