Maven 2.2.1: How to convert an enum in a complex configuration element?

[Mirko Friedenhagen <mf...@gmail.com>]

Hello,

the jacoco-maven-plugin 0.6.3 introduced a complex type with an enum
field as configuration element[0] This works fine with Maven 3.X
however with Maven 2.2.1 this fails badly[1]. Using an implementation
hint did help for the uppermost configuration element itself, however
the field "element" which is an enum may not be converted.

As we want to maintain 2.2.1 compatibility urging the users to Maven
3.X is not really an option :-)

The used plexus-container-default-1.0* does not include an
EnumConverter so we see the stack trace below.

- Is there any way to enforce a newer plexus-container-default during
the build/parsing of the pom/DOM generation?

- Does anyone know of a workaround?

--- snip ---
[INFO] Failed to configure plugin parameters for:
org.jacoco:jacoco-maven-plugin:0.6.4-SNAPSHOT

    (found static expression: 'CLASS' which may act as a default value).


Cause: Cannot assign configuration entry 'element' to 'class
org.jacoco.core.analysis.ICoverageNode$ElementType' from 'CLASS',
which is of type class java.lang.String
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error
configuring: org.jacoco:jacoco-maven-plugin. Reason: Unable to parse
the created DOM for plugin configuration
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:723)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.PluginConfigurationException: Error
configuring: org.jacoco:jacoco-maven-plugin. Reason: Unable to parse
the created DOM for plugin configuratio
n
        at org.apache.maven.plugin.DefaultPluginManager.populatePluginFields(DefaultPluginManager.java:1363)
        at org.apache.maven.plugin.DefaultPluginManager.getConfiguredMojo(DefaultPluginManager.java:724)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:468)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        ... 17 more
Caused by: org.codehaus.plexus.component.configurator.ComponentConfigurationException:
Cannot assign configuration entry 'element' to 'class
org.jacoco.core.analysis.ICoverageNode
$ElementType' from 'CLASS', which is of type class java.lang.String
        at org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter.fromExpression(AbstractConfigurationConverter.java:149)
        at org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter.fromConfiguration(ObjectWithFieldsConverter.java:80)
        at org.codehaus.plexus.component.configurator.converters.ComponentValueSetter.configure(ComponentValueSetter.java:207)
        at org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter.processConfiguration(ObjectWithFieldsConverter.java:137)
        at org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter.fromConfiguration(ObjectWithFieldsConverter.java:90)
        at org.codehaus.plexus.component.configurator.converters.composite.CollectionConverter.fromConfiguration(CollectionConverter.java:177)
        at org.codehaus.plexus.component.configurator.converters.ComponentValueSetter.configure(ComponentValueSetter.java:247)
        at org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter.processConfiguration(ObjectWithFieldsConverter.java:137)
        at org.codehaus.plexus.component.configurator.BasicComponentConfigurator.configureComponent(BasicComponentConfigurator.java:56)
--- snap ---

Thanks and best regards Mirko

[0] https://github.com/jacoco/jacoco/blob/master/jacoco-maven-plugin/src/org/jacoco/maven/CheckMojo.java#L112

[1] https://github.com/jacoco/jacoco/pull/129

-- 
http://illegalstateexception.blogspot.com/
https://github.com/mfriedenhagen/ (http://osrc.dfm.io/mfriedenhagen)
https://bitbucket.org/mfriedenhagen/

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