[armedbear-devel] type mismatch for "asList"

Mark Evenson evenson at panix.com
Fri Aug 19 07:52:38 UTC 2011

On Aug 19, 2011, at 02:08 , Patrice Seyed wrote:

> Hello,
> With the following expression:
> (#"asList" 'Arrays "test")
> I get the error:
> Java exception 'SchemeException: java.lang.IllegalArgumentException: argument type mismatch
>   public static java.util.List java.util.Arrays.asList(java.lang.Object[])
>  called with ("test")'.
>    [Condition of type JAVA-EXCEPTION]

The Arrays.asList() method takes an array of java.lang.Object
("java.lang.Object[]") as a parameter, while you are passing it a
single String ("java.lang.String").

One way to convert the argument to a "java.lang.String[]", which
is a subtype of "java.lang.Object[]" therefore a valid parameter
to Arrays.asList() would be to use JAVA:AVA-ARRAY-FROM-LIST:

    CL-USER> (let ((array (jnew-array-from-list "java.lang.String" '("Test"))))
	       (#"asList" 'Arrays array))
    #<java.util.Arrays$ArrayList [Test] {13DA6112}> CL-USER>

"A screaming comes across the sky.  It has happened before, but there is nothing to compare to it now."

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