My local build using rc-4 and java 7 does actually also produce different binaries (for one file only) than the 1.4.0 releqse artifact available on Central. These binaries also decompile to identical instructions, but this may be due to different versions of javac (within the 7 family) producing different output, rather than a major-version difference between build environments. On Aug 25, 2015 11:10 PM, "Sean Owen" <so...@cloudera.com> wrote:
> Hm... off the cuff I wonder if this is because somehow the build > process ran Maven with Java 6 but forked the Java/Scala compilers and > those used JDK 7. Or some later repackaging process ran on the > artifacts and used Java 6. I do see "Build-Jdk: 1.6.0_45" in the > manifest, but I don't think 1.4.x can compile with Java 6. > > On Tue, Aug 25, 2015 at 9:59 PM, Rick Moritz <rah...@gmail.com> wrote: > > A quick question regarding this: how come the artifacts (spark-core in > > particular) on Maven Central are built with JDK 1.6 (according to the > > manifest), if Java 7 is required? > > > > On Aug 21, 2015 5:32 PM, "Sean Owen" <so...@cloudera.com> wrote: > >> > >> Spark 1.4 requires Java 7. > >> > >> > >> On Fri, Aug 21, 2015, 3:12 PM Chen Song <chen.song...@gmail.com> wrote: > >>> > >>> I tried to build Spark 1.4.1 on cdh 5.4.0. Because we need to support > >>> PySpark, I used JDK 1.6. > >>> > >>> I got the following error, > >>> > >>> [INFO] --- scala-maven-plugin:3.2.0:testCompile > >>> (scala-test-compile-first) @ spark-streaming_2.10 --- > >>> > >>> java.lang.UnsupportedClassVersionError: > org/apache/hadoop/io/LongWritable > >>> : Unsupported major.minor version 51.0 > >>> at java.lang.ClassLoader.defineClass1(Native Method) > >>> at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) > >>> at java.lang.ClassLoader.defineClass(ClassLoader.java:621) > >>> at > >>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) > >>> > >>> I know that is due to the hadoop jar for cdh5.4.0 is built with JDK 7. > >>> Anyone has done this before? > >>> > >>> Thanks, > >>> > >>> -- > >>> Chen Song > >>> > > >
