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From "Andrew Gaul (JIRA)" <j...@codehaus.org>
Subject [jira] (MSHADE-183) Getting "Error creating shaded jar: java.util.jar.Attributes cannot be cast to java.lang.String" error when using ManifestResourceTransformer with Maven 3.2.5
Date Fri, 13 Feb 2015 19:54:18 GMT

    [ https://jira.codehaus.org/browse/MSHADE-183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=363285#comment-363285
] 

Andrew Gaul commented on MSHADE-183:
------------------------------------

This issue has become more acute with CI services like Travis upgrading to Maven 3.2.5:

https://travis-ci.org/andrewgaul/s3proxy/builds/50581682

> Getting "Error creating shaded jar: java.util.jar.Attributes cannot be cast to java.lang.String"
error when using ManifestResourceTransformer with Maven 3.2.5
> --------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MSHADE-183
>                 URL: https://jira.codehaus.org/browse/MSHADE-183
>             Project: Maven Shade Plugin
>          Issue Type: Bug
>            Reporter: Chris Heisterkamp
>         Attachments: manifest_resource_transformer_error.diff
>
>
> If you are using the ManifestResourceTransformer with empty values in the configuration
you will get a "Error creating shaded jar: java.util.jar.Attributes cannot be cast to java.lang.String"
error with Maven 3.2.5.
> Here as an example config that causes the problem
> {{        
> <configuration>
>   <transformers>
>     <transformer
>         implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
>       <manifestEntries>
>         <Main-Class>com.mycompany.app.App</Main-Class>
>         <Implementation-Build></Implementation-Build>
>       </manifestEntries>
>     </transformer>
>   </transformers>
> </configuration>
> }}
> I'm not sure what changed in populating the manifestEntries map but it looks like the
manifestEntries.entrySet() in ManifestResourceTransformer is now getting back Attributes objects
for the null values instead of null.  When the transformer calls getValue() on the Attributes
object you get the error.
> The fix was to make manifestEntries a Map<String, Object> instead of Map<String,
Attributes>. 



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