shashank created CAMEL-25320:
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Summary: camel-core - the separator of @PropertyInject is used as
a regular expression: with | the value is split into single characters, with .
there are no values
Key: CAMEL-25320
URL: https://issues.apache.org/jira/browse/CAMEL-25320
Project: Camel
Issue Type: Bug
Components: camel-core
Reporter: shashank
{{CamelPostProcessorHelper}} splits an injected property value into an array, a
collection or a map with {{value.split(separator)}}
({{convertArrayUsingSeparator}}, {{convertCollectionUsingSeparator}},
{{convertMapUsingSeparator}}). {{String.split}} takes a regular expression; the
annotation documents a separator ("Used for splitting the property value into
an array/list of values. For example to use comma to separate the values.").
{code:java}
@PropertyInject(value = "hosts", separator = "|")
public List<String> hosts; // hosts=serverA|serverB -> [s, e, r, v, e,
r, A, |, s, ...]
{code}
With {{separator = "|"}} a list or array gets one element per character, a map
fails ({{NumberFormatException: For input string: ""}} for {{Map<String,
Integer>}}) or gets wrong entries, and with {{separator = "."}} the result is
empty.
h3. Reproduction
New {{PropertyInjectSeparatorTest}} (camel-core,
{{CamelPostProcessorHelper.getInjectionPropertyValue}} as
{{CamelPostProcessorHelperTest}} does): {{|}} for a list and a map and {{.}}
for an array fail on main (2 failures, 1 error); {{;}} is the control. Two runs.
h3. Proposed fix
{{Pattern.quote}} the separator in the three methods. The separators of the
documentation and tests ({{,}}, {{;}}) split exactly as before; an application
that escaped a separator (for example {{separator = "\\\\|"}}) must use the
separator itself, and a separator that relied on a regular expression (such as
{{"\\\\s+"}}) is no longer supported (the values are trimmed anyway); upgrade
guide entry next to the existing @PropertyInject section of CAMEL-25009. With
the fix the related tests pass (camel-core {{CamelPostProcessorHelper*}},
{{DefaultCamelBeanPostProcessor*}}, {{CamelBeanPostProcessor*}},
{{PropertyInject*}}: 47; camel-main {{MainIoC*}}: 9).
Found with a Lean 4 model of the split (shared with the camel-aws2-sqs
{{batchSeparator}} issue): "the values are the trimmed pieces between the
separators" fails on main for {{|}} and {{.}} for every value, and the fix is
proved equal to main for every separator character the model treats as plain
(only {{|}} and {{.}} are modelled as special; {{$}}, {{^}}, {{?}}, {{*}},
{{+}}, {{(}}, {{[}}, a backslash also fail on main, differently, and are not
covered by the proof).
Affected: 4.14.x, 4.18.x and main.
Duplicate check (2026-10-04): JIRA "PropertyInject" with "separator": none on
this; CAMEL-25009 (Claus, 2026-09-26) changed the same file without touching
the split. GitHub pull requests: none.
_Filed with Claude Code on behalf of allthingssecurity._
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