Hi,
On Wed, Jan 13, 2010 at 1:30 AM, Manish <[email protected]> wrote:
> Thanx for ur response,
> Actually We are using string builder in our project, String Builder
> causing the memory leak in as I google, Thats the main reason i want
> to set the StringBuilder object to nil,
> We are using the htmlunit core js library for fetching the web pages
> which require the javascript enabled. The Decompiler.java using a
> variable StringBuilder result = new StringBuilder(); Netbeans
> profiler showing that this is the object consuming maximum of memory
> causing memory leak. Thats the reason only I want to set the
> StringBuilder object in our project to null. I also found on net that
> strbuilder.toString() also causing the memory leak. So in place of
> toString() we are trying to use substring(0). Like:
>
> (defn #^String element-text
> ([thing]
> (let [delimiter #s""]
> (element-text thing delimiter)
> ))
> ([thing #^String delimiter]
> (if (instance? Node thing)
> (node-text thing)
> (let [buf (StringBuilder.)]
> (doseq [#^Node e thing]
> (node-text e buf delimiter))
> (let [res (.substring buf 0)]
> (.setLength buf 0)
> res)))))
Substrings do indeed share memory with their parent strings, and this
will prevent the parents from being garbage-collected.
Try changing this:
(let [res (.substring buf 0)]
(.setLength buf 0)
res))
to:
(String. buf)
and see if your memory problem goes away. Allocating a new String
should copy the StringBuilder buffer, not sharing any storage with it,
and letting the StringBuffer storage be reclaimed.
Best,
Graham
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