IM 7.2.0 → 7.3.0 — Apache Camel 4.18 Migration (§6)

Apache Camel 4.1.0 → 4.18.1 — Breaking Changes

Parent doc: upgrade-migration-guide-to-im-7-3-0.md
Confluence mirror: IM 7.2 → 7.3.0 — Apache Camel 4.1.0 → 4.18.1 — Breaking Changes

6. Apache Camel 4.1.0 → 4.18.1 LTS

Impact: HIGH | Type: DSL, Properties, API, Behavior

This upgrade spans 17 minor versions, each with breaking changes. Organized by category.

Coverage by the PFIMCORE-2957 migration script

The script (in im-upgrade-service) covers 66 of 70 (~94%) customer-facing breaking changes from §6 below. The 4 uncovered items are inherently un-detectable behavioral defaults — no source-level signal to match.

Section	Items	Covered	Method
§6.1 Property prefixes	6	6	Property regex + case-flip transforms
§6.2 XML DSL	10	10	Regex + XML DOM walker
§6.3 YAML/kamelet	(out of scope)	—	IM uses XML routes only; convert kamelets manually if any
§6.4 Simple operators	5	5	Regex
§6.5 File defaults	3	3	Advisories
§6.6 Data formats	10	10	Regex + advisories
§6.7 Health checks	4	3	Advisories (1 inherent gap: SupervisingRouteController defaults)
§6.8 Exchange API	10	9	Regex (ACTIVE_SPAN) + 7 advisories (1 inherent gap: stream buffer size)
§6.9 Secrets manager	2	2	Regex (delimiter) + property advisory (engine)
§6.10 REST DSL	7	5	Bundled `<rest>` advisory (5/7 detected separately; 2 sub-items mentioned in advisory text but inherently un-detectable: OpenAPI generation timing + property placeholder eager resolution)
§6.11 Removed components	7	7	URI/element route advisories
§6.12 Deprecated components	5	5	URI/element route advisories
§6.13 Template/Script	1	1	Advisory (silent breaker)
§6.14 IM-internal	6	—	Out of scope (IM framework code, not customer integrations)
Total (customer-facing)	70	66 (~94%)

6.1 Property Prefix Changes

Old Prefix	New Prefix	Version	Notes
`camel.springboot.*`	`camel.main.*`	Deprecated 4.5, removed 4.13	All prefixed properties must migrate
`camel.main.routeController*`	`camel.routecontroller.*`	4.4	Route controller properties
`camel.main.backlogTracing*`	`camel.trace.*`	4.5	Backlog tracing
`camel.main.debugger`	`camel.debug.enabled`	4.2	Debugger toggle
`camel.main.lightweight`	(removed)	4.11	Option no longer supported
`camel.server.*`	`camel.management.*`	4.14	Server management

IM Impact — properties migrated in default-application.properties and application.properties:

camel.springboot.main-run-controller → camel.main.main-run-controller
camel.springboot.xml-routes → camel.main.xml-routes
camel.springboot.xml-rests → camel.main.xml-rests
camel.springboot.use-mdc-logging → camel.main.use-mdc-logging
camel.springboot.stream-caching-spool-enabled → camel.main.stream-caching-spool-enabled
camel.springboot.shutdown-timeout → camel.main.shutdown-timeout
camel.springboot.jmx-enabled → camel.main.jmx-enabled
camel.springboot.jmx-management-statistics-level → camel.main.jmx-management-statistics-level

6.2 XML DSL Changes (affect customer routes)

Change	Version	Impact
Throttle EIP completely reworked	4.3	Customer routes using `<throttle>` MUST be rewritten
Resequence EIP attributes `stream-config` → `streamConfig`, `batch-config` → `batchConfig`	4.3	Customer routes using `<resequence>` may break
`<when>` → `<onWhen>` inside `<intercept>` and `<interceptSendToEndpoint>`	4.10	Customer routes may break
`headerName` → `source` on `<xpath>` and `<xquery>` (must prefix with `header:`)	4.4	Customer routes may break
`<xquery>` `type` → `resultType`	4.4	Customer routes may break
`<onFallback>` must be last in `<circuitBreaker>`	4.10	Customer routes may break
Bean `<property>` elements must now be wrapped in a `<properties>` container	4.6	Customer routes defining beans inline may break
Load balancer names changed (see table below)	4.7	Customer routes may break
`inheritErrorHandler` attribute moved from `<loadBalance>` to `<failoverLoadBalancer>`	4.10	Customer routes using fail-over load balancer may break
`bearer` → `bearerToken` in REST DSL	4.12	REST DSL routes

Throttle EIP Rework (4.3): Changed from "total requests per time period" to "concurrent requests" model.

XML

<!-- Old: 10 requests per 1000ms -->
<throttle><constant>10</constant></throttle>
<!-- New: 10 CONCURRENT requests (not per-second!) -->
<throttle><constant>10</constant></throttle>

The timePeriodMillis option should be removed. This is a fundamental semantic change.

XPath/XQuery headerName Change (4.4):

XML

<!-- Old -->
<xpath headerName="myHeader">/foo/bar</xpath>
<!-- New -->
<xpath source="header:myHeader">/foo/bar</xpath>

Load Balancer Renames (4.7):

Old Name	New Name
`failOver`	`failoverLoadBalancer`
`random`	`randomLoadBalancer`
`roundRobin`	`roundRobinLoadBalancer`
`sticky`	`stickyLoadBalancer`
`topic`	`topicLoadBalancer`
`weighted`	`weightedLoadBalancer`

6.3 YAML DSL / Kamelet Changes (affect customer kamelets)

Change	Version	Impact
Kebab-case removed entirely	4.13	Customer kamelets WILL break
`streamCaching` → `streamCache`	4.6	YAML routes
Bean `property` element renamed to `properties` (with simplified syntax)	4.6	YAML routes defining beans inline may break
`typeFilter` changed from list of elements to single comma-separated string	4.15	YAML data format config
`routePolicy` → `routePolicyRef`	4.18	YAML route config
`noErrorHandler` default: `true` → `false` in kamelets	4.10	Kamelets now inherit route error handler
Kamelet endpoint parameters now parsed in raw mode	4.16	URI-encoding behavior change for sensitive parameters (passwords, keys)
Kamelet routes no longer registered as JMX MBeans by default	4.5	Kamelet visibility/metrics in JMX

Kebab-case → camelCase mapping:

Old (kebab-case)	New (camelCase)
`set-header`	`setHeader`
`set-body`	`setBody`
`set-property`	`setProperty`
`remove-header`	`removeHeader`
`remove-headers`	`removeHeaders`
`remove-property`	`removeProperty`
`convert-body-to`	`convertBodyTo`
`to-d`	`toD`
`wire-tap`	`wireTap`
`do-try`	`doTry`
`do-catch`	`doCatch`
`do-finally`	`doFinally`
`dead-letter-channel`	`deadLetterChannel`
`no-error-handler`	`noErrorHandler`
`error-handler`	`errorHandler`

IM Impact: All .kamelet.yaml files migrated (set-header → setHeader, set-body → setBody).

6.4 Simple Language Operator Removals (affect customer routes)

Camel 4.18 removed these deprecated binary operators:

Old Operator	New Operator
`not contains`	`!contains`
`not regex`	`!regex`
`not range`	`!range`
`starts with`	`startsWith`
`ends with`	`endsWith`

Customer Action Required: Scan all XML route files for these operators.

6.5 File Component Behavior Changes (affect customer routes)

Change	Version	Impact
`eagerMaxMessagesPerPoll` default: `false` → `true`	4.13	File polling behavior changes — `maxMessagesPerPoll` now applied BEFORE sorting instead of after
`idempotentEager` default changed to `true`	4.7	Idempotent file consumers
File name header includes relative paths with `recursive=true`	4.10	File processing routes

Customer Action Required: If using maxMessagesPerPoll with sorting, explicitly set eagerMaxMessagesPerPoll=false.

6.6 Data Format Changes

Change	Version	Impact
`camel-jackson` default `unmarshalType`: `HashMap` → `LinkedHashMap`	4.12	JSON/XML unmarshalling now preserves key order
Jackson option `useWriter` → `combineUnicodeSurrogates`	4.9	Affects multi-byte character handling
CSV `formatRef`/`formatName` → `format`	4.15	CSV data format config
CSV `header` changed from `List<String>` to comma-separated `String`	4.15	CSV header config
Flatpack `parserFactoryRef` → `parserFactory`	4.15	Flatpack config
JAXB/SOAP `namespacePrefixRef` → `namespacePrefix`	4.15	JAXB/SOAP config
SOAP `elementNameStrategyRef` → `elementNameStrategy`	4.15	SOAP config
Crypto `algorithmParameterRef` → `algorithmParameterSpec`, `keyRef` → `key`, `initVectorRef` → `initVector`	4.15	Crypto data format config
SwiftMx `readConfigRef` → `readConfig`, `writeConfigRef` → `writeConfig`	4.15	SwiftMx data format config
XML Security `keyOrTrustStoreParametersRef` → `keyOrTrustStoreParameters`	4.15	xmlSecurity data format config

6.7 Health Check Changes

Change	Version
Routes with `auto-startup=false` report as `UP`	4.7
SupervisingRouteController: `UnhealthyOnExhausted` and `UnhealthyOnRestarting` default to `true`	4.7
FTP producer health checks added	4.17
Health/metrics paths: `/q/` → `/observe/`	4.14

6.8 Exchange API Changes

Change	Version
`Exchange.getCreated()` deprecated, use `getClock()`	4.4
Intercepted endpoint: header → exchange property	4.5
`Exchange.BEAN_METHOD_NAME` header removed	4.11
`Exchange.ACTIVE_SPAN` → `Exchange.OTEL_ACTIVE_SPAN`	4.9
`DefaultExchangeHolder` includes exchange variables	4.8
`HeaderFilterStrategy` case-insensitive by default	4.12
Stream buffer size: 4096 → 16384 bytes	4.8
WireTap deep-copies `StreamCache` bodies	4.7
WireTap `Exchange.CORRELATION_ID` no longer set on the copied exchange	4.4
JMS default header filter strategy now removes `Camel…` headers — use `ClassicJmsHeaderFilterStrategy` for legacy behavior	4.9

6.9 Secrets Manager Syntax Change (4.9)

# Old
{{hashicorp:secret:database/username}}
{{aws:database/username}}
# New
{{hashicorp:secret:database#username}}
{{aws:database#username}}

Additionally (Camel 4.7): the camel.vault.hashicorp.engine property and CAMEL_HASHICORP_VAULT_ENGINE environment variable were removed. Use the new hashicorp:engine:secret:… URI syntax instead — the engine is now part of the secret reference, not configured separately.

6.10 REST DSL Changes

Change	Version
`inlineRoutes` defaults to `true`	4.5
`useXForwardHeaders` defaults to `false`	4.5
Property placeholders in REST DSL now resolved eagerly at endpoint build time	4.5
Swagger 2.0 support removed, only OpenAPI v3	4.5
OpenAPI specification now generated once at startup instead of on-demand per request	4.5
REST OpenAPI Atlassian `swagger-request-validator` removed — validator no longer checks for missing JSON required nodes	4.6
Contract-first uses individual routers per endpoint	4.18

6.11 Removed Camel Components

Component	Removed In
`camel-facebook`	4.4
`camel-hdfs`	4.4
`camel-groovy-dsl`	4.9
`camel-js-dsl`	4.9
`camel-jsh-dsl`	4.9
`camel-kotlin-dsl`	4.9
`camel-etcd3`	4.11

6.12 Deprecated Camel Components

Component	Deprecated In
`camel-cloud`	4.7
`camel-univocity-parsers`	4.8
`camel-stomp`	4.17
`camel-olingo2`	4.18
`camel-olingo4`	4.18

6.13 Template / Script Component Security (4.13 — BREAKING)

Camel 4.13 introduced a security-driven default change: most language and template components no longer permit headers to drive the template/script content unless the endpoint explicitly opts in.

Change	Affected components
Header-driven templates now require `allowTemplateFromHeader=true` on the endpoint	All template components (e.g., `velocity`, `freemarker`, `mustache`, `mvel`, `string-template`, `chunk`, `jolt`, `xslt`, `xslt-saxon`)
Header-driven scripts now require `allowTemplateFromHeader=true`	Language/script components (e.g., `language`, `groovy`, `mvel`, `python`, `js`)

Customer impact: Any customer route or kamelet that relies on a header (for example CamelTemplateBody, CamelTemplateResource, CamelLanguageScript, or any custom header) to feed template/script content will silently stop processing the header and fall back to the configured static content. Routes do not throw — output is just wrong.

Customer action: Search for any ?allowTemplateFromHeader= parameters that may need adjustment, and add ?allowTemplateFromHeader=true to any endpoint URI where header-driven templates/scripts are intentional.

6.14 IM-Specific Camel Code Changes

Internal-only — customers can skip this section. These items live inside IM's own framework code (pricefx-integration module) and were applied in PFIMCORE-2862 before IM 7.3.0 shipped. They are listed here for IM framework developers validating the upgrade. No customer action required.

XmlWithNamespaceSplitter: Tokenizer API changed — TokenizeLanguage → TokenizerExpression + ExpressionReifier.
CxfPayloadProcessor: CXF payload handling changed — CxfPayload import from org.apache.camel.component.cxf.common.
New serializeCxfPayload() method for explicit DOM serialization.
RouteDeploymentError: Error message format changed — "because of Multiple consumers" → "Multiple consumers".
PfxEventConsumer: Custom exponential backoff removed — Camel 4.x has built-in backoff via ScheduledPollConsumer.
JSch/Groovy exclusions removed from camel-jsch, camel-ftp, camel-groovy — Camel 4.18 manages these internally.