apache/flink · error · IllegalConfigurationException

Invalid character in value for {} : {}

Error message

Invalid character in value for {} : {}

What it means

Error "Invalid character in value for {} : {}" thrown in apache/flink.

Source

Thrown at flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/AbstractS3FileSystemFactory.java:198

        }

        LOG.debug("Creating S3 file system backed by {}", name);
        LOG.debug("Loading Hadoop configuration for {}", name);

        try {
            // create the Hadoop FileSystem
            org.apache.hadoop.conf.Configuration hadoopConfig =
                    hadoopConfigLoader.getOrLoadHadoopConfig();
            AbstractS3DelegationTokenReceiver.updateHadoopConfig(hadoopConfig);
            org.apache.hadoop.fs.FileSystem fs = createHadoopFileSystem();
            fs.initialize(getInitURI(fsUri, hadoopConfig), hadoopConfig);

            // load the entropy injection settings
            String entropyInjectionKey = flinkConfig.get(ENTROPY_INJECT_KEY_OPTION);
            int numEntropyChars = -1;
            if (entropyInjectionKey != null) {
                if (entropyInjectionKey.matches(INVALID_ENTROPY_KEY_CHARS)) {
                    throw new IllegalConfigurationException(
                            "Invalid character in value for "
                                    + ENTROPY_INJECT_KEY_OPTION.key()
                                    + " : "
                                    + entropyInjectionKey);
                }
                numEntropyChars = flinkConfig.get(ENTROPY_INJECT_LENGTH_OPTION);
                if (numEntropyChars <= 0) {
                    throw new IllegalConfigurationException(
                            ENTROPY_INJECT_LENGTH_OPTION.key() + " must configure a value > 0");
                }
            }

            final String[] localTmpDirectories =
                    ConfigurationUtils.parseTempDirectories(flinkConfig);
            Preconditions.checkArgument(localTmpDirectories.length > 0);
            final String localTmpDirectory = localTmpDirectories[0];
            final long s3minPartSize = flinkConfig.get(PART_UPLOAD_MIN_SIZE);
            final int maxConcurrentUploads = flinkConfig.get(MAX_CONCURRENT_UPLOADS);

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Invalid character in value for the reported value : 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 ("Invalid character in value for the reported value : the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Invalid character in value for the reported value : the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Invalid character in value for the reported value : the reported value.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/f62a61e847c8d72f. Report an issue: GitHub.