{"record":{"id":"0e77b85a108ce80a","repo":"nathanmarz/storm","slug":"could-not-find-a-section-entry-in-this-configuration","errorCode":null,"errorMessage":"Could not find a '${section}' entry in this configuration.","messagePattern":"Could not find a '(.+?)' entry in this configuration\\.","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"storm-core/src/jvm/backtype/storm/security/auth/AuthUtils.java","lineNumber":87,"sourceCode":"     */\n    public static ITransportPlugin GetTransportPlugin(Map storm_conf, Configuration login_conf) {\n        ITransportPlugin  transportPlugin = null;\n        try {\n            String transport_plugin_klassName = (String) storm_conf.get(Config.STORM_THRIFT_TRANSPORT_PLUGIN);\n            Class klass = Class.forName(transport_plugin_klassName);\n            transportPlugin = (ITransportPlugin)klass.newInstance();\n            transportPlugin.prepare(storm_conf, login_conf);\n        } catch(Exception e) {\n            throw new RuntimeException(e);\n        } \n        return transportPlugin;\n    }\n\n    public static String get(Configuration configuration, String section, String key) throws IOException {\n        AppConfigurationEntry configurationEntries[] = configuration.getAppConfigurationEntry(section);\n        if (configurationEntries == null) {\n            String errorMessage = \"Could not find a '\"+ section + \"' entry in this configuration.\";\n            throw new IOException(errorMessage);\n        }\n\n        for(AppConfigurationEntry entry: configurationEntries) {\n            Object val = entry.getOptions().get(key); \n            if (val != null) \n                return (String)val;\n        }\n        return null;\n    }\n}\n\n","sourceCodeStart":69,"sourceCodeEnd":99,"githubUrl":"https://github.com/nathanmarz/storm/blob/cdb116e942666973bc4eaa0df098d5bab82739e7/storm-core/src/jvm/backtype/storm/security/auth/AuthUtils.java#L69-L99","documentation":"AuthUtils.get(Configuration, section, key) reads a named option from a section of a loaded JAAS login Configuration. It throws IOException when configuration.getAppConfigurationEntry(section) returns null, i.e. the JAAS file loaded successfully but has no entry with the requested section name (e.g. \"ServerClient\" or the topology-specific section).","triggerScenarios":"Calling AuthUtils.get(loginConf, section, key) where the loaded JAAS configuration has no block matching `section` — e.g. requesting section \"StormClient\"/\"StormServer\" while the login file only defines other section names, or passing a topology-name-derived section that the login file doesn't define.","commonSituations":"JAAS file uses nonstandard section names while code expects Storm's conventional ones (StormClient, StormServer, Client, Server); copy-pasting a Kafka/ZooKeeper JAAS file with sections like KafkaClient; missing topology-specific sections required by SASL transport plugins.","solutions":["Add the missing section to the JAAS login configuration file, e.g. `StormClient { org.apache.storm.security.auth.kerberos.KerberosLoginModule required ...; };`.","Rename the section in the JAAS file to match the section name the code requests.","Verify which section name is passed to AuthUtils.get / the transport plugin and align it with the file.","Regenerate the login file from Storm's documented SASL setup so standard sections are present."],"exampleFix":"// before (jaas.conf)\nClient { com.sun.security.auth.module.Krb5LoginModule required ...; };\n// after\nStormClient { org.apache.storm.security.auth.kerberos.KerberosLoginModule required\n  useKeyTab=true keyTab=\"/etc/storm/storm.keytab\" principal=\"storm@REALM\";\n};","handlingStrategy":"validation","validationCode":"// Java\nAppConfigurationEntry[] entries = configuration.getAppConfigurationEntry(section);\nif (entries == null) throw new IllegalStateException(\"JAAS file lacks section '\" + section + \"'; add it or fix the section name\");","typeGuard":"boolean hasSection(Configuration c, String section) {\n    return c.getAppConfigurationEntry(section) != null;\n}","tryCatchPattern":"try {\n    String value = AuthUtils.get(configuration, section, key);\n} catch (IOException e) {\n    if (e.getMessage().contains(\"entry in this configuration\")) {\n        LOG.error(\"Section '\" + section + \"' missing from JAAS config; expected StormClient/StormServer blocks\");\n    }\n    throw e;\n}","preventionTips":["Use Storm's conventional JAAS section names (StormClient, StormServer) in login files.","Diff your JAAS file against the Storm SASL documentation template.","When reusing JAAS files from other services (Kafka, ZK), add the Storm-required sections rather than renaming them."],"tags":["security","configuration","jaas"],"backgroundTag":"missing-config-key","analyzedSha":"cdb116e942666973bc4eaa0df098d5bab82739e7","analyzedAt":"2026-09-12T14:30:00.714Z","contentChangedAt":"2026-09-12T14:30:00.714Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}