Pierre De Rop created FELIX-5967:
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Summary: DM does not support java9+
Key: FELIX-5967
URL: https://issues.apache.org/jira/browse/FELIX-5967
Project: Felix
Issue Type: Improvement
Affects Versions: org.apache.felix.dependencymanager-r8
Reporter: Pierre De Rop
Assignee: Pierre De Rop
Dependency Manager can't be built/used on java9+ (9,10,11), because of the
following issues:
1) for configuration types, when we parse interface "default methods", the way
we are parsing does not work in java 9+, and a patch must be applied.
See [1].
2) for dm-lambda, the way to parse the lambda parameter names for "fluent"
service properties (which requires the -parameters javac option) does not work
in java 9+.
For example, the following does not work
{code:java}
compnent(comp -> comp.impl(Foo.class).provides(FooService.class, property ->
"service property value"));{code}
So, the "property" lambda parameter name can't be parsed in Java9+. This is
likely because starting from java9, the -parameters option is not generating
anymore the metadata for the lambda parameter names (see [2]). For the moment,
the fluent service properties willl work only using java8, but not anymore on
java9+, and the most reasonable thing is to deprecate the usage of fluent
service properties, meaning that instead of:
{code:java}
compnent(comp -> comp.impl(Foo.class).provides(FooService.class, property ->
"service property value"));{code}
you then must replace by:
{code:java}
compnent(comp -> comp.impl(Foo.class).provides(FooService.class,
"property","service property value"));{code}
So, the fluent service properties must be commented as in restriction if java9+
is used. No need to bump the dm-lambda bundle version, becaue it still works
using java8.
3) the gradle version needs to be updated, and for java11 support, the
"--no-daemon" option must be used when building.
[1]
[https://dzone.com/articles/correct-reflective-access-to-interface-default-methods]
[2]https://bugs.openjdk.java.net/browse/JDK-8138729
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