设置系统属性

Question

我正在尝试按照此指令运行嵌入式门

它说:"系统属性gate.home应该设置为门安装目录." (http://gate.ac.uk/wiki/code-repository/)

我该怎么做呢？

此外,当我尝试运行EmbeddedAnnie的示例代码时,我收到以下错误:(我不知道它是否相关).

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

特德.

Answer 1

你可以通过几种方式做到这一点.

一个是当你运行你的应用程序时,你可以传递一个标志.

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

或者在需要此属性集的代码片段之前以编程方式在代码中设置它.Java保留了一个Properties对象以进行System广泛配置.

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

Answer 2

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

有关更多信息,请参阅:

• 该系统属性教程.
• 课程文档System.setProperty( String key , String value ).

Answer 3

您需要本地 GATE 安装的插件目录的路径。因此，如果 Gate 安装在“/home/user/GATE_Developer_8.1”中，则代码如下所示：

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

您不必从命令行设置gate.home。您可以在应用程序中设置它，只要在调用 Gate.init() 之前设置它即可。

Answer 4

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

之后，您可以稍后通过调用来获取其值

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

Answer 5

对于JBoss,在standalone.xml中,放在后面.

<extensions>
</extensions>

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

对于日食:

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