--- title: Closed-world assumption in Java | daily.dev description: Building a GraalVM Native Image from a Java application requires explicit configuration of reflection, proxies, and other dynamic mechanisms — unlike the JVM... canonical: https://daily.dev/posts/xkkbkuv02 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Closed-world assumption in Java | daily.dev og:description: Building a GraalVM Native Image from a Java application requires explicit configuration of reflection, proxies, and other dynamic mechanisms — unlike the JVM... og:url: https://daily.dev/posts/xkkbkuv02 og:image: https://api.daily.dev/og/posts/xkKbkuv02.png og:image:alt: Post cover image og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Closed-world assumption in Java **[Master Yoda](https://daily.dev/sources/biixj2rltcrx7bbvxfw0d)** · [@pump1it](https://daily.dev/pump1it) · 0 upvotes · 0 comments ## Summary Building a GraalVM Native Image from a Java application requires explicit configuration of reflection, proxies, and other dynamic mechanisms — unlike the JVM which handles these automatically at runtime. The reason lies in the closed-world assumption: Native Image performs ahead-of-time compilation and reachability analysis, so all execution paths must be known at compile time. The JVM acts as a dynamic runtime hub resolving symbolic references and method calls on the fly, but Native Image removes that hub entirely. A practical example using the Foreign Function & Memory API illustrates how a native call that works fine on the JVM fails in a native build without a configuration file describing the call signature. Configuration is therefore not a flaw but a fundamental consequence of moving Java's dynamic behavior into the static compilation world. ## Full article daily.dev links to this article rather than hosting it. 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