KaiSong-UK opened a new pull request, #18418:
URL: https://github.com/apache/dolphinscheduler/pull/18418
## Description
Fix DataX task failure when using custom JSON template with resource files.
### Problem
When users select "Custom template" (customConfig=1) and upload a JSON
resource file in the DataX task definition, the json field is set to {} (empty
object) instead of reading the resource file content. This causes DataX
execution to fail because the generated JSON has missing reader/writer plugin
configurations.
### Root Cause
In DataxTask.buildDataxJsonFile(), when customConfig == Flag.YES, the method
only uses dataXParameters.getJson() without checking if a resource file was
provided. The resource file is already downloaded to the execution path by the
framework, but the task code never reads it.
### Fix
When customConfig == YES and the json field is empty or "{}", check the
esourceList for JSON resource files. If found, read the first matching JSON
resource file from the execution directory and use its content as the DataX job
JSON.
Closes #18389
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