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Life would become easier if there was a dedicated POM element like ${project.reporting.outputEncoding} which could be used to specify the encoding once per entire project. Every plugin could use it as default value, like it has been done with source files encoding:

/**
* @parameter expression="${outputEncoding}" default-value="${project.reporting.outputEncoding}"
*/
private String outputEncoding;

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For the record, the other proposed unified default value was source encoding as defined in Source File Encoding proposal, which would vary from project to project. Since users are invited to set a fixed value for source encoding in their poms to ensure build reproducibility, such calculated value wouldn't affect build reproducibility, but wouldn't have been appropriate in every case (for example, if project's description in pom.xml contains characters that can't be output with source files encoding).

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