Found in titles:

1. DMelt: weka.core.stopwords.Null [100%] (Java API)
2. DMelt: org.apache.commons.lang3.ObjectUtils.Null [75%] (Java API)
3. DMelt: weka.classifiers.evaluation.output.prediction.Null [75%] (Java API)
4. DataMelt API: org.apache.bcel.generic.ACONST_NULL [100%] (Java API)
5. DataMelt API: org.tmatesoft.sqljet.core.internal.lang.SqlParser.column_constraint_not_null_return [80%] (Java API)
6. DataMelt API: org.tmatesoft.sqljet.core.internal.lang.SqlParser.column_constraint_null_return [80%] (Java API)
7. Groovy: documentation.design-pattern-null-object [80%] (Groovy API)