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I am trying to generate a simple smart contract wrapper using solc and web3j in ubuntu.

I have downloaded the source as defined in https://docs.web3j.io/command_line.html

Release package can be obtained from https://github.com/web3j/web3j/releases/tag/v4.1.0.

I have download the source from https://github.com/web3j/web3j/archive/v4.1.0.zip

After unwrapping the zip package I can't find any bin directory as the document page shows

unzip web3j-<version>.zip
creating: web3j-3.0.0/lib/
inflating: web3j-3.0.0/lib/core-1.0.2-all.jarcreating: web3j-3.0.0/bin/
inflating: web3j-3.0.0/bin/web3j
inflating: web3j-3.0.0/bin/web3j.bat

How to get the bin directory?

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4.1.0 binary package is not attached yet in https://github.com/web3j/web3j/releases

I have to download package for 4.0.1 from https://github.com/web3j/web3j/releases/download/v4.0.1/web3j-4.0.1.tar

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First of all you need to install web3j, I consider you to use the version 3.5.0 because it's stable and reliable. Then you can generate your contract wrapper. It's very simple

$ web3j truffle generate [--javaTypes|--solidityTypes] /path/to/<truffle-smart-contract-output>.json -o /path/to/src/main/java -p com.your.organisation.name

Now you can just import your new generated package and use it's class. Remember to use web3j 3.5.0 in your gradle/maven project as well.

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