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jdk.jdi (Java SE 19 & JDK 19)

module jdk.jdi

Defines the Java Debug Interface.

The Java Debug Interface (JDI) is a high level Java API providing information useful for debuggers and similar systems needing access to the running state of a (usually remote) virtual machine.

JDI provides introspective access to a running virtual machine's state, Class, Array, Interface, and primitive types, and instances of those types.

JDI also provides explicit control over a virtual machine's execution. The ability to suspend and resume threads, and to set breakpoints, watchpoints, etc. Notification of exceptions, class loading, thread creation, etc. The ability to inspect a suspended thread's state, local variables, stack backtrace, etc.

JDI is the highest-layer of the Java Platform Debugger Architecture (JPDA).

This module includes a simple command-line debugger, jdb.

This section documents exceptions which apply to the entire API and are thus not documented on individual methods.

VMMismatchException

Any method on a Mirror that takes a Mirror as an parameter directly or indirectly (e.g., as a element in a List) will throw VMMismatchException if the mirrors are from different virtual machines.

NullPointerException

Any method which takes a Object as an parameter will throw NullPointerException if null is passed directly or indirectly -- unless null is explicitly mentioned as a valid parameter.

NOTE: The exceptions below may be thrown whenever the specified conditions are met but a guarantee that they are thrown only exists when a valid result cannot be returned.

VMDisconnectedException

Any method on ObjectReference, ReferenceType, EventRequest, StackFrame, or VirtualMachine or which takes one of these directly or indirectly as an parameter may throw VMDisconnectedException if the target VM is disconnected and the VMDisconnectEvent has been or is available to be read from the EventQueue.

VMOutOfMemoryException

Any method on ObjectReference, ReferenceType, EventRequest, StackFrame, or VirtualMachine or which takes one of these directly or indirectly as an parameter may throw VMOutOfMemoryException if the target VM has run out of memory.

ObjectCollectedException

Any method on ObjectReference or which directly or indirectly takes ObjectReference as parameter may throw ObjectCollectedException if the mirrored object has been garbage collected.

Any method on ReferenceType or which directly or indirectly takes ReferenceType as parameter may throw ObjectCollectedException if the mirrored type has been unloaded.

Module Graph:

Tool Guides:

jdb

Since:

9

See Also:

• Java Platform Debugger Architecture (JPDA)

• Packages

  Exports

  This is the core package of the Java Debug Interface (JDI), it defines mirrors for values, types, and the target VirtualMachine itself - as well bootstrapping facilities.

  This package defines connections between the virtual machine using the JDI and the target virtual machine.

  This package comprises the interfaces and classes used to develop new

  TransportService

  implementations.

  This package defines JDI events and event processing.

  This package is used to request that a JDI event be sent under specified conditions.

• Services

  Provides

  A method of connection between a debugger and a target VM.

  Uses

  A method of connection between a debugger and a target VM.

  A transport service for connections between a debugger and a target VM.

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For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples. Other versions.
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