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1. Please explain RuntimeException in Java and where it should be used
I am following this great discussion at SO, titled: The case against checked exceptions , but I am unable to follow where exactly RuntimeException should be used and how it is different from normal Exceptions and its subclasses. Googling gave me a complex answer, that is, it should be used to deal with programming logic errors and should be thrown when no Exception should normally occur, such a...
2. Why does this error occur? :java.io.FileNotFoundException: /dir/myfile.txt (Too many open files)
I've written an application that runs flawlessly in windows, and throws this error on unix. Generally, I dont understand why I'm getting this error! I create a single file and .append text to it. After I've appended a couple thousand lines I got this error... Any insight would be appreciated. Nothing in the javadoc listed this (too many files open) error - http://java.sun.com/j2se/1.4.2/do... 
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 /*
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  * Copyright 1994-1999 Sun Microsystems, Inc.  All Rights Reserved.
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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  *
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  * This code is free software; you can redistribute it and/or modify it
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  * under the terms of the GNU General Public License version 2 only, as
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  * published by the Free Software Foundation.  Sun designates this
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  * particular file as subject to the "Classpath" exception as provided
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  * by Sun in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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package java.io;


Signals that an attempt to open the file denoted by a specified pathname has failed.

This exception will be thrown by the FileInputStream, FileOutputStream, and RandomAccessFile constructors when a file with the specified pathname does not exist. It will also be thrown by these constructors if the file does exist but for some reason is inaccessible, for example when an attempt is made to open a read-only file for writing.

Author(s):
unascribed
Since:
JDK1.0
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public class FileNotFoundException extends IOException {

    
Constructs a FileNotFoundException with null as its error detail message. 
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    public FileNotFoundException() {
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        super();
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    }

    
Constructs a FileNotFoundException with the specified detail message. The string s can be retrieved later by the java.lang.Throwable.getMessage() method of class java.lang.Throwable.

Parameters:
s the detail message.
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    public FileNotFoundException(String s) {
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        super(s);
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    }

    
Constructs a FileNotFoundException with a detail message consisting of the given pathname string followed by the given reason string. If the reason argument is null then it will be omitted. This private constructor is invoked only by native I/O methods.

Since:
1.2
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    private FileNotFoundException(String path, String reason) {
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        super(path + ((reason == null)
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                      ? ""
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                      : " (" + reason + ")"));
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    }
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