The following JCK runtime 8 tests fail with JDK 8 b87:

api/java_time/tck/java/time/format/index.html#TCKOffsetPrinterParser
api/java_time/tck/java/time/chrono/index.html#TCKIsoChronology
api/java_time/tck/java/time/chrono/index.html#TestChronoLocalDate
api/java_time/tck/java/time/chrono/index.html#TestChronoLocalDateTime
api/java_time/tck/java/time/chrono/index.html#TestHijrahChronology
api/java_time/tck/java/time/chrono/index.html#TestJapaneseChronology
api/java_time/tck/java/time/chrono/index.html#TestMinguoChronology
api/java_time/tck/java/time/chrono/index.html#TestThaiBuddhistChronology
api/java_time/tck/java/time/format/index.html#TCKChronoPrinterParser
api/java_time/tck/java/time/format/index.html#TCKDateTimeFormatter
api/java_time/tck/java/time/format/index.html#TCKDateTimeFormatters
api/java_time/tck/java/time/format/index.html#TCKLocalizedFieldPrinter
api/java_time/tck/java/time/format/index.html#TCKZoneIdPrinterParser
api/java_time/tck/java/time/index.html#TCKDayOfWeek
api/java_time/tck/java/time/index.html#TCKInstant
api/java_time/tck/java/time/index.html#TCKLocalDate
api/java_time/tck/java/time/index.html#TCKLocalDateTime
api/java_time/tck/java/time/index.html#TCKLocalTime
api/java_time/tck/java/time/index.html#TCKMonth
api/java_time/tck/java/time/index.html#TCKMonthDay
api/java_time/tck/java/time/index.html#TCKOffsetDateTime
api/java_time/tck/java/time/index.html#TCKOffsetTime
api/java_time/tck/java/time/index.html#TCKYear
api/java_time/tck/java/time/index.html#TCKYearMonth
api/java_time/tck/java/time/index.html#TCKZoneId
api/java_time/tck/java/time/index.html#TCKZoneOffset
api/java_time/tck/java/time/index.html#TCKZonedDateTime
api/java_time/tck/java/time/index.html#TestChronology
api/java_time/tck/java/time/index.html#TestIsoChronology
api/java_time/tck/java/time/temporal/index.html#TCKDateTimeAdjusters
api/java_time/tck/java/time/temporal/index.html#TestChronoLocalDate
api/java_time/tck/java/time/temporal/index.html#TestChronoLocalDateTime
api/java_time/tck/java/time/temporal/index.html#TestChronoZonedDateTime

The failures are probably caused by JDK-8011172 (JSR 310)