Hi,
Firstly, thanks for all the answers to my previous questions on this list.
I have been able to use the transcoder to generate JPEGs from SVG on the fly
in a webserver, and my boss is quite pleased :-) Special thanks to Batik
dev team for a wonderful product.
I observe that some thread (s) do not finish after the transcoding is done.
Is this a bug? Or should I be doing some cleanup/setting after transcoding?
I suspect that this lingering thread (s) is causing my web server to freeze
up after several transcoding requests. I instantiate a single
JPEGTranscoder object to serve all requests, and when a request comes in, I
simply send in suitable new input and output streams to the transcoder. The
first few times (10 or 20), it works fine, after that the images fail to
download, and then the web server (JRun) freezes up completely.
I have a simple, straightforward Java program below, that converts an SVG
string to a JPEG file. When I run it from the command line, it does
terminate after printing "DONE". Why? I have generated a stack trace
(below), but am not experienced enough to interpret it.
As always, thanks in advance for any suggestions.
--Diwakar
================== Stack Trace ========================
SIGQUIT
Full thread dump Classic VM (JDK-1.2.2_006, green threads):
"Thread-1" (TID:0xebc735e0, sys_thread_t:0x79e358, state:CW) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at org.apache.batik.ext.awt.image.rendered.TileMap$1.run(TileMap.java,
Compiled Code)
"Thread-0" (TID:0xebc9e808, sys_thread_t:0x5f7150, state:CW) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at org.apache.batik.util.SoftReferenceCache$1.run(SoftReferenceCache.java,
Compiled Code)
"AWT-Motif" (TID:0xebcc17d8, sys_thread_t:0x4bd258, state:CW) prio=5
at sun.awt.motif.MToolkit.run(Native Method)
at java.lang.Thread.run(Thread.java, Compiled Code)
"SunToolkit.PostEventQueue-0" (TID:0xebcc2288, sys_thread_t:0x49b728,
state:CW) prio=5
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java, Compiled Code)
at sun.awt.PostEventQueue.run(SunToolkit.java, Compiled Code)
"AWT-EventQueue-0" (TID:0xebcc2600, sys_thread_t:0x49ad10, state:CW)
prio=6
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java, Compiled Code)
at java.awt.EventQueue.getNextEvent(EventQueue.java, Compiled Code)
at
java.awt.EventDispatchThread.pumpOneEventForComponent(EventDispatchThread.ja
va, Compiled Code)
at
java.awt.EventDispatchThread.pumpEventsForComponent(EventDispatchThread.java
, Compiled Code)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java,
Compiled Code)
at java.awt.EventDispatchThread.run(EventDispatchThread.java, Compiled
Code)
"Finalizer" (TID:0xebc98320, sys_thread_t:0x6d060, state:CW) prio=8
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java, Compiled Code)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:174)
"Reference Handler" (TID:0xebc983b0, sys_thread_t:0x68ca0, state:CW)
prio=10
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java, Compiled Code)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:114)
"Signal dispatcher" (TID:0xebc983e0, sys_thread_t:0x63cf0, state:R)
prio=5
"Thread-2" (TID:0xebcbdaa8, sys_thread_t:0x26dd8, state:CW) prio=5
Monitor Cache Dump:
java.lang.ref.ReferenceQueue$Lock@EBC735D0/EBF4FEB8: <unowned>
Waiting to be notified:
"Thread-1" (0x79e358)
java.lang.ref.ReferenceQueue$Lock@EBC98338/EBCCDD50: <unowned>
Waiting to be notified:
"Finalizer" (0x6d060)
sun.awt.PostEventQueue@EBCC2288/EBDD5AB0: <unowned>
Waiting to be notified:
"SunToolkit.PostEventQueue-0" (0x49b728)
java.awt.EventQueue@EBCC2650/EBDB6468: <unowned>
Waiting to be notified:
"AWT-EventQueue-0" (0x49ad10)
java.lang.ref.Reference$Lock@EBC983C0/EBCCD890: <unowned>
Waiting to be notified:
"Reference Handler" (0x68ca0)
java.lang.ref.ReferenceQueue$Lock@EBC9E7F8/EBDFE898: <unowned>
Waiting to be notified:
"Thread-0" (0x5f7150)
Registered Monitor Dump:
PCMap lock: <unowned>
utf8 hash table: <unowned>
JNI pinning lock: <unowned>
JNI global reference lock: <unowned>
BinClass lock: <unowned>
Class linking lock: <unowned>
System class loader lock: <unowned>
Code rewrite lock: <unowned>
Heap lock: <unowned>
Monitor cache lock: owner "Signal dispatcher" (0x63cf0) 1 entry
Dynamic loading lock: <unowned>
Monitor IO lock: <unowned>
User signal monitor: <unowned>
Child death monitor: <unowned>
I/O monitor: <unowned>
Waiting to be notified:
"AWT-Motif" (0x4bd258)
Alarm monitor: <unowned>
Waiting to be notified:
<unknown thread> (0x2c0c8)
Thread queue lock: owner "Signal dispatcher" (0x63cf0) 1 entry
Waiting to be notified:
"Thread-2" (0x26dd8)
Monitor registry: owner "Signal dispatcher" (0x63cf0) 1 entry
================== Program Output =====================
1. Creating ImageTranscoder...
Font specified in font.properties not found [-urw-itc
zapfdingbats-medium-r-normal--*-%d-*-*-p-*-sun-fontspecific]
<More such Font errors deleted here>
2. Creating OutputStream...
3. Creating InputStream...
4. Creating TranscoderInput/Output...
5. Transcoding...
ERROR: The JPEG quality has not been specified. Use the default one: no
compression
6. Closing input and output streams...
7. !!! DONE !!!
================== Program Source =====================
import java.io.*;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.batik.transcoder.image.JPEGTranscoder;
public class th {
public static void main (String args[]) {
System.out.println("1. Creating ImageTranscoder...");
ImageTranscoder t = new JPEGTranscoder();
System.out.println("2. Creating OutputStream...");
FileOutputStream fos = null;
try {
fos = new FileOutputStream("jj.jpeg");
} catch (FileNotFoundException e) {
System.out.println("Error in th: " + e);
}
OutputStream os = new BufferedOutputStream (fos);
System.out.println("3. Creating InputStream...");
String sv = "<svg width=\"50\" height=\"40\"><rect x=\"0\" y=\"0\"
width=\"10\" height=\"30\"/></svg>";
StringReader is = new StringReader(sv);
System.out.println("4. Creating TranscoderInput/Output...");
TranscoderInput ti = new TranscoderInput(is);
TranscoderOutput to = new TranscoderOutput(os);
System.out.println("5. Transcoding...");
try {
t.transcode(ti, to);
} catch (TranscoderException e) {
System.out.println("Error in th: " + e);
}
System.out.println("6. Closing input and output streams...");
try {is.close(); os.flush(); os.close();} catch (IOException e)
{System.out.println("Error in th: " + e); }
System.out.println("7. !!! DONE !!!");
}
}
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