Java Utililty Methods RuntimeException Create

List of utility methods to do RuntimeException Create

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Description

The list of methods to do RuntimeException Create are organized into topic(s).

Method

RuntimeExceptiontoRuntimeException(Exception e)
to Runtime Exception 
return toRuntimeException(e, null);
RuntimeExceptiontoRuntimeException(Exception e)
Do never catch Throwables! 
return e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
RuntimeExceptiontoRuntimeException(Exception ex)
to Runtime Exception 
if (ex instanceof RuntimeException) {
    return (RuntimeException) ex;
} else {
    return new RuntimeException(ex);
RuntimeExceptiontoRuntimeException(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);
RuntimeExceptiontoRuntimeException(Throwable e)
convert Throwable to RuntimeException 
RuntimeException re = new RuntimeException(e);
re.setStackTrace(e.getStackTrace());
e.printStackTrace(System.err);
return re;
RuntimeExceptiontoRuntimeException(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)",
...
RuntimeExceptiontoRuntimeException(Throwable t)
to Runtime Exception 
return new RuntimeException(t);
RuntimeExceptiontoRuntimeException(Throwable throwable)
to Runtime Exception 
return throwable instanceof RuntimeException ? (RuntimeException) throwable
        : new RuntimeException(throwable);
RuntimeExceptiontoRuntimeException(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);
TtoRuntimeExceptionOr(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);