It seems JDK 1.5+ is the de facto for darn near everyone...
ant compile-test with JDK 1.4 yields:
common.compile-test:
[javac] Compiling 82 source files to .../lucene/java/clean/build/
classes/test
[javac] /Users/grantingersoll/projects/lucene/java/clean/src/test/
org/apache/lucene/search/TestDocIdSet.java:85: cannot resolve symbol
[javac] symbol : method valueOf (int)
[javac] location: class java.lang.Integer
[javac] list.add(Integer.valueOf(doc));
[javac] ^
[javac].../lucene/java/clean/src/test/org/apache/lucene/search/
TestDocIdSet.java:87: cannot resolve symbol
[javac] symbol : method valueOf (int)
[javac] location: class java.lang.Integer
[javac] list.add(Integer.valueOf(doc));
[javac] ^
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -deprecation for details.
[javac] 2 errors
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