TROUBLESHOOTING: Servelet Exception during PPR, #1...#n

1，現象： 運行時錯誤，後臺出現空指針異常； 代碼沒有任何編譯錯誤，operationbinding返回的result是null。 前臺出現PPR錯誤，編號從1開始增加： Servelet Exception during PPR, #1 Servelet Exception during PPR, #2 Servelet Exception during PPR, #3 ... Servelet

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