Here you can find the source of toIOException(ExecutionException e)
public static IOException toIOException(ExecutionException e)
//package com.java2s; /**/* w w w . ja v a2 s .c om*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.*; import java.util.concurrent.ExecutionException; public class Main { public static IOException toIOException(ExecutionException e) { final Throwable cause = e.getCause(); return cause != null ? asIOException(cause) : new IOException(e); } public static IOException asIOException(Throwable t) { return t instanceof IOException ? (IOException) t : new IOException(t); } }