[e-lang] Re: Java connection :))

[Mark Miller]

Peter Dimitrov wrote:
> Hi Mark,
> 
> I still struggle to import my own class in E:)) I tried the following after
> I changed the CLASSPATH to point to MyClass.class (this is my class :)))
> 
> def mycls := <unsafe:MyClass>
> def mycls := <unsafe:MyClass>()
> def mycls := <unsafe:java.MyClass>()
> 
> and many more but still get the same error:
> 
> "# problem: Failed: java.MyClass not found" or
> "# problem: Failed: MyClass not found"
> 
> How that exactly has to be done?

How did you change the classpath? The recommended way is to invoke rune as 
follows:

     $ rune -cpa dir ...

or

     $ rune -cpb dir ...

where "dir" is the root of a directory tree containing your MyClass.class 
under the appropriate package path. (If the directory contains spaces or other 
odd characters, be sure to put quotes around it.) The "..." is the remainder 
of whatever your normal rune invocation would be, and would be empty for 
interactive use. "-cpa" stands for "class path after" and appends the 
directory to the class path, putting it last in the search order. "-cpb" 
stands for "class path before", and prepends it. You can have multiple such 
options in one rune invocation.

For example, if your MyClass.class is in the package foo.bar, and is located 
on the file system at c:/x/y/foo/bar/MyClass.class, then you could say

     $ rune -cpa "c:/x/y"
     ? def mycls := <unsafe:foo.bar.MyClass>

If MyClass.class is not in a package, i.e., is implicitly in the empty 
package, and if it's located at c:/x/y/MyClass.class, then

     $ rune -cpa "c:/x/y"
     ? def mycls := <unsafe:MyClass>

should indeed work, though I have little experience with package-less classes.

Be sure that MyClass is declared "public".

For more usage info on rune, say

     $ rune --help

Especially useful is the option "-show" to see the command line that rune 
would have executed, rather than executing it. Each command-line argument is 
shown on a separate line, rather than using quotes. If you want to issue a 
corresponding command to the Cygwin shell, you'll need the quotes. On my 
WindowsXP laptop

     $ rune -cpb "c:/x/y" -show
     LD_LIBRARY_PATH="c:/Program Files/erights.org/bin/win32/x86"
     /cygdrive/c/j2sdk1.4.2_05/bin/java.exe
     -cp
     c:/x/y;c:/Program Files/erights.org/e.jar;c:/Program 
Files/erights.org/bin/win32/swt.jar
     -Xfuture
     -De.home=c:/Program Files/erights.org/
     -Djava.library.path=c:/Program Files/erights.org/bin/win32/x86
     org.erights.e.elang.interp.Rune


If you're still having problems, please send me everything I'd need to 
reproduce this at my end. Thanks.

-- 
Text by me above is hereby placed in the public domain

     Cheers,
     --MarkM