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From: Arun C Murthy <acm@hortonworks.com>
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Subject: Re: Hadoop-2 generics compilation error
Date: Fri, 29 Jun 2012 11:01:54 -0700
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HDFS-3113 is committed? Or, are you running with the patch yourself?

It's still PA and I see Daryn reviewing it yet...

Arun

On Jun 28, 2012, at 10:27 PM, lars hofhansl wrote:

> Since HDFS-3113 was integrated into Hadoop-2 I get the compilation =
errors of the following type:
>=20
> [ERROR] =
/home/lars/dev/hadoop-2/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/ja=
va/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
>=20
>=20
> Indeed at line 407 I see:
>=20
>         boolean hasData =3D params.get(DataParam.NAME, =
DataParam.class);
>=20
>=20
> When I change that to
>         Boolean hasData =3D params.get(DataParam.NAME, =
DataParam.class);
>=20
>=20
> instead (along with long to Long, short to Short, etc, later in that =
file), everything compiles fine.
>=20
> $ javac -version
> javac 1.6.0_24
>=20
>=20
> $ 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)
>=20
> 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=20
> compiled with OpenJDK?
> I'm happy to create a jira and (trivial) patch.
>=20
>=20
> Thanks.
>=20
> -- Lars
>=20

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/


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