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nio2: NIO.2 file API companion code (streaming 5 GB at -Xmx64m, handle leaks, WatchService, mmap)

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
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asmhatre
2026-09-30 19:14:31 +00:00
co-authored by Claude Sonnet 5.5
parent f4b732799d
commit 1ac2f6077a
30 changed files with 1072 additions and 0 deletions
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nio2/output/05-read-all-fail.txt
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$ java -Xmx64m ReadAllFail readAllLines medium.log
OutOfMemoryError: Java heap space
$ java -Xmx64m ReadAllFail readString medium.log
OutOfMemoryError: Java heap space
$ java -Xmx64m ReadAllFail readAllBytes medium.log
OutOfMemoryError: Java heap space
$ java -Xmx64m ReadAllFail readAllLines big.log
OutOfMemoryError: Java heap space
$ java -Xmx64m ReadAllFail readString big.log
OutOfMemoryError: Required array size too large
$ java -Xmx64m ReadAllFail readAllBytes big.log
OutOfMemoryError: Required array size too large
How much heap does the 200 MB file need? (readAllLines, then readString)
readAllLines -Xmx256m OutOfMemoryError: Java heap space
readString -Xmx256m survived: 200000016 chars
readAllLines -Xmx512m survived: 1378768 lines
readString -Xmx512m survived: 200000016 chars
readAllLines -Xmx1g survived: 1378768 lines
readString -Xmx1g survived: 200000016 chars
readAllLines -Xmx2g survived: 1378768 lines
readString -Xmx2g survived: 200000016 chars