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https://issues.apache.org/jira/browse/MCOMPILER-205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677282#comment-16677282
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Robert Scholte commented on MCOMPILER-205:
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This is what's happening: if 1 file has been changed or removed, all files are
deleted and recompiled. This is in contrast with pure incremental, because
otherwise we need to analyze every other class if they use the changed class
and if its change should trigger a recompilation of this file as well.
We have integration tests which show the result if we would only recompile the
changed files. What's probably misleading is that IDEs can do that
automatically for you, which might suggest that only recompiling changed files
is enough.
> maven-compiler-plugin: incremental compilation broken
> -----------------------------------------------------
>
> Key: MCOMPILER-205
> URL: https://issues.apache.org/jira/browse/MCOMPILER-205
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.1
> Reporter: Lukas Fryc
> Priority: Major
> Attachments: hello.tgz, ignore-package-info.patch,
> no-class-in-java-file.zip, only-recompile-changed.patch
>
>
> When we do {{clean}} -> {{compile}} -> {{compile}}, all Java sources are
> re-compiled for second compilation steps:
> {code}
> [framework]$ mvn clean
> ...
> [framework]$ mvn compile
> ...
> [INFO] --- maven-compiler-plugin:3.1:compile (precompile-sources-for-cdk) @
> richfaces-framework ---
> [INFO] Changes detected - recompiling the module!
> [INFO] Compiling 915 source files to
> /mnt/workspace/workspaces/richfaces/richfaces5/framework/target/classes
> ...
> [framework]$ mvn compile
> ...
> [INFO] --- maven-compiler-plugin:3.1:compile (precompile-sources-for-cdk) @
> richfaces-framework ---
> [INFO] Changes detected - recompiling the module!
> [INFO] Compiling 915 source files to
> /mnt/workspace/workspaces/richfaces/richfaces5/framework/target/classes
> ...
> {code}
> The source code of the affected project:
> https://github.com/richfaces/richfaces5/tree/077dcfc0a46d03d7ba9a7ac3e701a4adfb834c71
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