LicenseBasePlugin seems to break Configuration Cache

[jonatan-ivanov]

We are using gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.16.1 (latest) and it seems the LicenseBasePlugin breaks the Gradle Configuration Cache.

Adding the plugin to a project and execute a task with --configuration-cache (e.g.: gradle clean --configuration-cache) results in this issue:

Plugin class 'com.hierynomus.gradle.license.LicenseBasePlugin': read system property 'file.encoding'
  See https://docs.gradle.org/7.1.1/userguide/configuration_cache.html#config_cache:requirements:undeclared_sys_prop_read

Where the linked docs page gives more details.

Also, if you open the generated report, it has the stacktrace (I truncated it):

org.gradle.api.InvalidUserCodeException: Read system property 'file.encoding'
	at org.gradle.configurationcache.SystemPropertyAccessListener.systemPropertyQueried(SystemPropertyAccessListener.kt:92)
	at org.gradle.internal.classpath.Instrumented$DecoratingProperties.getProperty(Instrumented.java:313)
	at org.gradle.internal.classpath.Instrumented$DecoratingProperties.getProperty(Instrumented.java:307)
	at org.gradle.internal.classpath.Instrumented$DecoratingProperties.get(Instrumented.java:327)
	at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:1884)
	at groovy.lang.MetaClassImpl.getProperty(MetaClassImpl.java:3870)
	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:199)
	at org.codehaus.groovy.runtime.DefaultGroovyMethods.getAt(DefaultGroovyMethods.java:407)
	at org.codehaus.groovy.runtime.dgm$305.invoke(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:247)
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:139)
	at com.hierynomus.gradle.license.LicenseBasePlugin$_createExtension_closure2.doCall(LicenseBasePlugin.groovy:80)
...