{"record":{"id":"6c5e0567a4bf45ab","repo":"apache/flink","slug":"error-while-opening-jar-file-jarfile-getpath","errorCode":null,"errorMessage":"Error while opening jar file '{jarFile.getPath()}'. {ioex.getMessage()}","messagePattern":"Error while opening jar file '(.+?)'\\. (.+?)","errorType":"exception","errorClass":"ProgramInvocationException","httpStatus":null,"severity":"error","filePath":"flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java","lineNumber":399,"sourceCode":"                    \"An error occurred while invoking the program's main method: \" + t.getMessage(),\n                    t);\n        }\n    }\n\n    private static String getEntryPointClassNameFromJar(URL jarFile)\n            throws ProgramInvocationException {\n        JarFile jar;\n        Manifest manifest;\n        String className;\n\n        // Open jar file\n        try {\n            jar = new JarFile(new File(jarFile.toURI()));\n        } catch (URISyntaxException use) {\n            throw new ProgramInvocationException(\n                    \"Invalid file path '\" + jarFile.getPath() + \"'\", use);\n        } catch (IOException ioex) {\n            throw new ProgramInvocationException(\n                    \"Error while opening jar file '\"\n                            + jarFile.getPath()\n                            + \"'. \"\n                            + ioex.getMessage(),\n                    ioex);\n        }\n\n        // jar file must be closed at the end\n        try {\n            // Read from jar manifest\n            try {\n                manifest = jar.getManifest();\n            } catch (IOException ioex) {\n                throw new ProgramInvocationException(\n                        \"The Manifest in the jar file could not be accessed '\"\n                                + jarFile.getPath()\n                                + \"'. \"\n                                + ioex.getMessage(),","sourceCodeStart":381,"sourceCodeEnd":417,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java#L381-L417","documentation":"Thrown by getEntryPointClassNameFromJar when new JarFile(...) raises an IOException while opening the jar file. The file exists as a path but cannot be read as a valid ZIP/JAR archive.","triggerScenarios":"The jar file path resolves but JarFile cannot open it: file not found, permission denied, truncated download, or the file is not a valid ZIP container.","commonSituations":"Incomplete jar download (truncated transfer); the path points to a directory or a plain file instead of a jar; filesystem permission issues; the jar was overwritten while being read.","solutions":["Verify the file exists, is readable, and is a valid jar (unzip -l <jar> or jar tf <jar>).","Re-download/rebuild the jar to rule out truncation or corruption.","Check filesystem permissions for the Flink process on the jar path.","Ensure the path points to a file, not a directory."],"exampleFix":null,"handlingStrategy":"validation","validationCode":"if (!jarFile.isFile()) {\n    throw new IllegalArgumentException(\"Not a regular file: \" + jarFile);\n}\nif (!jarFile.canRead()) {\n    throw new IllegalArgumentException(\"Jar not readable: \" + jarFile);\n}\n// Sanity-check it is a ZIP\ntry (RandomAccessFile raf = new RandomAccessFile(jarFile, \"r\")) {\n    long n = raf.length();\n    raf.seek(n - 22);\n    byte[] end = new byte[4]; raf.readFully(end);\n    if (end[0] != 0x50 || end[1] != 0x4b) throw new IllegalArgumentException(\"Not a valid jar/zip\");\n}","typeGuard":null,"tryCatchPattern":"try {\n    PackagedProgram.newBuilder().setJarFile(jarFile).build();\n} catch (ProgramInvocationException pie) {\n    if (pie.getMessage().startsWith(\"Error while opening jar file\")) {\n        // verify file integrity / permissions, re-download\n    }\n    throw pie;\n}","preventionTips":["Verify jar integrity (unzip -t / jar tf) before submission.","Re-download jars from a trusted source and checksum them.","Ensure the Flink process has read permission on the jar path."],"tags":["packaged-program","jar","io","corruption"],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}