How can I fix 'No exception of type SomeException can be thrown; an exception type must be a subclass of Throwable'

Question

I have java webstart app and want to use app API for testing purposes. So I get required (as I assumed) library from webserver and install it to maven repository. And all is fine except custom exception which received

No exception of type SomeException can be thrown; an exception type must be a subclass of Throwable

As I understand from similar topics - some jar library is missing, is there some way to know which one? or maybe there is other way to fix this? (of course I can install all jars which used for app, but there are over 90 jar's).

Let me emphasize **an exception type must be a subclass of `Throwable`**. — Sotirios Delimanolis, Dec 03 '14 at 16:42
Where is SomeException declared? Wherever it is, it's declared improperly. — Hot Licks, Dec 03 '14 at 16:45
@SotiriosDelimanolis, when dev's show me an example - they don't have such error, but that project depends from other projects for which I've no access. so I assume that it should be throwable. and I'm not strong in java:( — user3535807, Dec 03 '14 at 16:48
@HotLicks `try{ some code which thows someException}catch(SomeException e){}` — user3535807, Dec 03 '14 at 16:50
@HotLicks, just don't abuse me. do you mean `app.api.domain.exceptions.SomeException` ? — user3535807, Dec 03 '14 at 16:59
I mean the place where SomeException is *DECLARED*. SomeException is a class. Do you know how a class is declared? — Hot Licks, Dec 03 '14 at 17:01
Hint: It will probably start `public class SomeException ...` — Hot Licks, Dec 03 '14 at 17:02
@HotLicks, I don't know where it's declared. assume if I know that I'll just get required jar and don't ask about that. — user3535807, Dec 03 '14 at 17:17

score 3 · Answer 1 · answered Dec 03 '14 at 16:44

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If you want to define a custom exception, it MUST subclass Throwable; but in practice you'll never subclass this directly. Subclass either of:

Exception if you want to create a checked exception class;
RuntimeException if you want to create an unchecked exception class.

You may also want to subclass another exception already defined by the JDK, which defines a good number of exceptions which may fit what you want to "say" with your exception.

answered Dec 03 '14 at 16:44

fge

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Correct. The only way it could be a jar file problem is if SomeException sublasses SpecialEror, and in one jar file SpecialError subclasses Throwable (directly or indirectly) while in another jar file SpecialError does not subclass Throwable. – Hot Licks Dec 03 '14 at 16:47

score 2 · Accepted Answer · edited Jan 17 '19 at 11:38

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I used JadClipse Eclipse plug-in for decompiling my jar and found that my SomeException extends FaultInfoException (org.codehaus.xfire.fault.FaultInfoException),and then added xfire-all dependency to my pom.xml

edited Jan 17 '19 at 11:38

Augustine Samuel

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answered Dec 03 '14 at 18:59

user3535807

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score 0 · Answer 3 · edited Sep 01 '21 at 10:33

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You can resolve this by simply inheriting the exception class with a built-in Exception class. Wherever you have created the exception class just add extends Exception there.

edited Sep 01 '21 at 10:33

Mureinik

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answered Sep 01 '21 at 10:13

shweta tiwari

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How can I fix 'No exception of type SomeException can be thrown; an exception type must be a subclass of Throwable'

3 Answers3

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