[jira] [Commented] (MCOMPILER-278) Incremental build does not track inter-module dependencies.

["Robert Scholte (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MCOMPILER-278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15579818#comment-15579818 ] 

Robert Scholte commented on MCOMPILER-278:
------------------------------------------

Please provide a new patch (attach it as file) and only change code related to this issue. It is now impossible to see what's actually done. An integration-test would help, but that's probably hard to create in this case, one of use will help with that.

> Incremental build does not track inter-module dependencies.
> -----------------------------------------------------------
>
>                 Key: MCOMPILER-278
>                 URL: https://issues.apache.org/jira/browse/MCOMPILER-278
>             Project: Maven Compiler Plugin
>          Issue Type: Bug
>    Affects Versions: 3.1
>            Reporter: Michael Zav'yalov
>
> When useIncrementalCompilation=true the plugin actually assumes that this incremental compilation is supported by compiler itself (I state it because of all source files are always sent to compiler).
> But plugin provides an additional optimization - it can detect that there are no changes at all, so calling compiler can be skipped. It is especially critical for javac that does not support incremental build since 1.3.
> Unfortunately, plugin ignores claspath dependencies that are not directory, i.e. - jars, so when dependent jar is modified (in incompatible way) - our project is not re-compiled.



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