{"record":{"id":"a8a720cfcee0fa41","repo":"apache/flink","slug":"url-is-invalid-this-should-not-happen","errorCode":null,"errorMessage":"URL is invalid. This should not happen.","messagePattern":"URL is invalid\\. This should not happen\\.","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java","lineNumber":279,"sourceCode":"    }\n\n    /** Returns all provided libraries needed to run the program. */\n    public List<URL> getJobJarAndDependencies() {\n        return getJobJarAndDependencies(jarFile, extractedTempLibraries, isPython);\n    }\n\n    private static List<URL> getJobJarAndDependencies(\n            URL jarFile, List<File> extractedTempLibraries, boolean isPython) {\n        List<URL> libs = new ArrayList<>(extractedTempLibraries.size() + 2);\n\n        if (jarFile != null) {\n            libs.add(jarFile);\n        }\n        for (File tmpLib : extractedTempLibraries) {\n            try {\n                libs.add(tmpLib.getAbsoluteFile().toURI().toURL());\n            } catch (MalformedURLException e) {\n                throw new RuntimeException(\"URL is invalid. This should not happen.\", e);\n            }\n        }\n        if (isPython) {\n            libs.add(PackagedProgramUtils.getPythonJar());\n        }\n        return libs;\n    }\n\n    /** Returns all provided libraries needed to run the program. */\n    public static List<URL> getJobJarAndDependencies(\n            File jarFile, @Nullable String entryPointClassName) throws ProgramInvocationException {\n        URL jarFileUrl = loadJarFile(jarFile);\n\n        List<File> extractedTempLibraries =\n                jarFileUrl == null\n                        ? Collections.emptyList()\n                        : extractContainedLibraries(jarFileUrl);\n","sourceCodeStart":261,"sourceCodeEnd":297,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java#L261-L297","documentation":"Thrown by PackagedProgram.getJobJarAndDependencies(URL, List<File>, boolean) when converting a temporary extracted library File to a URL via toURI().toURL() raises MalformedURLException. The message 'This should not happen' signals that this conversion is expected to always succeed for valid File instances; it is a defensive RuntimeException wrapper.","triggerScenarios":"A File in extractedTempLibraries whose absolute path cannot be turned into a valid URL. In practice this only occurs if the file path contains characters that violate URL/URI encoding rules in an unusual way, or if the File object is in an inconsistent state.","commonSituations":"Extremely rare; typically indicates a corrupt temp directory, an exotic filesystem path, or a JVM/OS path-encoding edge case. Not user-facing under normal operation.","solutions":["Inspect the File path that failed (log extractedTempLibraries) for unusual characters or null components.","Ensure the system temp dir is writable, stable, and uses a conventional encoding (UTF-8).","If reproducible, report as a Flink bug — the conversion of a valid File to a URL is contractually expected to succeed.","Clear the Flink temp/extracted-libraries directory and retry the job submission."],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// Defensive check before constructing URLs from extracted libraries\nfor (File f : extractedTempLibraries) {\n    if (f == null || f.getAbsolutePath() == null) {\n        throw new IllegalStateException(\"Extracted library file is null or has no absolute path\");\n    }\n}","typeGuard":null,"tryCatchPattern":"try {\n    List<URL> urls = PackagedProgram.getJobJarAndDependencies(jarFile, extractedLibs, isPython);\n} catch (RuntimeException re) {\n    if (re.getMessage().contains(\"URL is invalid\")) {\n        // log the file list and the temp dir for diagnosis\n    }\n    throw re;\n}","preventionTips":["Keep the Flink temp directory on a conventional local filesystem with UTF-8 paths.","Avoid non-ASCII or unusual characters in jar/dependency paths."],"tags":["packaged-program","url","filesystem","defensive"],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}