Conditions signaled when an argument that need to be a Java object is an instance of standard-java-object that does not have a jobject.
The condition class java-instance-without-jobject-error
is signaled when an argument that needs to be a Java object is an instance of standard-java-object that does not have a jobject.
You can use the java-bad-jobject readers java-bad-jobject-caller
and java-bad-jobject-object
on these conditions.
LispWorks User Guide and Reference Manual - 20 Sep 2017