Bug#692556: java.lang.NullPointerException: Parameter alpha must not be null

Mathieu Malaterre malat at debian.org
Wed Nov 7 12:25:29 UTC 2012


Package: fop
Version: 1:1.0.dfsg2-6~bpo60+1
Severity: normal


fop is not capable of dealing with some PNG, it keeps on failing with:

Error while rendering page 9
java.lang.NullPointerException: Parameter alpha must not be null

Exception
java.lang.NullPointerException: Parameter alpha must not be null



Input is:

$ pnginfo test.png
test.png...
  Image Width: 411 Image Length: 225
  Bitdepth (Bits/Sample): 8
  Channels (Samples/Pixel): 1
  Pixel depth (Pixel Depth): 8
  Colour Type (Photometric Interpretation): PALETTED COLOUR with alpha (18 colours, 17 transparent) 
  Image filter: Single row per byte filter 
  Interlacing: No interlacing 
  Compression Scheme: Deflate method 8, 32k window
  Resolution: 0, 0 (unit unknown)
  FillOrder: msb-to-lsb
  Byte Order: Network (Big Endian)
  Number of text strings: 0 of 0


As a simple workaround:

$ convert test.png new.png
$ pnginfo new.png
new.png...
  Image Width: 411 Image Length: 225
  Bitdepth (Bits/Sample): 8
  Channels (Samples/Pixel): 4
  Pixel depth (Pixel Depth): 32
  Colour Type (Photometric Interpretation): RGB with alpha channel 
  Image filter: Single row per byte filter 
  Interlacing: No interlacing 
  Compression Scheme: Deflate method 8, 32k window
  Resolution: 0, 0 (unit unknown)
  FillOrder: msb-to-lsb
  Byte Order: Network (Big Endian)
  Number of text strings: 0 of 0

...just works out of the box !

-- System Information:
Debian Release: 6.0.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable'), (200, 'testing'), (100, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-0.bpo.3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages fop depends on:
ii  default-jre-headl 1:1.6-40               Standard Java or Java compatible R
ii  gcj-4.4-jre-headl 4.4.5-2                Java runtime environment using GIJ
ii  gcj-jre-headless  4:4.4.5-1              Java runtime environment using GIJ
ii  libfop-java       1:1.0.dfsg2-6~bpo60+1  XML formatter driven by XSL Format
ii  openjdk-6-jre-hea 6b18-1.8.13-0+squeeze2 OpenJDK Java runtime, using Hotspo

Versions of packages fop recommends:
ii  libsaxon-java                 1:6.5.5-6  The Saxon XSLT Processor

Versions of packages fop suggests:
pn  fop-doc                <none>            (no description available)
ii  libservlet2.5-java     6.0.35-1+squeeze2 Servlet 2.5 and JSP 2.1 Java API c

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