What don't you get? You simply have to replace the following line:
by
However, you don't have to rebuild Java3D to benefit of this fix, you just have to use the fat JAR above at runtime instead of JOGL 2.3.2 fat JAR until we release another version.
My instructions are very detailed, I can't make them easier, all steps are mentioned to build Java3D in command line.
What do you mean by "don't know how to add it to the java library"? You have to strictly follow my instructions with the required tools, I won't provide alternative build instructions for each IDE, the build is based on Ant.