What kind of Java type is “[B”?

That my friend is an array of bytes. In JNI, [B is used to describe an array ([) of bytes (B). An array of ints is [I etc.

You can get a bit more information on field descriptors here:
JNI Types and Data Structures (Table 3-2 should be what you are looking for).

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)