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<TITLE>Printing Security System Trace Messages (Java Developers Almanac Example)
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    <B><A HREF="../java.security/pkg.html">java.security</A></B><font color="#666666" class="xsmall-font">
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  <h3>e193. Printing Security System Trace Messages</h3>

By setting the system property <code>java.security.debug</code> to <code>all</code>,
the security system will print details of security related calls.  The
value <code>all</code> prints all available debugging information. For finer
control of what is printed, see:


<pre>    http://java.sun.com/j2se/1.4/docs/guide/plugin/developer_guide/debugger.html#jsdp
</pre>
Here's an example of setting the system property on the command line:

<pre>    java -Djava.security.debug=all <font color="#0066ff"><i>MyApp</i></font>

</pre>
Here's a sample of trace messages:

<pre>    access: access allowed (java.io.FilePermission c:\file1 read)
    access: access allowed (java.io.FilePermission c:\file2 write)
    access: access denied (java.util.PropertyPermission user.home read)
    Exception in thread "main" java.security.AccessControlException: access denied (
    java.util.PropertyPermission user.home read)
            at java.security.AccessControlContext.checkPermission(AccessControlContext.java:270)
            at java.security.AccessController.checkPermission(AccessController.java:401)
            at java.lang.SecurityManager.checkPermission(SecurityManager.java:542)
            at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1291)
            at java.lang.System.getProperty(System.java:572)
            at MyApp.main(MyApp.java:50)
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            &nbsp;<b>Related Examples</b></font></td>
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e194. <a class="eglink" href="ListServices.html?l=rel">
    Listing All Available Cryptographic Services
</a>
<br>

e195. <a class="eglink" href="ListSecureRnd.html?l=rel">
    Listing All Available Secure Random Number Generators
</a>
<br>

e196. <a class="eglink" href="CreateSecureRandom.html?l=rel">
    Generating a Secure Random Number
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.security/pkg.html?l=rel#Key%20Store">
    Key Store
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.security/pkg.html?l=rel#Message%20Digests">
    Message Digests
</a>&nbsp;&nbsp;

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

<a class="eglink" href="/egs/java.security/pkg.html?l=rel#Policy%20Files">
    Policy Files
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.security/pkg.html?l=rel#Public%20and%20Private%20Keys">
    Public and Private Keys
</a>&nbsp;&nbsp;

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

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