请教:struts2自带json插件报错Java . lang . nosuchmethodexception:com . bx . cloud . bs . VO . PS . psuser . get callbacks()请教:struts2自带json插件报错Java . lang . nosuchmethodexception:com . bx . cloud . bs . VO . PS . psuser . get callbacks()简介:报错信息如下:Java . lang . nullpointerexception at org . Apache . struts 2 . JSON . JSON writer . findbase accessor
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