src/java.management/share/classes/javax/management/loading/package.html - master - githubmirror/jdk17u-dev

src/java.management/share/classes/javax/management/loading/package.html
74 строки3 KB
Jonathan Gibbons
8263104: fix warnings for empty paragraphs
06 мар 2021, 18:06
06 мар 2021, 18:067182985
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<head>
<title>javax.management.loading package</title>
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      <p>Provides the classes which implement advanced dynamic
	loading.  See the chapter <em>Advanced Dynamic Loading</em> in
	the <a href="#spec">JMX Specification</a>.</p>

      <p>An MBean that is of a subclass of {@link
	java.lang.ClassLoader} can be used as a class loader to create
	other MBeans via the method {@link
	javax.management.MBeanServer#createMBean(String, ObjectName,
	ObjectName, Object[], String[])}, and to instantiate arbitrary
	objects via the method {@link
	javax.management.MBeanServer#instantiate(String, ObjectName,
	Object[], String[])}.  The {@link
	javax.management.loading.MLet MLet} class is an example of
	such an MBean.  It is a {@link java.net.URLClassLoader
	URLClassLoader}, so the list of URLs to load classes from can
	be configured.</p>

      <p>Additionally, an <code>MLet</code> can read a configuration
	file that specifies a set of MBeans to be registered in the same
	MBean Server as the <code>MLet</code>.</p>

      <p>Every MBean Server has a <em>class loader repository</em>
	containing all MBeans registered in that MBean Server that
	are of a subclass of {@link java.lang.ClassLoader}.  The class
	loader repository is used by the forms of the
	<code>createMBean</code> and <code>instantiate</code> methods
	in the {@link javax.management.MBeanServer MBeanServer}
	interface that do not have an explicit loader parameter.  It
	is also used by the <code>MLet</code> class when it does not
	find a class in its own set of URLs.</p>

      <p>If an MBean implements the interface {@link
	javax.management.loading.PrivateClassLoader PrivateClassLoader},
	then it is not added to the class loader repository.  The class
	{@link javax.management.loading.PrivateMLet PrivateMLet} is a
	subclass of <code>MLet</code> that implements
	<code>PrivateClassLoader</code>.</p>

    @see <a id="spec" href="https://jcp.org/aboutJava/communityprocess/mrel/jsr160/index2.html">
      JMX Specification, version 1.4</a>

      @since 1.5
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