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schuldar
 Post subject: Exception initializing proxy
PostPosted: Wed Sep 03, 2003 7:24 pm 
Newbie

Joined: Thu Aug 28, 2003 11:49 am
Posts: 15
Location: Calgary, Alberta, Canada
Mappings:
Code:
<class name="com.envistatech.dbcompare.Column" mutable="false" proxy="com.envistatech.dbcompare.Column" table="user_tab_cols">
    <composite-id>
        <key-property name="tableName" column="table_name" length="30" type="string"/>           
        <key-property name="name" column="column_name" type="string" length="30" />       
    </composite-id>
    <one-to-one name="comment" class="com.envistatech.dbcompare.ColumnComment" constrained="true" outer-join="true"/>
</class>

<class name="com.envistatech.dbcompare.ColumnComment" mutable="false" proxy="com.envistatech.dbcompare.ColumnComment" table="user_col_comments">
    <composite-id>
        <key-property name="tableName" column="table_name" length="30" type="string"/>           
        <key-property name="name" column="column_name" length="30" type="string"/>       
    </composite-id>
    <property name="text" column="comments" length="4000" not-null="false" type="string"/>
</class>


Code:
Code:
Iterator i = session.iterate("from Column as c where c.tableName = 'ANALYTES'");
while (i.hasNext()) {
    Column column = (Column) i.next();
    System.out.println(column.getComment().getText());
}


Exception:
Code:
Sep 3, 2003 5:16:57 PM net.sf.hibernate.proxy.LazyInitializer initializeWrapExceptions
SEVERE: Exception initializing proxy
java.lang.ClassCastException
   at com.envistatech.dbcompare.ColumnCommentMetaClass0.getPropertyValues(<generated>)
   at net.sf.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:197)
   at net.sf.hibernate.type.ComponentType.nullSafeGetValues(ComponentType.java:171)
   at net.sf.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:158)
   at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:494)
   at net.sf.hibernate.loader.Loader.doFind(Loader.java:136)
   at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:587)
   at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:42)
   at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:396)
   at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:1889)
   at net.sf.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1698)
   at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:47)
   at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:54)
   at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:152)
   at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:55)
   at com.envistatech.dbcompare.ColumnComment$$EnhancedByCGLIB$$2.getText(<generated>)
   at com.envistatech.dbcompare.MappingTest.testColumnCommentThroughColumn(MappingTest.java:64)
   [... Stack snipped by me ...]
rethrown as net.sf.hibernate.PropertyAccessException: exception getting property value with CGLIB getter of com.envistatech.dbcompare.ColumnComment.?
   at net.sf.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:200)
   at net.sf.hibernate.type.ComponentType.nullSafeGetValues(ComponentType.java:171)
   at net.sf.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:158)
   at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:494)
   at net.sf.hibernate.loader.Loader.doFind(Loader.java:136)
   at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:587)
   at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:42)
   at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:396)
   at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:1889)
   at net.sf.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1698)
   at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:47)
   at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:54)
   at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:152)
   at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:55)
   at com.envistatech.dbcompare.ColumnComment$$EnhancedByCGLIB$$2.getText(<generated>)
   at com.envistatech.dbcompare.MappingTest.testColumnCommentThroughColumn(MappingTest.java:64)
    [... Stack snipped by me ...]
Caused by: java.lang.ClassCastException
   at com.envistatech.dbcompare.ColumnCommentMetaClass0.getPropertyValues(<generated>)
   at net.sf.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:197)
   ... 30 more


What am I doing wrong? I can query ColumnComment directly without a problem. I'm generating the Java classes using Hbm2Java... This is going against Oracle. thanks.
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gavin
 Post subject:
PostPosted: Wed Sep 03, 2003 9:10 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
This exception usually occurs when your object property type does not match the mapping. Disable the CGLIB reflection optimizer to get more useful information.
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schuldar
 Post subject:
PostPosted: Thu Sep 04, 2003 11:41 am 
Newbie

Joined: Thu Aug 28, 2003 11:49 am
Posts: 15
Location: Calgary, Alberta, Canada
gavin wrote:
This exception usually occurs when your object property type does not match the mapping. Disable the CGLIB reflection optimizer to get more useful information.


I disabled the reflection optimizer and get this now:

Code:
Sep 4, 2003 9:32:09 AM net.sf.hibernate.util.ReflectHelper$Getter get
SEVERE: IllegalArgumentException in class: com.envistatech.dbcompare.ColumnComment, getter method of property: tableName
Sep 4, 2003 9:32:09 AM net.sf.hibernate.proxy.LazyInitializer initializeWrapExceptions
SEVERE: Exception initializing proxy
java.lang.IllegalArgumentException: object is not an instance of declaring class
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:324)
   at net.sf.hibernate.util.ReflectHelper$Getter.get(ReflectHelper.java:99)
   at net.sf.hibernate.type.ComponentType.getPropertyValue(ComponentType.java:186)
   at net.sf.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:206)
   at net.sf.hibernate.type.ComponentType.nullSafeGetValues(ComponentType.java:171)
   at net.sf.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:158)
   at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:494)
   at net.sf.hibernate.loader.Loader.doFind(Loader.java:136)
   at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:587)
   at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:42)
   at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:396)
   at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:1889)
   at net.sf.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1698)
   at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:47)
   at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:54)
   at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:152)
   at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:55)
   at com.envistatech.dbcompare.ColumnComment$$EnhancedByCGLIB$$2.getText(<generated>)
   at com.envistatech.dbcompare.MappingTest.testColumnCommentThroughColumn(MappingTest.java:65)
        [Stack snipped here...]


I'm not really sure what to make of this. The column types seem to match the mapping which match the generated Java classes. They're all Strings. (BTW: I'm using 2.0.3)
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gavin
 Post subject:
PostPosted: Thu Sep 04, 2003 11:48 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
OH, didn't notice the one-to-one mapping.


A one-to-one mapping requires that both classes have the same identifier type. Since you are using an "embedded" composite id, they don't in this case.


Use a composite id class, as recommended in Hibernate documentation.
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schuldar
 Post subject:
PostPosted: Thu Sep 04, 2003 12:01 pm 
Newbie

Joined: Thu Aug 28, 2003 11:49 am
Posts: 15
Location: Calgary, Alberta, Canada
Excellent. Thanks again.
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