XML DSL - Validate <route> has a <from> on startup
--------------------------------------------------
Key: CAMEL-4077
URL: https://issues.apache.org/jira/browse/CAMEL-4077
Project: Camel
Issue Type: Improvement
Components: camel-core
Affects Versions: 2.7.2
Reporter: Claus Ibsen
Priority: Minor
Fix For: 2.8.0
We should add validation that a <route> has a <from> as input source. If there
is no such, you may get a stacktrace about no such element.
{code:xml}
<route>
<to uri="log:line"/>
<process ref="myProcessor"/>
<to uri="mock:line"/>
</route>
{code}
{code}
Caused by: java.util.NoSuchElementException
at java.util.AbstractList$Itr.next(AbstractList.java:350)
at
org.apache.camel.impl.DefaultCamelContext.doStartOrResumeRoutes(DefaultCamelContext.java:1524)
at
org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:1436)
at
org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:1326)
at
org.apache.camel.spring.SpringCamelContext.doStart(SpringCamelContext.java:164)
at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:67)
at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:54)
at
org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:1304)
at
org.apache.camel.spring.SpringCamelContext.maybeStart(SpringCamelContext.java:208)
at
org.apache.camel.spring.SpringCamelContext.onApplicationEvent(SpringCamelContext.java:101)
... 29 more
{code}
The validation should be in camel-core so we ensure this is checked regardless
how the route definition has been created.
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