Acer iconia选项卡A500 SipManager.isApiSupported返回false（不支持Voip api）(Acer iconia tab A500 SipManager.isApiSupported returns false (Voip api not supported))

 您的连接看起来不对，我不明白为什么您需要一个硬编码阵列。 也可以将实体别名直接放在select中。 我会把它写成： 
 
public function GetProductsList($productid){

    $result = $this->getEntityManager()->createQueryBuilder()
        ->select('product', 'category')
        ->from('TestMyBundle:product','product')
        ->join('product.categories','category') // making an assumption your product entity has getCategories()
        ->where('product.productid=:productid')
        ->setParameter('productid',$productid)
        ->getQuery()
        ->getResult();

    return $result;
}
 
 应该工作。 
 
 请注意，当你遇到这样的问题时，做一些像 - > getSQL（）而不是getQuery（）和var_dump这样的SQL来查看查询构建器产生的内容是很有用的，这使得调试更容易。 

Your join looks wrong and I don't see why you need an hardcoded array there. May as well just put the entity aliases directly in the select. I would write that as:
 
public function GetProductsList($productid){

    $result = $this->getEntityManager()->createQueryBuilder()
        ->select('product', 'category')
        ->from('TestMyBundle:product','product')
        ->join('product.categories','category') // making an assumption your product entity has getCategories()
        ->where('product.productid=:productid')
        ->setParameter('productid',$productid)
        ->getQuery()
        ->getResult();

    return $result;
}
 
Should work then.
 
Note that when you get problems like this it's useful to do something like ->getSQL() instead of getQuery() and var_dump the SQL to see what the querybuilder is producing, makes it easier to debug.