Java Utililty Methods RuntimeException Create

RuntimeException toRuntimeException(Exception e)
to Runtime Exception

return toRuntimeException(e, null);

RuntimeException toRuntimeException(Exception e)
Do never catch Throwables!

return e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);

RuntimeException toRuntimeException(Exception ex)
to Runtime Exception

if (ex instanceof RuntimeException) {
 return (RuntimeException) ex;
} else {
 return new RuntimeException(ex);

RuntimeException toRuntimeException(final Throwable e)
Creates a RuntimeException from the Throwable if it isn't already a RuntimeException

if (e == null) {
 return new NullPointerException("Problem without an Exception");
return e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);

RuntimeException toRuntimeException(Throwable e)
convert Throwable to RuntimeException

RuntimeException re = new RuntimeException(e);
re.setStackTrace(e.getStackTrace());
e.printStackTrace(System.err);
return re;

RuntimeException toRuntimeException(Throwable t)
Always returns a RuntimeException using this sequential logic:

1. if t == null, returns a new RuntimeException which has a null cause
2. else if t is an instanceof Error, returns a new RuntimeException which has t as its cause
3. else if t is an instanceof RuntimeException, returns t itself
4. else if t is an instanceof Exception, then it must be a checked Exception, so it returns a new RuntimeException which has t as its cause
5. else t is an actual Throwable instance (or some unknown subclass), so it returns a new RuntimeException which has t as its cause

This method is usually called to convert checked Exceptions into unchecked ones.

if (t == null)
 return new RuntimeException("This RuntimeException wraps a null cause");
else if (t instanceof Error)
 return new RuntimeException("This RuntimeException wraps an underlying Error (see cause)", t);
else if (t instanceof RuntimeException)
 return (RuntimeException) t;
else if (t instanceof Exception)
 return new RuntimeException("This RuntimeException wraps an underlying checked Exception (see cause)",
...

RuntimeException toRuntimeException(Throwable t)
to Runtime Exception

return new RuntimeException(t);

RuntimeException toRuntimeException(Throwable throwable)
to Runtime Exception

return throwable instanceof RuntimeException ? (RuntimeException) throwable
 : new RuntimeException(throwable);

RuntimeException toRuntimeException(Throwable throwable)
Converts the given throwable into a RuntimeException , if necessary, and returns it.

if (throwable instanceof Error)
 throw (Error) throwable;
return throwable instanceof RuntimeException ? (RuntimeException) throwable
 : new RuntimeException(throwable);

T toRuntimeExceptionOr(Class exClass, Throwable throwable)
Returns the given throwable if it is of the expected type and returns it, or converts it into a RuntimeException , if necessary, and throws it.

if (exClass.isAssignableFrom(throwable.getClass()))
 return (T) throwable;
if (throwable instanceof RuntimeException)
 throw (RuntimeException) throwable;
if (throwable instanceof Error)
 throw (Error) throwable;
throw new RuntimeException(throwable);