My project depends on Netty Epoll transport. Here is dependency:
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-transport-native-epoll</artifactId>
<version>${netty.version}</version>
<classifier>${epoll.os}</classifier>
</dependency>
The auto-generated module name for this dependency is:
netty.transport.native.epoll
And as the native
keyword is reserved in Java 9 I can't add this module as a dependency to my project:
module core {
requires netty.transport.native.epoll;
}
Due to:
module not found: netty.transport.<error>
Additionally the jar tool --describe-module
reports the following:
Unable to derive module descriptor for: netty-transport-native-epoll-4.1.17.Final-SNAPSHOT-linux-x86_64.jar netty.transport.native.epoll: Invalid module name: 'native' is not a Java identifier
Are there any workarounds? (except "release correct netty artifact", of course).
EDIT:
As the quick fix for maintainers - you can add next line to build:
<manifestEntries>
<Automatic-Module-Name>netty.transport.epoll</Automatic-Module-Name>
</manifestEntries>
The solution to this seems to be:-
OR
module-info.java
to their JAR. (this could result in a slow bottom-up migration)Since the module declaration defined in the specs as:
A module declaration introduces a module name that can be used in other module declarations to express relationships between modules. A module name consists of one or more Java identifiers (§3.8) separated by "." tokens.
Intersetingly the declarations suggests -
In some cases, the Internet domain name may not be a valid package name. Here are some suggested conventions for dealing with these situations:
If the domain name contains a hyphen, or any other special character not allowed in an identifier (§3.8), convert it into an underscore.
If any of the resulting package name components are keywords (§3.9), append an underscore to them.
If any of the resulting package name components start with a digit, or any other character that is not allowed as an initial character of an identifier, have an underscore prefixed to the component.
But keep in mind as you do so that Underscore is a keyword in Java9
int _; // is would throw an error on javac based out of JDK9
int _native; // works fine