Checkbox java api

PS: You can try to debug how the internal Eclipse client API does this, if you want. However it is almost certainly not public API that you should use. The information is in the process configuration source.

I want to create a work item in java and pass the values for parameter, can not pass the checkbox

There is no parameter type checkbox. If you look into the types of the attributes and into the process configuration you will likely find something like boolean. Dependent on what type the attribute has, you have to pass the correct object e.g. a Boolean with a value.

Consider looking at the code in https://rsjazz.wordpress.com/2015/11/03/a-rtc-workitem-command-line-version-3-0/ or read the value of the attribute and check its type in the debugger or using Instanceof.