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How to converte String to Long?


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I have a String parameter "2012231211" and want to convert as Long data type for the SQL statement.

I had tried add a new parameter and set the default value expression as ($P{field}.matches("[0-9]+") ? new java.lang.Long($P{field}) : new java.lang.Long(0))

However, I got the following errors. "Error filling print... java.lang.String cannot be cast to java.lang.Long"

How can I convert the String to Long ? 

p.s I cannot set the parameter as Long data type. 

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