Memory leak in Batik 1.0 JPEG-Transcoder ?
We're working on an application that generates charts on the fly.
The application generates an svg document and uses the batik transcoder api
to transcode it into a jpeg (Batik 1.0 final). We noticed that after a
certain amout of requests the application is stopping with an
OutOfMemoryError.
We used JProbe to analyze where the memory leak comes from. We suspected
it came from the jpeg transcoder. To make sure we wrote a simple test
class that does nothing else but transcode one svg document again and
again and again. The code is below.
(Ok, the code is not really beatiful but that should't consume memory ;-) )
The used svg document is not very complex and about 15KByte in size. See
below.
After about the 115th transcoding the JVM memory (64MByte) is used up and
the OutOfMemoryError Exception occurs. According to JProbe most of the
memory is used by int[]. Unfortunately JProbe is unable to tell _where_
exactly all the int[] are allocated.
Regards,
Markus Huehn
<---- code sniplet --
public class ChartTransformer extends java.lang.Object {
public ChartTransformer() {
}
byte[] getDocument(String pURL) {
StringBuffer sb=new StringBuffer();
int b;
InputStream fis;
try {
fis = new java.io.FileInputStream("D:\\temp\\test_svg.xml");
b=fis.read();
while(b!=-1) {
sb.append((char)b);
b=fis.read();
}
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
return sb.toString().getBytes();
}
void transcode(OutputStream pOs, String pURL, float pJpegQuality) {
byte[] svgChart = getDocument(pURL);
try {
Float myJpegQuality = new Float(pJpegQuality);
org.apache.batik.transcoder.TranscoderInput input = new
org.apache.batik.transcoder.TranscoderInput(new ByteArrayInputStream
(svgChart));
org.apache.batik.transcoder.TranscoderOutput output = new
org.apache.batik.transcoder.TranscoderOutput(pOs);
org.apache.batik.transcoder.image.JPEGTranscoder
jpegTranscoder = new org.apache.batik.transcoder.image.JPEGTranscoder();
jpegTranscoder.addTranscodingHint
(org.apache.batik.transcoder.image.JPEGTranscoder.KEY_QUALITY,
myJpegQuality);
jpegTranscoder.addTranscodingHint
(org.apache.batik.transcoder.image.JPEGTranscoder.KEY_XML_PARSER_CLASSNAME,
"org.apache.crimson.parser.XMLReaderImpl");
jpegTranscoder.transcode(input, output);
myJpegQuality = null;
input = null;
svgChart = null;
output = null;
jpegTranscoder = null;
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(java.lang.String[] args) {
for(int i=0;i<300;i++){
try{
ChartTransformer ct = new ChartTransformer();
java.io.FileOutputStream fos = new java.io.FileOutputStream
("D:\\temp\\pic.jpg");
ct.transcode((java.io.OutputStream)fos,"test_svg.xml",
(float)0.5);
fos.close();
ct = null;
}
catch(Exception e){
e.printStackTrace();
}
}
System.exit(0);
}
}
---- end code sniplet -->
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