java.lang.Object
- org.springframework.boot.loader.Launcher

Direct Known Subclasses:
ExecutableArchiveLauncher, PropertiesLauncher
```
public abstract class Launcher
extends Object
```
Base class for launchers that can start an application with a fully configured classpath backed by one or more Archives.

Constructor Summary
Constructors
Constructor Description
Launcher()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected Archive`	`createArchive()`
`protected ClassLoader`	`createClassLoader(URL[] urls)`	Create a classloader for the specified URLs.
`protected ClassLoader`	`createClassLoader(List<Archive> archives)`	Create a classloader for the specified archives.
`protected MainMethodRunner`	`createMainMethodRunner(String mainClass, String[] args, ClassLoader classLoader)`	Create the `MainMethodRunner` used to launch the application.
`protected abstract List<Archive>`	`getClassPathArchives()`	Returns the archives that will be used to construct the class path.
`protected abstract String`	`getMainClass()`	Returns the main class that should be launched.
`protected void`	`launch(String[] args)`	Launch the application.
`protected void`	`launch(String[] args, String mainClass, ClassLoader classLoader)`	Launch the application given the archive file and a fully configured classloader.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Launcher
```
public Launcher()
```
- Method Detail
  - launch
```
protected void launch(String[] args)
               throws Exception
```
    Launch the application. This method is the initial entry point that should be called by a subclass public static void main(String[] args) method.
    Parameters:
    args - the incoming arguments
    Throws:
    Exception - if the application fails to launch
  - createClassLoader
```
protected ClassLoader createClassLoader(List<Archive> archives)
                                 throws Exception
```
    Create a classloader for the specified archives.
    Parameters:
    archives - the archives
    Returns:
    the classloader
    Throws:
    Exception - if the classloader cannot be created
  - createClassLoader
```
protected ClassLoader createClassLoader(URL[] urls)
                                 throws Exception
```
    Create a classloader for the specified URLs.
    Parameters:
    urls - the URLs
    Returns:
    the classloader
    Throws:
    Exception - if the classloader cannot be created
  - launch
```
protected void launch(String[] args,
                      String mainClass,
                      ClassLoader classLoader)
               throws Exception
```
    Launch the application given the archive file and a fully configured classloader.
    Parameters:
    args - the incoming arguments
    mainClass - the main class to run
    classLoader - the classloader
    Throws:
    Exception - if the launch fails
  - createMainMethodRunner
```
protected MainMethodRunner createMainMethodRunner(String mainClass,
                                                  String[] args,
                                                  ClassLoader classLoader)
```
    Create the MainMethodRunner used to launch the application.
    Parameters:
    mainClass - the main class
    args - the incoming arguments
    classLoader - the classloader
    Returns:
    the main method runner
  - getMainClass
```
protected abstract String getMainClass()
                                throws Exception
```
    Returns the main class that should be launched.
    Returns:
    the name of the main class
    Throws:
    Exception - if the main class cannot be obtained
  - getClassPathArchives
```
protected abstract List<Archive> getClassPathArchives()
                                               throws Exception
```
    Returns the archives that will be used to construct the class path.
    Returns:
    the class path archives
    Throws:
    Exception - if the class path archives cannot be obtained
  - createArchive
```
protected final Archive createArchive()
                               throws Exception
```
    Throws:
    Exception

Class Launcher

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Launcher

Method Detail

launch

createClassLoader

createClassLoader

launch

createMainMethodRunner

getMainClass

getClassPathArchives

createArchive