Split package errors

[bendemott]

When trying to compile with Java 9, I get split package errors the moment I import kerb4j

error: the unnamed module reads package com.kerb4j.client from both kerb4j.client and kerb4j.common
error: the unnamed module reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java8 and kerb4j.base64.common
error: the unnamed module reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java8 and kerb4j.base64.java7
error: module kerb4j.base64.java7 reads package com.kerb4j.client from both kerb4j.common and kerb4j.client
error: module kerb4j.base64.java7 reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.common
error: module kerb4j.base64.java7 reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.java8
error: module kerb4j.base64.java8 reads package com.kerb4j.client from both kerb4j.common and kerb4j.client
error: module kerb4j.base64.java8 reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.common
error: module kerb4j.base64.java8 reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.java8
error: module kerb4j.base64.common reads package com.kerb4j.client from both kerb4j.common and kerb4j.client
error: module kerb4j.base64.common reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.common
error: module kerb4j.base64.common reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.java8
error: module kerb4j.client reads package com.kerb4j.client from both kerb4j.common and kerb4j.client
error: module kerb4j.client reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.common
error: module kerb4j.client reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.java8
error: module kerb4j.common reads package com.kerb4j.client from both kerb4j.client and kerb4j.common
error: module kerb4j.common reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.common
error: module kerb4j.common reads package com.kerb4j.common.util.base64 from both kerb4j.base64.java7 and kerb4j.base64.java8