Source:
private void fireThrowCallback(final Invoker<?> invoker, final Invocation invocation, final Throwable exception) { final ConsumerMethodModel.AsyncMethodInfo asyncMethodInfo = getAsyncMethodInfo(invoker, invocation); if (asyncMethodInfo == null) return; final Method onthrowMethod = asyncMethodInfo.getOnthrowMethod(); final Object onthrowInst = asyncMethodInfo.getOnthrowInstance(); if (onthrowMethod == null && onthrowInst == null) { return; } if (onthrowMethod == null || onthrowInst == null) { throw new IllegalStateException("service:" + invoker.getUrl().getServiceKey() + " has a onthrow callback config , but no such " + (onthrowMethod == null ? "method" : "instance") + " found. url:" + invoker.getUrl()); } if (!onthrowMethod.isAccessible()) { onthrowMethod.setAccessible(true); } Class<?>[] rParaTypes = onthrowMethod.getParameterTypes(); if (rParaTypes[0].isAssignableFrom(exception.getClass())) { try { Object[] args = invocation.getArguments(); Object[] params; if (rParaTypes.length > 1) { if (rParaTypes.length == 2 && rParaTypes[1].isAssignableFrom(Object[].class)) { params = new Object[2]; params[0] = exception; params[1] = args; } else { params = new Object[args.length + 1]; params[0] = exception; System.arraycopy(args, 0, params, 1, args.length); } } else { params = new Object[]{exception}; } onthrowMethod.invoke(onthrowInst, params); } catch (Throwable e) { logger.error(invocation.getMethodName() + ".call back method invoke error . callback method :" + onthrowMethod + ", url:" + invoker.getUrl(), e); } } else { logger.error(invocation.getMethodName() + ".call back method invoke error . callback method :" + onthrowMethod + ", url:" + invoker.getUrl(), exception); } }

Target:
private void fireThrowCallback(final Invoker<?> invoker, final Invocation invocation, final Throwable exception) { final ConsumerMethodModel.AsyncMethodInfo asyncMethodInfo = getAsyncMethodInfo(invoker, invocation); if (asyncMethodInfo == null) { return; } final Method onthrowMethod = asyncMethodInfo.getOnthrowMethod(); final Object onthrowInst = asyncMethodInfo.getOnthrowInstance(); if (onthrowMethod == null && onthrowInst == null) { return; } if (onthrowMethod == null || onthrowInst == null) { throw new IllegalStateException("service:" + invoker.getUrl().getServiceKey() + " has a onthrow callback config , but no such " + (onthrowMethod == null ? "method" : "instance") + " found. url:" + invoker.getUrl()); } if (!onthrowMethod.isAccessible()) { onthrowMethod.setAccessible(true); } Class<?>[] rParaTypes = onthrowMethod.getParameterTypes(); if (rParaTypes[0].isAssignableFrom(exception.getClass())) { try { Object[] args = invocation.getArguments(); Object[] params; if (rParaTypes.length > 1) { if (rParaTypes.length == 2 && rParaTypes[1].isAssignableFrom(Object[].class)) { params = new Object[2]; params[0] = exception; params[1] = args; } else { params = new Object[args.length + 1]; params[0] = exception; System.arraycopy(args, 0, params, 1, args.length); } } else { params = new Object[]{exception}; } onthrowMethod.invoke(onthrowInst, params); } catch (Throwable e) { logger.error(invocation.getMethodName() + ".call back method invoke error . callback method :" + onthrowMethod + ", url:" + invoker.getUrl(), e); } } else { logger.error(invocation.getMethodName() + ".call back method invoke error . callback method :" + onthrowMethod + ", url:" + invoker.getUrl(), exception); } }