Before Java 9, the extension and the application class loader are an instance of the java.net.URLClassLoader class. In Java 9, the classification of class loaders has changed, instead of an external class loader, we have the Platform class loader. The purpose of using Platform class loader is that classes loaded by the bootstrap class loader have all permissions by default.
In the below example, we can display all modules with classloaders.
Example
import static java.util.Objects.isNull;
public class Java9ClassLoaderTest {
public static void main(String args[]) {
ModuleLayer layer = ModuleLayer.boot();
layer.modules().forEach(module -> {
ClassLoader classLoader = module.getClassLoader();
String classLoaderName = isNull(classLoader) ? "bootstrap" : classLoader.getName();
System.out.println(classLoaderName + ": " + module.getName());
});
}
}输出
app: jdk.internal.ed platform: jdk.scripting.nashorn platform: java.compiler platform: java.security.jgss platform: jdk.plugin.dom bootstrap: jdk.net bootstrap: java.management app: jdk.jdeps platform: javafx.base app: jdk.editpad bootstrap: java.security.sasl platform: java.sql.rowset bootstrap: java.datatransfer app: jdk.compiler platform: java.scripting platform: jdk.naming.dns platform: jdk.crypto.mscapi bootstrap: java.xml platform: jdk.localedata platform: javafx.swing bootstrap: jdk.unsupported platform: jdk.plugin bootstrap: jdk.snmp bootstrap: jdk.naming.rmi app: jdk.internal.le platform: javafx.web platform: jdk.dynalink platform: jdk.accessibility bootstrap: java.rmi platform: jdk.jsobject platform: java.sql app: jdk.attach bootstrap: jdk.management.cmm platform: jdk.security.auth platform: java.xml.crypto bootstrap: jdk.jfr bootstrap: jdk.management.jfr platform: jdk.security.jgss app: jdk.packager.services bootstrap: java.base app: jdk.internal.opt bootstrap: java.prefs bootstrap: java.management.rmi platform: jdk.zipfs platform: java.jnlp app: jdk.packager platform: oracle.net app: jdk.jlink bootstrap: jdk.management.agent bootstrap: java.logging app: jdk.jdi app: jdk.jstatd platform: java.se app: jdk.javadoc platform: jdk.charsets platform: java.smartcardio app: jdk.jconsole bootstrap: jdk.sctp platform: javafx.graphics bootstrap: jdk.management.resource app: jdk.jdwp.agent app: jdk.internal.jvmstat platform: javafx.controls platform: jdk.crypto.cryptoki platform: javafx.media bootstrap: jdk.httpserver platform: oracle.desktop bootstrap: java.naming app: jdk.jshell app: jdk.jartool platform: jdk.deploy bootstrap: java.desktop platform: javafx.fxml bootstrap: java.instrument platform: jdk.crypto.ec bootstrap: jdk.management platform: jdk.xml.dom platform: jdk.javaws
