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@defaultMessage Spawns threads with vague names; use a custom thread factory (Lucene's NamedThreadFactory, Solr's DefaultSolrThreadFactory) and name threads so that you can tell (by its name) which executor it is associated with
java.util.concurrent.Executors#newFixedThreadPool(int)
java.util.concurrent.Executors#newSingleThreadExecutor()
java.util.concurrent.Executors#newCachedThreadPool()
java.util.concurrent.Executors#newSingleThreadScheduledExecutor()
java.util.concurrent.Executors#newScheduledThreadPool(int)
java.util.concurrent.Executors#defaultThreadFactory()
java.util.concurrent.Executors#privilegedThreadFactory()

@defaultMessage Properties files should be read/written with Reader/Writer, using UTF-8 charset. This allows reading older files with unicode escapes, too.
java.util.Properties#load(java.io.InputStream)
java.util.Properties#save(java.io.OutputStream,java.lang.String)
java.util.Properties#store(java.io.OutputStream,java.lang.String)

java.lang.Character#codePointBefore(char[],int) @ Implicit start offset is error-prone when the char[] is a buffer and the first chars are random chars
java.lang.Character#codePointAt(char[],int) @ Implicit end offset is error-prone when the char[] is a buffer and the last chars are random chars

java.io.File#delete() @ use Files.delete for real exception, IOUtils.deleteFilesIgnoringExceptions if you dont care

@defaultMessage Use shuffle(List, Random) instead so that it can be reproduced
java.util.Collections#shuffle(java.util.List)

@defaultMessage Construct MessageFormat(String pattern, String locale) and then use the format(String,Object...) method
java.text.MessageFormat#format(java.lang.String,java.lang.Object[])
java.text.MessageFormat#<init>(java.lang.String)