alibaba/DataX · error · IllegalArgumentException

您提供的配置文件有误. 路径[%s]需要配置Json格式的Map对象，但该节点发现实际类型是[%s]. 请检查您的配置并

Error message

您提供的配置文件有误. 路径[%s]需要配置Json格式的Map对象，但该节点发现实际类型是[%s]. 请检查您的配置并作出修改.

What it means

Thrown by Configuration.findObjectInMap while resolving a dotted configuration path: an intermediate node expected to be a JSON object (Map) turned out to be another type (List, String, number...). DataX's Configuration.get(path) walks the path segment by segment; if you index into a scalar or array with a key, this error fires and names both the path segment and the actual runtime class.

Source

Thrown at common/src/main/java/com/alibaba/datax/common/util/Configuration.java:974

		for (final String each : split2List(path)) {
			if (isPathMap(each)) {
				target = findObjectInMap(target, each);
				continue;
			} else {
				target = findObjectInList(target, each);
				continue;
			}
		}

		return target;
	}

	@SuppressWarnings("unchecked")
	private Object findObjectInMap(final Object target, final String index) {
		boolean isMap = (target instanceof Map);
		if (!isMap) {
			throw new IllegalArgumentException(String.format(
					"您提供的配置文件有误. 路径[%s]需要配置Json格式的Map对象，但该节点发现实际类型是[%s]. 请检查您的配置并作出修改.",
					index, target.getClass().toString()));
		}

		Object result = ((Map<String, Object>) target).get(index);
		if (null == result) {
			throw new IllegalArgumentException(String.format(
					"您提供的配置文件有误. 路径[%s]值为null，datax无法识别该配置. 请检查您的配置并作出修改.", index));
		}

		return result;
	}

	@SuppressWarnings({ "unchecked" })
	private Object findObjectInList(final Object target, final String each) {
		boolean isList = (target instanceof List);
		if (!isList) {
			throw new IllegalArgumentException(String.format(

View on GitHub (pinned to 80ec23d5c5)

Solutions

Inspect the job json at the reported path segment and make that node a JSON object {..}
Use [n] indexing (e.g. "job.content[0].reader") where the node is an array
Verify the exact configuration key path expected by the plugin/version in use

Example fix

// before
{"job": {"content": "myfile"}} 
conf.get("job.content.reader"); // throws
// after
{"job": {"content": [{"reader": {...}}]}}
conf.get("job.content[0].reader");

Defensive patterns

Strategy: type-guard

Validate before calling

// validate path shape against parsed json before deep get
Object node = conf.get("job.content");
if (!(node instanceof List)) throw new IllegalStateException("job.content must be an array");

Type guard

boolean isJsonObject(Object o) { return o instanceof Map; }

Try / catch

catch (IllegalArgumentException e) {
  if (e.getMessage() != null && e.getMessage().contains("需要配置Json格式的Map对象")) {
    // print the path + actual type, fix the json structure
  }
  throw e;
}

Prevention

Validate job json with a schema or example before running DataX
Use [n] for array nodes and .key for object nodes in paths
Unit-test config paths against sample job files

When it happens

Trigger: Calling configuration.get/set with a path like "job.content.reader" where "content" resolves to a String or the path crosses a list without [n] indexing; e.g. get("a.b") when "a" is "text".

Common situations: Job json structure mistake: nesting a map under a key that actually holds a scalar or array (e.g. "content": "..." instead of an object); plugin code reading a wrong key path after a config schema change; mixing [index] and .key navigation incorrectly.

Related errors

AI-assisted analysis of alibaba/DataX@80ec23d5c5 (2026-08-14). Data as JSON: /api/errors/d01f61de36a03c21. Report an issue: GitHub.