java.lang.ClassFormatError: Class name is empty or contains illegal character in descriptor

[pingouin21]

[JDK 21, abcl 1.9.2]

I'm trying to generate classes with jnew-runtime-class; sometimes it works, and sometimes it doesn't. The ClassFormatError is the one inexplicable issue I'm having; I can see the bytecode array in my debugger (Eclipse), but the MemoryClassLoader is failing to load it, failing at the point where it seems to be loading one of the interface classes (java.io.Serializable). Here is a stripped-down version of one of the classes:

(require :asdf)
(require :abcl-contrib)

(defun test2 ()
  (java:jnew-runtime-class
   "test2"
   :interfaces
   '("java.io.Serializable")
   :methods
   '(("postJson" :void ("java.lang.String")
      (lambda (this input)
	(if (null input)
	    (error "Null JSON input.")
	  (let* ()
	    (format t "Wrote input: ~a~%" input)))))
     ("selectAll" "java.lang.String" ("java.lang.String[]")
      (lambda (this args)
	(let ((connection (jcall "getConnection" this)))
	  "selectAll TBD")))
     ("select" "java.lang.String" ("java.util.String[]" "java.lang.String[]")
      (lambda (this args1 args2)
	"select TBD")))
   :fields '(("connection" "java.sql.Connection" :modifiers '(:private)))
   :class-loader (system::make-memory-class-loader)))

...and the stack trace:

CL-USER(2): (test2)
java.lang.ClassFormatError: Class name is empty or contains illegal character in descriptor in class file test2
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:889)
at org.armedbear.lisp.JavaClassLoader.defineLispClass(JavaClassLoader.java:186)
at org.armedbear.lisp.MemoryClassLoader.findClass(MemoryClassLoader.java:107)
at org.armedbear.lisp.MemoryClassLoader.loadClass(MemoryClassLoader.java:77)
at org.armedbear.lisp.JavaClassLoader.loadClass(JavaClassLoader.java:60)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.armedbear.lisp.Java.jcall(Java.java:958)
at org.armedbear.lisp.Java$pf_jcall.execute(Java.java:814)
at org.armedbear.lisp.Primitive.execute(Primitive.java:135)
at org.armedbear.lisp.Symbol.execute(Symbol.java:828)
at org.armedbear.lisp.LispThread.execute(LispThread.java:951)
at org.armedbear.lisp.runtime_class_2.execute(runtime-class.lisp:12)
at org.armedbear.lisp.LispThread.execute(LispThread.java:1098)
at org.armedbear.lisp.Lisp.evalCall(Lisp.java:755)
at org.armedbear.lisp.Lisp.eval(Lisp.java:603)
at org.armedbear.lisp.Lisp.eval(Lisp.java:601)
at org.armedbear.lisp.Lisp.progn(Lisp.java:824)
at org.armedbear.lisp.Primitives$sf_block.execute(Primitives.java:3752)
at org.armedbear.lisp.Lisp.eval(Lisp.java:579)
at org.armedbear.lisp.Lisp.progn(Lisp.java:824)
at org.armedbear.lisp.Closure.execute(Closure.java:220)
at org.armedbear.lisp.Closure.execute(Closure.java:142)
at org.armedbear.lisp.LispThread.execute(LispThread.java:892)
at org.armedbear.lisp.Lisp.evalCall(Lisp.java:641)
at org.armedbear.lisp.Lisp.eval(Lisp.java:603)
at org.armedbear.lisp.Primitives$pf__eval.execute(Primitives.java:346)
at org.armedbear.lisp.LispThread.execute(LispThread.java:910)
at org.armedbear.lisp.Lisp.evalCall(Lisp.java:652)
at org.armedbear.lisp.Lisp.eval(Lisp.java:603)
at org.armedbear.lisp.Lisp.progn(Lisp.java:824)
at org.armedbear.lisp.Primitives$sf_block.execute(Primitives.java:3752)
at org.armedbear.lisp.Lisp.eval(Lisp.java:579)
at org.armedbear.lisp.Lisp.progn(Lisp.java:824)
at org.armedbear.lisp.Closure.execute(Closure.java:220)
at org.armedbear.lisp.Closure.execute(Closure.java:148)
at org.armedbear.lisp.LispThread.execute(LispThread.java:910)
at org.armedbear.lisp.Lisp$1.execute(Lisp.java:288)
at org.armedbear.lisp.Symbol.execute(Symbol.java:805)
at org.armedbear.lisp.LispThread.execute(LispThread.java:910)
at org.armedbear.lisp.top_level_47.execute(top-level.lisp:407)
at org.armedbear.lisp.CompiledClosure.execute(CompiledClosure.java:89)
at org.armedbear.lisp.Symbol.execute(Symbol.java:795)
at org.armedbear.lisp.LispThread.execute(LispThread.java:892)
at org.armedbear.lisp.top_level_48.execute(top-level.lisp:415)
at org.armedbear.lisp.LispThread.execute(LispThread.java:892)
at org.armedbear.lisp.Interpreter.run(Interpreter.java:361)
at org.armedbear.lisp.Main$1.run(Main.java:48)
at java.base/java.lang.Thread.run(Thread.java:1583)
#<THREAD "interpreter" native {6629C9F7}>: Debugger invoked on condition of type JAVA-EXCEPTION
Java exception 'java.lang.ClassNotFoundException: Function class not found: test2'.

[pingouin21]

More info: the bytecode is valid...

[-54, -2, -70, -66, 0, 0, 0, 49, 0, 58, 1, 0, 29, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 74, 97, 118, 97, 79, 98, 106, 101, 99, 116, 7, 0, 1, 1, 0, 11, 103, 101, 116, 73, 110, 115, 116, 97, 110, 99, 101, 1, 0, 52, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 59, 90, 41, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 12, 0, 3, 0, 4, 10, 0, 2, 0, 5, 1, 0, 5, 116, 101, 115, 116, 50, 7, 0, 7, 1, 0, 11, 112, 111, 115, 116, 74, 115, 111, 110, 49, 51, 57, 1, 0, 31, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 12, 0, 9, 0, 10, 9, 0, 8, 0, 11, 1, 0, 29, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 7, 0, 13, 1, 0, 7, 101, 120, 101, 99, 117, 116, 101, 1, 0, 95, 40, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 41, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 12, 0, 15, 0, 16, 10, 0, 14, 0, 17, 1, 0, 12, 115, 101, 108, 101, 99, 116, 65, 108, 108, 50, 48, 50, 12, 0, 19, 0, 10, 9, 0, 8, 0, 20, 1, 0, 16, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 7, 0, 22, 1, 0, 12, 106, 97, 118, 97, 73, 110, 115, 116, 97, 110, 99, 101, 1, 0, 37, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 67, 108, 97, 115, 115, 59, 41, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 59, 12, 0, 24, 0, 25, 10, 0, 14, 0, 26, 1, 0, 9, 115, 101, 108, 101, 99, 116, 50, 48, 51, 12, 0, 28, 0, 10, 9, 0, 8, 0, 29, 1, 0, 126, 40, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 41, 76, 111, 114, 103, 47, 97, 114, 109, 101, 100, 98, 101, 97, 114, 47, 108, 105, 115, 112, 47, 76, 105, 115, 112, 79, 98, 106, 101, 99, 116, 59, 12, 0, 15, 0, 31, 10, 0, 14, 0, 32, 7, 0, 22, 1, 0, 10, 99, 111, 110, 110, 101, 99, 116, 105, 111, 110, 1, 0, 21, 76, 106, 97, 118, 97, 47, 115, 113, 108, 47, 67, 111, 110, 110, 101, 99, 116, 105, 111, 110, 59, 12, 0, 35, 0, 36, 9, 0, 8, 0, 37, 1, 0, 16, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 7, 0, 39, 1, 0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 12, 0, 41, 0, 42, 10, 0, 40, 0, 43, 1, 0, 20, 106, 97, 118, 97, 47, 105, 111, 47, 83, 101, 114, 105, 97, 108, 105, 122, 97, 98, 108, 101, 7, 0, 45, 1, 0, 4, 67, 111, 100, 101, 1, 0, 24, 40, 76, 106, 97, 118, 97, 47, 115, 113, 108, 47, 67, 111, 110, 110, 101, 99, 116, 105, 111, 110, 59, 41, 86, 1, 0, 13, 115, 101, 116, 67, 111, 110, 110, 101, 99, 116, 105, 111, 110, 1, 0, 23, 40, 41, 76, 106, 97, 118, 97, 47, 115, 113, 108, 47, 67, 111, 110, 110, 101, 99, 116, 105, 111, 110, 59, 1, 0, 13, 103, 101, 116, 67, 111, 110, 110, 101, 99, 116, 105, 111, 110, 1, 0, 60, 40, 76, 106, 97, 118, 97, 47, 117, 116, 105, 108, 47, 83, 116, 114, 105, 110, 103, 91, 93, 59, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 91, 93, 59, 41, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 6, 115, 101, 108, 101, 99, 116, 1, 0, 40, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 91, 93, 59, 41, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 9, 115, 101, 108, 101, 99, 116, 65, 108, 108, 1, 0, 21, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 1, 0, 8, 112, 111, 115, 116, 74, 115, 111, 110, 0, 1, 0, 8, 0, 40, 0, 1, 0, 46, 0, 4, 0, 0, 0, 35, 0, 36, 0, 0, 0, 9, 0, 28, 0, 10, 0, 0, 0, 9, 0, 19, 0, 10, 0, 0, 0, 9, 0, 9, 0, 10, 0, 0, 0, 6, 0, 1, 0, 41, 0, 42, 0, 1, 0, 47, 0, 0, 0, 17, 0, 1, 0, 1, 0, 0, 0, 5, 42, -73, 0, 44, -79, 0, 0, 0, 0, 0, 1, 0, 49, 0, 48, 0, 1, 0, 47, 0, 0, 0, 18, 0, 2, 0, 2, 0, 0, 0, 6, 42, 43, -75, 0, 38, -79, 0, 0, 0, 0, 0, 1, 0, 51, 0, 50, 0, 1, 0, 47, 0, 0, 0, 17, 0, 1, 0, 1, 0, 0, 0, 5, 42, -76, 0, 38, -80, 0, 0, 0, 0, 0, 1, 0, 53, 0, 52, 0, 1, 0, 47, 0, 0, 0, 53, 0, 4, 0, 6, 0, 0, 0, 41, 42, 4, -72, 0, 6, 78, 43, 4, -72, 0, 6, 58, 4, 44, 4, -72, 0, 6, 58, 5, -78, 0, 30, 45, 25, 4, 25, 5, -74, 0, 33, 19, 0, 34, -74, 0, 27, -64, 0, 34, -80, 0, 0, 0, 0, 0, 1, 0, 55, 0, 54, 0, 1, 0, 47, 0, 0, 0, 42, 0, 3, 0, 4, 0, 0, 0, 30, 42, 4, -72, 0, 6, 77, 43, 4, -72, 0, 6, 78, -78, 0, 21, 44, 45, -74, 0, 18, 19, 0, 23, -74, 0, 27, -64, 0, 23, -80, 0, 0, 0, 0, 0, 1, 0, 57, 0, 56, 0, 1, 0, 47, 0, 0, 0, 34, 0, 3, 0, 4, 0, 0, 0, 22, 42, 4, -72, 0, 6, 77, 43, 4, -72, 0, 6, 78, -78, 0, 12, 44, 45, -74, 0, 18, 87, -79, 0, 0, 0, 0, 0, 0]

The analysis correctly identifies it...
Classname: test2
Superclass: java/lang/Object
Implements: java/io/Serializable
Field: connection (java.sql.Connection)
Methods: , setConnection, getConnection, select, selectAll, postJson

[pingouin21]

Also: I see a bug on my part...

("select" "java.lang.String" ("java.util.String[]" "java.lang.String[]")

But fixing that, either as "java.util.List" or "java.lang.String[]", does not change the outcome.

[easye]

• What values does (list-implementation-version) return for the failing process?

[easye]

Confirmed as failing for me on

CL-USER> (lisp-implementation-version)
"1.9.3-dev"
"OpenJDK_64-Bit_Server_VM-MacPorts-25.0.4.1+1"
"aarch64-Mac_OS_X-15.7.9"

which is unexpected because https://github.com/armedbear/abcl/blob/master/t/runtime-class.lisp works ok.

I'll have to do more digging when I get a chance. Thanks for the bug report.

[pingouin21]

I've got it working, but only by using non-array arg types. Is there a way to express "java.lang.String[]" in a way that works for a method arg-type declaration in jnew-runtime-class?

Also:

CL-USER(8): (lisp-implementation-version)
"1.9.2"
"Java_HotSpot(TM)_64-Bit_Server_VM-Oracle_Corporation-21.0.11+9-LTS-211"
"amd64-Linux-4.18.0-553.148.1.el8_10.x86_64"