If a page action method invocation returns a non-null string value, Seam treats it as a navigation event.
如果页面动作方法调用返回一个非空字符串值，则Seam将其当作一个导航事件。
If you do not want to have the event source set the current correlation sphere ID, you should pass null in as the second parameter.
如果您不想让事件源设置当前相关性的sphereID，您应该将第二个参数设置为空。
They basically trap for null or empty values in the event that the user clicks the Search button without selecting valid options for both usage and configuration.
它将在用户没有为配方和用法选择有效的选项就单击Search按钮时跟踪null或空值。
This code is included in the code which handles the click event for the Invoke Service button and its purpose is to avoid a null pointer exception when the web service is invoked with an empty string.
它的目的是避免使用空子符串调用Web服务而出现空指针异常。
The general event horizon formula of black hole is given from null hypersurface equation.
从零曲面方程出发，导出了黑洞视界面的普遍公式。
The general event horizon formula of black hole is given from null hypersurface equation.
从零曲面方程出发，导出了黑洞视界面的普遍公式。
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