For some matrices, there are multiple solutions. It's unclear how to choose between them. For example:

X S X
. X .
X G X

has two solutions with the same path length. How do you choose between them?

There is a small issue with the default test: Assert.assertEquals should be simply assertEquals.

There's a typo in the solution template for java - ouor should be "your"

The description should mention how null input should be handled.

This doesn't work - try {'n', 'w', 'n', 'w', 'n', 'w', 'n', 'w', 'n', 'w'} as input.