#60 openjdk's java.lang.Thread recently changed the field 'name' from [c to Ljava_lang_String

[Linyu Zhu]

http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/2cdb8c0719ad
This effects initialiseThreadStage2() in which FieldBlock name can no longer be found using type '[C'

Need to Check the version of openjdk8 before get this field.