In my PartialDate class, I have a field called precision, which is of type PrecisionCode.

It has the usual get/set methods, as below
public PrecisionCode getPrecision() {
return precision;
}

public void setPrecision(PrecisionCode precision) {
this.precision = precision;
}

I have two get/set methods called getPrecisionChar/setPrecisionChar as well, implemented below

protected char getPrecisionChar() {
return precision.getPrecision();
}

protected void setPrecisionChar(char precision) {
this.precision = PrecisionCode.valueOf(precision);
}

I don't have a precisionChar field (e.g. private variable), but I want to persist the PrecisionChar into the database. The mapping file is below. However I get a PropertyNotFound exception also shown below. It seems to be complaining that the field precisionChar cannot be found, which is fair because I never declared it. But getPrecisionChar and setPrecisionChar work from the precisionCode field. In hibernate, how to I get precisionChar to be persisted to the database?

[b]Hibernate version: 2.1.7[/b]

[b]Mapping documents:[/b]

<hibernate-mapping package="test" >
<class name="PersistableDate" table="PersistableDate">
<id name="id" type="int">
<generator class="increment"/>
</id>
<property name="name" />

<component name="testDate" class="PartialDate">
<property name="precisionChar" column="testDatePrec"/>
</component>

</class>
</hibernate-mapping>


[b]Code between sessionFactory.openSession() and session.close():[/b]

[b]Full stack trace of any exception that occurs:[/b]
[ERROR] (hibernate.cfg.Configuration ) - Could not compile the mapping document
net.sf.hibernate.MappingException: Problem trying to set property type by reflection
at net.sf.hibernate.mapping.SimpleValue.setTypeByReflection(SimpleValue.java:183)
at net.sf.hibernate.cfg.Binder.createProperty(Binder.java:1069)
at net.sf.hibernate.cfg.Binder.bindComponent(Binder.java:870)
at net.sf.hibernate.cfg.Binder.propertiesFromXML(Binder.java:1053)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:363)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1257)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:252)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:288)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:336)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:1018)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:974)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:902)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:888)
at test.TestPersister.main(TestPersister.java:35)
Caused by:
net.sf.hibernate.PropertyNotFoundException: field not found: precisionChar
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:74)
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:80)
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:80)
at net.sf.hibernate.property.DirectPropertyAccessor.getGetter(DirectPropertyAccessor.java:88)
at net.sf.hibernate.util.ReflectHelper.getter(ReflectHelper.java:81)
at net.sf.hibernate.util.ReflectHelper.reflectedPropertyType(ReflectHelper.java:86)
at net.sf.hibernate.mapping.SimpleValue.setTypeByReflection(SimpleValue.java:172)
... 13 more
net.sf.hibernate.MappingException: Error reading resource: PersistableDate.hbm.xml
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:339)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:1018)
at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:974)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:902)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:888)
at test.TestPersister.main(TestPersister.java:35)
Caused by: net.sf.hibernate.MappingException: Problem trying to set property type by reflection
at net.sf.hibernate.mapping.SimpleValue.setTypeByReflection(SimpleValue.java:183)
at net.sf.hibernate.cfg.Binder.createProperty(Binder.java:1069)
at net.sf.hibernate.cfg.Binder.bindComponent(Binder.java:870)
at net.sf.hibernate.cfg.Binder.propertiesFromXML(Binder.java:1053)
at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:363)
at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1257)
at net.sf.hibernate.cfg.Configuration.add(Configuration.java:252)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:288)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:336)
... 5 more
Caused by: net.sf.hibernate.PropertyNotFoundException: field not found: precisionChar
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:74)
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:80)
at net.sf.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:80)
at net.sf.hibernate.property.DirectPropertyAccessor.getGetter(DirectPropertyAccessor.java:88)
at net.sf.hibernate.util.ReflectHelper.getter(ReflectHelper.java:81)
at net.sf.hibernate.util.ReflectHelper.reflectedPropertyType(ReflectHelper.java:86)
at net.sf.hibernate.mapping.SimpleValue.setTypeByReflection(SimpleValue.java:172)
... 13 more

[b]Name and version of the database you are using:[/b]
SQL Server 2000

according to the stacktrace you have activated direct field access (access="field") and thus it will check for a field instead of a property (methods).

Don't set access to something and it should work.

Thanks for your answer. However I have not set "access" to equal anything here. The default is property and so it uses the getter/setter methods to access fields, but still does not work for some reason.

what is the type of id in your class int or Integer?

It is type Integer. I'm sorry, I cannot see how this relates to the original question. I must be doing something so stupid so any direction is greatly appreciated

looking at the hibernate code (which you also can do), I see that if it fails to look up the property accessor it retries with field access (actually a surprise to me too ,)

Do you run under special security permissions that might prevent hibernate from getting to the protected property ? What happens if you make the get-sets public does it work then ?

try to step in with a debugger and see what exception that is thrown at line 81 of ReflectHelper since it tries to use field access.

change


to

[quote="max"]looking at the hibernate code (which you also can do), I see that if it fails to look up the property accessor it retries with field access (actually a surprise to me too ,)

Do you run under special security permissions that might prevent hibernate from getting to the protected property ? What happens if you make the get-sets public does it work then ?

try to step in with a debugger and see what exception that is thrown at line 81 of ReflectHelper since it tries to use field access.[/quote]

Changing to public seems to work, however I'd prefer the methods to be protected as they are only accessed in the subclass. I have tested that Hibernate functions perfectly with protected methods, but I am baffled that it is not the case here. Is this something to report to JIRA? I will step through with the debugger later and report back my findings.

step in with the debugger before reporting this to jira - this stuff does work (as you have seen in other cases too ,)

We've found the problem.

Apparently the code obfuscator that we used changed the method names so that hibernate could not find them. When the method name is public, the obfuscator didn't touch them, however when they were protected they were modified, so it confused hibernate.