BanDuplicateClasses Performance Issue

[thomasnikolay]

We have a large Dependency with some big dependencies. The check for BanDuplicateClasses tooks over 10 minutes. The check consume the most time in

extra-enforcer-rules/src/main/java/org/apache/maven/plugins/enforcer/Hasher.java

Line 101 in 149c131

InputStream inputStream = jar.getInputStream( jar.getEntry( classFilePath ) );

to extract the file from the JAR for generating the hash value.

Is it possible to optimize this behavior? I think to cache the JAR could help instead of to read the JAR for each file again.

[slawekjaranowski]

@thomasnikolay if you can - please check rule code from PR on your project, should be better.