Class 'java.util.List' cannot be instantiated...

[Lennart Jörelid <le...@gmail.com>]

After a few hiccups, all ITs for Maven3 now execute well on the
jaxb2-maven-plugin.
However, one of the ITs is run by Maven2 on JDK 1.6, and the integration
tests there expose the exception shown in the snippet below.

I would suspect that the error is created by parameters like the two below:

@Parameter(required = false)
private List<String> sources;

or

@Parameter(defaultValue = "${project.compileSourceRoots}", readonly = true,
required = true)
private List<String> sources;

What would be the best approach to getting rid of these exceptions? Using
an Array instead of List as parameter? Something else?

Cause: Class 'java.util.List' cannot be instantiated
[INFO] ------------------------------------------------------------------------
[DEBUG] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error
configuring: org.codehaus.mojo:jaxb2-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.codehaus.mojo:jaxb2-maven-plugin. Reason: Unable to
parse the created DOM for plugin configuration
	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:
Class 'java.util.List' cannot be instantiated
	at org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter.instantiateObject(AbstractConfigurationConverter.java:121)
	at org.codehaus.plexus.component.configurator.converters.composite.CollectionConverter.fromConfiguration(CollectionConverter.java:73)
	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)
	at org.apache.maven.plugin.DefaultPluginManager.populatePluginFields(DefaultPluginManager.java:1357)
	... 20 more*Caused by: java.lang.InstantiationException: java.util.List*
	at java.lang.Class.newInstance0(Class.java:340)
	at java.lang.Class.newInstance(Class.java:308)
	at org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter.instantiateObject(AbstractConfigurationConverter.java:111)
	... 25 more



-- 

--
+==============================+
| Bästa hälsningar,
| [sw. "Best regards"]
|
| Lennart Jörelid
| EAI Architect & Integrator
|
| jGuru Europe AB
| Mölnlycke - Kista
|
| Email: lj@jguru.se
| URL:   www.jguru.se
| Phone
| (skype):    jgurueurope
| (intl):     +46 708 507 603
| (domestic): 0708 - 507 603
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