On 08/04/2018 21:29, Christopher Schultz wrote:


Does Tomcat do its own UTF-8 decoding because the JVM doesn't have a
facility to convert from ByteBuffer to CharBuffer? That seems like
something the JVM really should be providing...

No. It does it because the JRE UTF-8 decoder is buggy. Some bugs were fixed in Java 8 and the rest in Java 9 so we need this decoder until Java 9 is the minimum.

The issue is that incorrect decoding can lead to 'unexpected' behaviour when parsing URLs (read some form of security vulnerability).


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