Hello all,
I'm seeing a very odd behavior I could really use some assistance with.
The base error I'm getting is:
Could not find a coercion from type
com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab.
Which is pretty odd, especially considering that my classpath only contains
one "Tab" class, and "com.java.dse.cwp.eos.components.webdesign.objects.Tab"
is it.
Tab is just a container class which essentially has two String members, and
accessors, not that I think this matters.
The issue is reported from Tapestry in a loop component, when I try to loop
over a List<Tab> returned from this function:
Code:
public List<Tab> getTabs()
{
if (tabs == null && isValidProduct())
{
tabs = new ArrayList<Tab>();
tabs.addAll(product.getTabs());
tabs.add(new Tab(true, "Get It" /* TODO: put this in
the template! */,
null));
}
return tabs;
}
where 'tab' is a 'List<Tab>' and 'product.getTabs()' returns a 'List<Tab>'
I can comment out the line 'tabs.addAll(product.getTabs());' and everything
works (?!?!?) so I think something very odd is going on and the Tab class is
being munged behind the scenes.
The full (well, I truncated it a bit) error/stack is below:
ERROR [http-8080-1: Product]: Render queue error in
BeginRender[Product:d7.loop]: Failure writing parameter 'value' of component
Product:d7.loop: Could not find a coercion from type
com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
...
org.apache.tapestry5.ioc.internal.util.TapestryException: Failure writing
parameter 'value' of component Product:d7.loop: Could not find a coercion
from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
... [at classpath:com/java/dse/cwp/eos/components/webdesign/D7.tml, line 12]
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:948)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
writing parameter 'value' of component Product:d7.loop: Could not find a
coercion from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to
type com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available
coercions: ... [at
classpath:com/java/dse/cwp/eos/components/webdesign/D7.tml, line 12]
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.write(InternalComponentResourcesImpl.java:544)
Caused by: java.lang.IllegalArgumentException: Could not find a coercion
from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
...
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl.findOrCreateCoercion(TypeCoercerImpl.java:244)
ERROR [http-8080-1: RequestExceptionHandler]: Processing of request failed
with uncaught exception: Render queue error in BeginRender[Product:d7.loop]:
Failure writing parameter 'value' of component Product:d7.loop: Could not
find a coercion from type
com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
...
org.apache.tapestry5.internal.services.RenderQueueException: Render queue
error in BeginRender[Product:d7.loop]: Failure writing parameter 'value' of
component Product:d7.loop: Could not find a coercion from type
com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
... [at classpath:com/java/dse/cwp/eos/components/webdesign/D7.tml, line 12]
at
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:86)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
writing parameter 'value' of component Product:d7.loop: Could not find a
coercion from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to
type com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available
coercions: ... [at
classpath:com/java/dse/cwp/eos/components/webdesign/D7.tml, line 12]
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:948)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
writing parameter 'value' of component Product:d7.loop: Could not find a
coercion from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to
type com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available
coercions: ... [at
classpath:com/java/dse/cwp/eos/components/webdesign/D7.tml, line 12]
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.write(InternalComponentResourcesImpl.java:544)
Caused by: java.lang.IllegalArgumentException: Could not find a coercion
from type com.java.dse.cwp.eos.components.webdesign.objects.Tab to type
com.java.dse.cwp.eos.components.webdesign.objects.Tab. Available coercions:
...
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl.findOrCreateCoercion(TypeCoercerImpl.java:244)
If I change the code slightly, I get a different, but similar issue:
Essentially I get "java.lang.ClassCastException:
com.java.dse.cwp.eos.components.webdesign.objects.Tab cannot be cast to
com.java.dse.cwp.eos.components.webdesign.objects.Tab" which really weirds
me out.
Offending code (the exception occurs on the 'for (Tab...' line:
public List<Tab> getTabs()
{
if (tabs == null && isValidProduct())
{
tabs = new ArrayList<Tab>();
for (Tab tab : product.getTabs())
{
tabs.add(new Tab(tab.isDefault(),
tab.getText(), tab.getLink()));
}
tabs.add(new Tab(true, "Get It" /* TODO: put this in
the template! */,
null));
}
return tabs;
}
Error:
Render queue error in BeginRender[Product:if]: Failure reading parameter
'test' of component Product:if:
com.java.dse.cwp.eos.components.webdesign.objects.Tab cannot be cast to
com.java.dse.cwp.eos.components.webdesign.objects.Tab
Template offending line:
<t:if test="tabs">
Stack:
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
reading parameter 'test' of component Product:if:
com.java.dse.cwp.eos.components.webdesign.objects.Tab cannot be cast to
com.java.dse.cwp.eos.components.webdesign.objects.Tab [at
classpath:com/java/dse/cwp/eos/pages/Product.tml, line 11]
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:516)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:496)
at
org.apache.tapestry5.corelib.components.If._$read_parameter_test(If.java)
at org.apache.tapestry5.corelib.components.If.test(If.java:45)
at
org.apache.tapestry5.corelib.base.AbstractConditional.beginRender(AbstractConditional.java:59)
at
org.apache.tapestry5.corelib.base.AbstractConditional.beginRender(AbstractConditional.java)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.invokeComponent(ComponentPageElementImpl.java:206)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.run(ComponentPageElementImpl.java:164)
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:933)
... 74 more
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException:
com.java.dse.cwp.eos.components.webdesign.objects.Tab cannot be cast to
com.java.dse.cwp.eos.components.webdesign.objects.Tab [at
classpath:com/java/dse/cwp/eos/pages/Product.tml, line 11]
at
org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:62)
at
org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl$1.read(InternalComponentResourcesImpl.java:510)
... 82 more
Caused by: java.lang.ClassCastException:
com.java.dse.cwp.eos.components.webdesign.objects.Tab cannot be cast to
com.java.dse.cwp.eos.components.webdesign.objects.Tab
at com.java.dse.cwp.eos.pages.Product.getTabs(Product.java:92)
at
$PropertyConduit_12265bc215d.get($PropertyConduit_12265bc215d.java)
at
org.apache.tapestry5.internal.bindings.PropBinding.get(PropBinding.java:58)
... 83 more
I'd greatly appreciate some help in figuring this one out.
Thanks,
Levi
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