Java example source code file (exceptions.xml)
The exceptions.xml Java example source code<?xml version="1.0"?>
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<?xml-stylesheet type="text/xsl" href="./xdoc.xsl"?>
<document url="exceptions.html">
<properties>
<title>The Commons Math User Guide - Exceptions
</properties>
<body>
<section name="19 Exceptions">
<subsection name="19.1 Overview" href="overview">
Commons Math defines a set of exceptions in order to convey the
precise low-level cause of failure.
</subsection>
<subsection name="19.2 Unchecked Exceptions" href="unchecked">
<p>
Starting from version 3.0, all exceptions generated by the
Commons Math code are <em>unchecked (i.e. they inherit from
the standard <code>RuntimeException class).
The main rationale supporting this design decision is that the
exceptions generated in the library are not recoverable: They most
of the time result from bad input parameters or some failure due to
numerical problems.
A thorough discussion of the pros and cons of checked and unchecked
exceptions can be read in
<a href="http://www.mindview.net/Etc/Discussions/CheckedExceptions">
this post</a> by Bruce Eckel.
</p>
</subsection>
<subsection name="19.3 Hierarchies" href="hierarchies">
<p>
The exceptions defined by Commons Math follow the Java standard
hierarchies:
<ul>
<li>
<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalArgumentException.html">
<code>IllegalArgumentException:
A <a href="../apidocs/org/apache/commons/math3/exception/MathIllegalArgumentException.html">
<code>MathIllegalArgumentException is thrown when some input
parameter fails a precondition check.
</li>
<li>
<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html">
<code>IllegalStateException:
A <a href="../apidocs/org/apache/commons/math3/exception/MathIllegalStateException.html">
<code>MathIllegalStateException is thrown when some inconsistency
has been detected.
</li>
<li>
<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/MathArithmeticException.html">
<code>ArithmeticException:
A <a href="../apidocs/org/apache/commons/math3/exception/MathArithmeticException.html">
<code>MathArithmeticException is thrown when conditions such as
"division by zero" or "overflow" are encountered.
</li>
<li>
<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/MathUnsupportedOperationException.html">
<code>UnsupportedOperationException:
A <a href="../apidocs/org/apache/commons/math3/exception/MathUnsupportedOperationException.html">
<code>MathUnsupportedOperationException indicates that a feature
is missing or does not make sense in the given context.
</li>
</ul>
</p>
<p>
In all of the above exception hierarchies, several subclasses can
exist, each conveying a specific underlying cause of the problem.
</p>
</subsection>
<subsection name="19.4 Features" href="features">
<ul>
<li>Localization
<p>
The detailed error messages (i.e. the string returned by the
<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Throwable.html#getLocalizedMessage()">
getLocalizedMessage</a> method) can be localized.
However, besides the American/English default, French is the only language
for which a translation resource is available.
</p>
</li>
<li>Exception "context"
<p>
Every exception generated by Commons Math implements the
<a href="../apidocs/org/apache/commons/math3/exception/util/ExceptionContextProvider.html">
ExceptionContextProvider</a> interface. A call to the
<a href="../apidocs/org/apache/commons/math3/exception/util/ExceptionContextProvider.html#getContext()">
getContext</a> method will return the
<a href="../apidocs/org/apache/commons/math3/exception/util/ExceptionContext.html">
ExceptionContext</a> instance stored in the exception, which the
user can further customize by adding messages and/or any object.
</p>
</li>
</ul>
</subsection>
</section>
</body>
</document>
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