Is there a way to create a Java class with ABCL (that extends another class)?
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One can write directly write a Java class as JVM bytecode via the functions in the JVM package which is the code that ABCL's own compiler uses. As of abcl-0.25.0, there is unsupported code for a JAVA:JNEW-RUNTIME-CLASS method which allows one to dynamically write a Java class that calls Lisp methods for execution. The code uses classes from the ObjectWeb ASM BCEL which must be present in the JVM classpath. Exactly which version of the ASM BCEL library is needed, and whether it works with the current ABCL is untested. ABCL issue #153 tracks the work necessary to support this in the contemporary ABCL implementation.
But if one has an existing Java interface for which one would like to use Lisp based methods to provide an implementation, the process is considerably simpler (and supported!)
The relevant function is JAVA:JINTERFACE-IMPLEMENTATION whose use is demonstrated in the BankAccount example.
For the Java interface defined as
The following Lisp code creates a usable Java Proxy in the current JVM:
To get a reference to this implementation from Java, one uses the code in BankMainAccount.java