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POOutofMemoryError when reading large files
 

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  1. POOutofMemoryError when reading large files
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    <p>I am trying to read several big files(over 100MB). And by so far it always cracks down in the middle with the OutofMemory Error. Is there any solutions to it?</p> <pre><code> FileInputStream fstream = new FileInputStream(f); // Get the object of DataInputStream DataInputStream dain = new DataInputStream(fstream); // BufferedReader br = new BufferedReader(new InputStreamReader(in)); BufferedReader in = new BufferedReader(new InputStreamReader(dain)); String text = in.readLine(); while(text != null) { stat(text); text = in.readLine(); } </code></pre> <p>The Exception is like this:</p> <pre><code> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOfRange(Arrays.java:2694) at java.lang.String.&lt;init&gt;(String.java:234) at java.io.BufferedReader.readLine(BufferedReader.java:349) at java.io.BufferedReader.readLine(BufferedReader.java:382) </code></pre> <p>Here is what Stat does:</p> <pre><code> public void stat(String text) { String postTypeId = this.getXmlValue(text, "PostTypeId"); String viewCountStr = this.getXmlValue(text, "ViewCount"); String answerCountStr = this.getXmlValue(text, "AnswerCount"); String userId = this.getXmlValue(text, "OwnerUserId"); String postId = this.getXmlValue(text, "Id"); String parentId = this.getXmlValue(text, "ParentId"); String backUpId = this.getXmlValue(text, "LastEditorUserId"); //Add post rel if(parentId==null) { if(!postTable.containsKey(postId)) postTable.put(postId, new PostRel()); } else { try{ postTable.get(parentId).addAnswer(postId); }catch(Exception exp) { } } generalCount(postTypeId,viewCountStr,answerCountStr,userId,postId,parentId,backUpId); </code></pre> <p>}</p> <p>And In generalCount, I tried to insert another table:</p> <pre><code> if(userTable.containsKey(userId)) { userTable.get(userId).addPost(postId); if(parentId!=null) userTable.get(userId).addAnswer(parentId); } else{ UserPostInfo newInfo = new UserPostInfo(); newInfo.addPost(postId); if(parentId!=null) newInfo.addAnswer(parentId); userTable.put(userId, newInfo); </code></pre>
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    1. COIs it possible that the file contains huge lines? That's *likely* if the file is not actually a text file. Also: are you holding onto any data inside the `stat` method?
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      1. USJoachim Sauer
    2. COWhat does the `stat()` method do?
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      1. USMatt Ball
    3. COPlease don't use DataInputStream to read text. Unfortunately examples like this get copied again and again so can you can remove it from your example. http://vanillajava.blogspot.co.uk/2012/08/java-memes-which-refuse-to-die.html
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      1. USPeter Lawrey
 

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