Basic groovy example generates "Ambiguous method overloading for method org.apache.camel.model.RouteDefinition#process"

[jcordes73]

When using Camel K Client 1.0.0-M4 the Groovy example (from https://camel.apache.org/camel-k/latest/languages/groovy.html)

from('timer:tick')
.process { it.in.body = 'Hello Camel K!' }
.to('log:info')

leads to the following error in the pod:

Starting the Java application using /opt/run-java/run-java.sh ...
exec java -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:+ExitOnOutOfMemoryError -cp ./resources:/etc/camel/conf:/etc/camel/resources:/etc/camel/sources/i-source-000:dependencies/com.sun.xml.bind.jaxb-core-2.3.0.1.jar:dependencies/com.sun.xml.bind.jaxb-impl-2.3.0.jar:dependencies/commons-io.commons-io-2.6.jar:dependencies/javax.xml.bind.jaxb-api-2.3.0.jar:dependencies/org.apache.camel.camel-api-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-base-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-core-engine-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-endpointdsl-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-groovy-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-jaxp-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-log-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-main-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-management-api-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-support-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-timer-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-util-3.0.0-RC3.jar:dependencies/org.apache.camel.camel-util-json-3.0.0-RC3.jar:dependencies/org.apache.camel.k.camel-k-loader-groovy-1.0.7.jar:dependencies/org.apache.camel.k.camel-k-runtime-core-1.0.7.jar:dependencies/org.apache.camel.k.camel-k-runtime-main-1.0.7.jar:dependencies/org.apache.camel.spi-annotations-3.0.0-RC3.jar:dependencies/org.apache.commons.commons-lang3-3.9.jar:dependencies/org.apache.logging.log4j.log4j-api-2.12.1.jar:dependencies/org.apache.logging.log4j.log4j-core-2.12.1.jar:dependencies/org.apache.logging.log4j.log4j-slf4j-impl-2.12.1.jar:dependencies/org.codehaus.groovy.groovy-2.5.8.jar:dependencies/org.slf4j.slf4j-api-1.7.28.jar org.apache.camel.k.main.Application
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
2019-12-13 21:21:57.103 �[32mINFO �[m [main] ApplicationRuntime - Add listener: org.apache.camel.k.listener.ContextConfigurer@4e91d63f
2019-12-13 21:21:57.107 �[32mINFO �[m [main] ApplicationRuntime - Add listener: org.apache.camel.k.listener.RoutesConfigurer@5e316c74
2019-12-13 21:21:57.107 �[32mINFO �[m [main] ApplicationRuntime - Add listener: org.apache.camel.k.listener.RoutesDumper@161479c6
2019-12-13 21:21:57.121 �[32mINFO �[m [main] RuntimeSupport - Looking up loader for language: groovy
2019-12-13 21:21:57.333 �[32mINFO �[m [main] RuntimeSupport - Found loader org.apache.camel.k.loader.groovy.GroovyRoutesLoader@37313c65 for language groovy from service definition
2019-12-13 21:21:57.603 �[32mINFO �[m [main] RoutesConfigurer - Loading routes from: file:/etc/camel/sources/i-source-000/integration.groovy?language=groovy
2019-12-13 21:21:57.603 �[32mINFO �[m [main] ApplicationRuntime - Listener org.apache.camel.k.listener.RoutesConfigurer@5e316c74 executed in phase ConfigureRoutes
2019-12-13 21:21:57.613 �[32mINFO �[m [main] BaseMainSupport - Using properties from: file:/etc/camel/conf/application.properties
Exception in thread "main" groovy.lang.GroovyRuntimeException: Ambiguous method overloading for method org.apache.camel.model.RouteDefinition#process.
Cannot resolve which method to invoke for [class Script1$_run_closure1] due to overlapping prototypes between:
[interface java.util.function.Supplier]
[interface org.apache.camel.Processor]
at groovy.lang.MetaClassImpl.doChooseMostSpecificParams(MetaClassImpl.java:3279)
at groovy.lang.MetaClassImpl.chooseMostSpecificParams(MetaClassImpl.java:3256)
at groovy.lang.MetaClassImpl.chooseMethodInternal(MetaClassImpl.java:3245)
at groovy.lang.MetaClassImpl.chooseMethod(MetaClassImpl.java:3188)
at groovy.lang.MetaClassImpl.getMethodWithCachingInternal(MetaClassImpl.java:1355)
at groovy.lang.MetaClassImpl.createPojoCallSite(MetaClassImpl.java:3434)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createPojoSite(CallSiteArray.java:131)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallSite(CallSiteArray.java:165)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127)
at Script1.run(Script1.groovy:1)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234)
at org.apache.camel.k.loader.groovy.GroovyRoutesLoader$1$_configure_closure1.doCall(GroovyRoutesLoader.groovy:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:101)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:263)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
at groovy.lang.Closure.call(Closure.java:405)
at groovy.lang.Closure.call(Closure.java:421)
at org.codehaus.groovy.runtime.IOGroovyMethods.withCloseable(IOGroovyMethods.java:1608)
at org.codehaus.groovy.runtime.dgm$913.doMethodInvoke(Unknown Source)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234)
at org.apache.camel.k.loader.groovy.GroovyRoutesLoader$1.configure(GroovyRoutesLoader.groovy:51)
at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:471)
at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:438)
at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:418)
at org.apache.camel.impl.engine.AbstractCamelContext.lambda$addRoutes$0(AbstractCamelContext.java:1114)
at org.apache.camel.impl.engine.AbstractCamelContext.doWithDefinedClassLoader(AbstractCamelContext.java:2455)
at org.apache.camel.impl.engine.AbstractCamelContext.addRoutes(AbstractCamelContext.java:1114)
at org.apache.camel.main.RoutesConfigurer.configureRoutes(RoutesConfigurer.java:84)
at org.apache.camel.main.BaseMainSupport.postProcessCamelContext(BaseMainSupport.java:549)
at org.apache.camel.main.BaseMainSupport.initCamelContext(BaseMainSupport.java:402)
at org.apache.camel.k.main.ApplicationRuntime$MainAdapter.doInit(ApplicationRuntime.java:168)
at org.apache.camel.support.service.ServiceSupport.init(ServiceSupport.java:62)
at org.apache.camel.support.service.ServiceSupport.start(ServiceSupport.java:90)
at org.apache.camel.main.MainSupport.run(MainSupport.java:77)
at org.apache.camel.k.main.ApplicationRuntime.run(ApplicationRuntime.java:70)
at org.apache.camel.k.main.Application.main(Application.java:42)

[nicolaferraro]

Thanks @jcordes73 for opening these issues, these examples used to work but there has been some breaking change in Camel that cause them to fail.

I've opened https://issues.apache.org/jira/browse/CAMEL-14300 to fix it in one of next Camel version. In the meantime we should find some workaround for this and #1144.

cc: @lburgazzoli

[lburgazzoli]

Till we get it fixed, you can workaround it by coercing the closure to the type

.process { it.in.body = 'Hello Camel K!' } as Processor

[lburgazzoli]

fixed now