Cassandra編譯問題關於lambda

Question

Cassandra源代碼是最新的，它是從git@github.com克隆的：apache/cassandra.git。

JDK版本爲1.8.0_05

操作系統：Linux 3.13.0-62泛型＃102 Ubuntu的SMP

[javac] **/cassandra/test/burn/org/apache/cassandra/utils/LongBTreeTest.java:83: error: reference to testRandomSelection is ambiguous 
[javac]   testRandomSelection(perThreadTrees, perTreeSelections, 
[javac]  ^
[javac] both method testRandomSelection(int,int,BTreeTestFactory) in LongBTreeTest and method testRandomSelection(int,int,Consumer<RandomSelection>) in LongBTreeTest match 
[javac] **/cassandra/test/burn/org/apache/cassandra/utils/LongBTreeTest.java:157: error: reference to testRandomSelection is ambiguous 
[javac]   testRandomSelection(perThreadTrees, 4, 
[javac]  ^
[javac] both method testRandomSelection(int,int,BTreeTestFactory) in LongBTreeTest and method testRandomSelection(int,int,Consumer<RandomSelection>) in LongBTreeTest match 
[javac] **/cassandra/test/burn/org/apache/cassandra/utils/LongBTreeTest.java:158: error: incompatible types: bad return type in lambda expression 
[javac]        (selection) -> 
[javac]       ^
[javac]  missing return value 
[javac] **/cassandra/test/burn/org/apache/cassandra/utils/LongBTreeTest.java:269: error: reference to testRandomSelection is ambiguous 
[javac]   testRandomSelection(perThreadTrees, perTreeSelections, (selection) -> { 
[javac]  ^
[javac] both method testRandomSelection(int,int,BTreeTestFactory) in LongBTreeTest and method testRandomSelection(int,int,Consumer<RandomSelection>) in LongBTreeTest match 
[javac] **/cassandra/test/burn/org/apache/cassandra/utils/LongBTreeTest.java:269: error: incompatible types: bad return type in lambda expression 
[javac]   testRandomSelection(perThreadTrees, perTreeSelections, (selection) -> { 
[javac]                ^
[javac]  missing return value 

後來，我嘗試使用不同的JDK版本編譯它，發現jdk1.8.0_11仍然存在相同的問題，但從jdk1.8.0_20開始，此問題已修復。

我想問一下是什麼原因導致了這個問題。任何人都可以告訴我來自JDK的bug ID嗎？

Answer 1

看起來像是在1.8.0_20中實際修復的JDK-8029718錯誤。通常，在與lambda類型推斷相關的javac編譯器中，1.8.0_20和1.8.0_40中修復了許多錯誤。建議使用最新的編譯器版本。