How to throw RuntimeException cannot find symbol

Question

I m trying to throw an exception in my code like this   throw RuntimeException msg     But when I build in NetBeans I get this error   C      java 50  cannot find symbol symbol    method RuntimeException java lang String  location  class             throw RuntimeException msg   1 error   Do I need to import something   Am I misspelling it   I m sure I must be doing something dumb  -

User · Answer

An Exception is an Object like any other in Java   You need to use the new keyword to create a new Exception before you can throw it   throw new RuntimeException      Optionally you could also do the following   RuntimeException e   new RuntimeException    throw e    Both code snippets are equivalent   Link to the tutorials for completeness

User · Answer

throw new RuntimeException msg     unlike any other Exceptions I think RuntimeException is the only one that will not stall the program but it can still keep running and recover just print out a bunch of Exception lines  correct me if I am wrong

User · Answer

throw new RuntimeException msg      notice the  new  keyword

User · Answer

throw new RuntimeException msg    You need the new in there  It s creating an instance and throwing it  not calling a method

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Just for others  be sure it is new RuntimeException  not new RuntimeErrorException which needs error as an argument

User · Answer

using new keyword we always create a instance  new object  and throwing it   not called a method  throw new RuntimeException  Your Message     You need the new in there  It s creating an instance and throwing it  not calling a method   int no  new Scanner   nextInt         we crate an instance using new keyword and throwing it    using new keyword memory clean   because use and throw   new Handler   postDelayed new Runnable          Override     public void run                do your work here            1000

User · Answer

you will have to instantiate it before you throw it   throw new RuntimeException arg0     PS  Intrestingly enough the Netbeans IDE should have already pointed out that compile time error

User · Answer

You need to create the instance of the RuntimeException  using new the same way you would to create an instance of most other classes   throw new RuntimeException msg

User · Answer

As everyone else has said  instantiate the object before throwing it   Just wanted to add one bit  it s incredibly uncommon to throw a RuntimeException   It would be normal for code in the API to throw a subclass of this  but normally  application code would throw Exception  or something that extends Exception but not RuntimeException   And in retrospect  I missed adding the reason why you use Exception instead of RuntimeException   Jay  in the comment below  added in the useful bit   RuntimeException isn t a checked exception     The method signature doesn t have to declare that a RuntimeException may be thrown  Callers of that method aren t required to catch the exception  or acknowlege it in any way  Developers who try to later use your code won t anticipate this problem unless they look carefully  and it will increase the maintenance burden of the code

[java] How to throw RuntimeException ("cannot find symbol")

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