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What causes an "undefined method `getURLs' for #" error when starting Looker

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This is caused by trying to run Looker version 7.14 or earlier with a newer Java version that isn't supported yet. Make sure the jar is Looker version 7.16+ you're using Java 9+, or downgrade Java to JDK 8

Example full error

NoMethodError: undefined method `getURLs' for #<Java::JdkInternalLoader::ClassLoaders::AppClassLoader:0x58cda03f>

Did you mean? getClass



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