Re: NPE caught in handleClientEvent in latest cvs-version

On 21-8-2004 22:27, Leo Mekenkamp wrote:
> On Sat, 2004-08-21 at 15:32, Arjen van der Meijden wrote:
> 
>>I've adjusted the code of Ozone's InvokeServer (and a proxy of mine) to 
>>get the stacktrace of the NPE, here it is:
> 
> 
> Do you happen to have a minimal code set that will show the npe when
> being run against an empty db? If so, please send it.
> 
> (...)

This is untested, but derived from expectancy of the code's behaviour 
and the way my code handles things:

public interface TestNPE extends OzoneProxy
{
    public String toString();
}

public class TestNPEImpl extends OzoneObject implements TestNPE
{
    public String toString(){return "TestNPEImpl";}
    // You probably could even use Object's default-toString
}

And then call something like:

OzoneMap ozoneMap = db.createObject(NodeTreeMapImpl.class, "testmap");
// We need to have this class to be returned as a method-result, so 
stick it into an OzoneMap.
// You could also make another wrapper-class that simply creates the 
object and returns it.
TestNPE testNPE = db.createObject(TestNPEImpl.class);

ozoneMap.put("testNPE", testNPE);
ozoneMap.get("testNPE");
// Here it'll fetch the NPE, since the TestNPE-object will be the cmd.result


The log-statement at InvokeServer's line 92 log.fine("..." + cmd.result 
+ "...");
Will call the result-object's toString and that happens to be the 
Proxied-version of toString, which causes a NPE in the 
database.fetch-statement's call on the "current transaction".

I've now commented out that log-line in InvokeServer and Ozone works 
fine and since the StackTrace showed it was comming from that line... 
Anyway that is of course a workaround, not a fix.

Btw, the 1.2.x-dev version is more than twice as fast as the 
1.2-release, as far as I've tested it :)

Best regards,

Arjen



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