[Ipopt] Jipopt Java interface

Rafael de Pelegrini Soares rafael at vrtech.com.br
Fri Apr 18 13:37:31 EDT 2008

Dear Edson,

I don't think this is the source of the problem you've experienced,
because the Jipopt object is store in a raw pointer. No smart pointer is
used there (around line 600 of Jipopt.cpp):

/* create the IpoptProblem */
Jipopt* problem=new Jipopt(env, obj_this, n, m, nele_jac, nele_hess,

Once no smart pointer is used to store the object a regular 'delete'
should be used to destroy it.

Hope this helps.

On Fri, 2008-04-18 at 14:06 -0300, Edson Cordeiro do Valle wrote:
> Hello all
>         I took a look at the Java Native Interface and I found the 
> following function:
> JNIEXPORT void JNICALL Java_org_coinor_Ipopt_FreeIpoptProblem
> (JNIEnv *env,
> jobject obj_this,
> jlong pipopt){
>     // cast back our class
>     Jipopt *problem = (Jipopt *)pipopt;
>     if(problem!=NULL){
>         delete problem;
>     }
> }
> I don't think it is necessary since the smartpointers automatically 
> cleans the unused references as stated in the documentation:
> " As the SmartPtrs go out of scope, the reference count
>  will be decremented and the objects will automatically
>  be deleted."
> The calling to this function from java leads the Java Virtual Machine to 
> crash, so I suggest this function removal.
> Regards

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