I've encountered an ArrayIndexOutOfBounds in 2.2.10 when using Session.importXML of larger documents. It appears that buffer size calculation is wrong. That error should be exist also in trunk and 2.4.0.
The problem seems to occur when the string to append exceeds the existing buffer by more than BUFFER_INCREMENT characters as the buffer is only incremented by BUFFER_INCREMENT chars no matter how big the string to append really is. Afaik, the length of the destination buffer needs to be at least bufferPos (existing content) + length (as passed in). In my example is saw 15854 (bufferPos) and 16384 (length param to append()) requiring at least 15854+ 16384=32238 bytes. In that case the existing buffer was 16384 and the new buffer is 16384+BUFFER_INCREMENT=16384+8192 = 24576. 32238 > 24576 => ArrayIndexOutOfBounds exception. Fix: I think the resizing of the buffer should observe the length. Today: new size = old size + BUFFER_INCREMENT New: new size = bufferPos + length and if one would like to avoid future copies on small appends even new size = bufferPos + length + BUFFER_INCREMENT So instead of char[] newBuffer = new char[buffer.length + BUFFER_INCREMENT]; I changed it to char[] newBuffer = new char[ bufferPos +length + BUFFER_INCREMENT]; This is line 326 of jackrabbit-jcr2spi: org/apache/jackrabbit/jcr2spi/xml/TargetImportHandler.java I've created a bug for this as https://issues.apache.org/jira/browse/JCR-3235 If BuffferedStringValue wouldn't be inner, I would even create a test case for this ;-) For completeness this is the stack trace: java.lang.ArrayIndexOutOfBoundsException: null at java.lang.System.arraycopy(Native Method) ~[na:1.7.0_04-ea] at org.apache.jackrabbit.jcr2spi.xml.TargetImportHandler$BufferedStringValue.append(TargetImportHandler.java:330) ~[jackrabbit-jcr2spi-2.2.10.jar:na] at org.apache.jackrabbit.jcr2spi.xml.SysViewImportHandler.characters(SysViewImportHandler.java:204) ~[jackrabbit-jcr2spi-2.2.10.jar:na] at org.apache.jackrabbit.jcr2spi.xml.ImportHandler.characters(ImportHandler.java:262) ~[jackrabbit-jcr2spi-2.2.10.jar:na] at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.characters(AbstractSAXParser.java:543) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:441) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568) ~[na:1.7.0_04-ea] at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:302) ~[na:1.7.0_04-ea] at org.apache.jackrabbit.jcr2spi.SessionImpl.importXML(SessionImpl.java:400) ~[jackrabbit-jcr2spi-2.2.10.jar:na] --I
