{"record":{"id":"f7a36fabae1a2c75","repo":"apache/flink","slug":"the-program-s-entry-point-class-classname-caus","errorCode":null,"errorMessage":"The program's entry point class '{className}' caused an exception during initialization: {t.getMessage()}","messagePattern":"The program's entry point class '(.+?)' caused an exception during initialization: (.+?)","errorType":"exception","errorClass":"ProgramInvocationException","httpStatus":null,"severity":"critical","filePath":"flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java","lineNumber":503,"sourceCode":"            throw new ProgramInvocationException(\n                    \"The program's entry point class '\"\n                            + className\n                            + \"' was not found in the jar file.\",\n                    e);\n        } catch (ExceptionInInitializerError e) {\n            throw new ProgramInvocationException(\n                    \"The program's entry point class '\"\n                            + className\n                            + \"' threw an error during initialization.\",\n                    e);\n        } catch (LinkageError e) {\n            throw new ProgramInvocationException(\n                    \"The program's entry point class '\"\n                            + className\n                            + \"' could not be loaded due to a linkage failure.\",\n                    e);\n        } catch (Throwable t) {\n            throw new ProgramInvocationException(\n                    \"The program's entry point class '\"\n                            + className\n                            + \"' caused an exception during initialization: \"\n                            + t.getMessage(),\n                    t);\n        } finally {\n            if (contextCl != null) {\n                Thread.currentThread().setContextClassLoader(contextCl);\n            }\n        }\n    }\n\n    /**\n     * Takes all JAR files that are contained in this program's JAR file and extracts them to the\n     * system's temp directory.\n     *\n     * @return The file names of the extracted temporary files.\n     * @throws ProgramInvocationException Thrown, if the extraction process failed.","sourceCodeStart":485,"sourceCodeEnd":521,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-clients/src/main/java/org/apache/flink/client/program/PackagedProgram.java#L485-L521","documentation":"A catch-all (Throwable) fallback thrown when Class.forName fails for a reason not covered by ClassNotFoundException, ExceptionInInitializerError, or LinkageError. This captures unexpected Throwables during entry-point class loading. The message includes the throwable's message for diagnostics.","triggerScenarios":"Any Throwable escaping Class.forName that is not one of the three specific catch blocks — e.g., a custom Error subclass, an unchecked exception thrown by a custom ClassLoader hook, or a ThreadDeath in edge cases.","commonSituations":"Custom ClassLoader implementations that throw non-standard errors, agent instrumentation interfering with class loading, or JVM internal errors during class verification.","solutions":["Read the chained Throwable cause for the specific failure type and message.","If the cause is JVM-internal (e.g., OutOfMemoryError), address the underlying resource issue.","Disable any custom Java agents or bytecode instrumentation to isolate the failure.","Reproduce locally with -verbose:class to trace the class loading attempt."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n    PackagedProgram.newBuilder()\n        .setJarFile(jarFile)\n        .setEntryPointClassName(className)\n        .build();\n} catch (ProgramInvocationException e) {\n    Throwable cause = e.getCause();\n    // log cause class and message for diagnosis of unexpected Throwable\n    throw e;\n}","preventionTips":["Run with -verbose:class to trace class loading failures locally.","Disable custom Java agents when diagnosing class-loading issues."],"tags":["packaged-program","class-loading","catch-all","initialization"],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}