ClassCastException _$$_javassist_

joslash · **Joined:** Fri Sep 25, 2009 1:09 pm **Posts:** 1

Hi there!

Last week I update the hibernate.jar from version 3.2 to 3.3.2-GA. Unfortunately, I get an error about class cast and _$$javassit_ with a super class (First time I use inheritance with hibernate). With hibernate 3.2 everything was working just right.

I have a super class called AFEPlaza with two subclasses: CentroCostoAFEPuesto and ProyectoInstitucionalAFEPuesto.

This is the code line where I get the error:

Code:

return new BigDecimal(((CentroCostoAFEPuesto) this.plaza).getMaxHorasUniv());

This is the error message I get:

Code:

java.lang.ClassCastException: mx.edu.um.afe.model.AFEPlaza_$$_javassist_68 cannot be cast to mx.edu.um.afe.model.CentroCostoAFEPuesto
        at mx.edu.um.afe.model.ContratoAFEAlumno.getMaximoHoras(ContratoAFEAlumno.java:260)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
        at mx.edu.um.afe.model.ContratoAFEAlumno_$$_javassist_83.getMaximoHoras(ContratoAFEAlumno_$$_javassist_83.java)
        at mx.edu.um.afe.service.impl.InformeAFEHorasManagerImpl.calcularBecaAdicional(InformeAFEHorasManagerImpl.java:158)
        at mx.edu.um.afe.service.impl.InformeAFEHorasManagerImpl.saveInformeAFEHoras(InformeAFEHorasManagerImpl.java:63)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:203)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:162)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:209)
        at $Proxy86.saveInformeAFEHoras(Unknown Source)
        at mx.edu.um.afe.webapp.action.InformeAFEHorasAction.save(InformeAFEHorasAction.java:229)

Please, if someone could help me to know what is _$javassist_ and how to handle that kind of classes... Thx!

soddino · **Joined:** Sat Sep 26, 2009 9:18 pm **Posts:** 1

I have the same problem too.

Froestel · **Posted:** Sun Sep 27, 2009 7:31 am

Hi joslash,

the class

Code:

mx.edu.um.afe.model.AFEPlaza_$$_javassist_68

is a Hibernate generated proxy of your super class AFEPlaza. Since the proxy is not a subclass of your class CentroCostoAFEPuesto it cannot be cast to it.

If you require to have these casts in your app you should implement an interface with your business methods for each of your classes. Create one for your super class AFEPlaza and let the super class implement it. Also create one for each subclass and let them implement it. The interfaces for the subclasses should extend the superclass's interface.

Then, in your mapping tell Hibernate to use these interfaces for proxying with

Code:

Then casting should work since your proxied object will then be a subclass of the interface and as such you can at least cast it to that interface.

CU
Froestel