Package net.bytebuddy.agent

Class Attacher

java.lang.Object

net.bytebuddy.agent.Attacher

public class Attacher
extends Object

A Java program that attaches a Java agent to an external process.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	ATTACH_METHOD_NAME	The name of the attach method of the VirtualMachine class.
private static final String	DETACH_METHOD_NAME	The name of the detach method of the VirtualMachine class.
private static final String	LOAD_AGENT_METHOD_NAME	The name of the loadAgent method of the VirtualMachine class.
private static final String	LOAD_AGENT_PATH_METHOD_NAME	The name of the loadAgentPath method of the VirtualMachine class.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Attacher()	The attacher provides only static utility methods and should not be instantiated.

Method Summary

Modifier and Type	Method	Description
protected static void	install(Class<?> virtualMachineType, String processId, String agent, boolean isNative, String argument)	Installs a Java agent on a target VM.
static void	main(String[] args)	Runs the attacher as a Java application.

Methods inherited from class java.lang.Object

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

Field Details

ATTACH_METHOD_NAME

private static final String ATTACH_METHOD_NAME

The name of the attach method of the VirtualMachine class.

See Also:

• Constant Field Values

LOAD_AGENT_METHOD_NAME

private static final String LOAD_AGENT_METHOD_NAME

The name of the loadAgent method of the VirtualMachine class.

See Also:

• Constant Field Values

LOAD_AGENT_PATH_METHOD_NAME

private static final String LOAD_AGENT_PATH_METHOD_NAME

The name of the loadAgentPath method of the VirtualMachine class.

See Also:

• Constant Field Values

DETACH_METHOD_NAME

private static final String DETACH_METHOD_NAME

The name of the detach method of the VirtualMachine class.

See Also:

• Constant Field Values

Constructor Details

Attacher

private Attacher()

The attacher provides only static utility methods and should not be instantiated.

Method Details

main

public static void main(String[] args)

Runs the attacher as a Java application.

Parameters:

args - A list containing the fully qualified name of the virtual machine type, the process id, the fully qualified name of the Java agent jar followed by an empty string if the argument to the agent is null or any number of strings where the first argument is proceeded by any single character which is stripped off.

install

protected static void install(Class<?> virtualMachineType,
 String processId,
 String agent,
 boolean isNative,
 @MaybeNull
 String argument)
                       throws NoSuchMethodException,
InvocationTargetException,
IllegalAccessException

Installs a Java agent on a target VM.

Parameters:

virtualMachineType - The virtual machine type to use for the external attachment.

processId - The id of the process being target of the external attachment.

agent - The Java agent to attach.

isNative - true if the agent is native.

argument - The argument to provide or null if no argument is provided.

Throws:

NoSuchMethodException - If the virtual machine type does not define an expected method.

InvocationTargetException - If the virtual machine type raises an error.

IllegalAccessException - If a method of the virtual machine type cannot be accessed.