<div class="docbook"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix B. System Properties</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="Java-Broker-Appendix-Environment-Variables.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="Java-Broker-Appendix-Operation-Logging.html">Next</a></td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="Java-Broker-Appendix-System-Properties"></a>Appendix B. System Properties</h1></div></div></div><p>The following table describes the Java system properties used by the Broker to control
    various optional behaviours.</p><p>The preferred method of enabling these system properties is using the <a class="link" href="Java-Broker-Appendix-Environment-Variables.html#Java-Broker-Appendix-Environment-Variables-Qpid-Opts"><code class="literal">QPID_OPTS</code></a> environment variable described in the previous
    section.</p><div class="table"><a id="d0e10658"></a><p class="title"><strong>Table B.1. System properties</strong></p><div class="table-contents"><table summary="System properties" width="100%" border="1"><colgroup><col class="systemproperty" /><col class="default" /><col class="purpose" /></colgroup><thead><tr><th>System property</th><th>Default</th><th>Purpose</th></tr></thead><tbody><tr><td><a id="Java-Broker-Appendix-System-Properties-Broker-Heartbeat-Timeout-Factor"></a>qpid.broker_heartbeat_timeout_factor</td><td>2</td><td>Factor to determine the maximum length of that may elapse between heartbeats being
            received from the peer before a connection is deemed to have been broken.</td></tr><tr><td><a id="Java-Broker-Appendix-System-Properties-Broker-Status-Updates"></a>qpid.broker_status_updates</td><td>true</td><td>
            <p>If set true, the Broker will produce operational logging messages.</p>
          </td></tr><tr><td><a id="Java-Broker-Appendix-System-Properties-Broker-Disabled-Features"></a>qpid.broker_disabled_features</td><td>none</td><td>
            <p>Allows optional Broker features to be disabled. Currently understood feature
              names are: <code class="literal">qpid.jms-selector</code></p>
            <p>Feature names should be comma separated.</p>
          </td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="Java-Broker-Appendix-Environment-Variables.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="Java-Broker-Appendix-Operation-Logging.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Appendix A. Environment Variables </td><td width="20%" align="center"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td width="40%" align="right" valign="top"> Appendix C. Operational Logging</td></tr></table></div></div>