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Posted to issues@flink.apache.org by "JinkunLiu (via GitHub)" <gi...@apache.org> on 2026/02/17 07:27:03 UTC
[I] [Bug] [Example] Missing flink-json dependency causes ValidationException in WorkflowMultipleAgentExample [flink-agents]
JinkunLiu opened a new issue, #540:
URL: https://github.com/apache/flink-agents/issues/540
### Search before asking
- [x] I searched in the [issues](https://github.com/apache/flink-agents/issues) and found nothing similar.
### Description
When running the WorkflowMultipleAgentExample in local, the application fails to start due to a ValidationException.
The example code attempts to create a table source using the 'format'='json' option:
```java
// WorkflowMultipleAgentExample.java
tableEnv.createTemporaryTable(
"product_reviews",
TableDescriptor.forConnector("filesystem")
// ...
.option("format", "json") // Requires flink-json on classpath
// ...
.build());
```
However, the flink-json dependency is not explicitly declared in examples/pom.xml (or ide-support/pom.xml), cause finding for the JSON format factory failed.
### How to reproduce
1. Run the main method of class `org.apache.flink.agents.examples.WorkflowMultipleAgentExample` in IDE.
2. The execution fails with the exception below.
### Stack Trace
```
Exception in thread "main" org.apache.flink.table.api.ValidationException: Unable to create a source for reading table 'default_catalog.default_database.product_reviews'.
...
Caused by: org.apache.flink.table.api.ValidationException: Could not find any format factory for identifier 'json' in the classpath.
at org.apache.flink.connector.file.table.FileSystemTableSource.<init>(FileSystemTableSource.java:118)
at org.apache.flink.connector.file.table.FileSystemTableFactory.createDynamicTableSource(FileSystemTableFactory.java:78)
at org.apache.flink.table.factories.FactoryUtil.createDynamicTableSource(FactoryUtil.java:241)
...
```
### Version and environment
version: main branch, after this commit [b03e69ad](https://github.com/apache/flink-agents/issues/527)
### Are you willing to submit a PR?
- [x] I'm willing to submit a PR!
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Re: [I] [Bug] [Example] Missing flink-json dependency causes ValidationException in WorkflowMultipleAgentExample [flink-agents]
Posted by "JinkunLiu (via GitHub)" <gi...@apache.org>.
JinkunLiu commented on issue #540:
URL: https://github.com/apache/flink-agents/issues/540#issuecomment-3912825710
Hello @weiqingy.
Could you please take a look? If I have misunderstood anything, I'm happy to be corrected.
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Re: [I] [Bug] [Example] Missing flink-json dependency causes ValidationException in WorkflowMultipleAgentExample [flink-agents]
Posted by "xintongsong (via GitHub)" <gi...@apache.org>.
xintongsong closed issue #540: [Bug] [Example] Missing flink-json dependency causes ValidationException in WorkflowMultipleAgentExample
URL: https://github.com/apache/flink-agents/issues/540
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Re: [I] [Bug] [Example] Missing flink-json dependency causes ValidationException in WorkflowMultipleAgentExample [flink-agents]
Posted by "weiqingy (via GitHub)" <gi...@apache.org>.
weiqingy commented on issue #540:
URL: https://github.com/apache/flink-agents/issues/540#issuecomment-3919008932
Thanks for reporting this @JinkunLiu. You're right - commit b03e69ad added the WorkflowMultipleAgentExample which uses "format"="json" but missed adding the flink-json dependency. The fix you suggested is correct. Since you offered to submit a PR, feel free to go ahead. It should be a hotfix adding flink-json to examples/pom.xml and ide-support/pom.xml.
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