Generics bug with multiple interface inheritance?

Hi,
I've noticed what I believe to be a compiler bug (I am getting an error where I believe none should exist). Can someone please comment on the following use-case?
interface Interface1<SelfType extends Interface1<SelfType>>
interface Interface2
class Superclass implements A<Superclass>
class Dependant<Type extends Interface1<Type>>
   public static <Type extends Interface1<Type>> Dependant<Type> getInstance(Class<Type> c)
     return new Dependant<Type>();
class Subclass extends Superclass implements Interface2
Subclass()
    Dependant<Subclass> dependant = Dependant.getInstance(Subclass.class);
}The problem is that in the above code the compiler will complain that Dependant<Subclass> is illegal because "Subclass is not within its bounds" . The compiler requires that Subclass implement Interface1 and Interface2 directly and implementing Interface1 by extending Superclass doesn't seem to count. If you replace Subclass's definition by "class Subclass implements Interface1<Subclass>, Interface2" the problem goes away.
Is this a compiler bug?
Thank you,
Gili

Actually now I understand what you mean.... Ok, now I am going to modify the problem slightly and add Interface2 into the picture. The new code is:
interface Interface1<SelfType extends Interface1<SelfType>>
interface Interface2
class Superclass implements Interface1<Superclass>
class Dependant<Type extends Interface1<Type>>
   public static <Type extends Interface1<Type> & Interface2> Dependant<Type> getInstance(Class<Type> c)
     return new Dependant<Type>();
class Subclass extends Superclass implements Interface2
public Subclass()
    Dependant<Subclass> dependant = Dependant.getInstance(Subclass.class);
}Now, previously I could replace:
Dependant<Subclass> dependant = Dependant.getInstance(Subclass.class);
with
Dependant<Superclass> dependant = Dependant.getInstance(Superclass.class);
and it solved the problem, but now that Type must implement Interface2 I cannot.
The reason I added this requirement is that this is actually what is going on in my applicationI had made mistakely omited this detail from the original use-case.
Can you think up of a possible solution to this new use-case?
Thanks,
Gili

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Actually now I understand what you mean.... Ok, now I am going to modify the problem slightly and add Interface2 into the picture. The new code is:
interface Interface1<SelfType extends Interface1<SelfType>>
interface Interface2
class Superclass implements Interface1<Superclass>
class Dependant<Type extends Interface1<Type>>
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class Subclass extends Superclass implements Interface2
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}Now, previously I could replace:
Dependant<Subclass> dependant = Dependant.getInstance(Subclass.class);
with
Dependant<Superclass> dependant = Dependant.getInstance(Superclass.class);
and it solved the problem, but now that Type must implement Interface2 I cannot.
The reason I added this requirement is that this is actually what is going on in my applicationI had made mistakely omited this detail from the original use-case.
Can you think up of a possible solution to this new use-case?
Thanks,
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It's not exactly generics, you want the object to implement both List and Serializable. Generics would let you declare that the List should contain only Serializable objects (don't ask me to write the declaration though).
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Generics with multiple interfaces

I'm trying to figure out why the following is not valid:
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lhunath wrote:
Basically:
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It is possible to do this using covariant return types and a generic abstract factory, like this:
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
public class GT20 {
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      Deque<String> d = factory.create();
      List<String> l = factory.create();
   private interface DequeListFactory<T, L extends Deque<T> & List<T>> {
      L create();
   private static class LinkedListFactory<T> implements DequeListFactory<T, LinkedList<T>> {
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         return new LinkedList<T>();
}However, I would seriously question the use of such a factory. If you really have a need for a union of interfaces (I would suggest a design that requires/allows users to use your objects as Lists and Deques, something is seriously wrong), I would create such a union and use that in your contract. Java doesn't allow anonymous unions as you're trying to do, and using generics is just a hack. Here's what I might consider:
import java.util.Deque;
import java.util.LinkedList;
import java.util.List;
public class GT21 {
   private interface ListDeque<T> extends List<T>, Deque<T> {}
   private interface MyInterface<T> {
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Timesten replication with multiple interfaces sharing the same hostname

Hi,
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151.98.226.5 TBMAS10df2 TBMAS10df2-01 TBMAS10df2-ttrep
151.98.227.4 TBMAS9df1 TBMAS9df1-10 TBMAS9df1-ttrep
151.98.226.4 TBMAS9df1 TBMAS9df1-01 TBMAS9df1-ttrep
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ALTER REPLICATION REPLSCHEME
ADD ELEMENT HDF_GNP_CDPN_1 TABLE HDF_GNP_CDPN
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COLUMN ConflictResTimeStamp
REPORT TO '/sn/sps/HDF620/datamodel/tt41dataConflict.rpt'
MASTER tt41data ON "TBMAS9df1-ttrep"
SUBSCRIBER tt41data ON "TBMAS10df2-ttrep"
RETURN RECEIPT BY REQUEST
ADD ELEMENT HDF_GNP_CDPN_2 TABLE HDF_GNP_CDPN
CHECK CONFLICTS BY ROW TIMESTAMP
COLUMN ConflictResTimeStamp
REPORT TO '/sn/sps/HDF620/datamodel/tt41dataConflict.rpt'
MASTER tt41data ON "TBMAS10df2-ttrep"
SUBSCRIBER tt41data ON "TBMAS9df1-ttrep"
RETURN RECEIPT BY REQUEST;
On this subject moving from 6.0.x to 7.0.x there has been some changes I would like to better understand.
6.0.x reported in the documentation for Unix systems:
If a host contains multiple network interfaces (with different IP addresses),
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Now On Solaris I don't know how to let gethostbyname return more than one interface (the documention notes at this point:
If you have multiple network interface cards (NICs), be sure that “multi
on” is specified in the /etc/host.conf file. Otherwise, gethostbyname will not
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151.98.225.104.45312 151.98.227.4.14000 1049792 0 1049800 0 ESTABLISHED
151.98.227.5.14005 151.98.227.4.47307 1049792 0 1049800 0 ESTABLISHED
151.98.227.5.14005 151.98.227.4.48230 1049792 0 1049800 0 ESTABLISHED
151.98.227.5.46050 151.98.227.4.14005 1049792 0 1049800 0 ESTABLISHED
TBMAS10df2:/-# netstat -an|grep "151.98.226."
151.98.226.5.14000 151.98.226.4.47699 1049792 0 1049800 0 ESTABLISHED
151.98.226.5.14005 151.98.226.4.47308 1049792 0 1049800 0 ESTABLISHED
151.98.226.5.44949 151.98.226.4.14005 1049792 0 1049800 0 ESTABLISHED
Tried to trace with ttTraceMon but once I brought down one of the interfaces did not see any reaction on either node, if you have some info it would be really appreciated !
Cheers,
Mike

Hi Chris,
Thanks for the reply, I have few more queries on this.
1.Using the ROUTE CLAUSE we can use multiple IPs using priority level set, so that if highest priority level set in thr ROUTE clause for the IP is not active it will fall back to the next level priority 2 set IP. But cant we use ROUTE clause to use the multiple route IPs for replication simultaneously?
2. can we execute multiple schema for the same DSN and replication scheme but with different replication route IPs?
for example:
At present on my system, I have a replication scheme running for a specific DSN with stand alone Master-Subscriber mechanism, with a specific route IP through VLAN-xxx for replication.
Now I want to create and start another replication scheme for the same DSN and replication mechanism with a different VLAN-yyy route IP to be used for replication in parallel to the existing replication scheme. without making any changes to the pre-existing replication scheme.
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If so what are the steps. like how we need to change the existing schema?
Thanks In advance.
Naveen

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Peter,
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Peter Conrad <[email protected]> wrote:
Hi,
I think I have come across a bug: I have created a property set that
holds (among others)
a property of type integer / Multiple / Restricted. I have added allowed
values 1-9.
So far, everything is fine. I can set and retrieve these properties in
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setProperty(scope, propertyName, arrayList) where arrayList is a
java.util.ArrayList
containing java.lang.Long. I can retrieve values with getProperty(scope,
propertyName)
and get an ArrayList back. I can also see the selected properties under
localhost:7501/tools/...
What I cannot do, and what I think is a bug, is: I can't set the
property to an empty
ArrayList. If I try that in my servlet, or if I try to de-select all
the
values in the administration
console, I get an Exception:
com.beasys.commerce.foundation.exception.SystemException : Unexpected
error in EntityPropertyManager while setting property; check that value
is valid if property is restricted
So how can I set the property to an empty value? Calling setProperty
with a null value
doesn't work either.
Bye,
Peter

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Dear Friends:
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{code}
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{code}
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Any ideas?

roquec wrote:
It works well... with one, perhaps two diferent Jpanels, with two different queries. But my problem is that when I use, for example, 25 Jpanels with 25 different queries, that is, 25 Jpanels with 25 jprogress bar and each JPanel with tho swingworkers (one executor, and one timer), strange thing happens.
For example, when the Jpanel nº 3 countdown reaches 0, the Jpanel nº5 is refreshed, and when the Jpanel nº7 makes a query, the result is painted in the Jlabel of the Jpanel nº1, etc.
I suppose I'm doing something very wrong, but I don't know what.
Any ideas?Please look into javax.swing.Timer to do the work of your "MyTimer" class. The reason your implementation of a Timer class with SwingWorker won't work with 25 instances is because each SwingWorker executes on a thread from SwingWorker's thread pool which has a limited size (I believe it is 10). With javax.swing.Timer, you can use as many countdowns as you want with no problem because they will all use a shared Thread.

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Hi,
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Hi
Have you tried the suggestions in the article?
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We might still have to keep patience for Microsoft updates.
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AlFerrari,
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Gernot,
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Jan Oliver
/e: This seems to be my problem: http://www.novell.com/support/kb/doc.php?id=7000318 How do I solve this using the usual iptables? (The way described in the article doesn't work: "RTNETLINK answers: No such process" errors.)
Last edited by janoliver (2013-09-25 22:24:53)

Or you could bridge eth1 and wlan0, and make dnsmasq bind/listen on that bridge...

Generics bug with multiple interface inheritance?

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