Class System

java.lang.Object
java.lang.System
public final classSystemextendsObject
TheSystem class contains several useful class fieldsand methods. It cannot be instantiated.Among the facilities provided by theSystem classare standard input, standard output, and error output streams;access to externally defined properties and environmentvariables; a means of loading files and libraries; and a utilitymethod for quickly copying a portion of an array.
Since:
1.0

  • Field Details

    • in

      public static final InputStream in
      The "standard" input stream. This stream is alreadyopen and ready to supply input data. This streamcorresponds to keyboard input or another input source specified bythe host environment or user. Applications should use the encodingspecified by thestdin.encoding propertyto convert input bytes to character data.
      API Note:
      The typical approach to read character data is to wrapSystem.inwithin the object that handles character encoding. After this is done,subsequent reading should use only the wrapper object; continuing tooperate directly onSystem.in results in unspecified behavior.

      Here are two common examples. Using anInputStreamReader:

          new InputStreamReader(System.in, System.getProperty("stdin.encoding"));
      Or using aScanner:
          new Scanner(System.in, System.getProperty("stdin.encoding"));

      For handling interactive input, consider usingConsole.

      See Also:

    • out

      public static final PrintStream out
      The "standard" output stream. This stream is alreadyopen and ready to accept output data. Typically this streamcorresponds to display output or another output destinationspecified by the host environment or user. The encoding usedin the conversion from characters to bytes is equivalent tostdout.encoding.

      For simple stand-alone Java applications, a typical way to writea line of output data is:

          System.out.println(data)

      See theprintln methods in classPrintStream.

      See Also:

    • err

      public static final PrintStream err
      The "standard" error output stream. This stream is alreadyopen and ready to accept output data.

      Typically this stream corresponds to display output or anotheroutput destination specified by the host environment or user. Byconvention, this output stream is used to display error messagesor other information that should come to the immediate attentionof a user even if the principal output stream, the value of thevariableout, has been redirected to a file or otherdestination that is typically not continuously monitored.The encoding used in the conversion from characters to bytes isequivalent tostderr.encoding.

      See Also:

  • Method Details

    • setIn

      public static void setIn(InputStream in)
      Reassigns the "standard" input stream.
      Parameters:
      in - the new standard input stream.
      Since:
      1.1

    • setOut

      public static void setOut(PrintStream out)
      Reassigns the "standard" output stream.
      Parameters:
      out - the new standard output stream
      Since:
      1.1

    • setErr

      public static void setErr(PrintStream err)
      Reassigns the "standard" error output stream.
      Parameters:
      err - the new standard error output stream.
      Since:
      1.1

    • console

      public static Console console()
      Returns the uniqueConsole object associatedwith the current Java virtual machine, if any.
      Returns:
      The system console, if any, otherwisenull.
      Since:
      1.6

    • inheritedChannel

      public static Channel inheritedChannel() throwsIOException
      Returns the channel inherited from the entity that created thisJava virtual machine.This method returns the channel obtained by invoking theinheritedChannel method of the system-wide defaultSelectorProvider object.

      In addition to the network-oriented channels described ininheritedChannel, this method may return other kinds ofchannels in the future.

      Returns:
      The inherited channel, if any, otherwisenull.
      Throws:
      IOException - If an I/O error occurs
      Since:
      1.5

    • setSecurityManager

      @Deprecated(since="17",forRemoval=true)public static void setSecurityManager(SecurityManager sm)
      Deprecated, for removal: This API element is subject to removal in a future version.
      This method originally setthe system-wide Security Manager. Setting a Security Manager is no longer supported. There is no replacement for the Security Manager or this method.
      ThrowsUnsupportedOperationException. Setting a security manageris not supported.
      Parameters:
      sm - ignored
      Throws:
      UnsupportedOperationException - always
      See Also:

    • getSecurityManager

      @Deprecated(since="17",forRemoval=true)public static SecurityManager getSecurityManager()
      Deprecated, for removal: This API element is subject to removal in a future version.
      This method originally returnedthe system-wide Security Manager. Setting a Security Manager is no longer supported. There is no replacement for the Security Manager or this method.
      Returnsnull. Setting a security manager is not supported.
      Returns:
      null
      See Also:

    • currentTimeMillis

      public static long currentTimeMillis()
      Returns the current time in milliseconds. Note thatwhile the unit of time of the return value is a millisecond,the granularity of the value depends on the underlyingoperating system and may be larger. For example, manyoperating systems measure time in units of tens ofmilliseconds.

      See the description of the classDate fora discussion of slight discrepancies that may arise between"computer time" and coordinated universal time (UTC).

      Returns:
      the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.
      See Also:

    • nanoTime

      public static long nanoTime()
      Returns the current value of the running Java Virtual Machine'shigh-resolution time source, in nanoseconds.This method can only be used to measure elapsed time and isnot related to any other notion of system or wall-clock time.The value returned represents nanoseconds since some fixed butarbitraryorigin time (perhaps in the future, so valuesmay be negative). The same origin is used by all invocations ofthis method in an instance of a Java virtual machine; othervirtual machine instances are likely to use a different origin.

      This method provides nanosecond precision, but not necessarilynanosecond resolution (that is, how frequently the value changes)- no guarantees are made except that the resolution is at least asgood as that ofcurrentTimeMillis().

      Differences in successive calls that span greater thanapproximately 292 years (263 nanoseconds) will notcorrectly compute elapsed time due to numerical overflow.

      The values returned by this method become meaningful only whenthe difference between two such values, obtained within the sameinstance of a Java virtual machine, is computed.

      For example, to measure how long some code takes to execute:

      long startTime = System.nanoTime();// ... the code being measured ...long elapsedNanos = System.nanoTime() - startTime;

      To compare elapsed time against a timeout, use

      if (System.nanoTime() - startTime >= timeoutNanos) ...
      instead of
      if (System.nanoTime() >= startTime + timeoutNanos) ...
      because of the possibility of numerical overflow.

      Returns:
      the current value of the running Java Virtual Machine's high-resolution time source, in nanoseconds
      Since:
      1.5

    • arraycopy

      public static void arraycopy(Object src, int srcPos,Object dest, int destPos, int length)
      Copies an array from the specified source array, beginning at thespecified position, to the specified position of the destination array.A subsequence of array components are copied from the sourcearray referenced bysrc to the destination arrayreferenced bydest. The number of components copied isequal to thelength argument. The components atpositionssrcPos throughsrcPos+length-1 in the source array are copied intopositionsdestPos throughdestPos+length-1, respectively, of the destinationarray.

      If thesrc anddest arguments refer to thesame array object, then the copying is performed as if thecomponents at positionssrcPos throughsrcPos+length-1 were first copied to a temporaryarray withlength components and then the contents ofthe temporary array were copied into positionsdestPos throughdestPos+length-1 of thedestination array.

      Ifdest isnull, then aNullPointerException is thrown.

      Ifsrc isnull, then aNullPointerException is thrown and the destinationarray is not modified.

      Otherwise, if any of the following is true, anArrayStoreException is thrown and the destination isnot modified:

      • Thesrc argument refers to an object that is not an array.
      • Thedest argument refers to an object that is not an array.
      • Thesrc argument anddest argument refer to arrays whose component types are different primitive types.
      • Thesrc argument refers to an array with a primitive component type and thedest argument refers to an array with a reference component type.
      • Thesrc argument refers to an array with a reference component type and thedest argument refers to an array with a primitive component type.

      Otherwise, if any of the following is true, anIndexOutOfBoundsException isthrown and the destination is not modified:

      • ThesrcPos argument is negative.
      • ThedestPos argument is negative.
      • Thelength argument is negative.
      • srcPos+length is greater thansrc.length, the length of the source array.
      • destPos+length is greater thandest.length, the length of the destination array.

      Otherwise, if any actual component of the source array frompositionsrcPos throughsrcPos+length-1 cannot be converted to the componenttype of the destination array by assignment conversion, anArrayStoreException is thrown. In this case, letk be the smallest nonnegative integer less thanlength such thatsrc[srcPos+k]cannot be converted to the component type of the destinationarray; when the exception is thrown, source array components frompositionssrcPos throughsrcPos+k-1will already have been copied to destination array positionsdestPos throughdestPos+k-1 and no otherpositions of the destination array will have been modified.(Because of the restrictions already itemized, thisparagraph effectively applies only to the situation where botharrays have component types that are reference types.)

      Parameters:
      src - the source array.
      srcPos - starting position in the source array.
      dest - the destination array.
      destPos - starting position in the destination data.
      length - the number of array elements to be copied.
      Throws:
      IndexOutOfBoundsException - if copying would cause access of data outside array bounds.
      ArrayStoreException - if an element in thesrc array could not be stored into thedest array because of a type mismatch.
      NullPointerException - if eithersrc ordest isnull.

    • identityHashCode

      public static int identityHashCode(Object x)
      Returns the same hash code for the given object aswould be returned by the default method hashCode(),whether or not the given object's class overrideshashCode().The hash code for the null reference is zero.
      Parameters:
      x - object for which the hashCode is to be calculated
      Returns:
      the hashCode
      Since:
      1.1
      See Also:

    • getProperties

      public static Properties getProperties()
      Determines the current system properties.

      The current set of system properties for use by thegetProperty(String) method is returned as aProperties object. If there is no current set ofsystem properties, a set of system properties is first created andinitialized. This set of system properties includes a valuefor each of the following keys unless the description of the associatedvalue indicates that the value is optional.

      Shows property keys and associated values
      KeyDescription of Associated Value
      java.versionJava Runtime Environment version, which may be interpreted as aRuntime.Version
      java.version.dateJava Runtime Environment version date, in ISO-8601 YYYY-MM-DD format, which may be interpreted as aLocalDate
      java.vendorJava Runtime Environment vendor
      java.vendor.urlJava vendor URL
      java.vendor.versionJava vendor version(optional)
      java.homeJava installation directory
      java.vm.specification.versionJava Virtual Machine specification version, whose value is thefeature element of theruntime version
      java.vm.specification.vendorJava Virtual Machine specification vendor
      java.vm.specification.nameJava Virtual Machine specification name
      java.vm.versionJava Virtual Machine implementation version which may be interpreted as aRuntime.Version
      java.vm.vendorJava Virtual Machine implementation vendor
      java.vm.nameJava Virtual Machine implementation name
      java.specification.versionJava Runtime Environment specification version, whose value is thefeature element of theruntime version
      java.specification.maintenance.versionJava Runtime Environment specification maintenance version, may be interpreted as a positive integer(optional, see below)
      java.specification.vendorJava Runtime Environment specification vendor
      java.specification.nameJava Runtime Environment specification name
      java.class.versionLatest Java class file format version recognized by the Java runtime as"MAJOR.MINOR" whereMAJOR andMINOR are both formatted as decimal integers
      java.class.pathJava class path (refer toClassLoader.getSystemClassLoader() for details)
      java.library.pathList of paths to search when loading libraries
      java.io.tmpdirDefault temp file path
      os.nameOperating system name
      os.archOperating system architecture
      os.versionOperating system version
      file.separatorFile separator ("/" on UNIX)
      path.separatorPath separator (":" on UNIX)
      line.separatorLine separator ("\n" on UNIX)
      user.nameUser's account name
      user.homeUser's home directory
      user.dirUser's current working directory
      native.encodingCharacter encoding name derived from the host environment and the user's settings. Setting this system property on the command line has no effect.
      stdin.encodingCharacter encoding name forSystem.in. The Java runtime can be started with the system property set toUTF-8. Starting it with the property set to another value results in unspecified behavior.
      stdout.encodingCharacter encoding name forSystem.out andSystem.console(). The Java runtime can be started with the system property set toUTF-8. Starting it with the property set to another value results in unspecified behavior.
      stderr.encodingCharacter encoding name forSystem.err. The Java runtime can be started with the system property set toUTF-8. Starting it with the property set to another value results in unspecified behavior.

      Thejava.specification.maintenance.version property isdefined if the specification implemented by this runtime at thetime of its construction had undergone amaintenancerelease. When defined, its value identifies thatmaintenance release. To indicate the first maintenance releasethis property will have the value"1", to indicate thesecond maintenance release this property will have the value"2", and so on.

      Multiple paths in a system property value are separated by the pathseparator character of the platform.

      Additional locale-related system properties defined by theDefault Locale section in theLocaleclass description may also be obtained with this method.

      API Note:
      Changing a standard system property may have unpredictable resultsunless otherwise specified.Property values may be cached during initialization or on first use.Setting a standard property after initialization usinggetProperties(),setProperties(Properties),setProperty(String, String), orclearProperty(String) may not have the desired effect.
      Implementation Note:
      In addition to the standard system properties, the systemproperties may include the following keys:
      Shows property keys and associated values
      KeyDescription of Associated Value
      jdk.module.pathThe application module path
      jdk.module.upgrade.pathThe upgrade module path
      jdk.module.mainThe module name of the initial/main module
      jdk.module.main.classThe main class name of the initial module
      file.encodingThe name of the default charset, defaults toUTF-8. The property may be set on the command line to the valueUTF-8 orCOMPAT. If set on the command line to the valueCOMPAT then the value is replaced with the value of thenative.encoding property during startup. Setting the property to a value other thanUTF-8 orCOMPAT results in unspecified behavior.
      Returns:
      the system properties
      See Also:

    • lineSeparator

      public static String lineSeparator()
      Returns the system-dependent line separator string. It alwaysreturns the same value - the initial value of thesystem propertyline.separator.

      On UNIX systems, it returns"\n"; on MicrosoftWindows systems it returns"\r\n".

      Returns:
      the system-dependent line separator string
      Since:
      1.7

    • setProperties

      public static void setProperties(Properties props)
      Sets the system properties to theProperties argument.

      The argument becomes the current set of system properties for useby thegetProperty(String) method. If the argument isnull, then the current set of system properties isforgotten.

      API Note:
      Changing a standard system property may have unpredictable resultsunless otherwise specified.SeegetProperties for details.
      Parameters:
      props - the new system properties.
      See Also:

    • getProperty

      public static String getProperty(String key)
      Gets the system property indicated by the specified key.

      If there is no current set of system properties, a set of systemproperties is first created and initialized in the same manner asfor thegetProperties method.

      API Note:
      Changing a standard system property may have unpredictable resultsunless otherwise specified.SeegetProperties for details.
      Parameters:
      key - the name of the system property.
      Returns:
      the string value of the system property, ornull if there is no property with that key.
      Throws:
      NullPointerException - ifkey isnull.
      IllegalArgumentException - ifkey is empty.
      See Also:

    • getProperty

      public static String getProperty(String key,String def)
      Gets the system property indicated by the specified key.

      If there is no current set of system properties, a set of systemproperties is first created and initialized in the same manner asfor thegetProperties method.

      Parameters:
      key - the name of the system property.
      def - a default value.
      Returns:
      the string value of the system property, or the default value if there is no property with that key.
      Throws:
      NullPointerException - ifkey isnull.
      IllegalArgumentException - ifkey is empty.
      See Also:

    • setProperty

      public static String setProperty(String key,String value)
      Sets the system property indicated by the specified key.
      API Note:
      Changing a standard system property may have unpredictable resultsunless otherwise specified.SeegetProperties for details.
      Parameters:
      key - the name of the system property.
      value - the value of the system property.
      Returns:
      the previous value of the system property, ornull if it did not have one.
      Throws:
      NullPointerException - ifkey orvalue isnull.
      IllegalArgumentException - ifkey is empty.
      Since:
      1.2
      See Also:

    • clearProperty

      public static String clearProperty(String key)
      Removes the system property indicated by the specified key.
      API Note:
      Changing a standard system property may have unpredictable resultsunless otherwise specified.SeegetProperties method for details.
      Parameters:
      key - the name of the system property to be removed.
      Returns:
      the previous string value of the system property, ornull if there was no property with that key.
      Throws:
      NullPointerException - ifkey isnull.
      IllegalArgumentException - ifkey is empty.
      Since:
      1.5
      See Also:

    • getenv

      public static String getenv(String name)
      Gets the value of the specified environment variable. Anenvironment variable is a system-dependent external namedvalue.

      Systemproperties andenvironment variables are bothconceptually mappings between names and values. Bothmechanisms can be used to pass user-defined information to aJava process. Environment variables have a more global effect,because they are visible to all descendants of the processwhich defines them, not just the immediate Java subprocess.They can have subtly different semantics, such as caseinsensitivity, on different operating systems. For thesereasons, environment variables are more likely to haveunintended side effects. It is best to use system propertieswhere possible. Environment variables should be used when aglobal effect is desired, or when an external system interfacerequires an environment variable (such asPATH).

      On UNIX systems the alphabetic case ofname istypically significant, while on Microsoft Windows systems it istypically not. For example, the expressionSystem.getenv("FOO").equals(System.getenv("foo"))is likely to be true on Microsoft Windows.

      Parameters:
      name - the name of the environment variable
      Returns:
      the string value of the variable, ornull if the variable is not defined in the system environment
      Throws:
      NullPointerException - ifname isnull
      See Also:

    • getenv

      public static Map<String,String> getenv()
      Returns an unmodifiable string map view of the current system environment.The environment is a system-dependent mapping from names tovalues which is passed from parent to child processes.

      If the system does not support environment variables, anempty map is returned.

      The returned map will never contain null keys or values.Attempting to query the presence of a null key or value willthrow aNullPointerException. Attempting to querythe presence of a key or value which is not of typeString will throw aClassCastException.

      The returned map and its collection views may not obey thegeneral contract of theObject.equals(Object) andObject.hashCode() methods.

      The returned map is typically case-sensitive on all platforms.

      When passing information to a Java subprocess,system propertiesare generally preferred over environment variables.

      Returns:
      the environment as a map of variable names to values
      Since:
      1.5
      See Also:

    • getLogger

      public static System.Logger getLogger(String name)
      Returns an instance ofLogger for the caller'suse.
      API Note:
      This method may defer calling theLoggerFinder.getLogger method to create an actual logger supplied bythe logging backend, for instance, to allow loggers to be obtained duringthe system initialization time.
      Implementation Requirements:
      Instances returned by this method route messages to loggersobtained by callingLoggerFinder.getLogger(name, module), wheremodule is the caller's module.In cases whereSystem.getLogger is called from a context wherethere is no caller frame on the stack (e.g when called directlyfrom a JNI attached thread),IllegalCallerException is thrown.To obtain a logger in such a context, use an auxiliary class that willimplicitly be identified as the caller, or use the systemLoggerFinder to obtain a logger instead.Note that doing the latter may eagerly initialize the underlyinglogging system.
      Parameters:
      name - the name of the logger.
      Returns:
      an instance ofSystem.Logger that can be used by the calling class.
      Throws:
      NullPointerException - ifname isnull.
      IllegalCallerException - if there is no Java caller frame on the stack.
      Since:
      9

    • getLogger

      public static System.Logger getLogger(String name,ResourceBundle bundle)
      Returns a localizable instance ofLogger for the caller's use.The returned logger will use the provided resource bundle for messagelocalization.
      API Note:
      This method is intended to be used after the system is fully initialized.This method may trigger the immediate loading and initializationof theSystem.LoggerFinder service, which may cause issues if theJava Runtime is not ready to initialize the concrete serviceimplementation yet.System classes which may be loaded early in the boot sequence andneed to log localized messages should create a logger usinggetLogger(java.lang.String) and then use the log methods thattake a resource bundle as parameter.
      Implementation Requirements:
      The returned logger will perform message localization as specifiedbyLoggerFinder.getLocalizedLogger(name, bundle, module), wheremodule is the caller's module.In cases whereSystem.getLogger is called from a context wherethere is no caller frame on the stack (e.g when called directlyfrom a JNI attached thread),IllegalCallerException is thrown.To obtain a logger in such a context, use an auxiliary class thatwill implicitly be identified as the caller, or use the systemLoggerFinder to obtain a logger instead.Note that doing the latter may eagerly initialize the underlyinglogging system.
      Parameters:
      name - the name of the logger.
      bundle - a resource bundle.
      Returns:
      an instance ofSystem.Logger which will use the providedresource bundle for message localization.
      Throws:
      NullPointerException - ifname isnull orbundle isnull.
      IllegalCallerException - if there is no Java caller frame on the stack.
      Since:
      9

    • exit

      public static void exit(int status)
      Initiates theshutdown sequence of the Java VirtualMachine. This method initiates the shutdown sequence (if it is not already initiated)and then blocks indefinitely. This method neither returns nor throws an exception;that is, it does not complete either normally or abruptly.

      The argument serves as a status code. By convention, a nonzero status codeindicates abnormal termination.

      The callSystem.exit(n) is effectively equivalent to the call:

          Runtime.getRuntime().exit(n)

      Implementation Note:
      The initiation of the shutdown sequence is logged byRuntime.exit(int).
      Parameters:
      status - exit status.
      See Also:

    • gc

      public static void gc()
      Runs the garbage collector in the Java Virtual Machine.

      Calling thegc method suggests that the Java Virtual Machineexpend effort toward recycling unused objects in order tomake the memory they currently occupy available for reuseby the Java Virtual Machine.When control returns from the method call, the Java Virtual Machinehas made a best effort to reclaim space from all unused objects.There is no guarantee that this effort will recycle any particularnumber of unused objects, reclaim any particular amount of space, orcomplete at any particular time, if at all, before the method returns or ever.There is also no guarantee that this effort will determinethe change of reachability in any particular number of objects,or that any particular number ofReferenceobjects will be cleared and enqueued.

      The callSystem.gc() is effectively equivalent to thecall:

      Runtime.getRuntime().gc()

      See Also:

    • runFinalization

      @Deprecated(since="18",forRemoval=true)public static void runFinalization()
      Deprecated, for removal: This API element is subject to removal in a future version.
      Finalization has been deprecated for removal. SeeObject.finalize() for background information and detailsabout migration options.

      When running in a JVM in which finalization has been disabled or removed,no objects will be pending finalization, so this method does nothing.

      Runs the finalization methods of any objects pending finalization.Calling this method suggests that the Java Virtual Machine expendeffort toward running thefinalize methods of objectsthat have been found to be discarded but whosefinalizemethods have not yet been run. When control returns from themethod call, the Java Virtual Machine has made a best effort tocomplete all outstanding finalizations.

      The callSystem.runFinalization() is effectivelyequivalent to the call:

      Runtime.getRuntime().runFinalization()

      SeeJava Language Specification:
      12.6 Finalization of Class Instances
      See Also:

    • load

      public static void load(String filename)
      load is arestricted method of the Java platform.
      Programs can only useload when access to restricted methods is enabled.
      Restricted methods are unsafe, and, if used incorrectly, might crash the JVM or result in memory corruption.
      Loads the native library specified by the filename argument. The filenameargument must be an absolute path name.If the filename argument, when stripped of any platform-specific libraryprefix, path, and file extension, indicates a library whose name is,for example, L, and a native library called L is statically linkedwith the VM, then the JNI_OnLoad_L function exported by the libraryis invoked rather than attempting to load a dynamic library.A filename matching the argument does not have to exist in thefile system.See the JNI Specificationfor more details.Otherwise, the filename argument is mapped to a native library image inan implementation-dependent manner.

      The callSystem.load(name) is effectively equivalentto the call:

      Runtime.getRuntime().load(name)

      Parameters:
      filename - the file to load.
      Throws:
      UnsatisfiedLinkError - if either the filename is not an absolute path name, the native library is not statically linked with the VM, or the library cannot be mapped to a native library image by the host system.
      NullPointerException - iffilename isnull
      IllegalCallerException - if the caller is in a module that does not have native access enabled.
      External Specifications
      See Also:

    • loadLibrary

      public static void loadLibrary(String libname)
      loadLibrary is arestricted method of the Java platform.
      Programs can only useloadLibrary when access to restricted methods is enabled.
      Restricted methods are unsafe, and, if used incorrectly, might crash the JVM or result in memory corruption.
      Loads the native library specified by thelibnameargument. Thelibname argument must not contain any platformspecific prefix, file extension or path. If a native librarycalledlibname is statically linked with the VM, then theJNI_OnLoad_libname function exported by the library is invoked.See the JNI Specificationfor more details.Otherwise, the libname argument is loaded from a system librarylocation and mapped to a native library image in animplementation-dependent manner.

      The callSystem.loadLibrary(name) is effectivelyequivalent to the call

      Runtime.getRuntime().loadLibrary(name)

      Parameters:
      libname - the name of the library.
      Throws:
      UnsatisfiedLinkError - if either the libname argument contains a file path, the native library is not statically linked with the VM, or the library cannot be mapped to a native library image by the host system.
      NullPointerException - iflibname isnull
      IllegalCallerException - if the caller is in a module that does not have native access enabled.
      External Specifications
      See Also:

    • mapLibraryName

      public static String mapLibraryName(String libname)
      Maps a library name into a platform-specific string representinga native library.
      Parameters:
      libname - the name of the library.
      Returns:
      a platform-dependent native library name.
      Throws:
      NullPointerException - iflibname isnull
      Since:
      1.2
      See Also: