Package org.apache.tools.ant.taskdefs.modules

Class Link

java.lang.Object

org.apache.tools.ant.ProjectComponent

org.apache.tools.ant.Task

org.apache.tools.ant.taskdefs.modules.Link

All Implemented Interfaces:

Cloneable

public class Link
extends Task

Assembles jmod files into an executable image. Equivalent to the JDK jlink command.

Supported attributes:

destDir

Root directory of created image. (required)

modulePath

Path of modules. Should be a list of .jmod files. Required, unless nested module path or modulepathref is present.

modulePathRef

Reference to path of modules. Referenced path should be a list of .jmod files.

modules

Comma-separated list of modules to assemble. Required, unless one or more nested <module> elements are present.

observableModules

Comma-separated list of explicit modules that comprise "universe" visible to tool while linking.

launchers

Comma-separated list of commands, each of the form name=module or name=module/mainclass

excludeFiles

Comma-separated list of patterns specifying files to exclude from linked image. Each is either a standard PathMatcher pattern or @filename.

excludeResources

Comma-separated list of patterns specifying resources to exclude from jmods. Each is either a standard PathMatcher pattern or @filename.

locales

Comma-separated list of extra locales to include, requires jdk.localedata module

resourceOrder

Comma-separated list of patterns specifying resource search order. Each is either a standard PathMatcher pattern or @filename.

bindServices

boolean, whether to link service providers; default is false

ignoreSigning

boolean, whether to allow signed jar files; default is false

includeHeaders

boolean, whether to include header files; default is true

includeManPages

boolean, whether to include man pages; default is true

includeNativeCommands

boolean, whether to include native executables normally generated for image; default is true

debug

boolean, whether to include debug information; default is true

verboseLevel

If set, jlink will produce verbose output, which will be logged at the specified Ant log level (DEBUG, VERBOSE, INFO}, WARN, or ERR).

compress

compression level, one of:

0

none

no compression (default)

1

strings

constant string sharing

2

zip

zip compression

endianness

Must be little or big, default is native endianness

checkDuplicateLegal

Boolean. When merging legal notices from different modules because they have the same name, verify that their contents are identical. Default is false, which means any license files with the same name are assumed to have the same content, and no checking is done.

vmType

Hotspot VM in image, one of:

• client
• server
• minimal
• all (default)

Supported nested elements

<modulepath>

path element

<module>

May be specified multiple times. Only attribute is required name attribute.

<observableModule>

May be specified multiple times. Only attribute is required name attribute.

<launcher>

May be specified multiple times. Attributes:

• name (required)
• module (required)
• mainClass (optional)

<locale>

May be specified multiple times. Only attribute is required name attribute.

<resourceOrder>

Explicit resource search order in image. May be specified multiple times. Exactly one of these attributes must be specified:

pattern

A standard PathMatcher pattern

listFile

Text file containing list of resource names (not patterns), one per line

If the resourceOrder attribute is also present on the task, its patterns are treated as if they occur before patterns in nested <resourceOrder> elements.

<excludeFiles>

Excludes files from linked image tree. May be specified multiple times. Exactly one of these attributes is required:

pattern

A standard PathMatcher pattern

listFile

Text file containing list of file names (not patterns), one per line

<excludeResources>

Excludes resources from jmods. May be specified multiple times. Exactly one of these attributes is required:

pattern

A standard PathMatcher pattern

listFile

Text file containing list of resource names (not patterns), one per line

<compress>

Must have level attribute, whose permitted values are the same as the compress task attribute described above. May also have a files attribute, which is a comma-separated list of patterns, and/or nested <files> elements, each with either a pattern attribute or listFile attribute.

<releaseInfo>

Replaces, augments, or trims the image's release info properties. This may specify any of the following:

• A file attribute, pointing to a Java properties file containing new release info properties that will entirely replace the current ones.
• A delete attribute, containing comma-separated property keys to remove from application's release info, and/or any number of nested <delete> elements, each with a required key attribute.
• One or more nested <add> elements, containing either key and value attributes, or a file attribute and an optional charset attribute.

Since:

1.10.6

See Also:

• jlink tool reference

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Link.Compression	Child element fully describing compression of a linked image.
static class	Link.CompressionLevel	Possible attribute values for compression level of a linked image: 0 none no compression (default) 1 strings constant string sharing 2 zip zip compression
static class	Link.Endianness	Possible values for linked image endianness: little and big.
class	Link.Launcher	Child element representing a custom launcher command in a linked image.
class	Link.LocaleSpec	Child element that contains a pattern matching Java locales.
class	Link.ModuleSpec	Child element that explicitly names a Java module.
class	Link.PatternListEntry	Child element type which specifies a jlink files pattern.
class	Link.ReleaseInfo	Child element describing changes to the default release properties of a linked image.
class	Link.ReleaseInfoEntry	Grandchild element describing additional release info properties for a linked image.
class	Link.ReleaseInfoKey	Grandchild element representing deletable key in a linked image's release properties.
static class	Link.VMType	Possible values for JVM type in linked image: client, server, minimal, or all.

Field Summary

Fields inherited from class org.apache.tools.ant.Task

target, taskName, taskType, wrapper

Fields inherited from class org.apache.tools.ant.ProjectComponent

description, location, project

Constructor Summary

Constructors

Constructor	Description
Link()

Method Summary

Modifier and Type	Method	Description
Link.Compression	createCompress()	Creates child <compress> element that specifies the level of compression the linker will apply, and optionally, which files in the image will be compressed.
Link.PatternListEntry	createExcludeFiles()	Creates child <excludeFiles> element that specifies files to exclude from linked modules when assembling linked image.
Link.PatternListEntry	createExcludeResources()	Creates child <excludeResources> element that specifies resources in linked modules that will be excluded from linked image.
Link.Launcher	createLauncher()	Creates child <launcher> element that can contain information on additional executable in the linked image.
Link.LocaleSpec	createLocale()	Creates child <locale> element that specifies a Java locale, or set of locales, to include from the jdk.localedata module in the linked image.
Link.ModuleSpec	createModule()	Adds child <module> element, specifying a module to link.
Path	createModulePath()	Adds child <modulePath> element.
Link.ModuleSpec	createObservableModule()	Creates child <observableModule> element that represents one of the modules the linker is permitted to know about.
Link.ReleaseInfo	createReleaseInfo()	Creates child <releaseInfo> element that modifies the default release properties of the linked image.
Link.PatternListEntry	createResourceOrder()	Creates child <resourceOrder element that specifies explicit ordering of resources in linked image.
void	execute()	Invokes the jlink tool to create a new linked image, unless the output directory exists and all of its files are files are newer than all files in the module path.
boolean	getBindServices()	Attribute indicating whether linked image should pull in providers in the module path of services used by explicitly linked modules.
boolean	getCheckDuplicateLegal()	Attribute indicating whether linker should check legal notices with duplicate names, and refuse to merge them (usually using symbolic links) if their respective content is not identical.
Link.CompressionLevel	getCompress()	Attribute indicating level of compression linker will apply to image.
boolean	getDebug()	Attribute indicating whether linker should keep or strip debug information in classes.
File	getDestDir()	Required attribute containing directory where linked image will be created.
Link.Endianness	getEndianness()	Attribute which indicates whether certain files in the linked image will be big-endian or little-endian.
boolean	getIgnoreSigning()	Attribute indicating whether linker should allow modules made from signed jars.
boolean	getIncludeHeaders()	Attribute indicating whether to include header files from linked modules in image.
boolean	getIncludeManPages()	Attribute indicating whether to include man pages from linked modules in image.
boolean	getIncludeNativeCommands()	Attribute indicating whether to include generated native commands, and native commands from linked modules, in image.
Path	getModulePath()	Attribute containing path of directories containing linkable modules.
LogLevel	getVerboseLevel()	Attribute indicating whether linker should produce verbose output, and at what logging level that output should be shown.
Link.VMType	getVmType()	Attribute indicating what type of JVM the linked image should have.
void	setBindServices(boolean bind)	Sets attribute indicating whether linked image should pull in providers in the module path of services used by explicitly linked modules.
void	setCheckDuplicateLegal(boolean check)	Sets attribute indicating whether linker should check legal notices with duplicate names, and refuse to merge them (usually using symbolic links) if their respective content is not identical.
void	setCompress(Link.CompressionLevel level)	Sets attribute indicating level of compression linker will apply to image.
void	setDebug(boolean debug)	Sets attribute indicating whether linker should keep or strip debug information in classes.
void	setDestDir(File dir)	Sets attribute indicating directory where linked image will be created.
void	setEndianness(Link.Endianness endianness)	Sets attribute which indicates whether certain files in the linked image will be big-endian or little-endian.
void	setExcludeFiles(String patternList)	Sets attribute containing a list of patterns denoting files to exclude from linked modules when assembling linked image.
void	setExcludeResources(String patternList)	Sets attribute containing a list of patterns denoting resources to exclude from linked modules in linked image.
void	setIgnoreSigning(boolean ignore)	Sets attribute indicating whether linker should allow modules made from signed jars.
void	setIncludeHeaders(boolean include)	Sets attribute indicating whether to include header files from linked modules in image.
void	setIncludeManPages(boolean include)	Sets attribute indicating whether to include man pages from linked modules in image.
void	setIncludeNativeCommands(boolean include)	Sets attribute indicating whether to include generated native commands, and native commands from linked modules, in image.
void	setLaunchers(String launcherList)	Sets attribute containing comma-separated list of information needed for additional executables in the linked image.
void	setLocales(String localeList)	Sets attribute containing a list of locale patterns, to specify Java locales to include from jdk.localedata module in linked image.
void	setModulePath(Path path)	Sets attribute containing path of directories containing linkable modules.
void	setModulePathRef(Reference ref)	Sets module path as a reference.
void	setModules(String moduleList)	Sets attribute containing list of modules to link.
void	setObservableModules(String moduleList)	Sets attribute containing modules linker is permitted to know about.
void	setResourceOrder(String patternList)	Sets attribute containing a list of patterns that explicitly order resources in the linked image.
void	setVerboseLevel(LogLevel level)	Sets attribute indicating whether linker should produce verbose output, and at what logging level that output should be shown.
void	setVmType(Link.VMType type)	Set attribute indicating what type of JVM the linked image should have.

Methods inherited from class org.apache.tools.ant.Task

bindToOwner, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, log, log, maybeConfigure, perform, reconfigure, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType

Methods inherited from class org.apache.tools.ant.ProjectComponent

clone, getDescription, getLocation, getProject, setDescription, setLocation, setProject

Methods inherited from class java.lang.Object

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

Constructor Details

Link

public Link()

Method Details

createModulePath

public Path createModulePath()

Adds child <modulePath> element.

Returns:

new, empty child element

See Also:

• setModulePath(Path)

getModulePath

public Path getModulePath()

Attribute containing path of directories containing linkable modules.

Returns:

current module path, possibly null

See Also:

• setModulePath(Path)
• createModulePath()

setModulePath

public void setModulePath(Path path)

Sets attribute containing path of directories containing linkable modules.

Parameters:

path - new module path

See Also:

• getModulePath()
• setModulePathRef(Reference)
• createModulePath()

setModulePathRef

public void setModulePathRef(Reference ref)

Sets module path as a reference.

Parameters:

ref - path reference

See Also:

• setModulePath(Path)
• createModulePath()

createModule

public Link.ModuleSpec createModule()

Adds child <module> element, specifying a module to link.

Returns:

new, unconfigured child element

See Also:

• setModules(String)

setModules

public void setModules(String moduleList)

Sets attribute containing list of modules to link.

Parameters:

moduleList - comma-separated list of module names

createObservableModule

public Link.ModuleSpec createObservableModule()

Creates child <observableModule> element that represents one of the modules the linker is permitted to know about.

Returns:

new, unconfigured child element

setObservableModules

public void setObservableModules(String moduleList)

Sets attribute containing modules linker is permitted to know about.

Parameters:

moduleList - comma-separated list of module names

createLauncher

public Link.Launcher createLauncher()

Creates child <launcher> element that can contain information on additional executable in the linked image.

Returns:

new, unconfigured child element

See Also:

• setLaunchers(String)

setLaunchers

public void setLaunchers(String launcherList)

Sets attribute containing comma-separated list of information needed for additional executables in the linked image. Each item must be of the form * name=module or name=module/mainclass.

Parameters:

launcherList - comma-separated list of launcher data

createLocale

public Link.LocaleSpec createLocale()

Creates child <locale> element that specifies a Java locale, or set of locales, to include from the jdk.localedata module in the linked image.

Returns:

new, unconfigured child element

setLocales

public void setLocales(String localeList)

Sets attribute containing a list of locale patterns, to specify Java locales to include from jdk.localedata module in linked image. Asterisks (*) are permitted for wildcard matches.

Parameters:

localeList - comma-separated list of locale patterns

createExcludeFiles

public Link.PatternListEntry createExcludeFiles()

Creates child <excludeFiles> element that specifies files to exclude from linked modules when assembling linked image.

Returns:

new, unconfigured child element

See Also:

• setExcludeFiles(String)

setExcludeFiles

public void setExcludeFiles(String patternList)

Sets attribute containing a list of patterns denoting files to exclude from linked modules when assembling linked image.

Parameters:

patternList - comman-separated list of patterns

See Also:

• Link.PatternListEntry

createExcludeResources

public Link.PatternListEntry createExcludeResources()

Creates child <excludeResources> element that specifies resources in linked modules that will be excluded from linked image.

Returns:

new, unconfigured child element

See Also:

• setExcludeResources(String)

setExcludeResources

public void setExcludeResources(String patternList)

Sets attribute containing a list of patterns denoting resources to exclude from linked modules in linked image.

Parameters:

patternList - comma-separated list of patterns

See Also:

• createExcludeResources()
• Link.PatternListEntry

createResourceOrder

public Link.PatternListEntry createResourceOrder()

Creates child <resourceOrder element that specifies explicit ordering of resources in linked image.

Returns:

new, unconfigured child element

See Also:

• setResourceOrder(String)

setResourceOrder

public void setResourceOrder(String patternList)

Sets attribute containing a list of patterns that explicitly order resources in the linked image. Any patterns specified here will be placed before any patterns specified as child elements.

Parameters:

patternList - comma-separated list of patterns

See Also:

• createResourceOrder()
• Link.PatternListEntry

getBindServices

public boolean getBindServices()

Attribute indicating whether linked image should pull in providers in the module path of services used by explicitly linked modules.

Returns:

true if linked will pull in service provides, false if not

See Also:

• setBindServices(boolean)

setBindServices

public void setBindServices(boolean bind)

Sets attribute indicating whether linked image should pull in providers in the module path of services used by explicitly linked modules.

Parameters:

bind - whether to include service providers

See Also:

• getBindServices()

getIgnoreSigning

public boolean getIgnoreSigning()

Attribute indicating whether linker should allow modules made from signed jars.

Returns:

true if signed jars are allowed, false if modules based on signed jars cause an error

See Also:

• setIgnoreSigning(boolean)

setIgnoreSigning

public void setIgnoreSigning(boolean ignore)

Sets attribute indicating whether linker should allow modules made from signed jars.

Note: As of Java 11, this attribute is internally forced to true. See the source.

Parameters:

ignore - true to have linker allow signed jars, false to have linker emit an error for signed jars

See Also:

• getIgnoreSigning()

getIncludeHeaders

public boolean getIncludeHeaders()

Attribute indicating whether to include header files from linked modules in image.

Returns:

true if header files should be included, false to exclude them

See Also:

• setIncludeHeaders(boolean)

setIncludeHeaders

public void setIncludeHeaders(boolean include)

Sets attribute indicating whether to include header files from linked modules in image.

Parameters:

include - true if header files should be included, false to exclude them

See Also:

• getIncludeHeaders()

getIncludeManPages

public boolean getIncludeManPages()

Attribute indicating whether to include man pages from linked modules in image.

Returns:

true if man pages should be included, false to exclude them

See Also:

• setIncludeManPages(boolean)

setIncludeManPages

public void setIncludeManPages(boolean include)

Sets attribute indicating whether to include man pages from linked modules in image.

Parameters:

include - true if man pages should be included, false to exclude them

See Also:

• getIncludeManPages()

getIncludeNativeCommands

public boolean getIncludeNativeCommands()

Attribute indicating whether to include generated native commands, and native commands from linked modules, in image.

Returns:

true if native commands should be included, false to exclude them

See Also:

• setIncludeNativeCommands(boolean)

setIncludeNativeCommands

public void setIncludeNativeCommands(boolean include)

Sets attribute indicating whether to include generated native commands, and native commands from linked modules, in image.

Parameters:

include - true if native commands should be included, false to exclude them

See Also:

• getIncludeNativeCommands()

getDebug

public boolean getDebug()

Attribute indicating whether linker should keep or strip debug information in classes.

Returns:

true if debug information will be retained, false if it will be stripped

See Also:

• setDebug(boolean)

setDebug

public void setDebug(boolean debug)

Sets attribute indicating whether linker should keep or strip debug information in classes.

Parameters:

debug - true if debug information should be retained, false if it should be stripped

See Also:

• getDebug()

getVerboseLevel

public LogLevel getVerboseLevel()

Attribute indicating whether linker should produce verbose output, and at what logging level that output should be shown.

Returns:

logging level at which to show linker's verbose output, or null to disable verbose output

See Also:

• setVerboseLevel(LogLevel)

setVerboseLevel

public void setVerboseLevel(LogLevel level)

Sets attribute indicating whether linker should produce verbose output, and at what logging level that output should be shown.

Parameters:

level - level logging level at which to show linker's verbose output, or null to disable verbose output

See Also:

• getVerboseLevel()

getDestDir

public File getDestDir()

Required attribute containing directory where linked image will be created.

Returns:

directory where linked image will reside

See Also:

• setDestDir(File)

setDestDir

public void setDestDir(File dir)

Sets attribute indicating directory where linked image will be created.

Parameters:

dir - directory in which image will be created by linker

See Also:

• getDestDir()

getCompress

public Link.CompressionLevel getCompress()

Attribute indicating level of compression linker will apply to image. This is exclusive with regard to createCompress(): only one of the two may be specified.

Returns:

compression level to apply, or null for none

See Also:

• setCompress(Link.CompressionLevel)
• createCompress()

setCompress

public void setCompress(Link.CompressionLevel level)

Sets attribute indicating level of compression linker will apply to image. This is exclusive with regard to createCompress(): only one of the two may be specified.

Parameters:

level - compression level to apply, or null for none

See Also:

• getCompress()
• createCompress()

createCompress

public Link.Compression createCompress()

Creates child <compress> element that specifies the level of compression the linker will apply, and optionally, which files in the image will be compressed. This is exclusive with regard to the compress attribute: only one of the two may be specified.

Returns:

new, unconfigured child element

See Also:

• setCompress(Link.CompressionLevel)

getEndianness

public Link.Endianness getEndianness()

Attribute which indicates whether certain files in the linked image will be big-endian or little-endian. If null, the underlying platform's endianness is used.

Returns:

endianness to apply, or null to platform default

See Also:

• setEndianness(Link.Endianness)

setEndianness

public void setEndianness(Link.Endianness endianness)

Sets attribute which indicates whether certain files in the linked image will be big-endian or little-endian. If null, the underlying platform's endianness is used.

Parameters:

endianness - endianness to apply, or null to use platform default

See Also:

• getEndianness()

getCheckDuplicateLegal

public boolean getCheckDuplicateLegal()

Attribute indicating whether linker should check legal notices with duplicate names, and refuse to merge them (usually using symbolic links) if their respective content is not identical.

Returns:

true if legal notice files with same name should be checked for identical content, false to suppress check

See Also:

• setCheckDuplicateLegal(boolean)

setCheckDuplicateLegal

public void setCheckDuplicateLegal(boolean check)

Sets attribute indicating whether linker should check legal notices with duplicate names, and refuse to merge them (usually using symbolic links) if their respective content is not identical.

Parameters:

check - true if legal notice files with same name should be checked for identical content, false to suppress check

See Also:

• getCheckDuplicateLegal()

getVmType

public Link.VMType getVmType()

Attribute indicating what type of JVM the linked image should have. If null, all JVM types are included.

Returns:

type of JVM linked image will have

See Also:

• setVmType(Link.VMType)

setVmType

public void setVmType(Link.VMType type)

Set attribute indicating what type of JVM the linked image should have. If null, all JVM types are included.

Parameters:

type - type of JVM linked image will have

See Also:

• getVmType()

createReleaseInfo

public Link.ReleaseInfo createReleaseInfo()

Creates child <releaseInfo> element that modifies the default release properties of the linked image.

Returns:

new, unconfigured child element

execute

public void execute()
             throws BuildException

Invokes the jlink tool to create a new linked image, unless the output directory exists and all of its files are files are newer than all files in the module path.

Overrides:

execute in class Task

Throws:

BuildException - if destDir is not set

BuildException - if module path is unset or empty

BuildException - if module list is empty

BuildException - if compressionLevel attribute and compression child element are both specified