[Hibernate-JIRA] Created: (HHH-6935) HibernateException in mysql Found: bit, expected: boolean
by orasio spieler (JIRA)
HibernateException in mysql Found: bit, expected: boolean
---------------------------------------------------------
Key: HHH-6935
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6935
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 4.0.0.Final
Environment: spring jpa hibernate project above mysql 5.1
Reporter: orasio spieler
Attachments: hib4-check.zip
Found the problem i also got org.hibernate.HibernateException: Wrong column type ... Found: bit, expected: boolean
on BooleanType in hibernate 4 they changed the Ctor to
public BooleanType() {
this( org.hibernate.type.descriptor.sql.BooleanTypeDescriptor.INSTANCE, BooleanTypeDescriptor.INSTANCE );
}
instead of old versions
public BooleanType() {
this( BitTypeDescriptor.INSTANCE, BooleanTypeDescriptor.INSTANCE );
}
spieler.orasio(a)gmail.com
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11 years, 1 month
[Hibernate-JIRA] Created: (HBX-1159) hbm2ddl outputfiles should be comparables
by Maillefer Jean-David (JIRA)
hbm2ddl outputfiles should be comparables
-----------------------------------------
Key: HBX-1159
URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-1159
Project: Hibernate Tools
Issue Type: Improvement
Affects Versions: 3.2.0.GA
Reporter: Maillefer Jean-David
Priority: Minor
It would be very helpful if hbm2ddl could generate comparable output files. By comparable, I mean that using a diff tool, the order of the generated SQL elements should be the same. It's already the case for columns. But it's missing for foreign-keys: each time hbm2ddl is run, their respective order is changed, thus making the use of diff tools nearly useless.
Sample code (for postgresql):
We can see that the order of primary-key fields membre_id and principal_id has changed, but the structure is the same !
Run 1:
create table AdhesionId (
id serial not null,
modification timestamp not null,
version int4,
membre_id int4 not null,
principal_id int4 not null,
primary key (id)
);
Run 2 (after a modification to a field in another class):
create table AdhesionId (
id serial not null,
modification timestamp not null,
version int4,
principal_id int4 not null,
membre_id int4 not null,
primary key (id)
);
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11 years, 1 month
[Hibernate-JIRA] Created: (HHH-4703) (cglib)Instrumented model with abstract MappedSuperclass and field access doesn't work
by Strong Liu (JIRA)
(cglib)Instrumented model with abstract MappedSuperclass and field access doesn't work
--------------------------------------------------------------------------------------
Key: HHH-4703
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4703
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.5.0-Beta-2, 3.3.2
Reporter: Strong Liu
Notes:
* test runs fine with cglib, hb 3.2.4 SP1 + ann 3.2.1
* test runs fine with cglib, plain mapping files (trunk).
* no matter if you use annotation or mapping files, test will fail using javassist (it used to fail with previous version too)
So focus on instrumentation done using cglib.
See attached testcase to reproduce the problem.
Guideline:
* testcase the pattern used in hb-core, just using annotations
* run org.hibernate.test.instrument2.runtime.CGLIBInstrumentationTest
* easy to switch from annotation to mapping files in org.hibernate.test.instrument2.cases.AbstractExecutable (comment/uncomment specific lines in getAnnotatedClasses and getXmlFiles)
interesting point: if you complete the source with id setters + annotate the getters (instead of fields) + make the getInterestRate @Transient, the test passes.
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11 years, 1 month
[Hibernate-JIRA] Created: (HHH-6813) @Id @OneToOne cause NullPointerException during query
by Alfio (JIRA)
@Id @OneToOne cause NullPointerException during query
-----------------------------------------------------
Key: HHH-6813
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6813
Project: Hibernate Core
Issue Type: Bug
Components: core, entity-manager
Affects Versions: 4.0.0.CR5, 3.6.8
Environment: Hibernate 4.0.0.CR5, PostgreSQL 9.1.1, Glassfish 3.1.1
Reporter: Alfio
Attachments: hibertest.war, hibertest.zip
I've two entities, Person and PersonInfo, with a one-to-one relation:
{code:title=Person.java}
@Entity
public class Person {
@Id
private Integer id;
@Basic
private String name;
@OneToOne( mappedBy = "id" )
private PersonInfo personInfo;
...getters&setters...
}
{code}
{code:title=PersonInfo.java}
@Entity
public class PersonInfo {
@Id
@OneToOne
private Person id;
@Basic
private String info;
...getters&setters...
}
{code}
Hibernate correctly creates two tables but a NPE occours during a simple select query (only if tables have one or more records)
em.createQuery("SELECT p FROM Person p").getResultList();
...
java.lang.NullPointerException
at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2202)
at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:661)
at org.hibernate.type.EntityType.resolve(EntityType.java:441)
at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:150)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1006)
at org.hibernate.loader.Loader.doQuery(Loader.java:883)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doList(Loader.java:2463)
at org.hibernate.loader.Loader.doList(Loader.java:2449)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2279)
at org.hibernate.loader.Loader.list(Loader.java:2274)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:196)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1118)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:252)
at com.sun.enterprise.container.common.impl.QueryWrapper.getResultList(QueryWrapper.java:195)
at nogroup.hibertest.Bean.execute(Bean.java:23)
at nogroup.hibertest.org$jboss$weld$bean-hibertest-1$0-SNAPSHOT-ManagedBean-class_nogroup$hibertest$Bean_$$_WeldClientProxy.execute(org$jboss$weld$bean-hibertest-1$0-SNAPSHOT-ManagedBean-class_nogroup$hibertest$Bean_$$_WeldClientProxy.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:737)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:467)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:254)
at com.sun.el.parser.AstValue.invoke(AstValue.java:228)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:43)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:56)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
... 33 more
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11 years, 1 month
[Hibernate-JIRA] Created: (HBX-1126) cannot start a jbpm proccess because the hibernated generated query, fails with informix 10
by sergio amaya (JIRA)
cannot start a jbpm proccess because the hibernated generated query, fails with informix 10
-------------------------------------------------------------------------------------------
Key: HBX-1126
URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-1126
Project: Hibernate Tools
Issue Type: Bug
Environment: informix 10, hibernate tools Version: 3.2.4
Reporter: sergio amaya
Attachments: datasource-ds.xml, hibernate.cfg.xml
i am working with seam + jbpm (jboss tools) and hibernate is creating this query on the jbpm tables:
the strange thing is that i can run the query and it works, im using informix 10
and if i change the database to postgresql (with another datasource), the hole thing works....
... i think is something about the dialect but im not sure, please help me guys!!
Hibernate generated query:
select first 1 processdef0_.ID_ as ID1_4_, processdef0_.NAME_ as NAME3_4_, processdef0_.DESCRIPTION_ as DESCRIPT4_4_, processdef0_.VERSION_ as VERSION5_4_, processdef0_.ISTERMINATIONIMPLICIT_ as ISTERMIN6_4_, processdef0_.STARTSTATE_ as STARTSTATE7_4_ from JBPM_PROCESSDEFINITION processdef0_ where processdef0_.NAME_=? order by processdef0_.VERSION_ desc
and the error is this
16:39:36,491 INFO [LongType] could not read column value from result set: ID1_4_; No such column name
16:39:36,507 WARN [JDBCExceptionReporter] SQL Error: -79738, SQLState: IX000
16:39:36,507 ERROR [JDBCExceptionReporter] No such column name
the stacktrace
16:39:36,710 ERROR [STDERR] org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:2223)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
at org.jbpm.db.GraphSession.findLatestProcessDefinition(GraphSession.java:153)
at org.jbpm.JbpmContext.newProcessInstanceForUpdate(JbpmContext.java:417)
at org.jboss.seam.bpm.BusinessProcess.createProcess(BusinessProcess.java:121)
at org.jboss.seam.bpm.BusinessProcessInterceptor.afterInvocation(BusinessProcessInterceptor.java:106)
at org.jboss.seam.bpm.BusinessProcessInterceptor.aroundInvoke(BusinessProcessInterceptor.java:49)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:26)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:27)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:126)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:95)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:110)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:240)
at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:210)
at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:84)
at $Proxy109.iniciarProceso(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:76)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:40)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:54)
at org.javassist.tmp.java.lang.Object_$$_javassist_3.iniciarProceso(Object_$$_javassist_3.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:329)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:342)
at org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58)
at org.jboss.el.parser.AstValue.invoke(AstValue.java:96)
at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:184)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:162)
at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:350)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.ja
16:39:36,710 ERROR [STDERR] va:281)
at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Unknown Source)
Caused by: java.sql.SQLException: No such column name
at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:348)
at com.informix.jdbc.IfxResultSet.findColumn(IfxResultSet.java:635)
at com.informix.jdbc.IfxResultSet.getLong(IfxResultSet.java:1129)
at org.jboss.resource.adapter.jdbc.WrappedResultSet.getLong(WrappedResultSet.java:724)
at org.hibernate.type.LongType.get(LongType.java:28)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154)
at org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1097)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:565)
at org.hibernate.loader.Loader.doQuery(Loader.java:701)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
... 121 more
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11 years, 1 month
[Hibernate-JIRA] Created: (HHH-6496) ClassCastException inside proxy without explicit casting in application code
by Joseph Calzaretta (JIRA)
ClassCastException inside proxy without explicit casting in application code
----------------------------------------------------------------------------
Key: HHH-6496
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6496
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.6.6
Environment: Hibernate version 3.6.6
database-independent
JDK 1.6
Windows 7 and Linux
CGLib and javassist
Reporter: Joseph Calzaretta
Attachments: ProxySubclassExample.zip
Noticed that an lazily-loaded entity was getting a ClassCastException inside the proxy method without any explicit casting in the application code. I've pared down the issue to a minimal example and attached a FunctionalTestCase. See:
{code:title=BaseClass.java}
public abstract class BaseClass
{
public abstract SubClass toSubClass();
}
{code}
{code:title=SubClass.java}
public class SubClass extends BaseClass
{
public Subclass toSubClass() {
return this;
}
}
{code}
{code:title=ProxySubclassTest.java}
public void testProxySubclass() throws Exception {
s = this.openSession();
tx = s.beginTransaction();
LazyReferenceToBaseClass lazyReferenceToBaseClass = (LazyReferenceToBaseClass) s.load(LazyReferenceToBaseClass.class, lazyReferenceToBaseClassId);
BaseClass baseClass = lazyReferenceToBaseClass.getBaseClass();
SubClass subClass = baseClass.toSubClass();
// Throws
// java.lang.ClassCastException: BaseClass_$$_javassist_1 cannot be cast to SubClass
// at BaseClass_$$_javassist_1.toSubClass(BaseClass_$$_javassist_1.java)
}
{code}
This is clearly related to "the dreaded proxy problem" with its variety of solutions/workarounds(http://community.jboss.org/wiki/ProxyVisitorPattern) but in those cases the application code makes a mistaken assumption that it can downcast a proxy. In this example, there is no explicit downcasting, although I suppose SubClass.toSubClass() could be considered "implicit downcasting". Within SubClass, "this" must refer to an instance of SubClass, and it presumably should be returnable as such.
I haven't checked what's going on in the proxy code, but I presume that it sees that it is trying to return the item corresponding to the proxy itself, and attempts to return that proxy. However the proxy is not an instance of SubClass and there is a ClassCastException.
I'd suggest one of the following solutions:
- have the proxy return the unproxied (already initialized) object if it cannot cast it appropriately
- have the proxy re-proxy the already initialized object into an instance of the appropriate class
- have some explicit documentation as to why this cannot be expected to work and why domain classes need to avoid this behavior.
In any case it seems poor that even improperly written entity code can cause an exception inside the proxy-specific code.
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11 years, 1 month