ABL allows arrays (called EXTENTs in ABL) to be passed as parameters. In the Java client, they are mapped to arrays where the base type is one of the JAVA proxy data types listed in INPUT parameters. For example, an ABL CHARACTER array is mapped to java.lang.String[ ]. An ABL INT64 array is mapped to the intrinsic type long[].

The size of an array is not part of its definition in Java, so the EXTENT value is not reflected in the Java proxy's parameter definition. If the extent of the data passed by the client does not match the extent of the parameter declaration of the ABL procedure, the proxy returns an error to the client at runtime.

ProxyGen indicates the EXTENT of the parameters (if any) in the comments of the proxy.