libj is a cross-platform native runtime library equipped with Java/JavaScript-like API.

git clone --recursive https://github.com/plenluno/libj.git
mkdir libj/build
cd libj/build
cmake ..
make

The memory management of libj is automatic, based on either shared_ptr or bdw-gc.
libj uses shared_ptr by default. In order to use bdw-gc,

cmake -DLIBJ_USE_BDWGC=ON ..

The following option allows you to use thread-related classes and concurrent collection classes.

cmake -DLIBJ_USE_THREAD=ON ..