Problem with lambda expression in initialization block

[François Sarradin]

Hi,

I am unable to run a test with a lambda expression in a initialization block.

Here is a code that fails:

/* ---- */
package testjava8;

import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;


public class MyTest {

    private static final Map<String, String> M1 = new HashMap<String,
String>() {{
        put("a", "z");
        put("b", "y");
    }};

    private static final Map<String, String> M2 = new HashMap<String,
String>() {{
        M1.forEach((l1, l2) -> {
            put(l2, l1);
        });
    }};

    @Test
    public void should_reverse() {
        assertEquals("a", M2.get("z"));
    }

}
/* ---- */

Here is the stack trace I get:

java.lang.BootstrapMethodError: call site initialization exception
	at java.lang.invoke.CallSite.makeSite(CallSite.java:298)
	at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:294)
	at testjava8.MyTest$2.<init>(MyTest.java:1)
	at testjava8.MyTest.<clinit>(MyTest.java:18)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:395)
	at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:187)
	at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:236)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:233)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:76)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.invoke.LambdaConversionException: Unsupported
MethodHandle kind: MethodHandleInfo[invokeSpecial
testjava8.MyTest$2.lambda$0(String,String)void]
	at java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:172)
	at java.lang.invoke.LambdaMetafactory.metaFactory(LambdaMetafactory.java:165)
	at java.lang.invoke.CallSite.makeSite(CallSite.java:283)
	... 28 more


Regards,

François