Versions of the JDK that are compiled with a C compiler (such as GCC) that treat chars as unsigned by default cause Java programs to interpret the value of an element in a byte array incorrectly. For example, the following code snippet will take the
FAIL path:

    byte[] bytearray = new byte[100];
    bytearray[50] = (byte)222;
    if (bytearray[50] == (byte)222)
        // PASS
    else
        // FAIL

At first glance it appears that modifying:

    typedef struct {
        char body[1];
    } ArrayOfByte;
    typedef ArrayOfByte ClassArrayOfByte;
    HandleTo(ArrayOfByte);

in src/share/java/include/oobj.h to be:

    typedef struct {
        signed char body[1];
    } ArrayOfByte;
    typedef ArrayOfByte ClassArrayOfByte;
    HandleTo(ArrayOfByte);

by adding the "signed" keyword should fix this problem.