HashMap null key crashes program

[Erhannis]

From what I can infer, HashMaps are replaced at runtime by a custom implementation, probably for better logging. However, it fails to account for null keys (which are valid for HashMaps, and not for the Hashtables, though I'm not certain if a true Hashtable is used anywhere). The following is a (slightly anonymized) stack trace:

.Debugger com.myprogram.Main
ODB: 28.Mar.07
ODB: Reading .debuggerDefaults file...
In target program2:
class com.myprogram.Main.main threw java.lang.NullPointerException
java.lang.NullPointerException
        at com.lambda.Debugger.Shadow.hashtablePut(Shadow.java:1977)
        at com.lambda.Debugger.D.hashMapPut(D.java:683)
        at com.lambda.Debugger.MyHashMap.put(MyHashMap.java:30)
        at com.myprogram.Main.main(Main.java:66)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.lambda.Debugger.Debugger.runTarget(Debugger.java:1141)
        at com.lambda.Debugger.Debugger$1.run(Debugger.java:1199)
        at java.lang.Thread.run(Thread.java:748)
ODB: 28.Mar.07 run complete.

The relevant lines of code in Main.main() would be:

HashMap<Integer, Integer> blah = new HashMap<>();
blah.put(5, 6);
blah.put(null, 1);
blah.put(7, 8);

which would crash on the third line, the one with a null key.

I'm attempting to fix the bug, but depending on how deep the rabbit hole goes, I may not make it.

[madhephaestus]

@BilLewis may be able to help, Bil?

[Erhannis]

I THINK I've fixed it, but it could be the case that there's some obscure functionality I've broken. Basically I replaced the two key.equals(k) in Shadow.java with Object.equals(key, k). It looks like it should work, and it appears to BE working, so maybe it's actually working. I'll try to make a pull request or something, later tonight.

[madhephaestus]

thats great! I would love to see this project get picked up and modernized :)