Modify Virtual disk size using VI Java API -

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i'm trying clone vm, , want change disk capacity. 

    int virtualdiskscount = 0;     virtualdisk virtualdisk = null;     (virtualdevice virtualdevice : virtualhardware.getdevice()) {         if (virtualdevice instanceof virtualdisk) {             virtualdiskscount++;             virtualdisk = (virtualdisk) virtualdevice;         }     }     if (virtualdiskscount == 1) {         virtualdeviceconfigspec discspec = new virtualdeviceconfigspec();         discspec.setoperation(virtualdeviceconfigspecoperation.edit);          virtualdisk.setcapacityinbytes(155500000000l);         virtualdisk.setcapacityinkb(155500000000000000l);           discspec.setdevice(virtualdisk);         return discspec;     }

the code throws exception : invalid operation device '0'. passed these parameters in clonevm_task , in reconfigurevm_task, same errors happens

how can change virtual disk capacity? using vsphere 5.5

i don't code in java, it's close enough c# me help. first off need disk info , pull out virtualdeviceconfigspec, change it, add attach disk. creating new spec setting properties. also, why setting size in bytes kb???

here java muster...

mydisk.setcapacityinkb(long.parselong(50)*1024*1024); virtualdeviceconfigspec vdconfigspec = new virtualdeviceconfigspec(); vdconfigspec.setdevice(mydisk); vdconfigspec.setoperation(virtualdeviceconfigspecoperation.edit); virtualmachineconfigspec vmconfigspec = new virtualmachineconfigspec(); vmconfigspec.setdevicechange(new virtualdeviceconfigspec[]{vdconfigspec}); task task = vm.reconfigvm_task(vmconfigspec);

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