在try/catch块中未捕获异常

Question

是否有任何原因导致try/catch块无法工作？

我在try catch块内的Magento2应用程序接口中调用了一个方法，但它没有捕获异常，执行停止，我看到了堆栈跟踪。

下面是我的代码：

        $productModel = $this->productRepository->getById( $pId );

        $debpt = "";
        try{
            $debpt = $productModel->getCustomAttribute('depart_num')->getValue();
        }
        catch(\Exception $ex){
            $debpt = $ex->getMessage();
        }

getValue()方法导致了异常，但是我的try/catch没有捕捉到它。

下面是堆栈跟踪：

( ! ) Fatal error: Uncaught Error: Call to a member function getValue() on null in /var/www/nwl/app/code/Raleigh/CustomReports/Controller/Report/Generate.php on line 118
( ! ) Error: Call to a member function getValue() on null in /var/www/nwl/app/code/Raleigh/CustomReports/Controller/Report/Generate.php on line 118
Call Stack
#   Time    Memory  Function    Location
1   0.0093  383800  {main}( )   .../index.php:0
2   1.2357  12558448    Magento\Framework\App\Bootstrap->run( ??? ) .../index.php:39
3   1.2362  12560232    Magento\Framework\App\Http->launch( )   .../Bootstrap.php:258
4   2.3292  22376480    Magento\Framework\App\FrontController\Interceptor->dispatch( ??? )  .../Http.php:135
5   2.3302  22464168    Magento\Framework\App\FrontController\Interceptor->___callPlugins( ???, ???, ??? )  .../Interceptor.php:26
6   2.3302  22467712    Infortis\Cgen\Plugin\Magento\Framework\App\FrontController->aroundDispatch( ???, ???, ??? ) .../Interceptor.php:142
7   2.3305  22469480    Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}( ??? )  .../FrontController.php:32
8   2.3305  22469856    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Interceptor.php:138
9   2.3313  22499968    Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch( ???, ???, ??? )  .../Chain.php:67
10  2.3314  22501304    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../BuiltinPlugin.php:68
11  2.3314  22501680    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
12  2.3315  22504744    Magento\PageCache\Model\App\FrontController\VarnishPlugin->aroundDispatch( ???, ???, ??? )  .../Chain.php:67
13  2.3315  22504744    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../VarnishPlugin.php:55
14  2.3315  22505120    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
15  2.3318  22517640    Magento\Framework\Module\Plugin\DbStatusValidator->aroundDispatch( ???, ???, ??? )  .../Chain.php:67
16  2.4050  22671616    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../DbStatusValidator.php:69
17  2.4050  22671992    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
18  2.4053  22677224    Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch( ???, ???, ??? )   .../Chain.php:67
19  2.4067  22697128    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../RequestPreprocessor.php:94
20  2.4067  22697504    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
21  2.4067  22697544    Magento\Framework\App\FrontController\Interceptor->___callParent( ???, ??? )    .../Chain.php:70
22  2.4067  22697544    Magento\Framework\App\FrontController\Interceptor->dispatch( ??? )  .../Interceptor.php:74
23  2.6148  27411640    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->dispatch( ??? )   .../FrontController.php:55
24  2.6158  27438408    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->___callPlugins( ???, ???, ??? )   .../Interceptor.php:26
25  2.6303  29018384    Magento\Tax\Model\App\Action\ContextPlugin->aroundDispatch( ???, ???, ??? ) .../Interceptor.php:142
26  2.6303  29018384    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->Magento\Framework\Interception\{closure}( ??? )   .../ContextPlugin.php:91
27  2.6303  29018760    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Interceptor.php:138
28  2.6367  30050392    Magento\Weee\Model\App\Action\ContextPlugin->aroundDispatch( ???, ???, ??? )    .../Chain.php:67
29  2.6367  30050392    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../ContextPlugin.php:112
30  2.6367  30050768    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
31  2.6368  30052808    Magento\Store\App\Action\Plugin\StoreCheck->aroundDispatch( ???, ???, ??? ) .../Chain.php:67
32  2.6368  30052808    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../StoreCheck.php:44
33  2.6368  30053184    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
34  2.6369  30055776    Magento\Customer\Model\App\Action\ContextPlugin->aroundDispatch( ???, ???, ??? )    .../Chain.php:67
35  2.6372  30081328    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../ContextPlugin.php:61
36  2.6372  30081704    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
37  2.6373  30085880    Magento\Store\App\Action\Plugin\Context->aroundDispatch( ???, ???, ??? )    .../Chain.php:67
38  2.6448  30193896    Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}( ??? )   .../Context.php:106
39  2.6448  30194272    Magento\Framework\Interception\Chain\Chain->invokeNext( ???, ???, ???, ???, ??? )   .../Chain.php:63
40  2.7299  30787752    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->___callParent( ???, ??? ) .../Chain.php:70
41  2.7299  30787752    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->dispatch( ??? )   .../Interceptor.php:74
42  2.7385  31511040    Raleigh\CustomReports\Controller\Report\Generate\Interceptor->execute( )    .../Action.php:102

我在这里不知道如何解决这个问题。API类没有任何方法来检查值以避免null错误，并且我的try/catch块就是不起作用。

有人知道为什么try/catch可能不起作用吗？

Answer 1

代码不是抛出Exception，而是抛出Error，这就是你无法捕获它的原因。

例如，您可以先检查$productModel->getCustomAttribute('depart_num')是否为null

if ($productModel->getCustomAttribute('depart_num') !== null) { // do your logic

或者，如果你正在使用PHP 7+ (我想你也是)，你可以修改你正在捕获的东西，因为现在是Errors are catchable

catch (\Error $e) {