Java 8中的IncompatibleClassChangeError（Lambda表达式）

Question

我正在尝试学习lambda表达式，因此http://www.oracle.com/technetwork/articles/java/lambda-1984522.html之后。 下载了IDE和JDK

  

支持JDK 8的JDK 8 Eclipse IDE

但是在编译下面的代码后，我有一个例外

Exception in thread "main" java.lang.IncompatibleClassChangeError
    at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:444)
    at com.ahmetk.java8.Hello.main(Hello.java:10)
Caused by: java.lang.NoSuchMethodException: no such method: java.lang.invoke.LambdaMetafactory.metaFactory(Lookup,String,MethodType,MethodHandle,MethodHandle,MethodType)CallSite/invokeStatic
    at java.lang.invoke.MemberName.makeAccessException(MemberName.java:800)
    at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:917)
    at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1101)
    at java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:1363)
    at java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:442)
    ... 1 more
Caused by: java.lang.NoSuchMethodError: java.lang.invoke.LambdaMetafactory.metaFactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
    at java.lang.invoke.MethodHandleNatives.resolve(Native Method)
    at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:889)
    at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:914)

我正在尝试执行的简单代码。

public class Hello {
    interface HelloService {
        String hello(String firstname, String lastname);
    }

    public static void main(String[] args) {

        HelloService helloService = (String firstname, String lastname) -> {
            String hello = "Hello " + firstname + " " + lastname;
            return hello;
        };
        System.out.println(helloService.hello(args[0], args[1]));

    }
}

Answer 1

eclipse在支持java8方面存在问题。我已成功编译并在命令提示符

上运行

  

D：\ tools \ java \ jdk1.8.0_32Bit \ bin \ javac com / ahmetk / java8 / Hello.java

     

D：\ tools \ java \ jdk1.8.0_32Bit \ bin \ java -cp。 com.ahmetk.java8.Hello 12 12   你好12 12

Answer 2

如果使用的是Maven，请添加pom.xml

WidthProperty.Name