You can create custom object:

To implement custom business logic in your own models, create custom function or task type.
To add components for your UI or Forms.

When implementing custom objects in Java, you can pass model objects as parameter arguments to custom objects or access model objects via the context parameter or another object; For example, you can pass a record as an argument to your java method and then access its related records.

To work with object of Expression-Language data types in Java, use their implementing Java class.

Expression Language Type	Class
String	java.lang.String
Boolean	java.lang.Boolean
Binary	com.whitestein.lsps.lang.exec.BinaryHolder
Decimal	com.whitestein.lsps.lang.Decimal
Integer	com.whitestein.lsps.lang.Decimal
Date	java.util.Date
Reference	com.whitestein.lsps.lang.exec.ReferenceHolder
Collection	com.whitestein.lsps.lang.exec.CollectionHolder
List	com.whitestein.lsps.lang.exec.ListHolder
Set	com.whitestein.lsps.lang.exec.SetHolder
Type	com.whitestein.lsps.lang.type.Type
Map	com.whitestein.lsps.lang.exec.MapHolder
Closure	com.whitestein.lsps.lang.exec.ClosureHolder
Record	com.whitestein.lsps.lang.exec.RecordHolder
Enumeration	com.whitestein.lsps.lang.exec.EnumerationImpl
Property	com.whitestein.lsps.lang.exec.Property
Object	java.lang.Object