apache/flink · error · FlinkException

An error occurred while extracting the user classpath.

Error message

An error occurred while extracting the user classpath.

What it means

Error "An error occurred while extracting the user classpath." thrown in apache/flink.

Source

Thrown at flink-clients/src/main/java/org/apache/flink/client/program/DefaultPackagedProgramRetriever.java:131

            Configuration configuration)
            throws FlinkException {
        List<URL> userClasspaths;
        try {
            final List<URL> classpathsFromUserLibDir =
                    getClasspathsFromUserLibDir(userLibDir, jarFile);
            final List<URL> classpathsFromUserArtifactDir =
                    getClasspathsFromArtifacts(userArtifacts, jarFile);
            final List<URL> classpathsFromConfiguration =
                    getClasspathsFromConfiguration(configuration);

            final List<URL> classpaths = new ArrayList<>();
            classpaths.addAll(classpathsFromUserLibDir);
            classpaths.addAll(classpathsFromUserArtifactDir);
            classpaths.addAll(classpathsFromConfiguration);

            userClasspaths = Collections.unmodifiableList(classpaths);
        } catch (IOException e) {
            throw new FlinkException("An error occurred while extracting the user classpath.", e);
        }

        final EntryClassInformationProvider entryClassInformationProvider =
                createEntryClassInformationProvider(
                        (userLibDir == null && userArtifacts == null) ? null : userClasspaths,
                        jarFile,
                        jobClassName,
                        programArgs);
        return new DefaultPackagedProgramRetriever(
                entryClassInformationProvider, programArgs, userClasspaths, configuration);
    }

    @VisibleForTesting
    static EntryClassInformationProvider createEntryClassInformationProvider(
            @Nullable Iterable<URL> userClasspath,
            @Nullable File jarFile,
            @Nullable String jobClassName,
            String[] programArgs)

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: An error occurred while extracting the user classpath.
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("An error occurred while extracting the user classpath.") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: An error occurred while extracting the user classpath.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: An error occurred while extracting the user classpath.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/562bbf76860024be. Report an issue: GitHub.