Federico Mariani created CAMEL-23740:
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Summary: LangChain4jAgentConverter WrappedFile converter fails for
FTP/SFTP GenericFile — requires manual convertBodyTo workaround
Key: CAMEL-23740
URL: https://issues.apache.org/jira/browse/CAMEL-23740
Project: Camel
Issue Type: Bug
Components: camel-langchain4j-agent
Affects Versions: 4.20.0
Reporter: Federico Mariani
The _LangChain4jAgentConverter.toAiAgentBody(WrappedFile)_ type converter
assumes the wrapped file is always a _java.io.File_:
{code:java}
Object fileObj = wrappedFile.getFile();
if (!(fileObj instanceof File)) {
throw new IllegalArgumentException(
"WrappedFile must contain a java.io.File instance, got: " +
fileObj.getClass().getName());
}
{code}
This fails for FTP and SFTP components, which produce _GenericFile<FTPFile> /
GenericFile<SftpRemoteFile>_. The underlying file object is not a
_java.io.File_, so the converter throws IllegalArgumentException.
Since this is the most specific *@Converter* match for the body type, Camel
picks it over the byte[] or InputStream converters. The exception gets caught
by the route's error handler (retry + DLQ), making the failure silent and hard
to diagnose.
*Workaround*: Add _convertBodyTo: byte[]_ before _to: langchain4j-agent:..._ to
force the body through the byteArrayToAiAgentBody converter, which works
correctly (it detects MIME type from the CamelFileName header).
*Expected behavior*: The WrappedFile converter should handle remote file types
by falling back to reading the body as byte[] when getFile() does not return a
java.io.File. For example:
{code:java}
if (!(fileObj instanceof File)) {
byte[] data = exchange.getContext().getTypeConverter()
.convertTo(byte[].class, exchange, wrappedFile);
String mimeType = detectMimeTypeFromHeaders(exchange);
Content content = createContent(data, mimeType);
return buildAiAgentBody(exchange, content, "");
}
{code}
Affected components: camel-langchain4j-agent with camel-ftp or camel-ftp (SFTP)
*Reproducer*: A YAML route that reads images from FTP and sends them to
langchain4j-agent:
{code:java}
- route:
id: ftp-to-agent
from:
uri: "ftp:localhost:2121/images?noop=true&binary=true"
steps:
- setHeader:
name: CamelLangChain4jAgentUserMessage
constant:
expression: "Describe this image"
# Without this line, the WrappedFile converter fails silently
# - convertBodyTo:
# type: "byte[]"
- to:
uri: "langchain4j-agent:my-agent"
{code}
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