(multi-os-engine/multi-os-engine#154) Allow java 8 language feature
(multi-os-engine/multi-os-engine#154) Allow java 8 language feature

multi-os-engine/moe-core,multi-os-engine/moe-core,multi-os-engine/moe-core,multi-os-engine/moe-core,multi-os-engine/moe-core,multi-os-engine/moe-core,multi-os-engine/moe-core