{"record":{"id":"9fda79b221fc4ed7","repo":"karatelabs/karate","slug":"failed-to-create-resource-from-classpath-path","errorCode":null,"errorMessage":"Failed to create resource from classpath: {path}","messagePattern":"Failed to create resource from classpath: (.+?)","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"karate-js/src/main/java/io/karatelabs/common/Resource.java","lineNumber":586,"sourceCode":"            }\n            if (url == null) {\n                url = ClassLoader.getSystemResource(relativePath);\n            }\n            if (url == null) {\n                throw new ResourceNotFoundException(path);\n            }\n            // Convert URL to Path for classpath resources\n            try {\n                Path resourcePath = urlToPath(url, null);\n                return new PathResource(resourcePath, FileUtils.WORKING_DIR.toPath(), true);\n            } catch (java.nio.file.ProviderNotFoundException e) {\n                // JAR file system provider not available (common in jpackage/JavaFX apps)\n                // Fall back to streaming the resource content (root defaults to SYSTEM_TEMP)\n                try (java.io.InputStream is = url.openStream()) {\n                    String content = FileUtils.toString(is);\n                    return new MemoryResource(content);\n                } catch (Exception ex) {\n                    throw new RuntimeException(\"Failed to create resource from classpath: \" + path, ex);\n                }\n            } catch (Exception e) {\n                throw new RuntimeException(\"Failed to create resource from classpath: \" + path, e);\n            }\n        } else if (path.startsWith(FILE_COLON)) {\n            // Handle file: prefix by stripping it and creating PathResource\n            String filePath = normalizePath(removePrefix(path));\n            return new PathResource(Path.of(filePath));\n        } else {\n            return new PathResource(Path.of(normalizePath(path)));\n        }\n    }\n\n    /**\n     * Scans classpath directories for resources with the given extension.\n     * Handles both file system classpath entries and JARs.\n     *\n     * @param classpathDir the classpath directory (without \"classpath:\" prefix)","sourceCodeStart":568,"sourceCodeEnd":604,"githubUrl":"https://github.com/karatelabs/karate/blob/a22eb90246d958d15a47bf436693d0121ad2812d/karate-js/src/main/java/io/karatelabs/common/Resource.java#L568-L604","documentation":"When a classpath resource is found but lives inside a JAR and the JAR file-system provider is unavailable (e.g. jpackage/JavaFX runtimes), Resource.path() falls back to streaming the resource's content into a MemoryResource. If even that streaming read fails (url.openStream() or decode error), it wraps the failure in this RuntimeException; the same message also wraps any other failure while converting the classpath URL to a PathResource.","triggerScenarios":"Classpath resource inside a JAR where urlToPath conversion fails AND the fallback openStream() also throws (corrupt jar, sealed/locked jar file, security policy blocking stream open); or an unexpected exception during the URL-to-Path conversion itself.","commonSituations":"Running a packaged app (jpackage) where the zipfs provider is missing; jar corrupted during deployment; resource stream blocked by a restrictive SecurityManager or module-access policy; reading from a jar being concurrently rewritten.","solutions":["Inspect the wrapped cause (ex) to see why the jar stream failed","Rebuild/redeploy the jar if it is corrupt; verify with jar tf","Avoid packaging restrictions: run with the resources exploded on the filesystem instead of inside a jar when using jpackage","Add the JDK zip file-system provider if missing (ensure a full JDK/JRE, not a stripped runtime image)"],"exampleFix":"// before (resource inside jar, stripped runtime without zipfs)\nResource r = Resource.path(\"classpath:config.json\");\n// after: ship config outside the jar and load via file path\nResource r = Resource.path(\"file:\" + System.getProperty(\"app.home\") + \"/config.json\");","handlingStrategy":"try-catch","validationCode":"// Java: prefer loading external config files directly when running packaged\nPath external = Paths.get(System.getProperty(\"app.home\"), \"config.json\");\nResource r = Files.exists(external)\n    ? Resource.path(\"file:\" + external)\n    : Resource.path(\"classpath:config.json\");","typeGuard":null,"tryCatchPattern":"try {\n    Resource r = Resource.path(\"classpath:config.json\");\n} catch (RuntimeException e) {\n    if (e.getMessage().startsWith(\"Failed to create resource from classpath:\")) {\n        logger.error(\"classpath fallback failed, cause: {}\", e.getCause());\n    }\n}","preventionTips":["Ship required resources outside the jar when using jpackage/stripped runtimes","Use a full JDK runtime image so the zip file-system provider is available","Verify jar integrity after deployment (jar tf)","Avoid concurrent rewrites of jars that are being read"],"tags":["classpath","jar","fallback-stream"],"backgroundTag":"file-open-failed","analyzedSha":"a22eb90246d958d15a47bf436693d0121ad2812d","analyzedAt":"2026-09-12T09:01:00.220Z","contentChangedAt":"2026-09-12T09:01:00.220Z","schemaVersion":2},"datasetVersion":"2026-09-16T19:17:19.609Z"}