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POjava.lang.OutOfMemoryError even though plenty of
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  1. POjava.lang.OutOfMemoryError even though plenty of
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    copied!<p>I am trying to read a 2.5GB txt file into my application. I am running Win7 x64 and have 43GB of mem available (out of 64GB). I tried playing around with -Xmx -XX:MaxParmSize -XX:ParmSize etc. None of these affect the error. What else could I try? This error seems very odd as I certainly have enough heap space available.</p> <pre><code>Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit at java.util.Arrays.copyOf(Unknown Source) at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source) at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source) at java.lang.AbstractStringBuilder.append(Unknown Source) at java.lang.StringBuilder.append(Unknown Source) at j.utilities.IO.loadString(IO.java:187) at j.utilities.IO.loadString(IO.java:169) at city.PreProcess.main(PreProcess.java:78) </code></pre> <p>I am running</p> <pre><code>java version "1.7.0_09" Java(TM) SE Runtime Environment (build 1.7.0_09-b05) Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode) </code></pre> <p>Thanks a lot in advance.</p> <p>============== ANSWER ==============</p> <p>OK, I just tested it with</p> <pre><code>StringBuilder sb = new StringBuilder(); for ( int i=1; i&lt;Integer.MAX_VALUE; i++ ) sb.append("x"); </code></pre> <p>and got</p> <pre><code>Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit at java.util.Arrays.copyOf(Unknown Source) ... </code></pre> <p>Thus, it really is StringBuilder which tries to build an array bigger than Integer.MAX_VALUE.</p> <p>In case interested</p> <pre><code>StringBuilder sb = new StringBuilder(); int i=1; try { for ( ; i&lt;Integer.MAX_VALUE; i++ ) sb.append("x"); } catch ( OutOfMemoryError e ) { System.out.println(i); // OUTPUT: 1207959551 System.out.println(Integer.MAX_VALUE); // OUTPUT: 2147483647 } </code></pre> <p>With StringBuilder you can accumulate 1,207,959,550 chars - far less than Integer.MAX_VALUE.</p>
 

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