Aside - Type Mapping Reference

Lua Type	Java Type
nil	null
number	byte, short, int, long, float, double, Byte, Short, Int, Long, Float, Double [1]
boolean	boolean, Boolean
string	String
function	instance [2]
table	See Source code[3]
userdata	instance, Class, EClass [4]

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1. If a number greater than the max size of the Java type is provided, it overflows, wrapping around. (ex. if passing 256 where a byte is expected, the resulting byte will be 0) ↩︎

2. When going from Lua to Java, converted to an instance of a functional interface (java interface with only one method), where applicable. see Callback Methods ↩︎

3. When going from Java to Lua, converted only if the java method's return value is annotated with @CoerceToNative. When going from Lua to Java, converted unconditionally. ↩︎

4. Java classes and objects are wrapped as userdata. Additionally, where a Class or EClass are expected, a userdata passed directly from require can be used. ↩︎