License check breaks if file has no package declaration

I got the following exception:

Step 'licenseHeader' found problem in 'src/main/java/me/banes/chris/tivi/extensions/PreferenceExtensions.kt':
Unable to find delimiter regex ^package 
java.lang.IllegalArgumentException: Unable to find delimiter regex ^package 
        at com.diffplug.spotless.generic.LicenseHeaderStep.format(LicenseHeaderStep.java:88)
        at com.diffplug.spotless.FormatterStepImpl$Standard.format(FormatterStepImpl.java:78)
        at com.diffplug.spotless.FormatterStep$Strict.format(FormatterStep.java:76)
        at com.diffplug.spotless.Formatter.compute(Formatter.java:230)
        at com.diffplug.spotless.Formatter.isClean(Formatter.java:167)
        at com.diffplug.gradle.spotless.SpotlessTask.check(SpotlessTask.java:216)
        at com.diffplug.gradle.spotless.SpotlessTask.performAction(SpotlessTask.java:172)
        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.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)

[jbduncan]

We do provide a way to specify the start of the file manually.

Oops, I missed that. Thanks for correcting me @nedtwigg. 😜

[nedtwigg]

We do provide a way to specify the start of the file manually. The easiest workaround is to avoid the default package. If you don’t want to change that, then you have to provide the regex yourself, e.g. something like licenseHeaderFile('license.txt', '^(package|//startfile)') if you want to use the //startfile comment to signify the start of the file. Without a package declaration, it’s very difficult to find a regex that will work in the general case. Files might start with imports, comments, a class declaration, etc.