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Re: [libvirt] getSchedulerParameters() always returning nullpointerexception in JAVA



OK, let's see if Bryan has an idea/solution about this.

Thanks guys!



MARC


El 11/12/2009, a las 14:29, Daniel Veillard escribió:

> On Fri, Dec 11, 2009 at 02:01:36PM +0100, Marc Gonzalez Mateo wrote:
>> Hi everyvody,
>> I'm developing a new API based on libvirt.
>> I'm currently stucked using getSchedulerParameters, always is returning a
>> nullpointerexception, no matter which Xen Domain I'm passing to the
>> function.
>> 
>> Enclosing both the code and the error console:
>> 
>> 
>> public int getCPUPriority(String name) {
>>        int res=-1;
>> 
>>        try {
>>            Domain d = getDomain(name);
>>            SchedParameter[] pars = d.getSchedulerParameters();
> 
>  Hum, it seems
> 
>    Domain.getSchedulerParameters()
> 
> does
> 
>    SchedParameter[] returnValue = new SchedParameter[0];
> 
> and
> 
>        public static SchedParameter create(virSchedParameter vParam) {
>            SchedParameter returnValue = null;
>            switch (vParam.type) {
>                case (1):
> 
> and the create method getting there gets a null pointer as the
> initialization argument, which it first dereference ...
> 
>  so not surprizing looking at the code, maybe Bryan has an idea of what
> is going on there, I'm a bit lost in this initialization process ...
> 
> Daniel
> 
>>            for (SchedParameter pri : pars) {
>>                if (pri.field=="weight")
>>                    res=Integer.parseInt(pri.getValueAsString());
>>            }
>> 
>>        } catch (LibvirtException e) {
>>            log.error(" Error: getting CPU priority of \""+name+"\"." +
>> e.getClass());
>>            e.printStackTrace();
>>        }
>> 
>>        return res;
>>    }
>> 
>> 
>> 
>> Dec 11, 2009 1:04:18 PM net.emotivecloud.virtmonitor.VirtMonitor
>> getCPUCapacity
>> SEVERE:  Error: getting CPU capacity of "XenTest".
>> java.lang.NullPointerException
>>    at org.libvirt.SchedParameter.create(Unknown Source)
>>    at org.libvirt.Domain.getSchedulerParameters(Unknown Source)
>>    at
>> net.emotivecloud.virtmonitor.VirtMonitor.getCPUCapacity(VirtMonitor.java:462)
>>    at net.emotivecloud.virtmonitor.VirtMonitor.main(VirtMonitor.java:763)
>>    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:616)
>>    at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:283)
>>    at java.lang.Thread.run(Thread.java:636)
>> 
>> 
>> Any ideas?
>> 
>> Thanks in advance,
>> 
>> 
>> Marc Gonzalez Mateo
> 
>> --
>> Libvir-list mailing list
>> Libvir-list redhat com
>> https://www.redhat.com/mailman/listinfo/libvir-list
> 
> 
> -- 
> Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
> daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
> http://veillard.com/ | virtualization library  http://libvirt.org/



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