compact3

com.sun.management

Interface HotSpotDiagnosticMXBean

All Superinterfaces:

PlatformManagedObject

public interface HotSpotDiagnosticMXBean
extends PlatformManagedObject

Diagnostic management interface for the HotSpot Virtual Machine.

The diagnostic MBean is registered to the platform MBeanServer as are other platform MBeans.

The ObjectName for uniquely identifying the diagnostic MXBean within an MBeanServer is:

com.sun.management:type=HotSpotDiagnostic

.* It can be obtained by calling the PlatformManagedObject.getObjectName() method. All methods throw a NullPointerException if any input argument is null unless it's stated otherwise.

See Also:

ManagementFactory#getPlatformMXBeans(Class)

Method Summary

Modifier and Type	Method and Description
void	dumpHeap(String outputFile, boolean live) Dumps the heap to the outputFile file in the same format as the hprof heap dump.
List<VMOption>	getDiagnosticOptions() Returns a list of VMOption objects for all diagnostic options.
VMOption	getVMOption(String name) Returns a VMOption object for a VM option of the given name.
void	setVMOption(String name, String value) Sets a VM option of the given name to the specified value.

Methods inherited from interface java.lang.management.PlatformManagedObject

getObjectName

Method Detail

dumpHeap

void dumpHeap(String outputFile,
              boolean live)
       throws IOException

Dumps the heap to the outputFile file in the same format as the hprof heap dump.

If this method is called remotely from another process, the heap dump output is written to a file named outputFile on the machine where the target VM is running. If outputFile is a relative path, it is relative to the working directory where the target VM was started.

Parameters:

outputFile - the system-dependent filename

live - if true dump only live objects i.e. objects that are reachable from others

Throws:

IOException - if the outputFile cannot be created, opened, or written to.

UnsupportedOperationException - if this operation is not supported.

NullPointerException - if outputFile is null.

getDiagnosticOptions

List<VMOption> getDiagnosticOptions()

Returns a list of VMOption objects for all diagnostic options. A diagnostic option is a writeable VM option that can be set dynamically mainly for troubleshooting and diagnosis.

Returns:

a list of VMOption objects for all diagnostic options.

getVMOption

VMOption getVMOption(String name)

Returns a VMOption object for a VM option of the given name.

Returns:

a VMOption object for a VM option of the given name.

Throws:

NullPointerException - if name is null.

IllegalArgumentException - if a VM option of the given name does not exist.

setVMOption

void setVMOption(String name,
                 String value)

Sets a VM option of the given name to the specified value. The new value will be reflected in a new VMOption object returned by the getVMOption(java.lang.String) method or the getDiagnosticOptions() method. This method does not change the value of this VMOption object.

Parameters:

name - Name of a VM option

value - New value of the VM option to be set

Throws:

IllegalArgumentException - if the VM option of the given name does not exist.

IllegalArgumentException - if the new value is invalid.

IllegalArgumentException - if the VM option is not writeable.

NullPointerException - if name or value is null.

SecurityException - if a security manager exists and the caller does not have ManagementPermission("control").