shashank created CAMEL-25304:
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Summary: camel-barcode - unmarshal fails with
NoTypeConversionAvailableException unless the body is a file (byte[] body,
image received over HTTP, marshal and unmarshal in one route)
Key: CAMEL-25304
URL: https://issues.apache.org/jira/browse/CAMEL-25304
Project: Camel
Issue Type: Bug
Components: camel-barcode
Reporter: shashank
{{BarcodeDataFormat.readImage}} converts the stream it gets from {{unmarshal}}
with
{code:java}
final BufferedInputStream in = exchange.getContext().getTypeConverter()
.mandatoryConvertTo(BufferedInputStream.class, stream);
{code}
The stream is a {{BufferedInputStream}} only when the body is a file
({{IOConverter.toInputStream(File)}} buffers). There is no type converter to
{{BufferedInputStream}} from a {{ByteArrayInputStream}} or a stream cache, so
for every other body unmarshal fails:
* a {{byte[]}} body (an image from JMS, Kafka, a database, an object store):
{{NoTypeConversionAvailableException: No type converter available to convert
from type: org.apache.camel.converter.stream.ByteArrayInputStreamCache to the
required type: java.io.BufferedInputStream}};
* an {{InputStream}} body, for example an upload received over HTTP: the same
with {{InputStreamCache}};
* {{.marshal(barcode).unmarshal(barcode)}} in one route: the same with
{{InputStreamCache}}.
The existing tests only unmarshal files, which is why this went unnoticed.
h3. Reproduction
New {{BarcodeUnmarshalStreamTest}}: unmarshal of a QR code PNG given as
{{byte[]}}, as {{ByteArrayInputStream}}, and marshal followed by unmarshal in
one route: all three fail on main with the exception above. The existing
file-based tests are the control.
h3. Proposed fix
Pass the stream to {{ImageIO.read}}, which reads any input stream, instead of
converting it. File bodies are read as before. Resource handling is unchanged:
{{ImageIO.read(InputStream)}} does not close the stream, and the caller does
({{UnmarshalProcessor}} for an {{InputStream}} body,
{{DataFormat.unmarshal(Exchange, Object)}} for the stream it converted the body
to). With the fix the module passes (29 tests).
Not in scope: a body that is not an image makes {{ImageIO.read}} return
{{null}} and the data format fail with a {{NullPointerException}} (before and
after the fix).
Found while checking the round trip property "unmarshal(marshal(text)) = text"
of the data format (see CAMEL-25303 about the character set; Lean 4 model
there): the round trip could not be run in a route. The Lean model of this step
only records which streams convert ({{main_fails_not_file}}, {{fix_total}});
the evidence is the test.
Affected: 4.14.x, 4.18.x and main (the same conversion since 3.0.0 at least).
Duplicate check (2026-10-03): JIRA component camel-barcode (4 issues) and text
"barcode" with "unmarshal" / "BufferedInputStream": none. GitHub pull requests
"barcode": none on this (open #22358 changes {{getOut()}} to {{getMessage()}}
in the same method, a trivial overlap).
_Filed with Claude Code on behalf of allthingssecurity._
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