Thanks. Sounds weird I imagine the Flink team have a road-map to migrate to Java 1.8
On "Build From source <https://ci.apache.org/projects/flink/flink-docs-release-1.2/setup/building.html>": "Flink requires *at least Java 7* to build. We recommend using Java 8." 2016-11-13 17:48 GMT+01:00 Andrey Melentyev <andrey.melent...@gmail.com>: > Hi Alberto, > > it seems that this class is not compatible with Java 8 new type inference > rules, more specifically the 1.8 compiler picks a different overloaded > method than 1.7. > > In TupleSerializer.java:112 the call to TypeSerializer.copy method in Java > 7 resolves to > > public abstract T copy(T from, T reuse); > > while with Java 8 following the new inference rules (which basically > selects the most specific matching method) the compiler prefers > > public abstract void copy(DataInputView source, DataOutputView target) throws > IOException; > > and the compilation fails. It's the only place in the production code > where this change in the compilation logic seems to cause compile-time > errors. There are a few unit tests that fail to pick the correct overloaded > method alternative as well. > > Since Java 7 is end of life, I think it makes sense to be able to build > Flink with Java 8 source/target. If you create a Jira for the compilation > issue, I can suggest a PR fixing the compile-time errors and the tests. > > Note that you can still use JDK8 to compile Flink without changing the > java.version in pom.xml, in this scenario the compiler will not try to use > 1.8 language features and the compilation will succeed. You can also run > your Flink cluster using the Java 8 runtime. > > Andrey > > On Sun, Nov 13, 2016 at 12:29 AM, Alberto Ramón <a.ramonporto...@gmail.com > > wrote: > >> bash> git Clone >> POM> <java.version>1.8</java.version> >> bash> java -version ==> java version "1.8.0_111" >> >> >> *Failed to execute goal >> org.apache.maven.plugins:maven-compiler-plugin:3.1:compile >> (default-compile) on project flink-core: Compilation failure[ERROR] . . . >> /flink1.2 >> _10_Nov/flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/TupleSerializer.java:[112,63] >> incompatible types: void cannot be converted to java.lang.Object* >> >> is this Normal ? >> (If I put 1.7, there isn't any problem) >> > >
