Weblogic-hack in LayoutContext gets stuck when decoding multi-byte characters
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Key: STS-912
URL: http://www.stripesframework.org/jira/browse/STS-912
Project: Stripes
Issue Type: Bug
Components: Tag Library
Affects Versions: Release 1.5.7
Environment: Windows 7 Pro
Weblogic 10.3.6.0
Tested from Eclipse Kepler
Reporter: Ulrik Skovenborg
Attachments: StripesBug.war
In {{net.sourceforge.stripes.tag.layout.LayoutContext}} there's a newly
implemented Weblogic-hack (see STS-834 and STS-823) that contains a bug when
decoding multi-byte characters (i.e. all non-english characters).
In the {{net.sourceforge.stripes.tag.layout.MyServletOutputStream.write(byte[],
int, int)}}-method the output is written to the output stream by using a
ByteBuffer. Some characters may be multi-byte, like the Danish 'ΓΈ' ({{[-61,
-72]}}), which will hold two elements in the internal ByteBuffer-array.
If the last element in the array is the first half of the multi-byte character
({{[-61]}}) the code is supposed to save it for the next round -- which it
actually does. But for some reason the whole character is written to the buffer
again and not just the remaining byte. The buffer now contains {{[-61, -61,
-72...]}} instead of {{[-61, -72]}}. This causes the {{UTF_8$Decoder}} to
return a malformed input error.
This error is not handled by the Stripes-code which in the end causes the loop
in the write-method to repeat itself endlessly.
In the StripesBug.war I have implemented an example where the bug can be
reproduced.
I'm not sure if this qualifies for a major bug but since the whole page gets
stucked it will appear quite serious for the user.
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