[DrJava] [ drjava-Bugs-995715 ] local methods, return value

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Bugs item #995715, was opened at 2004-07-21 23:32
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 6
Submitted By: Neal Horowitz (nrhorowitz)
Assigned to: Nobody/Anonymous (nobody)
Summary: local methods, return value

Initial Comment:
Local methods in the interactions pane will be accepted
even if they do not correctly return a value, in which
case they will return null.  It is particularly bad in
the case of a function that returns a primitive.  For
example:

> int x() { }
> int i = x();
> Integer iBox = i; // autoboxing causes error here
(same error if you call new Integer(i) explicitly):
IllegalArgumentException: 
  at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
  at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
  at
java.lang.reflect.Constructor.newInstance(Constructor.java:494)
> int j = i + 1
NullPointerException:

This is pretty ugly behavior.  A primitive should never
be allowed to become null; perhaps now that we're taken
control of dynamicjava we can do something about this.

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