Official tutorials :

• Simple [Getting Started] tutorial : will guide you through calling OpenCL kernels with and without the JavaCLGenerator JavaCL Generator
• your first OpenCL Discrete Fourier Transform with JavaCL in 15 minutes : uses the old JNA version of JavaCL (see the MigratingFromJNAToBridJ migration page)

Blog entries :

• GSS MAHADEVAN'S blog
• JavaCL from within Processing 1.0
• GPGPU Mandelbrot with OpenCL and Java
• OpenCL4Java: Build high-performance OpenCL code with Java (and stay calm)
• ScalaCL: Reap OpenCL’s benefits without learning its syntax (Scala DSL for transparently parallel computations)