Hi!
I had some idea for detecting stale changes in maven which is pretty generic
The problem hits us if you compile BeanA and BeanA2 in a project where BeanA2
is using BeanA.
On a
$> mvn clean compile
you will get both BeanA.class and BeanA2.class in target/classes
Now delete BeanA.java
Currently (2.6-SNAPSHOT) the maven-compiler-plugin only compiles all sources
without doing any cleanup and thus BeanA.class will still remain in
target/classes.
That is clearly a bug as BeanA2 will be left broken, packaged into a broken
jar, ...
How can we avoid that?
Simple answer: A plugin which doesnt support those cases by the underlying took
(javac) must always first clean up the stuff it generated during the last
invocation.
How can we do that?
step 1: Start a DirectoryScanner and get all files in target/classes. Remember
this list!
step 2: Run the compiler
step 3: List all files in target/classes again and remove all files you found
in step 1. You will end up with a list of all files generated by the
compilation as result.
step 4: Store this list into
target/maven-status/maven-compiler-plugin/default/createdfiles.lst ('default'
is the plugin execution. We need this in case we have multiple <executions>).
On the next compile you just need to check if you have such a createdfiles.lst
file and then first remove all the files listed in it as step 0.
Then you can continue with step 1 from scratch.
We could easily create a utility class for it which keeps the state with methods
public class ChangeDetector /* TODO find better name */
{
File[] readPreviouslyDetectedFileList(File targetFile);
void recordFiles(File baseDir)
File[] detectNewFiles();
storeDetectedFileList(File targetFile)
}
This can e.g. also be used by the maven-resources-plugin to get rid of copied
resources which got deleted from src/main/resources.
Do you have a better idea? Any ideas for improving this?
And a big question: how can I get hold of the current <execution> id in a
plugin?
LieGrue,
strub
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