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Grails 2.5.11 / Postgresql 10 , Upload Image and Display in GSP

Hi i am new to grails and postgresql and i am trying to make a form that stores user's data and i want to be able to upload multiply photos.

service:

Cars carInstance = new Cars()
carInstance.carimg = params.carimg.getBytes()


gsp:

<input type="file" id="carimg" name="carimg" multiple />


and i call a saveCar action in controller that save all the data user will input.

And i want to display the data with the image in a showCar gsp this way :

<img src="${createLink(controller: 'garage', action: 'getImage', params: ['id': Cars.id])}"/>


also the getImage action that get the image and pass it to gsp is this :

def getImage(){
def item = Cars.get(params.id.toLong())
byte imageInByte=item.carimg
response.contentType = 'image/png'
response.outputStream << imageInByte
response.outputStream.flush() }


In the gsp it appears a blank border with an image in left corner that means image not found probably.
If i convert binary data to string it displays the right photo name.
Any suggestions ? The problem is in the way i store the image or the way i try to display a binary data to image ?

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