Solidity multidimensional array as return

[ismoli]

Bug_title

Impossible to call Solidity function that returns 2d array from contract

Steps To Reproduce

Simple solidity function: function get() view external returns (uint128[][] memory) {...} Generate wrapper, or construct ethCall manually.

Expected behavior

Function should be called successfully and return result

Actual behavior

Exception occurred

java.lang.UnsupportedOperationException: Unable to access parameterized type org.web3j.abi.datatypes.DynamicArray<org.web3j.abi.datatypes.DynamicArray<org.web3j.abi.datatypes.generated.Uint128>>

	at org.web3j.abi.TypeDecoder.decodeArrayElements(TypeDecoder.java:694)
	at org.web3j.abi.TypeDecoder.decodeDynamicArray(TypeDecoder.java:442)
	at org.web3j.abi.DefaultFunctionReturnDecoder.build(DefaultFunctionReturnDecoder.java:100)
	at org.web3j.abi.DefaultFunctionReturnDecoder.decodeFunctionResult(DefaultFunctionReturnDecoder.java:52)
	at org.web3j.abi.FunctionReturnDecoder.decode(FunctionReturnDecoder.java:57)
	at org.web3j.tx.Contract.executeCall(Contract.java:313)
	at org.web3j.tx.Contract.executeCallMultipleValueReturn(Contract.java:357)

Environment

Web3j version 4.9.8

Additional context

So generated code is using new TypeReference<DynamicArray<DynamicArray<Uint128>>>() {} as output value which seems like not really working.

Is there any workaround? When constructing a call manually (as opposed to generating wrapper), what should I set for Types to 'Output parameters' to make it work?