It looks like stepping through lambda bodies in Java 8 is possible. But does anyone know how it can be done in JDI?

It looks like stepping through lambda bodies in Java 8 is possible. But does anyone know how it can be done in JDI?

• when .allLineLocations is called on the Lam class, it does reflect all of these line numbers.
• when a JDI Event happens within the lambda class (e.g. from stepping), the .sourceName() of the location throws an AbsentInformationException

So my working hypothesis is that when the lambda's class is created at runtime, the JDI needs to do something to recognize that the new class's bytecode is coming from Lam.java.

• when .allLineLocations is called on the Lam class, it does reflect all of these line numbers.
• when a JDI Event happens within the lambda class (e.g. from stepping), the .sourceName() of the location throws an AbsentInformationException
• it looks like jdk.internal.org.objectweb.asm.* is doing a bunch of stuff related to copying the lambda
• I'm not sure if the map from source lines to bytecodes is kept in Java, or in the JDI

So my working hypothesis is that when the lambda's class is created at runtime, the JDI needs to do something to recognize that the new class's bytecode is coming from the old class's bytecode (which is in turn coming from from Lam.java). I don't know enough about the internal representation of java.lang.Class or com.sun.jdi.ClassType to know where to begin.