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Thread: Facing OutOfMemoryError Java Heap Space error

  1. #1
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    Default Facing OutOfMemoryError Java Heap Space error

    All,

    I am not a java developer, but I am using a java code that was available online to convert a large XML file to CSV file. The input file size is big, it is around 3GB. I got an error that it is out of memory, it is expectedly due to the large input file that i am trying to convert. Splitting of this file is not possible, could you suggest any options to work around this problem?

    This is what I ran:
    xml2csv-conv data.xml data.csv

    Error:
    Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createChu
    nk(Unknown Source)
    at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.ensureCap
    acity(Unknown Source)
    at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createNod
    e(Unknown Source)
    at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createDef
    erredTextNode(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.Abstrac tDOMParser.characte
    rs(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumen tFragmentScannerImp
    l.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(U
    nknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(U
    nknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLPars er.parse(Unknown So
    urce)
    at com.sun.org.apache.xerces.internal.parsers.DOMPars er.parse(Unknown So
    urce)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBu ilderImpl.parse(Unk
    nown Source)
    at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
    at xml2csvconv.Main.convert(Main.java:194)
    at xml2csvconv.Main.main(Main.java:493)

    Thanks a ton!

    --- Update ---

    Additional information: I am running this from a Windows8 64 bit machine with 8GB physical RAM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Facing OutOfMemoryError Java Heap Space error

    The java command has commandline options for setting the memory sizes it uses. Try using one or more of them.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Facing OutOfMemoryError Java Heap Space error

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    While splitting your input file may not be possible (feasible, desirable, whatever), how you handle the file in your program is completely under your control. Designing your program to completely (or nearly) fill the client computer's memory with data is neither good practice nor reasonable, and it increases its vulnerability to being hacked. Design your program to process the data in manageable chunks by storing the data in data structures or data bases that give you the flexibility and tools needed to access and use the data as required.

  4. #4
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    Default Re: Facing OutOfMemoryError Java Heap Space error

    All, Thanks for your quick responses. I will go through your comments and try them. Will keep you posted

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