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:

  • Constructor Details

    • Link

      public Link()

  • Method Details

    • createModulePath

      public Path createModulePath()
      Adds child <modulePath> element.
      Returns:
      new, empty child element
      See Also:

    • getModulePath

      public Path getModulePath()
      Attribute containing path of directories containing linkable modules.
      Returns:
      current module path, possibly null
      See Also:

    • setModulePath

      public void setModulePath(Path path)
      Sets attribute containing path of directories containing linkable modules.
      Parameters:
      path - new module path
      See Also:

    • setModulePathRef

      public void setModulePathRef(Reference ref)
      Sets module path as a reference.
      Parameters:
      ref - path reference
      See Also:

    • createModule

      public Link.ModuleSpec createModule()
      Adds child <module> element, specifying a module to link.
      Returns:
      new, unconfigured child element
      See Also:

    • 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

      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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • getDestDir

      public File getDestDir()
      Required attribute containing directory where linked image will be created.
      Returns:
      directory where linked image will reside
      See Also:

    • 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:

    • 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

      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:

    • 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:

    • 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

      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:

    • 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

      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:

    • 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

      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:

    • 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