io.quarkus.bootstrap.runner

Class RunnerClassLoader

java.lang.Object

java.lang.ClassLoader

io.quarkus.bootstrap.runner.RunnerClassLoader

public final class RunnerClassLoader
extends ClassLoader

Classloader used with the fast-jar package type. This ClassLoader takes advantage of the fact that Quarkus knows the entire classpath when the application is built, and thus can index the location of classes and resources (with the result being written during the build to a binary file and read at application startup). The advantage this has over the JDK's default System ClassLoader is that it knows which jars contain the requested classes and resources and thus does not have to iterate over all the jars on the classpath (which is slow and takes up heap space as the jars need to be kept open), but instead can go directly to the jar(s) containing the requested class or resource. The implementation also contains optimizations that allow the ClassLoader to keep a minimum number of jars open while also preventing the lookup of the entire classpath for missing resources in known directories (like META-INF/services).

Method Summary

Modifier and Type	Method and Description
void	close()
protected Class<?>	findClass(String moduleName, String name) This method is needed to make packages work correctly on JDK9+, as it will be called to load the package-info class.
protected URL	findResource(String name)
protected Enumeration<URL>	findResources(String name)
Class<?>	loadClass(String name)
Class<?>	loadClass(String name, boolean resolve)
void	resetInternalCaches()

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

loadClass

public Class<?> loadClass(String name,
                          boolean resolve)
                   throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

findResource

protected URL findResource(String name)

Overrides:

findResource in class ClassLoader

findResources

protected Enumeration<URL> findResources(String name)

Overrides:

findResources in class ClassLoader

findClass

protected Class<?> findClass(String moduleName,
                             String name)

This method is needed to make packages work correctly on JDK9+, as it will be called to load the package-info class.

Parameters:

moduleName -

name -

Returns:

close

public void close()

resetInternalCaches

public void resetInternalCaches()