Hello (again), I am trying to invoke java code from lisp code following http://common-lisp.net/project/armedbear/doc/abcl-user.html. Here is the code I am trying to run:
CL-USER> (defun java-format (fmtstring &rest args) (let* ((string-class (jclass "java.lang.String")) (array-of-objs (jclass "[Ljava.lang.Object;")) (method (jmethod string-class "format" string-class array-of-objs))) (jcall method fmtstring args)))
JAVA-FORMAT
And here is what I got when I try to run it:
(java-format "" "%d %08.d %s" 1 2 3)
Wrong number of arguments for public static java.lang.String java.lang.String.format(java.lang.String,java.lang.Object[]): expected 2, got 1 [Condition of type PROGRAM-ERROR]
Restarts: 0: [RETRY] Retry SLIME REPL evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [ABORT] Abort thread.
Backtrace: 0: (#<FUNCTION {53C470B}> #<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>) 1: (APPLY #<FUNCTION {53C470B}> (#<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>)) 2: (SYSTEM::RUN-HOOK SYSTEM::*INVOKE-DEBUGGER-HOOK* #<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>) 3: (INVOKE-DEBUGGER #<PROGRAM-ERROR {76F2D004}>) 4: org.armedbear.lisp.Lisp.error(Lisp.java:381) 5: org.armedbear.lisp.Java.jcall(Java.java:880) 6: org.armedbear.lisp.Java$pf_jcall.execute(Java.java:755) 7: org.armedbear.lisp.Primitive.execute(Primitive.java:135) 8: (JCALL #<java.lang.reflect.Method public static java.lang.String j.... {451CF2D}> "" ("%d %08.d %s" 1 2 3)) 9: (JAVA-FORMAT "" "%d %08.d %s" 1 2 3) 10: (SYSTEM::%EVAL (JAVA-FORMAT "" "%d %08.d %s" 1 2 3)) 11: (EVAL (JAVA-FORMAT "" "%d %08.d %s" 1 2 3)) --more--
What am I doing wrong ?
Arnaud
OK. I can see where my first error lies: jcall parameters are incorrect. Here is a corrected version:
(defun java-format (fmtstring &rest args) (let* ((string-class (jclass "java.lang.String")) (array-of-objs (jclass "[Ljava.lang.Object;")) (method (jmethod string-class "format" string-class array-of-objs))) (jcall method nil fmtstring args)))
But this does not work yet as I do not know how to convert a lisp list to a java array. IS there any utility function or should I do it "by hand" ?
Arnaud
On Thu, Apr 5, 2012 at 4:12 PM, Arnaud Bailly arnaud.oqube@gmail.com wrote:
Hello (again), I am trying to invoke java code from lisp code following http://common-lisp.net/project/armedbear/doc/abcl-user.html. Here is the code I am trying to run:
CL-USER> (defun java-format (fmtstring &rest args) (let* ((string-class (jclass "java.lang.String")) (array-of-objs (jclass "[Ljava.lang.Object;")) (method (jmethod string-class "format" string-class array-of-objs))) (jcall method fmtstring args)))
JAVA-FORMAT
And here is what I got when I try to run it:
(java-format "" "%d %08.d %s" 1 2 3)
Wrong number of arguments for public static java.lang.String java.lang.String.format(java.lang.String,java.lang.Object[]): expected 2, got 1 [Condition of type PROGRAM-ERROR]
Restarts: 0: [RETRY] Retry SLIME REPL evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [ABORT] Abort thread.
Backtrace: 0: (#<FUNCTION {53C470B}> #<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>) 1: (APPLY #<FUNCTION {53C470B}> (#<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>)) 2: (SYSTEM::RUN-HOOK SYSTEM::*INVOKE-DEBUGGER-HOOK* #<PROGRAM-ERROR {76F2D004}> #<FUNCTION {53C470B}>) 3: (INVOKE-DEBUGGER #<PROGRAM-ERROR {76F2D004}>) 4: org.armedbear.lisp.Lisp.error(Lisp.java:381) 5: org.armedbear.lisp.Java.jcall(Java.java:880) 6: org.armedbear.lisp.Java$pf_jcall.execute(Java.java:755) 7: org.armedbear.lisp.Primitive.execute(Primitive.java:135) 8: (JCALL #<java.lang.reflect.Method public static java.lang.String j.... {451CF2D}> "" ("%d %08.d %s" 1 2 3)) 9: (JAVA-FORMAT "" "%d %08.d %s" 1 2 3) 10: (SYSTEM::%EVAL (JAVA-FORMAT "" "%d %08.d %s" 1 2 3)) 11: (EVAL (JAVA-FORMAT "" "%d %08.d %s" 1 2 3)) --more--
What am I doing wrong ?
Arnaud
On Apr 5, 2012, at 4:34 PM, Arnaud Bailly wrote:
OK. I can see where my first error lies: jcall parameters are incorrect. Here is a corrected version:
(defun java-format (fmtstring &rest args) (let* ((string-class (jclass "java.lang.String")) (array-of-objs (jclass "[Ljava.lang.Object;")) (method (jmethod string-class "format" string-class array-of-objs))) (jcall method nil fmtstring args)))
But this does not work yet as I do not know how to convert a lisp list to a java array. IS there any utility function or should I do it "by hand" ?
JAVA:JNEW-ARRAY-FROM-LIST should be what you want.
-- "A screaming comes across the sky. It has happened before, but there is nothing to compare to it now."
armedbear-devel@common-lisp.net
-
Arnaud Bailly -
Mark Evenson