How to create a java card library (jar file to be used in other programs)

Hi all,
I am working on JCOP and writing quite a bit of applets for the java card . Now i have lots of code that could be reusable for example sending SMS, encryption routine, etc.. So this part of the code i want to put into a utility class and create a package out of it. This utility package i must be able to import into my programs what i write.
I tried the normal way of creating the jar by renaming the CAP file of the utility class, also tried including the /javacard/* files also into the jar file as indicated by sfarmer(active forum member here). But none seems to work. I tried contacting NXP folks and they indicated that it may be possible only by way of Sharable Objects.
But some how i am not convinced why i should use Sharable object for this. So if any one can throw some light into this regard it will be immensely helpful to me and my project.
Regards
Prakash

Hi,
Well the variable defined are as below
public static byte[] msgdata = new byte[255];
private static final byte[] HEADER_TEMPLATE = {
          (byte) 0x81, (byte) 0x03, (byte) 0x01, (byte) 0x21, (byte) 0x00, // Command details tag
               (byte) 0x82, (byte) 0x02, (byte) 0x81, (byte) 0x02, // Device Identities tag
               (byte) 0x8D, // Text String tag
               (byte) 0x00, // length
               (byte) 0x04, // Text String tag
the msgdata is declared public so that i can access this as a Class member in my other program doing Utilities.msgdata. But the problem is now that if i dont declare it as final then the compiler gives me the below error
"library has initialized array for non-final, non-static field Utilities, msgdata, [B, attr jc-field: tok 0, public static"
If i make it final then i cannot change it... So now i am stuck..
Any help will be highly appreciated...
Regards
Prakash

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==========
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===========
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2013-05-20 21:39:01 dpchrist@desktop ~/sandbox/java/jar
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1. All name spaces must match -- identifiers, packages, file system, JAR contents, etc..
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http://holgerdanske.com/users/dpchrist/java/examples/jar-20130525-1301.tar.gz
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mkdir obj
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mkdir bin
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cd bin; java -cp .:../obj com.example.hello.Console
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|       `-- example
|           `-- hello
|               `-- Console.java
|-- bin
|   `-- com
|       `-- example
|           `-- hello
|               `-- Console.class
|-- ext
|   `-- com
|       `-- example
|           `-- util.jar
|-- libs
|   `-- com
|       `-- example
|           `-- util
|               `-- Hello.java
`-- obj
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        `-- example
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19 directories, 6 filesHTH,
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How to create a java card library (jar file to be used in other programs)

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