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

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(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvir-list -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel(a)veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/