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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 Thu, 19 Mar 2015 22:26:18 GMT

    [ https://jira.codehaus.org/browse/MSHADE-183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=365437#comment-365437
] 

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

Note that this is still broken with Maven 3.3.1.  This is a blocking issue for me and I have
moved back to maven-assembly-plugin.

> 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
> {code:xml}       
> <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>
> {code}
> 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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