PMD 6.9.0

New and noteworthy
Improved Golang CPD Support
Thanks to the work of ITBA students Matías Fraga, Tomi De Lucca and Lucas Soncini, Golang is now backed by a proper Antlr Grammar. This means CPD is now better at detecting duplicates, as comments are recognized as such and ignored.

New Rules
The new PLSQL rule CodeFormat (plsql-codestyle) verifies that PLSQL code is properly formatted. It checks e.g. for correct indentation in select statements and verifies that each parameter is defined on a separate line.

Fixed Issues
All
Exclude specific files from command line.
Could not find or load main class when using symlinked run.sh
LanguageRegistry uses default class loader when invoking ServiceLocator.
How to configure "-cache <path>"
Broken link to adding new cpd language documentation.
Apex
ClassCastException caused by Javadoc.
Java
PMD crashes with java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/xml/ws/Service
GuardLogStatement: "There is log block not surrounded by if" doesn't sound right.
UnusedImports false positive for static import with package-private method usage.
Update CommentDefaultAccessModifierRule to extend AbstractIgnoredAnnotationRule.
JUnitTestsShouldIncludeAssert false positive.
UnusedImports false positive with static ondemand import with method call.
UnnecessaryFullyQualifiedName doesn't flag same package FQCNs.
UnnecessaryModifier wrong message public->static
Processing error (ClassCastException) if a TYPE_USE annotation is used on a base class in the "extends" clause.
JspTokenManager has a problem about jsp scriptlet.
Documentation
Provide some explanation for WHY duplicate code is bad, like mutations.

API Changes
PMD has a new CLI option -ignorelist. With that, you can provide a file containing a comma-delimit list of files, that should be excluded during analysis. The ignorelist is applied after the files have been selected via -dir or -filelist, which means, if the file is in both lists, then it will be ignored. Note: there is no corresponding option for the Ant task, since the feature is already available via Ant's FileSet include/exclude filters.

External Contributions
Generalize ANTLR tokens preparing support for ANTLR token filter - Matías Fraga and Tomi De Lucca
Update cpd.md with information about risks - David M. Karr
Static Modifier on Internal Interface pmd #1356 - avishvat
Updated outdated note in the building documentation. - Maikel Steneker
Simplify check for 'Test' annotation in JUnitTestsShouldIncludeAssertRule. - Will Winder
Add missing null check AbstractJavaAnnotatableNode - Will Winder
Upgrading Apache Commons IO from 2.4 to 2.6 - Thunderforge
Upgrading Apache Commons Lang 3 from 3.7 to 3.8.1 - Thunderforge
Replacing deprecated IO methods with ones that specify a charset - Thunderforge
Improved message for GuardLogStatement rule - Felix Lampe
Add CPD support for Antlr based grammar on Golang - Matías Fraga
Upgrading SLF4J from 1.7.12 to 1.7.25 - Thunderforge
Fix Issue 1343: Update CommentDefaultAccessModifierRule - CrazyUnderdog
Replacing IOUtils.closeQuietly(foo) with try-with-resources statements - Thunderforge
Fix issue 1402: JspTokenManager has a problem about jsp scriptlet - JustPRV
Add ignore file path functionality - Jon Moroney
Fix broken link - Johan Hammar