How to read a MANIFEST.MF file from inside a jar?

[alvescarlos]

Hello,

I have an application that shows its version number by reading some attributes saved inside the MANIFEST.MF file of the applications jars.

After migrating to JBoss 5.1 this feature as stopped working, since everytime I try to read the file I get a

{quote}java.io.FileNotFoundException: myfile.jar (The system cannot find the file specified){quote}

This is the way I use to read the manifest attributes:

{code}// Get the location of this class

ProtectionDomain protectionDomain = clazz.getProtectionDomain();

CodeSource codeSource = protectionDomain.getCodeSource();

URL urlJar = codeSource.getLocation();

String jarFilename = urlJar.getFile();

// Replace all '%20' by ' '

jarFilename = jarFilename.replaceAll("%20", " ");

File file = new File(jarFilename);

if (file.isFile()) {

try {

// Open the JAR file

JarFile jarFile = new JarFile(file);

// Get the manifest

Manifest manifest = jarFile.getManifest();

// Close the JAR file

jarFile.close();

// Get the manifest main attributes

Attributes attribs = manifest.getMainAttributes();

// Get attribute value

myVersion = attribs.getValue("My-Version");

myBuild = attribs.getValue("My-Build");

} catch (IOException ex) {

//output the exception to the console instead of hiding it

ex.printStackTrace();

myVersion = "N/A";

myBuild = "N/A";

}

} else {

myVersion = "N/A";

myBuild = "N/A";

}{code}

I supose this as something to do with the new VFS implementation. Is this the right direction?

Can someone please point me to how can I get to a jar file on this new JBoss protocol?

Thank you very much in advance.

Cheers!

Hello,

I have an application that shows its version number by reading some attributes saved inside the MANIFEST.MF file of the applications jars.

After migrating to JBoss 5.1 this feature as stopped working, since everytime I try to read the file I get a

{quote}java.io.FileNotFoundException: myfile.jar (The system cannot find the file specified){quote}

This is the way I use to read the manifest attributes:

{code:java}// Get the location of this class
ProtectionDomain protectionDomain = clazz.getProtectionDomain();
CodeSource codeSource = protectionDomain.getCodeSource();
URL urlJar = codeSource.getLocation();
String jarFilename = urlJar.getFile();
// Replace all '%20' by ' '
jarFilename = jarFilename.replaceAll("%20", " ");
File file = new File(jarFilename);
if (file.isFile()) {
try {
// Open the JAR file
JarFile jarFile = new JarFile(file);
// Get the manifest
Manifest manifest = jarFile.getManifest();
// Close the JAR file
jarFile.close();
// Get the manifest main attributes
Attributes attribs = manifest.getMainAttributes();
// Get attribute value
myVersion = attribs.getValue("My-Version");
myBuild = attribs.getValue("My-Build");
} catch (IOException ex) {
//output the exception to the console instead of hiding it
ex.printStackTrace();
myVersion = "N/A";
myBuild = "N/A";
}
} else {
myVersion = "N/A";
myBuild = "N/A";
}{code}

I supose this as something to do with the new VFS implementation. Is this the right direction?

Can someone please point me to how can I get to a jar file on this new JBoss protocol?

Thank you very much in advance.

Cheers!

[wdfink]

It is against the JEE spec to use java.io package. There is no gurantee that the server support this.

Our idea was to have this as resource file and access via classloader.

[alvescarlos]

Thanks for you help. That works well.

But anyway, how would it be the correct way of implement reading a jar MANIFEST.MF over JBoss 5.1?

Cheers