assert_enableassert.html

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<TITLE>Enabling Assertions from the Command Line
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  <h3>
    e104.  
    Enabling Assertions from the Command Line</h3>

The command line options <code>-ea</code> and <code>-da</code> allow you to enable and
disable assertion in a package subtree or in a class.  Here are
several examples of the switches.


Enable assertions in all non-system classes:

<pre>
    java -ea <font color="#0066ff"><i>MyApp</i></font>

</pre>
Enable assertions in all classes in the unnamed package:

<pre>
    java -ea:... <font color="#0066ff"><i>MyApp</i></font>

</pre>
Enable assertions in all classes in a package subtree:

<pre>
    java -ea:<font color="#0066ff"><i>com.mycompany</i></font>... <font color="#0066ff"><i>MyApp</i></font>

</pre>
Enable assertions in a particular class:

<pre>
    java -ea:<font color="#0066ff"><i>com.mycompany.MyCompany</i></font> <font color="#0066ff"><i>MyApp</i></font>

</pre>
Disable assertions in all classes in a package subtree:

<pre>
    java -da:<font color="#0066ff"><i>com.mycompany</i></font>... <font color="#0066ff"><i>MyApp</i></font>

</pre>
Disable assertions in a particular class:

<pre>
    java -da:<font color="#0066ff"><i>com.mycompany.MyClass</i></font> <font color="#0066ff"><i>MyApp</i></font>

</pre>
Multiple assertion switches on the command line are processed
from left to right. Enable assertions in all classes in 
a package subtree except for one class:

<pre>
    java -ea:<font color="#0066ff"><i>com.mycompany</i></font>... -da:<font color="#0066ff"><i>com.mycompany.MyClass</i></font> <font color="#0066ff"><i>MyApp</i></font>

</pre>
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            &nbsp;Related Examples
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e103. <a class="eglink" href="assert_CompileAssert.html?l=rel">
    Compiling a Program with Assertions
</a>
<br>

e105. <a class="eglink" href="assert_AssertError.html?l=rel">
    Handling an Assertion Error
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        See also: 
<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Arrays">
    Arrays
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Classes">
    Classes
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Commands">
    Commands
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<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Numbers">
    Numbers
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Objects">
    Objects
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Strings">
    Strings
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#System%20Properties">
    System Properties
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.lang/pkg.html?l=rel#Threads">
    Threads
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