What is the difference between java javaw and javaws

Question

What is the difference between java  javaw  and javaws  I have found that on Windows most usage of Java is done using javaw

User · Answer

java exe is associated with the console  whereas javaw exe doesn t have any such association  So  when java exe is run  it automatically opens a command prompt window where output and error streams are shown

User · Answer

From http   publib boulder ibm com infocenter javasdk v6r0 index jsp topic  2Fcom ibm java doc user aix32 60 2Fuser 2Fjava html      The javaw command is identical to java  except that javaw has no associated console window  Use javaw when you do not want a command prompt window to be displayed  The javaw launcher displays a window with error information if it fails    And javaws is for Java web start applications  applets  or something like that  I would suspect

User · Answer

java  Java application executor which is associated with a console to display output errors  javaw   Java windowed  application executor not associated with console  So no display of output errors  It can be used to silently push the output errors to text files  It is mostly used to launch GUI-based applications   javaws   Java web start  to download and run the distributed web applications  Again  no console is associated   All are part of JRE and use the same JVM

User · Answer

I have checked that the output redirection works with javaw   javaw -cp     mypath MyClass     arguments 1 gt log txt 2 gt err txt   It means  if the Java application prints out anything via System out or System err  it is written to those files  as also with using java  without w   Especially on starting java  the JRE may write starting errors  class not found  on the error output pipe  In this respect  it is essential to know about errors  I suggest to use the console redirection in any case if javaw is invoked   In opposite if you use  start java      1 gt log txt 2 gt err txt   With the Windows console start command  the console output redirection does not work with java nor with javaw   Explanation  why it is so  I think that javaw opens an internal process in the OS  adequate using the java lang Process class   and transfers a known output redirection to this process  If no redirection is given on the command line  nothing is redirected and the internal started process for javaw doesn t have any console outputs  The behavior for java lang Process is similar  The virtual machine may use this internal feature for javaw too   If you use  start   the Windows console creates a new process for Windows to execute the command after start  but this mechanism does not use a given redirection for the started sub process  unfortunately

User · Answer

See Java tools documentation for   java command1 javaw command2    The java tool launches a Java application  It does this by starting a Java runtime environment  loading a specified class  and invoking that class s main method  The javaw command is identical to java  except that with javaw there is no associated console window  Use javaw when you don t want a command prompt window to appear     javaws command  the  quot Java Web Start command quot    The javaws command launches Java Web Start  which is the reference implementation of the Java Network Launching Protocol  JNLP   Java Web Start launches Java applications applets hosted on a network    If a JNLP file is specified  javaws will launch the Java application applet specified in the JNLP file  The javaws launcher has a set of options that are supported in the current release  However  the options may be removed in a future release   See also JDK 9 Release Notes Deprecated APIs  Features  and Options   Java Deployment Technologies are deprecated and will be removed in a future release  Java Applet and WebStart functionality  including the Applet API  the Java plug-in  the Java Applet Viewer  JNLP and Java Web Start  including the javaws tool  are all deprecated in JDK 9 and will be removed in a future release

[java] What is the difference between 'java', 'javaw', and 'javaws'?

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