apache/flink · error · IllegalArgumentException

Multiple JARs with manifest attribute for entry class: %s

Error message

Multiple JARs with manifest attribute for entry class: %s

What it means

Error "Multiple JARs with manifest attribute for entry class: %s" thrown in apache/flink.

Source

Thrown at flink-clients/src/main/java/org/apache/flink/client/deployment/application/JarManifestParser.java:87

     */
    static JarFileWithEntryClass findOnlyEntryClass(Iterable<File> jarFiles) throws IOException {
        List<JarFileWithEntryClass> jarsWithEntryClasses = new ArrayList<>();
        for (File jarFile : jarFiles) {
            findEntryClass(jarFile)
                    .ifPresent(
                            entryClass ->
                                    jarsWithEntryClasses.add(
                                            new JarFileWithEntryClass(jarFile, entryClass)));
        }
        int size = jarsWithEntryClasses.size();
        if (size == 0) {
            throw new NoSuchElementException("No JAR with manifest attribute for entry class");
        }
        if (size == 1) {
            return jarsWithEntryClasses.get(0);
        }
        // else: size > 1
        throw new IllegalArgumentException(
                "Multiple JARs with manifest attribute for entry class: " + jarsWithEntryClasses);
    }

    /**
     * Returns the entry class as specified in the manifest of the provided JAR file.
     *
     * <p>The following manifest attributes are checked in order to find the entry class:
     *
     * <ol>
     *   <li>{@link PackagedProgram#MANIFEST_ATTRIBUTE_ASSEMBLER_CLASS}
     *   <li>{@link PackagedProgram#MANIFEST_ATTRIBUTE_MAIN_CLASS}
     * </ol>
     *
     * @param jarFile JAR file to parse
     * @return Optional holding entry class
     * @throws IOException If there is an error accessing the JAR
     */
    @VisibleForTesting

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Multiple JARs with manifest attribute for entry class: the reported value
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Multiple JARs with manifest attribute for entry class: the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Multiple JARs with manifest attribute for entry class: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Multiple JARs with manifest attribute for entry class: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/c19d16281a2498b2. Report an issue: GitHub.