Raffaele created MSHADE-128:
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Summary: Too many warnings "We have duplicates"
Key: MSHADE-128
URL: https://jira.codehaus.org/browse/MSHADE-128
Project: Maven 2.x Shade Plugin
Issue Type: Improvement
Affects Versions: 1.7.1
Reporter: Raffaele
Attachments: pom.xml, warning-we-have-duplicates.patch
When creating an uberjar, sometimes the same class is present in two or more
dependencies' JARs. For each class, maven-shade-plugin issues a WARNING We have
a duplicate in.
This is annoying and can muddle newcomers up (like myself), because it's not
clear how to fix.
I don't know if a programmatic solution to these warnings could exist: maybe it
will always require human interaction. However, it's better to point users in
the right direction and not spit out thousands of useless warnings.
Attached is a pom which triggers thousands of warnings and a patch with a
prettier (and hopefully more useful) output like
[WARNING] bcprov-jdk14-138.jar, bcprov-jdk14-1.38.jar define 1292 overlappping
classes:
[WARNING] - org.bouncycastle.asn1.ocsp.ResponderID
[WARNING] - org.bouncycastle.crypto.params.DSAPublicKeyParameters
[WARNING] - org.bouncycastle.crypto.engines.DESEngine
[WARNING] - org.bouncycastle.jce.provider.JCEElGamalPrivateKey
[WARNING] - org.bouncycastle.jce.provider.JCEStreamCipher$Skipjack_CFB8
[WARNING] - org.bouncycastle.jce.provider.JCESecretKeyFactory
[WARNING] - org.bouncycastle.i18n.filter.UntrustedInput
[WARNING] - org.bouncycastle.asn1.x9.X962NamedCurves$5
[WARNING] - org.bouncycastle.jce.X509KeyUsage
[WARNING] maven-shade-plugin has detected that some .class files
[WARNING] are present in two or more JARs. When this happens, only
[WARNING] one single version of the class is copied in the uberjar.
[WARNING] Usually this is not harmful and you can skeep these
[WARNING] warnings, otherwise try to manually exclude artifacts
[WARNING] based on mvn dependency:tree -Ddetail=true and the above
[WARNING] output
[WARNING] See http://docs.codehaus.org/display/MAVENUSER/Shade+Plugin
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