NightOwl888 commented on PR #1089:
URL: https://github.com/apache/lucenenet/pull/1089#issuecomment-2585170593
It appears that there is a difference between the default when using:
- `StandardCharsets.UTF_8`
- `StandardCharsets.UTF_8.newDecoder()`
The default behavior of the latter is `CodingErrorAction.REPORT`, but the
same is not true when using the former (which is how Lucene normally passes it
to other APIs).
```java
@Test
public void testDefaultUTF8DecoderWithInvalidBytes() {
// Define a mix of valid and invalid UTF-8 bytes
byte[] testBytes = {
(byte) 0xE2, (byte) 0x82, (byte) 0xAC, // Valid UTF-8 for €
(byte) 0xC3, (byte) 0xA9, // Valid UTF-8 for é
(byte) 0xFF, // Invalid byte
(byte) 0x41, // Valid ASCII for 'A'
(byte) 0x80, // Invalid byte
(byte) 0xF0, (byte) 0x9F, (byte) 0x92, (byte) 0x96 // Valid
UTF-8 for 💖
};
// Decode the bytes using the default UTF-8 behavior
String decodedString = new String(testBytes, StandardCharsets.UTF_8);
// Print each character and its code point
System.out.println("Decoded String Code Points: ");
for (int i = 0; i < decodedString.length(); i++) {
System.out.printf("Character at position %d: %d%n", i, (int)
decodedString.charAt(i));
}
// Verify the decoded string (replacement character appears at invalid
bytes)
assertEquals("€é\uFFFDA\uFFFD💖", decodedString);
}
```
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