Dear all,
I'm a Sculptor and OAW newbie, but I'm impressed with the platform
possibilites. I'm using Sculptor 1.6.0
I think I have found a bug on the code generator in the Web CRUD project of
Sculptor, related to inheritance and Many-to-Many relations. If I make
Many-To-Many relationships between an Entity and its parent, or with the
Parent with himself, web application classes does not compile because of a
casting error. I have tried to solve it, using WebSpecialCases.xpt, but I
receive some strange (to me) errors.
At first I will show you an example of the bug. Later I will explain how I
tried to solve it, and where I'm stuck.
Module inheritanceSample {
abstract Entity Parent {
scaffold
String name key
String description
- Set<@Parent> buyer <-> seller
- Set<@Parent> seller <-> buyer
- Set<@SonOne> sonone <-> dad
}
Entity SonOne extends @Parent {
scaffold
String data1
- Set<@Parent> dad <-> sonone
}
}
When I generate the code, I works. However, when I run "mvn
-Dmaven.test.skip=true clean install" there are compilation errors:
/proyectos/sculptoride/workspaces/remato/remato-web/src/generated/java/es/aww/remato/inheritanceSample/web/UpdateSonOneAction.java:[98,33]
incompatible types
found : java.util.List<es.aww.remato.inheritanceSample.domain.SonTwo>
required:
java.util.Collection<es.aww.remato.inheritanceSample.domain.Parent>
/proyectos/sculptoride/workspaces/remato/remato-web/src/generated/java/es/aww/remato/inheritanceSample/web/CreateSonOneAction.java:[73,35]
incompatible types
found :
java.util.List<es.aww.remato.inheritanceSample.domain.SonThree>
required:
java.util.Collection<es.aww.remato.inheritanceSample.domain.Parent>
The problem is with the code at the Update<Entity>Action and
Create<Entity>Action classes. This is a sample of the broken code (from
UpdateSonOneAction.java):
protected List<SelectItem> getSonOneItems() {
Collection<Parent> buyer =
sonOneService.findAll(ServiceContextStore.get());
List<SelectItem> items = new ArrayList<SelectItem>();
for (Parent parentItem : buyer) {
if (parentItem instanceof SonOne) {
String label = String.valueOf(parentItem.getName());
items.add(new SelectItem(parentItem.getId(), label));
}
}
return items;
}
The problem is with the generic "Collection<Parent> buyer". The
"sonOneService.findAll" method returns "List<SonOne>" which can not be
directly cast to "Collection<Parent>".
Fortunately, using wildcards with generics (See:
http://today.java.net/pub/a/today/2004/01/15/wildcards.html?page=2) the
offending line can be fixed:
Collection<? extends Parent> buyer =
sonOneService.findAll(ServiceContextStore.get());
As changing the code manually is boring, I tried to fix the generator. I
downloaded the Sculptor 1.6.0 branch from the repository and I searched for
the template. It is JSFCrudGuiJava.xpt at the templates.web package. The
definition in the file is "getReferenceItems".
So I created a rule at WebSpecialCases.xpt to overwrite that definition.
Note that it is a very naive solution, as I don't know the posible impact on
other parts:
«IMPORT sculptormetamodel»
«IMPORT sculptorguimetamodel»
«EXTENSION extensions::helper»
«EXTENSION extensions::dbhelper»
«EXTENSION extensions::properties»
«EXTENSION extensions::guihelper»
«AROUND *getReferenceItems FOR ReferenceViewProperty»
«LET getRelatedAddTask() AS addTask»
protected java.util.List<javax.faces.model.SelectItem>
get«target.name.toFirstUpper()»Items() {
java.util.Collection<? extends
«reference.to.getDomainPackage()».«reference.to.name»> «name» =
«addTask.getPrimaryService().name.toFirstLower()».«addTask.getPrimaryServiceOperation().name»(«IF
isServiceContextToBeGenerated()»«serviceContextStoreClass()».get()«ENDIF»);
java.util.List<javax.faces.model.SelectItem> items = new
java.util.ArrayList<javax.faces.model.SelectItem>();
for («reference.to.getDomainPackage()».«reference.to.name»
«reference.to.name.toFirstLower()»Item : «name») {
if («reference.to.name.toFirstLower()»Item instanceof
«target.getDomainPackage()».«target.name») {
String label = «EXPAND
itemLabel(reference.to.name.toFirstLower()+"Item") FOR reference.to -»;
items.add(new
javax.faces.model.SelectItem(«reference.to.name.toFirstLower()»Item.getId(),label));
}
}
return items;
}
«ENDLET»
«ENDAROUND»
However, when I tried that, I obtained a null pointer exception (See the
attached stacktrace for more detail). I guess that the problem is that I can
not reference values from the original template. Could you please explain me
how can I do it?
Also, could you please also confirm if the inheritance problem is a bug? I
have found similar problems in JIRA, but i don't know if this is related to
them.
Thanks in advance for your responses, best regards,
http://www.nabble.com/file/p25238074/sculptor-inheritance-stacktrace.txt
sculptor-inheritance-stacktrace.txt
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