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https://issues.apache.org/jira/browse/MCOMPILER-205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390065#comment-16390065
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Robert Scholte commented on MCOMPILER-205:
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I see there's some confusion, so something needs to be changed, maybe improving
documentation is good enough.
Looking at the code, you'll see that non-incremental will only look at changed
sourcefiles. Incremental will also verifies if dependencies have changed and if
files have been added or removed. If it has changed, it'll remove the complete
classes-directory. The reason is that the default java compiler is quite fast,
likely much faster than analyzing per file what to do with it.
IIUC the eclipse compiler is a real incremental compiler, so we could decide
that based that based on the used compiler not to drop the classes directory.
> 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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