Kwalitee Issues


Take a look at the META.yml Spec at (for version 1.4) or (for version 2), and change your META.yml accordingly.

Error: Expected a list structure (author) [Validation: 1.3];License '<undef>' is invalid (license) [Validation: 1.3];Missing mandatory field, 'abstract' (abstract) [Validation: 1.3];Missing mandatory field, 'author' (author) [Validation: 1.3];Missing mandatory field, 'license' (license) [Validation: 1.3];value is an undefined string (abstract) [Validation: 1.3]


Add 'use strict' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules are strictly written.

Error: Java::JVM::Classfile::Ops


Split the distribution, or fix the version numbers to make them consistent (use the highest version number to avoid version downgrade).

Error: 0.16,0.20


Add a META.json to the distribution. Your buildtool should be able to autogenerate it.


If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.


Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.


Ask the owner of the distribution (the one who released it first, or the one who is designated in x_authority) to give you a (co-)maintainer's permission.


  • java::lang::String


Add 'use warnings' (or its equivalents) to all modules (this will require perl > 5.6), or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: Java::JVM::Classfile, Java::JVM::Classfile::Ops, Java::JVM::Classfile::Perl


This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.


Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.


Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).


Name Abstract Version View
Java::JVM::Classfile Parse JVM Classfiles 0.20 metacpan
Java::JVM::Classfile::Ops metacpan
Java::JVM::Classfile::Perl 0.16 metacpan


Name File View
Java::JVM::Classfile::Attribute lib/Java/JVM/ metacpan
Java::JVM::Classfile::Attribute::Code lib/Java/JVM/ metacpan
Java::JVM::Classfile::ConstantPoolEntry lib/Java/JVM/ metacpan
Java::JVM::Classfile::Exception lib/Java/JVM/ metacpan
Java::JVM::Classfile::Field lib/Java/JVM/ metacpan
Java::JVM::Classfile::Instruction lib/Java/JVM/ metacpan
Java::JVM::Classfile::LineNumber lib/Java/JVM/ metacpan
Java::JVM::Classfile::LocalVariable lib/Java/JVM/ metacpan
Java::JVM::Classfile::LocalVariableType lib/Java/JVM/ metacpan
Java::JVM::Classfile::Method lib/Java/JVM/ metacpan
Java::JVM::Classfile::Struct lib/Java/JVM/ metacpan
java::io::PrintStream lib/Java/JVM/Classfile/ metacpan
java::lang::Integer lib/Java/JVM/Classfile/ metacpan
java::lang::String lib/Java/JVM/Classfile/ metacpan
java::lang::StringBuffer lib/Java/JVM/Classfile/ metacpan
java::lang::System lib/Java/JVM/Classfile/ metacpan

Other Files

MANIFEST metacpan
META.yml metacpan
Makefile.PL metacpan
README metacpan