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In my unit tests I need to set the "workingDir" system property to Null.
But I can not do somesing like this, because It give me NullPointerException:
System.setProperty("workingDir", null);
How can I do it?
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You can't do it, as setProperty method throws NullPointerException if any of it's arguments is null.
To solve the "Cannot set property 'value' of null" error, make sure to insert the JS script tag at the bottom of the body. The JS script tag should be placed after the HTML elements have been declared.
Code Correctness: null Argument to equals()equals(null) will always be false. The program uses the equals() method to compare an object with null . This comparison will always return false, since the object is not null . (If the object is null , the program will throw a NullPointerException ).
You can't set a property to have an actual null value - you can only clear it, like this:
System.clearProperty("workingDir");
System.setProperty() is internally implemented using a Properties object, which in turn uses the good old Hashtable. Those hashtables never let you set a null value using theput() method, so it can't really be done that way. Jon Skeet's post has the solution.
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