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<div class="subTitle">org.apache.openejb.loader</div>
<h2 title="Class SystemInstance" class="title">Class SystemInstance</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>org.apache.openejb.loader.SystemInstance</li>
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<pre>public final class <span class="typeNameLabel">SystemInstance</span>
extends java.lang.Object</pre>
<div class="block">This class aims to be the one and only static in the entire SYSTEM
A static, singleton, instance of this class can be created with the <a href="../../../../org/apache/openejb/loader/SystemInstance.html#init-java.util.Properties-"><code>init(Properties)</code></a> method
It is assumed that only one singleton per classloader is possible in any given VM
Thus loading this instance in a classloader will mean there can only be one OpenEJB
instance for that classloader and all children classloaders.</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#ACTIVEMQ_CREATE_JMX_CONNECTOR">ACTIVEMQ_CREATE_JMX_CONNECTOR</a></span></code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#addObserver-java.lang.Object-">addObserver</a></span>(java.lang.Object&nbsp;observer)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#currentProfile--">currentProfile</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>&lt;E&gt;&nbsp;E</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#fireEvent-E-">fireEvent</a></span>(E&nbsp;event)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/openejb/loader/SystemInstance.html" title="class in org.apache.openejb.loader">SystemInstance</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#get--">get</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/openejb/loader/FileUtils.html" title="class in org.apache.openejb.loader">FileUtils</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getBase--">getBase</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>java.lang.ClassLoader</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getClassLoader--">getClassLoader</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/openejb/loader/ClassPath.html" title="interface in org.apache.openejb.loader">ClassPath</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getClassPath--">getClassPath</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getComponent-java.lang.Class-">getComponent</a></span>(java.lang.Class&lt;T&gt;&nbsp;type)</code>
<div class="block">I'm not sure how this will play out, but I've used class instances instead of strings
for lookups as class instances are classloader scoped and there is an implicit "namespace"
associated with that.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>java.io.File</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getConf-java.lang.String-">getConf</a></span>(java.lang.String&nbsp;subPath)</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/openejb/loader/FileUtils.html" title="class in org.apache.openejb.loader">FileUtils</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getHome--">getHome</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/openejb/loader/Options.html" title="class in org.apache.openejb.loader">Options</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getOptions--">getOptions</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>java.util.Properties</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getProperties--">getProperties</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getProperty-java.lang.String-">getProperty</a></span>(java.lang.String&nbsp;key)</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getProperty-java.lang.String-java.lang.String-">getProperty</a></span>(java.lang.String&nbsp;key,
java.lang.String&nbsp;defaultValue)</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#getStartTime--">getStartTime</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#hasProperty-java.lang.String-">hasProperty</a></span>(java.lang.String&nbsp;propName)</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#init-java.util.Properties-">init</a></span>(java.util.Properties&nbsp;properties)</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#isDefaultProfile--">isDefaultProfile</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#isInitialized--">isInitialized</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#removeComponent-java.lang.Class-">removeComponent</a></span>(java.lang.Class&lt;T&gt;&nbsp;type)</code>&nbsp;</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#removeObserver-java.lang.Object-">removeObserver</a></span>(java.lang.Object&nbsp;observer)</code>&nbsp;</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#removeObservers--">removeObservers</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#reset--">reset</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#setComponent-java.lang.Class-T-">setComponent</a></span>(java.lang.Class&lt;T&gt;&nbsp;type,
T&nbsp;value)</code>&nbsp;</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#setProperty-java.lang.String-java.lang.String-">setProperty</a></span>(java.lang.String&nbsp;key,
java.lang.String&nbsp;value)</code>&nbsp;</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/openejb/loader/SystemInstance.html#setProperty-java.lang.String-java.lang.String-boolean-">setProperty</a></span>(java.lang.String&nbsp;key,
java.lang.String&nbsp;value,
boolean&nbsp;isExternalProperty)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h3>Field Detail</h3>
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<h4>ACTIVEMQ_CREATE_JMX_CONNECTOR</h4>
<pre>public static final&nbsp;java.lang.String ACTIVEMQ_CREATE_JMX_CONNECTOR</pre>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.apache.openejb.loader.SystemInstance.ACTIVEMQ_CREATE_JMX_CONNECTOR">Constant Field Values</a></dd>
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<pre>public&nbsp;&lt;E&gt;&nbsp;E&nbsp;fireEvent(E&nbsp;event)</pre>
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<pre>public&nbsp;boolean&nbsp;addObserver(java.lang.Object&nbsp;observer)</pre>
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<pre>public&nbsp;boolean&nbsp;removeObserver(java.lang.Object&nbsp;observer)</pre>
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<pre>public&nbsp;long&nbsp;getStartTime()</pre>
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<pre>public&nbsp;<a href="../../../../org/apache/openejb/loader/Options.html" title="class in org.apache.openejb.loader">Options</a>&nbsp;getOptions()</pre>
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<pre>public&nbsp;java.util.Properties&nbsp;getProperties()</pre>
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<pre>public&nbsp;java.lang.String&nbsp;getProperty(java.lang.String&nbsp;key)</pre>
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<pre>public&nbsp;java.lang.String&nbsp;getProperty(java.lang.String&nbsp;key,
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<pre>public&nbsp;java.lang.Object&nbsp;setProperty(java.lang.String&nbsp;key,
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<pre>public&nbsp;java.lang.Object&nbsp;setProperty(java.lang.String&nbsp;key,
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boolean&nbsp;isExternalProperty)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - property name</dd>
<dd><code>value</code> - property value</dd>
<dd><code>isExternalProperty</code> - should the property be set to System by <code>System.setProperty(String, String)</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>property value</dd>
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<h4>getHome</h4>
<pre>public&nbsp;<a href="../../../../org/apache/openejb/loader/FileUtils.html" title="class in org.apache.openejb.loader">FileUtils</a>&nbsp;getHome()</pre>
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<pre>public&nbsp;<a href="../../../../org/apache/openejb/loader/FileUtils.html" title="class in org.apache.openejb.loader">FileUtils</a>&nbsp;getBase()</pre>
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<a name="getClassPath--">
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<h4>getClassPath</h4>
<pre>public&nbsp;<a href="../../../../org/apache/openejb/loader/ClassPath.html" title="interface in org.apache.openejb.loader">ClassPath</a>&nbsp;getClassPath()</pre>
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<pre>public&nbsp;java.lang.ClassLoader&nbsp;getClassLoader()</pre>
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<h4>getComponent</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;T&nbsp;getComponent(java.lang.Class&lt;T&gt;&nbsp;type)</pre>
<div class="block">I'm not sure how this will play out, but I've used class instances instead of strings
for lookups as class instances are classloader scoped and there is an implicit "namespace"
associated with that. Theoretically, you can't lookup things that you can't already see
in your classloader.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - Class</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the object associated with the class type or null</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalStateException</code> - of the component isn't found</dd>
</dl>
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<a name="removeComponent-java.lang.Class-">
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<h4>removeComponent</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;T&nbsp;removeComponent(java.lang.Class&lt;T&gt;&nbsp;type)</pre>
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<a name="setComponent-java.lang.Class-java.lang.Object-">
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<h4>setComponent</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;T&nbsp;setComponent(java.lang.Class&lt;T&gt;&nbsp;type,
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - the class type of the component required</dd>
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<pre>public static&nbsp;void&nbsp;reset()</pre>
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<h4>init</h4>
<pre>public static&nbsp;void&nbsp;init(java.util.Properties&nbsp;properties)
throws java.lang.Exception</pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
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<pre>public static&nbsp;<a href="../../../../org/apache/openejb/loader/SystemInstance.html" title="class in org.apache.openejb.loader">SystemInstance</a>&nbsp;get()</pre>
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