在战争中访问属性文件

Question

I'm trying to access my properties file in a war. The code is working, but when i'm exporting the code into a war and use a POST (with an accepted input) using Fiddler, it cannot find the config.properties. (NullPointerException)

The input and webservice are running correctly. Just trying to figure out a way to edit my properties while using a war.

Some facts:

• I've made a RetreivePropertiesClass. This uses:

   properties.load(this.getClass() .getResourceAsStream("/WEB-INF/config.properties"));

• My properties file path:

   /com.webapp/WebContent/WEB-INF/config.properties

• I'm trying to use the properties data in:

   String url = RetreiveProperties.getUrl(); String driver = RetreiveProperties.getDriver(); String username = RetreiveProperties.getUsername(); String password = RetreiveProperties.getPassword(); // line below causes the NullPointerException Class.forName(driver);

• Getter used:

   public static String getDriver() { return driver = properties.getProperty("jdbc.driver"); }

• When the war is deployed, the properties file is in:

   webapps\\com.webapp1\\WEB-INF\\config.properties

• Config.properties:

   jdbc.url = jdbc:postgresql://127.0.0.1:2222/gisdb jdbc.driver = org.postgresql.Driver jdbc.username = postgres jdbc.password = admin

I already tried to work out the examples given here and here . Keeps giving the NullPointerException because the properties file isn't loaded.

Can anyone push me in the right direction?

Cheers!

Answer 1

If you are going to load the properties file from the classpath, it must be in the WEB-INF/classes directory inside of your war. (Or inside a jar inside of WEB-INF/lib ). The WEB-INF directory itself is not on the classpath.

If you make sure the file ends up as WEB-INF/classes/config.properties your above code should work if you change the getResourceAsStream call to getResourceAsStream("/config.properties")

Answer 2

If the method is a static method, the getClass() method will be failed, and prompts “Cannot make a static reference to the non-static method getClass() from the type Object“.

Instead, you should use CurrentClass.class.getClassLoader().getResourceAsStream.

Source: here