2008 November 14th Friday (十一月　十四日　金曜日)

Lu_ming

于 2008-11-28 20:39:00 发布

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文章标签： compression exception algorithm integer archive java

本文链接：https://blog.youkuaiyun.com/Lu_ming/article/details/3404833

本文描述了在使用LZMASDK for Java过程中遇到的一个内存溢出错误，并详细记录了调试过程及解决方案。作者发现压缩字典初始化大小设置过大导致Java虚拟机无法分配足够的内存空间，通过调整该值成功解决了问题。

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I found out a bug in the LZMA SDK for Java. I don't know whether the author test it. When I run it after compiled it, Java VM tell me an exception on
out of memory. I felt so strange. How much memory a compression tool needs? After debuging, I found out there is a variable _dictionarySize is initialize
with a so big number -- 2 ^ 22. My god! That is why Java can not initialize an integer array with it.

I cut half of that down. OK. The program can run correctly. I tried making a compression archive, and restored it correctly.

I can read the source of the LZMA in Java. By the way, the algorithm implemented in C++ is so hard to read.