Null Resource for Checkstyle Configuration (Potential Bug) #1335
Description
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Problem: If checks.xml is not found in the classpath, getResourceAsStream returns null, which will cause a NullPointerException when passed to InputSource or later to ConfigurationLoader.loadConfiguration.
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Consequence: The application will fail with a cryptic error if the resource is missing.
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Fix: Check for null and throw a clear exception if the resource is not found.