In this example, line 6 will cause a null pointer exception because the variable actions has not been initialized.

在这个例子中，第6行将产生一个null指针异常，因为变量actions还没有初始化。

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The system level error includes syntactical error, null pointer exception, web service timeout, database connection timeout, and so on.

系统级错误包括语法错误、空指针异常、web服务超时、数据库连接超时等。

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It looks for cases where a code path will or could cause a null pointer exception, and it also looks for cases in which there is a redundant comparison to null.

它查找代码路径将会或者可能造成null指针异常的情况，它还查找对null的冗余比较的情况。

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