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https://issues.apache.org/jira/browse/MSHADE-428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17617642#comment-17617642
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Guillaume Nodet commented on MSHADE-428:
----------------------------------------
It may be better to enhance maven so that a warning is issue in case an xml
attribute / element can not be mapped during the mojo injection.
> Typo causes mysterious NPE in build
> -----------------------------------
>
> Key: MSHADE-428
> URL: https://issues.apache.org/jira/browse/MSHADE-428
> Project: Maven Shade Plugin
> Issue Type: Bug
> Reporter: Tamas Cservenak
> Priority: Major
>
> All versions are affected.
> Has this config for plugin:
> {noformat}
> <transformers>
> <transformer
> implementation="org.apache.maven.plugins.shade.resource.ComponentsXmlResourceTransformer"
> />
> <transformer
> implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"
> />
> <transformer
> implementatioh="org.apache.maven.plugins.shade.resource.SisuIndexResourceTransformer"
> />
> <transformer
> implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
> <manifestEntries>
>
> <Main-Class>org.apache.maven.index.cli.NexusIndexerCli</Main-Class>
> <Multi-Release>true</Multi-Release>
> </manifestEntries>
> </transformer>
> </transformers> {noformat}
> And build was failing with
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-shade-plugin:3.4.0:shade (default) on project
> indexer-cli: Error creating shaded jar: Problem shading JAR
> /home/cstamas/Worx/apache-maven/maven-indexer/indexer-cli/target/indexer-cli-7.0.0-SNAPSHOT.jar
> entry META-INF/sisu/javax.inject.Named: java.lang.NullPointerException ->
> [Help 1] {noformat}
> Cause: there is a typo in config, notive {{implementatioH}} for sisu
> transformer.
> This caused that list of transformes had a null element, and seems there is
> no validation that transformers list may not have null element. NPE happened
> when default shared method {{private boolean resourceTransformed(}} stepped
> onto null element and had {{null.canTransformResource( name )}}.
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