asfimport opened a new issue, #379:
URL: https://github.com/apache/arrow-java/issues/379
In Java 9/9+, within following module-info.java definition the build will
fail by error:
```Java
module my.app {
exports my.app;
requires arrow.memory.core;
requires arrow.memory.unsafe;
}
```
The error:
> java: the unnamed module reads package org.apache.arrow.memory from both
arrow.memory.core and arrow.memory.unsafe
It seems that JPMS requires a package to be read from at most one individual
module. Ref:
http://openjdk.java.net/projects/jigsaw/spec/sotms/#the-module-path. If so what
we may have to do is to conduct a code clean up for our maven modules to make
sure we don't populate codes in the same package into different libraries.
Also, as a more standardized practice, it's might be an option to put
entries with name **Automatic-Module-Name** into manifest files to tell
automatic module system to generate predefined module names rather than parsing
from jar file name. Ref:
https://docs.oracle.com/javase/9/docs/api/java/lang/module/ModuleFinder.html#automatic-modules
Note that it's not a goal for this topic to migrate to Java 9/9+.
**Reporter**: [Hongze
Zhang](https://issues.apache.org/jira/browse/ARROW-12905) / @zhztheplayer
<sub>**Note**: *This issue was originally created as
[ARROW-12905](https://issues.apache.org/jira/browse/ARROW-12905). Please see
the [migration documentation](https://github.com/apache/arrow/issues/14542) for
further details.*</sub>
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