FULL PRODUCT VERSION :
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Upon trying to compile the sample code, Javac crashes with a NullPointerException
The lines that cause this are 7-8 and 10-11

REGRESSION. Last worked in version 8u5

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Successful compile
ACTUAL -
ant -f C:\\Users\\User\\Desktop\\JavacCrash -Dnb.internal.action.name=build jar
init:
Deleting: C:\Users\User\Desktop\JavacCrash\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\User\Desktop\JavacCrash\build\built-jar.properties
Compiling 3 source files to C:\Users\User\Desktop\JavacCrash\build\classes
An exception has occurred in the compiler (1.8.0_20). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
C:\Users\User\Desktop\JavacCrash\nbproject\build-impl.xml:948: The following error occurred while executing this line:
C:\Users\User\Desktop\JavacCrash\nbproject\build-impl.xml:288: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.List;
import java.util.logging.Logger;

public class DummyTest {
    private static final Logger LOG = Logger.getLogger(DummyTest.class.getName());
public static Thing foo(Iterable<String> rtf){
List<Thing> things = new Query<>(rtf).select(
Foo::getBar).toArrayList();
Query<Thing> query = new Query<>(things);
int estimate = query.aggregate(0,
(i, item)-> i + item.getItems().size());
Thing thing = new Thing(estimate);
return query.aggregate(thing, (result, item)->result.addBar(item));
}
}
---------- END SOURCE ----------