Hi ebene,
uuugh this looks weird! Can't you resize it? I can't even set mine to that size. The Terminal should look like this:
Have you noticed other irregularities with your installation? There's maybe something broken. Never mind! Lets make it manually. Open a new Finder window and browse to the directory as shown on this picture (/Library/Java/Extensions)
Is the Extensions directory empty like on this picture? As next click onto the house and then Library. Is there a Java directory?