Open a file embbeded in a jar file

[khanhly via JavaKB.com]

I need to get data out from a text/properties file which embedded inside a
jar file. Here is the sample code
String filename = "com.config.myfile.resources.loggingKeyList.
properties"
File fn = new File(filename);
System.out.println (fn.exists());
When run, it prints "false". It can not locate the file.

Is there the way that I can open a file embedded inside a jar file?
Thanks

 

[Guest]

I need to get data out from a text/properties file which embedded inside a
jar file. Here is the sample code
String filename = "com.config.myfile.resources.loggingKeyList.
properties"
File fn = new File(filename);
System.out.println (fn.exists());
When run, it prints "false". It can not locate the file.

Is there the way that I can open a file embedded inside a jar file?

Try:

getClass().getResourceAsStream(filename)

Arne

 

[Andrew Thompson]

I need to get data out from a text/properties file which embedded inside a
jar file. Here is the sample code
String filename = "com.config.myfile.resources.loggingKeyList.
properties"
File fn = new File(filename);
System.out.println (fn.exists());
When run, it prints "false". It can not locate the file.

Is there the way that I can open a file embedded inside a jar file?

Sure. Here is an example of finding the 'Object'
class by it's name - note
a) the '/'s
b) the firstmost '/' of the successful string.

<sscce>
class GetResourceTest {
public static void main(String args[]) {
Object o = new Object();
String location = "java/lang/Object.class";
java.net.URL url = o.getClass().getResource(
location);
System.out.println( url );
url = o.getClass().getResource(
"/" + location);
System.out.println( url );
}
}</sscce>

HTH

Andrew T.

 

[khanhly via JavaKB.com]

Thank you for your help.
I have tried your suggestion, but it still does not work since the properties
file does not locate loosely in the system. It is embbeded inside a jar file.


Here my situation:
I have a war file which contains several jar files. The properties file is
embbeded inside one of the jar file.
I tried to load that properties file and I have tried this way

String name = "com.myjar.resources.log.properties";
InputStream st = ClassLoader.getSystemClassLoader().getResourceAsStream
(name);

It can not find the properties file

I need to get data out from a text/properties file which embedded inside a
jar file. Here is the sample code

[quoted text clipped - 5 lines]

Is there the way that I can open a file embedded inside a jar file?

Sure. Here is an example of finding the 'Object'
class by it's name - note
a) the '/'s
b) the firstmost '/' of the successful string.

<sscce>
class GetResourceTest {
public static void main(String args[]) {
Object o = new Object();
String location = "java/lang/Object.class";
java.net.URL url = o.getClass().getResource(
location);
System.out.println( url );
url = o.getClass().getResource(
"/" + location);
System.out.println( url );
}
}</sscce>

HTH

Andrew T.

 

[Moiristo]

Thank you for your help.
I have tried your suggestion, but it still does not work since the properties
file does not locate loosely in the system. It is embbeded inside a jar file.


Here my situation:
I have a war file which contains several jar files. The properties file is
embbeded inside one of the jar file.
I tried to load that properties file and I have tried this way

String name = "com.myjar.resources.log.properties";
InputStream st = ClassLoader.getSystemClassLoader().getResourceAsStream
(name);

It can not find the properties file

The location you are looking for is incorrect. You must not specify the
extension. In your case, it looks for
'com/myjar/resources/log/properties.properties. So, maybe it works when
you change 'name' to "com.myjar.resources.log".

 

[Andrew Thompson]

Thank you for your help.

Please demonstrate your appreciation by not top-posting
in future.

I have tried your suggestion, but it still does not work since the properties
file does not locate loosely in the system.

Neither does ....

...It is embbeded inside a jar file.

Which is embedded in the rt.jar.

Here my situation:
I have a war file which contains several jar files. The properties file is
embbeded inside one of the jar file.

A WAR file is a compressed file. If it remains
unexpanded, the class.getResource() will only
find the other 'jar file the properties file is embedded in',
but not the *properties* *file* itself.

Is your WAR file expanded?

Andrew T.

 

[khanhly via JavaKB.com]

Please demonstrate your appreciation by not top-posting
in future.


Neither does ....



Which is embedded in the rt.jar.

The properties file

A WAR file is a compressed file. If it remains
unexpanded, the class.getResource() will only
find the other 'jar file the properties file is embedded in',
but not the *properties* *file* itself.

Is your WAR file expanded?

Yes, Tomcat expands the war file when it starts up

 

[Andrew Thompson]

Andrew Thompson wrote: ....

Yes, Tomcat expands the war file when it starts up

OK. AFAIR, servlet containers add jars in the
WEB-INF/lib/ directory to the classpath.
Is your jar inside that directory?

Andrew T.

 

[Thomas Fritsch]

Here my situation:
I have a war file which contains several jar files. The properties file
is
embbeded inside one of the jar file.
I tried to load that properties file and I have tried this way

String name = "com.myjar.resources.log.properties";
InputStream st =
ClassLoader.getSystemClassLoader().getResourceAsStream
(name);

It can not find the properties file

I have no experience with .war files. But I think you'll more have success
with:
String name = "/com/myjar/resources/log.properties";
InputStream st = ...;
[Note the leading '/' !]

 

[khanhly via JavaKB.com]

...

OK. AFAIR, servlet containers add jars in the
WEB-INF/lib/ directory to the classpath.
Is your jar inside that directory?

Yes, after expanded, all the jar files are in the WEB-INF/lib/ dir

When I runs in the Eclipse IDE, it find the properties file OK, but not when
it runs in jar file under Tomcat env.
I have tried several different ways declaring the file path
/com/myjar/log/config.properties
com/myjar/log/config.properties
com/myjar/log/config
com.myjar.log.config
None of those works