Mauro Molinari created GROOVY-10757:
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Summary: Regression from 2.5.16+: ClassCastException at runtime
Key: GROOVY-10757
URL: https://issues.apache.org/jira/browse/GROOVY-10757
Project: Groovy
Issue Type: Bug
Components: Compiler
Affects Versions: 2.5.18, 2.5.17, 2.5.16
Reporter: Mauro Molinari
I've found a very nasty bug in Groovy 2.5.16+.
It's really hard to extract a simple test case, so I'll try to explain what is
going on as much as possible.
I have a {{@CompileStatic}} Groovy class hierarchy. Compilation succeeds, but a
{{ClassCastException}} happens at runtime. The hierarchy is like this:
{code:groovy}
@Named
@CompileStatic
@Scope('session')
abstract class GenericServicePurchaseBean<T extends GenericServicePurchaseDao>
implements Serializable {
T dao
void setDao(final T dao) {
this.dao = dao
}
protected abstract List<? extends ProductIdto> retrieveAvailableProducts()
@CompileDynamic // see note below
void resetState() {
// ...
retrieveAvailableProducts()
// ...
}
}
{code}
{code:groovy}
@Named
@CompileStatic
@Scope('session')
class FooPurchaseBean extends GenericServicePurchaseBean<FooPurchaseDao> {
@Inject
@Named('fooPurchaseDao')
@Override
void setDao(final FooPurchaseDao dao) {
super.setDao(dao)
}
@Override
protected List<? extends ProductIdto> retrieveAvailableProducts() {
dao.loadAllAvailableProductsForNewPurchase(customer)
}
@Override
void resetState() {
super.resetState();
// ...
}
}
{code}
The error I get at runtime is this:
{noformat}
Caused by: java.lang.ClassCastException: class
it.dcssrl.shop.web.purchase.view.dao.FooPurchaseDao$$EnhancerBySpringCGLIB$$271ceca2
cannot be cast to class it.dcssrl.shop.web.purchase.view.dao.BarPurchaseDao
(it.dcssrl.shop.web.purchase.view.dao.FooPurchaseDao$$EnhancerBySpringCGLIB$$271ceca2
and it.dcssrl.shop.web.purchase.view.dao.BarPurchaseDao are in unnamed module
of loader org.apache.catalina.loader.ParallelWebappClassLoader @5a075a)
at
it.dcssrl.shop.web.purchase.view.FooPurchaseBean.retrieveAvailableProducts(FooPurchaseBean.groovy:217)
at
org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234)
at
it.dcssrl.shop.web.purchase.view.GenericServicePurchaseBean.resetState(GenericServicePurchaseBean.groovy:682)
at
it.dcssrl.shop.web.purchase.view.FooPurchaseBean.resetState(FooPurchaseBean.groovy:148)
[...]
{noformat}
If I remove the Groovy compiler optimization to enable Indy compilation, the
error happens all the same, but the stack trace does not have the line about
{{org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:234)}}.
Please note that:
- this problem does not happen with Groovy 2.5.15
- it happens with Groovy 2.5.16, 2.5.17 and 2.5.18
- it DOES NOT happen if compiling/running the application within Eclipse/WTP
and Groovy Eclipse plugin
- the {{resetState()}} method above in the base class is marked with
{{@CompileDynamic}} because of another nasty problem I was not able to isolate,
which otherwise produces another {{ClassCastException}} at runtime, although
completely different from this one; this has been happening from 2.5.13 at
least (it was not occurring with 2.5.9)
Any idea of what is going on? And of a possible not-too-dirty workaround (apart
from downgrading to Groovy 2.5.15)?
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