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After a lot of hours and help from berak I figured it out. Instead of using a Mat and using the push_back function. I made a 2d float array and put the descriptor output from the compute function in there.

//for loop each image
float[] vector = descriptors.toArray();
trainVector[i] = vector;

Afterwards I made an empty Mat and put the values of the float array in there. And used that for training. Also don't forget to put the rho at the end of the supportvectorfrom the svm.