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HOW TO SET SYSTEM PROPERTY?

Ask Question
Asked 12 years, 3 months ago
Modified 1 year, 5 months ago
Viewed 315k times
This question shows research effort; it is useful and clear

92
This question does not show any research effort; it is unclear or not useful

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I am trying to follow this instruction for running gate embedded.

It says: "System property gate.home should be set to the gate installation
directory." (http://gate.ac.uk/wiki/code-repository/)

How do I do this?

Also when I try to run the example code of EmbeddedAnnie I get the following
error: ( I don't know if it is related or not ).

Initialising GATE...
GATE home system property ("gate.home") not set.
Attempting to guess...
Using "C:\Program Files (x86)\GATE-6.0" as GATE Home.
If this is not correct please set it manually using the -Dgate.home option in yo
ur start-up script
Using C:\Program Files (x86)\GATE-6.0 as GATE home
Using C:\Program Files (x86)\GATE-6.0\plugins as installed plug-ins directory.
Using C:\Program Files (x86)\GATE-6.0\gate.xml as site configuration file.
Using C:\Users\UNST\gate.xml as user configuration file
Using C:\Users\UNST\gate.session as user session file
Exception in thread "main" java.lang.NoClassDefFoundError: gate/creole/gazetteer
/AbstractGazetteer
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
1)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:296)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:296)
        at gate.util.GateClassLoader.loadClass(GateClassLoader.java:63)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at gate.creole.CreoleAnnotationHandler.processAnnotationsForResource(Cre
oleAnnotationHandler.java:193)
        at gate.creole.CreoleAnnotationHandler.processAnnotations(CreoleAnnotati
onHandler.java:169)
        at gate.creole.CreoleAnnotationHandler.processAnnotations(CreoleAnnotati
onHandler.java:173)
        at gate.creole.CreoleAnnotationHandler.processAnnotations(CreoleAnnotati
onHandler.java:173)
        at gate.creole.CreoleAnnotationHandler.processAnnotations(CreoleAnnotati
onHandler.java:157)
        at gate.creole.CreoleRegisterImpl.processFullCreoleXmlTree(CreoleRegiste
rImpl.java:358)
        at gate.creole.CreoleRegisterImpl.parseDirectory(CreoleRegisterImpl.java
:341)
        at gate.creole.CreoleRegisterImpl.registerDirectories(CreoleRegisterImpl
.java:306)
        at gate.Gate.initCreoleRepositories(Gate.java:449)
        at gate.Gate.init(Gate.java:230)
        at StandAloneAnnie.main(StandAloneAnnie.java:69)
Caused by: java.lang.ClassNotFoundException: gate.creole.gazetteer.AbstractGazet
teer
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        ... 27 more


 * java

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edited Dec 27, 2021 at 17:50

Yassin Hajaj
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asked Mar 4, 2011 at 5:05

FlethuseoFlethuseo
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You can do this via a couple ways.

One is when you run your application, you can pass it a flag.

java -Dgate.home="http://gate.ac.uk/wiki/code-repository" your_application

Or set it programmatically in code before the piece of code that needs this
property set. Java keeps a Properties object for System wide configuration.

Properties props = System.getProperties();
props.setProperty("gate.home", "http://gate.ac.uk/wiki/code-repository");


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answered Mar 4, 2011 at 5:13

wklwkl
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7
 * 17
   +1 - however, the gotcha with setting a system property programatically is
   that you need to do it early enough; i.e. before the "gate" code uses the
   property value.
   – Stephen C
   Mar 4, 2011 at 5:16
 * 1
   @StephenC, Yea, like setting java.system.class.loader etc.
   – Pacerier
   Aug 23, 2014 at 10:22
 * 1
   Why not do System.setProperty ?
   – Sayantan
   Jul 3, 2018 at 16:06
 * 3
   @Sayantan No reason other than I wrote this answer over 7 years ago and my
   Java experience was far less developed than it is now.
   – wkl
   Jul 3, 2018 at 16:08
 * 1
   @wkl ha ha, got it :)
   – Sayantan
   Aug 8, 2018 at 8:46

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System.setProperty("gate.home", "/some/directory");


For more information, see:

 * The System Properties tutorial.
 * Class doc for System.setProperty( String key , String value ).

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edited Nov 16, 2015 at 22:33

Basil Bourque
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answered Mar 4, 2011 at 5:11

Matthew FlaschenMatthew Flaschen
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2
 * So do I do this in the main function?
   – Flethuseo
   Mar 4, 2011 at 5:12
 * @Flethuseo, yeah, that should be fine for a simple app.
   – Matthew Flaschen
   Mar 4, 2011 at 5:14

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System.setProperty("gate.home", "/some/directory"); 


After that you can retrieve its value later by calling

String value =  System.getProperty("gate.home");


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edited Mar 28, 2015 at 9:19

Lrrr
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answered Mar 19, 2014 at 11:36

Shirishkumar BariShirishkumar Bari
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 * 1
   please explain as well.
   – Lakshmi
   Mar 19, 2014 at 11:55

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For JBoss, in standalone.xml, put after .

<extensions>
</extensions>

<system-properties>
    <property name="my.project.dir" value="/home/francesco" />
</system-properties>


For eclipse:

http://www.avajava.com/tutorials/lessons/how-do-i-set-system-properties.html?page=2

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answered Jul 20, 2016 at 22:48

Luiz valençaLuiz valença
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1
 * I came all the way for this!. somehow in JBoss, the other places where we set
   system property did not work.
   – ulab
   Jan 20, 2017 at 16:49

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You need the path of the plugins directory of your local GATE install. So if
Gate is installed in "/home/user/GATE_Developer_8.1", the code looks like this:

System.setProperty("gate.home", "/home/user/GATE_Developer_8.1/plugins");


You don't have to set gate.home from the command line. You can set it in your
application, as long as you set it BEFORE you call Gate.init().

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answered Aug 25, 2016 at 16:28

Jerry K.Jerry K.
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