Null pointer access: The variable condition can only be null at this location。
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Null pointer access: The variable condition can only be null at this location。
报空指针错误，
问题主要原因在于没有初始化
例如：
StringBuffer condition = null;
condition.append("a");
此时就会报这种错误
修改方法：
StringBuffer condition = new StringBuffer();
condition.append("a");
此时就是正确的
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