How do I link against my own library? [Solved]

[clintonb]

Greetings.

I'm refactoring some code. It is analogous to this:

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// Monolithic/Dynamic.java

import lejos.nxt.Button;

public class Dynamic extends Static {
   public static void main (String[] args) {
      System.out.println("Hello World");
       Button.waitForAnyPress();
   }
   private UsefulClass uc;
}

class Static { }

class UsefulClass { }


I compile and link it by running:

Code: Select all

nxjc Dynamic.java
nxjlink -o out.nxj Dynamic


And afterwards, I have the files:

Dynamic.class
Static.class
out.nxj
Dynamic.java
UsefulClass.class

in the directory.


Now, this is messy. (Believe me!) The dynamic class changes, but the other classes it depends upon do not. I'd like to put them into a .jar file, and link against it.

Here are the files I will create in an attempt to do that:

BaseDirectory/MyPackage/Static.java
BaseDirectory/MyPackage/UsefulClass.java
BaseDirectory/Elsewhere/Dynamic.java

The files to go in the package are as follows:

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// MyPackage/Static.java
package MyPackage;

public class Static { }


Code: Select all

// MyPackage/UsefulClass.java
package MyPackage;

public class UsefulClass { }


I go into the BaseDirectory and create a library as follows:

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nxjc MyPackage/*.java
jar cvf MyPackage.jar MyPackage/*.class


Now I have:

BaseDirectory/MyPackage/Static.class
BaseDirectory/MyPackage/Static.java
BaseDirectory/MyPackage/UsefulClass.class
BaseDirectory/MyPackage/UsefulClass.java
BaseDirectory/MyPackage.jar

Finally, I create the dynamic class, in BaseDirectory/Elsewhere/Dynamic.java. (I'm hoping that this file can be anywhere, so long as it can access the .jar library file):

Code: Select all

// Elsewhere/Dynamic.java

import lejos.nxt.Button;
import MyPackage.*;

public class Dynamic extends Static {
   public static void main (String[] args) {
      System.out.println("Hello World");
       Button.waitForAnyPress();
   }
   private UsefulClass uc;
}


I go into Elsewhere, and compile it:

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nxjc -cp ../MyPackage.jar Dynamic.java


Great. Now I try to link it, like this:

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nxjlink -o out.nxj -cp ../MyPackage.jar Dynamic


And get a bunch of error messages:

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js.tinyvm.TinyVMException: Class Dynamic (file Dynamic.class) not found in CLASSPATH /Users/clinton/Development/Enchanting/EnchantingTrunk/ThirdParty/lejos_nxj/bin/../lib/nxt/classes.jar:../MyPackage.jar
   at js.tinyvm.ClassRecord.getClassRecord(ClassRecord.java:855)
   at js.tinyvm.Binary.processClasses(Binary.java:362)
   at js.tinyvm.Binary.createFromClosureOf(Binary.java:309)
   at js.tinyvm.TinyVMTool.link(TinyVMTool.java:97)
   at js.tinyvm.TinyVMTool.link(TinyVMTool.java:48)
   at lejos.pc.tools.NXJLink.start(NXJLink.java:134)
   at lejos.pc.tools.NXJLink.run(NXJLink.java:101)
   at lejos.pc.tools.NXJLink.start(NXJLink.java:33)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at lejos.pc.tools.ToolStarter.startTool(ToolStarter.java:31)
   at lejos.pc.tools.NXJLink.main(NXJLink.java:28)


I've tried some variations, like this:

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nxjlink -o out.nxj -cp ../MyPackage.jar -cp . Dynamic


Getting:

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js.tinyvm.TinyVMException: Class MyPackage.Static (file MyPackage/Static.class) not found in CLASSPATH /Users/clinton/Development/Enchanting/EnchantingTrunk/ThirdParty/lejos_nxj/bin/../lib/nxt/classes.jar:.
   at js.tinyvm.ClassRecord.getClassRecord(ClassRecord.java:855)
   at ... ... ...


Clearly, I haven't quite got it yet. What is the proper command to link my dynamic java file against my custom library?

Thanks,
Clinton

[clintonb]

I should've looked more at how Java is invoked after you compile something. [url=http://docs.oracle.com/javase/tutorial/ext/basics/install.html]This documentation[url] helped me infer the right code, which is:

Code: Select all

nxjlink -o out.nxj -cp .:../MyPackage.jar Dynamic


Interestingly enough, to me, anyways, this does not work: nxjlink -o out.nxj -cp . -cp ../MyPackage.jar Dynamic

Cheers,
Clinton

[skoehler]

Interestingly enough, to me, anyways, this does not work: nxjlink -o out.nxj -cp . -cp ../MyPackage.jar Dynamic

The latter -cp overrides the former. That's also the behaviour of the java command.
Using -cp .:../MyPackage.jar is exactly the right thing to do.