飛碟（xhtmlrenderer）內存不足

Question

我試圖用飛碟創建一個非常大的PDF，它似乎內存不足。

下面是一些堆棧痕跡，這表明飛碟並不是完全可擴展的......或者我做錯了什麼？

java.lang.OutOfMemoryError: Java heap space 
     at com.sun.org.apache.xerces.internal.util.XMLStringBuffer.append(XMLStringBuffer.java:205) 
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.refresh(XMLDocumentScannerImpl.java:1520) 
     at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.invokeListeners(XMLEntityScanner.java:2070) 
     at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.scanLiteral(XMLEntityScanner.java:1063) 
     at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanAttributeValue(XMLScanner.java:974) 
     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanAttribute(XMLNSDocumentScannerImpl.java:460) 
     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:277) 
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747) 
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) 
     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) 
     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) 
     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) 
     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) 
     at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) 
     at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) 
     at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:637) 
     at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:708) 
     at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:313) 
     at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:189) 
     at org.xhtmlrenderer.resource.XMLResource.load(XMLResource.java:71) 

java.lang.OutOfMemoryError: Java heap space 
    at java.util.Arrays.copyOf(Arrays.java:2882) 
    at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100) 
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:597) 
    at java.lang.StringBuffer.append(StringBuffer.java:329) 
    at org.xhtmlrenderer.css.newmatch.Matcher$Mapper.mapChild(Matcher.java:385) 
    at org.xhtmlrenderer.css.newmatch.Matcher.matchElement(Matcher.java:153) 
    at org.xhtmlrenderer.css.newmatch.Matcher.getMapper(Matcher.java:235) 
    at org.xhtmlrenderer.css.newmatch.Matcher.getCascadedStyle(Matcher.java:85) 
    at org.xhtmlrenderer.context.StyleReference.getCascadedStyle(StyleReference.java:199) 
    at org.xhtmlrenderer.layout.SharedContext.getStyle(SharedContext.java:548) 
    at org.xhtmlrenderer.layout.SharedContext.getStyle(SharedContext.java:527) 
    at org.xhtmlrenderer.layout.BoxBuilder.createChildren(BoxBuilder.java:1069) 
    at org.xhtmlrenderer.layout.BoxBuilder.createChildren(BoxBuilder.java:113) 
    at org.xhtmlrenderer.render.BlockBox.ensureChildren(BlockBox.java:902) 
    at org.xhtmlrenderer.layout.BoxBuilder.createChildren(BoxBuilder.java:1115) 
    at org.xhtmlrenderer.layout.BoxBuilder.createChildren(BoxBuilder.java:113) 
    at org.xhtmlrenderer.render.BlockBox.ensureChildren(BlockBox.java:902) 
    at org.xhtmlrenderer.layout.BoxBuilder.createChildren(BoxBuilder.java:1135) 

Answer 1

您可能只需要增加堆大小;例如嘗試將-Xmx256m添加到用於啓動應用程序的java命令中。

根據你的推論，你可能也認爲飛碟不是完全可擴展的。我期望它創建並使用完整輸入XML和完整目標PDF文件的內存表示。 （這樣做最容易。）

但是，「一個非常大的」PDF文件不可擴展，因爲它可能會導致下載和查看它的人的問題。所以也許你應該看看生成多個PDF文件。