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Applications that accept untrusted input, especially Unicode-based input, should normalize the input before validating it. Character information in The following table shows the version of Unicode supported by the previous three release of Java SE.
| Java Version | Unicode Version |
|---|---|
| Java SE 6 |
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| Unicode Standard, version 4.0 [Unicode 2003] |
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| Java SE 7 |
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| Unicode Standard, version 6.0.0 [Unicode 2011] | |
| Java SE 8 | Unicode Standard, version 6.2.0 [Unicode 2012] |
Normalization . Normalization is important because in Unicode, the same string can have many different representations. According to the Unicode Standard [Davis 2008], annex #15, Unicode Normalization Forms:
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