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ReggieBE
 Post subject: Dynamic instantion + Java dynamic arguments
PostPosted: Mon Mar 10, 2008 9:16 am 
Newbie

Joined: Mon Mar 10, 2008 8:55 am
Posts: 9
Hi,

I'd like to run a hql query with dynamic instantiation + unlimited arguments in the constructor. Therefor I created a class with a constructor with dynamic arguments:


Code:
public class MyClass {

   public MyClass(Object... obj) {
       // some code
   }

}


However ... hibernate can't instantiate this class because he can't find the right constructor.

Can anyone tell me whether this is possible ?






Details:

Hibernate version: 3.0.0

Full stack trace of any exception that occurs:
Caused by: org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [be.retailability.tellit.selector.oasis.lifesearch.LiveSearchStringArray] [select new be.retailability.tellit.selector.oasis.lifesearch.LiveSearchStringArray(hobj.voornaam,hobj.naam,hobj.rijksregisterNummer) from be.ugent.oasis.model.administratie.Persoon hobj where upper(naam) like '%DE B%' order by hobj.voornaam,hobj.naam,hobj.rijksregisterNummer]
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:31)
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:24)
at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:59)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:235)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
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:585)
at org.springframework.orm.hibernate3.HibernateTemplate$CloseSuppressingInvocationHandler.invoke(HibernateTemplate.java:1199)
at $Proxy41.createQuery(Unknown Source)
at be.retailability.util.hibernate.HibernateQueryCallbackFactoryImpl$LiveSearchCallback.doInHibernate(HibernateQueryCallbackFactoryImpl.java:301)
at be.retailability.util.hibernate.HibernateQueryCallbackFactoryImpl$LoggingCallback.doInHibernate(HibernateQueryCallbackFactoryImpl.java:140)
... 33 more


Name and version of the database you are using: Mysql 5

Debug level Hibernate log excerpt: debug


[/code]
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farzad
 Post subject: Re: Dynamic instantion + Java dynamic arguments
PostPosted: Mon Mar 10, 2008 11:59 am 
Expert
Expert

Joined: Wed Apr 11, 2007 11:39 am
Posts: 735
Location: Montreal, QC
leave a default constructor for hibernate.



Farzad-
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ReggieBE
 Post subject:
PostPosted: Tue Mar 11, 2008 5:14 am 
Newbie

Joined: Mon Mar 10, 2008 8:55 am
Posts: 9
These are my constructors right now:

Code:
    public LiveSearchStringArray() {
        // TODO Auto-generated constructor stub
    }
   
    public LiveSearchStringArray(Object... obj) {
        this.objects=obj;
    }


Hibernate gives the same error though.
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farzad
 Post subject:
PostPosted: Tue Mar 11, 2008 10:53 am 
Expert
Expert

Joined: Wed Apr 11, 2007 11:39 am
Posts: 735
Location: Montreal, QC
Ah, my bad. I didn't see the new thing in the query. I really think you should have a constructor that matches that one. Sorry again.


Farzad-
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ReggieBE
 Post subject:
PostPosted: Tue Mar 11, 2008 11:01 am 
Newbie

Joined: Mon Mar 10, 2008 8:55 am
Posts: 9
Hmm, but that's going to give really ugly code :\
This is my dirty fix at the moment (it kinda makes me sick ;))

Code:
    public LiveSearchStringArray(Object key, Object obj1, Object obj2, Object obj3, Object obj4, Object obj5) {
        this.objects = new Object[] {obj1, obj2, obj3, obj4, obj5};
        this.key = key;
    }
   
    public LiveSearchStringArray(Object key, Object obj1, Object obj2, Object obj3, Object obj4) {
        this.objects = new Object[] {obj1, obj2, obj3, obj4};
        this.key = key;
    }
   
    public LiveSearchStringArray(Object key, Object obj1, Object obj2, Object obj3) {
        this.objects = new Object[] {obj1, obj2, obj3};
        this.key = key;
    }
   
    public LiveSearchStringArray(Object key, Object obj1, Object obj2) {
        this.objects = new Object[] {obj1, obj2};
        this.key = key;
    }
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farzad
 Post subject:
PostPosted: Tue Mar 11, 2008 11:09 am 
Expert
Expert

Joined: Wed Apr 11, 2007 11:39 am
Posts: 735
Location: Montreal, QC
Umm, Object... implementation is in fact an array of Object[] right? I am wondering if you could modify the sql to call the constructor with an array of objects and see if it works. It might work.



Farzad-
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ReggieBE
 Post subject:
PostPosted: Tue Mar 11, 2008 12:19 pm 
Newbie

Joined: Mon Mar 10, 2008 8:55 am
Posts: 9
Hmm good idea .. I'll try it out and keep you posted
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ReggieBE
 Post subject:
PostPosted: Wed Mar 12, 2008 4:00 am 
Newbie

Joined: Mon Mar 10, 2008 8:55 am
Posts: 9
Aah too bad ... hibernate trips over the braces in its query:

Code:
unexpected char: '{' [select new be.retailability.util.model.LiveSearchStringArray(rijksregisternummer,new Object[] {hobj.rijksregisterNummer,hobj.naam,hobj.voornaam}) from be.ugent.oasis.model.administratie.Persoon hobj where upper(naam) like '00000%' order by hobj.rijksregisterNummer,hobj.naam,hobj.voornaam]
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flisy
 Post subject:
PostPosted: Wed Apr 23, 2008 5:53 am 
Newbie

Joined: Wed Apr 23, 2008 5:46 am
Posts: 1
Yes! Very important! Leave the default constructor also there!

ex.:
Code:
MyClass {
public MyClass(){}

public MyClass(Object ob1, Object ob2,...)
{ ..... }

}
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