{"record":{"id":"0068612f693f8ab1","repo":"apache/dolphinscheduler","slug":"cannot-find-taskchannel-for","errorCode":null,"errorMessage":"Cannot find TaskChannel for : ","messagePattern":"Cannot find TaskChannel for : ","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"critical","filePath":"dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/TaskPluginManager.java","lineNumber":67,"sourceCode":"            String factoryName = entry.getKey();\n            TaskChannelFactory factory = entry.getValue();\n\n            taskChannelMap.put(factoryName, factory.create());\n            log.info(\"Success register task plugin: {}\", factoryName);\n        }\n\n    }\n\n    /**\n     * Get the TaskChannel by type, if the TaskChannel is not found, will throw\n     * @param type task type, cannot be null\n     * @throws IllegalArgumentException if the TaskChannel is not found\n     */\n    public static TaskChannel getTaskChannel(String type) {\n        checkNotNull(type, \"type cannot be null\");\n        TaskChannel taskChannel = taskChannelMap.get(type);\n        if (taskChannel == null) {\n            throw new IllegalArgumentException(\"Cannot find TaskChannel for : \" + type);\n        }\n        return taskChannel;\n    }\n\n    /**\n     * Check if the task parameters is validated\n     * @param taskType task type, cannot be null\n     * @param taskParams task parameters\n     * @return true if the task parameters is validated, otherwise false\n     * @throws IllegalArgumentException if the TaskChannel is not found\n     * @throws IllegalArgumentException if cannot deserialize the task parameters\n     */\n    public static boolean checkTaskParameters(String taskType, String taskParams) {\n        AbstractParameters abstractParameters = parseTaskParameters(taskType, taskParams);\n        return abstractParameters.checkParameters();\n    }\n\n    /**","sourceCodeStart":49,"sourceCodeEnd":85,"githubUrl":"https://github.com/apache/dolphinscheduler/blob/02eac45a1b6676e639fcbfb4be2243de5771b05d/dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/TaskPluginManager.java#L49-L85","documentation":"TaskPluginManager.getTaskChannel looks up the registered TaskChannel by task type and throws IllegalArgumentException when the type is not in taskChannelMap. It means no task plugin is installed/registered for the requested task type.","triggerScenarios":"getTaskChannel(type) with a type string absent from taskChannelMap — misspelled taskType, plugin jar not loaded, or calling before TaskPluginManager.loadTaskChannel() plugin installation runs.","commonSituations":"Plugin directory missing the plugin jar on the worker/master (incomplete deployment); custom task type not registered; workflow JSON from a newer version referencing a plugin absent in this installation; typo in task type passed to the API.","solutions":["Install/verify the plugin: mvn the matching dolphinscheduler-task-<type> module or copy its jar to the task-plugin dir","Check worker logs that taskChannelMap loaded the plugin at startup","Verify the task type string spelling matches the plugin's name","Align workflow definitions with installed plugin versions after upgrade","Call TaskPluginManager.loadTaskChannel()/install logic before lookups in embedded usage"],"exampleFix":"// before\nTaskChannel channel = TaskPluginManager.getTaskChannel(taskType);\n// after\nif (!TaskPluginManager.checkTaskTypeExists(taskType)) {\n    throw new IllegalStateException(\"Plugin not installed for type: \" + taskType);\n}\nTaskChannel channel = TaskPluginManager.getTaskChannel(taskType);","handlingStrategy":"validation","validationCode":"// before use\nif (!TaskPluginManager.checkTaskTypeExists(taskType)) {\n    throw new IllegalArgumentException(\"Plugin not installed for task type: \" + taskType);\n}\nTaskChannel ch = TaskPluginManager.getTaskChannel(taskType);","typeGuard":null,"tryCatchPattern":"try {\n    TaskChannel ch = TaskPluginManager.getTaskChannel(taskType);\n} catch (IllegalArgumentException e) {\n    log.error(\"Missing task plugin: {}\", e.getMessage());\n    // surface a deployment/installation problem, not a user error\n}","preventionTips":["Install all dolphinscheduler-task-* plugins on master and worker","Check startup logs that plugins loaded into taskChannelMap","Keep plugin set in sync with workflow definitions across upgrades","Validate task type strings against known plugin names"],"tags":["plugin","task-channel","not-found"],"backgroundTag":"missing-dependency","analyzedSha":"02eac45a1b6676e639fcbfb4be2243de5771b05d","analyzedAt":"2026-09-06T17:43:00.555Z","contentChangedAt":"2026-09-06T17:43:00.555Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}