Are you sure that the jar files are in your classpath / in your .war
file? I.e. are you sure that it did work at the beginning? PDFs with JPX
images don't happen often.
I think a similar problem was mentioned here some months ago... but
there (I think) it was some IBM server...
Tilman
Am 21.07.2017 um 21:28 schrieb Chris Gamache:
Hi all,
I'm using PDFBox 2.0.7 to extract pages from PDFs, convert them to images
and stream them back out.
I have included
<dependency>
<groupId>com.levigo.jbig2</groupId>
<artifactId>levigo-jbig2-imageio</artifactId>
<version>1.6.5</version>
</dependency>
<dependency>
<groupId>com.github.jai-imageio</groupId>
<artifactId>jai-imageio-core</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>com.github.jai-imageio</groupId>
<artifactId>jai-imageio-jpeg2000</artifactId>
<version>1.3.0</version>
</dependency>
I can fire up tomcat and everything works fine... The next day at some
point I get
ERROR 15:11:13,114 [http-nio-8080-exec-1 PDFStreamEngine] - Cannot read
JPEG2000 image: Java Advanced Imaging (JAI) Image I/O Tools are not
installed
which boggles my mind! They were just there. How could they disappear? Of
course, after a restart everything is fine again-- until next time.
Disk space is fine. RAM is fine. Swap is fine. Nothing else seems adversely
affected.
The way I see it working is:
org.apache.pdfbox.filter.JPXFilter#readJPX
calls org.apache.pdfbox.filter.Filter#findImageReader and that then
iterates over an ImageReader collection provided
by javax.imageio.ImageIO#getImageReadersByFormatName ...
That collection is contained in a singleton IIORegistry obtained from
javax.imageio.spi.IIORegistry#getDefaultInstance.
When that IIORegistry is constructed, it walks the classpath looking for
service provider instances
in javax.imageio.spi.IIORegistry#registerApplicationClasspathSpis ...
It obviously finds the JPEG2000 SPI early on, but then forgets it later. I
can't see how that would be possible, or how to remedy it!
Please help!
Thanks so much,
CG
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