If you have JAVA_HOME set, the java command should respect that (so the clojure script is correct to try to find java first, and then use JAVA_HOME only if java is not on the path):
(! 564)-> env | fgrep JAVA
JAVA_HOME=/Developer/jdk8u192-b12/Contents/Home
Tue Jun 18 10:34:10
(sean)-(jobs:0)-(/Developer/workspace/wsmain/build)
(! 565)-> env | fgrep JDK
OPENJDK8_HOME=/Developer/jdk8u192-b12/Contents/Home
OPENJDK11_HOME=/Developer/jdk-11.0.1.jdk/Contents/Home
Tue Jun 18 10:34:14
(sean)-(jobs:0)-(/Developer/workspace/wsmain/build)
(! 566)-> JAVA_HOME=$OPENJDK11_HOME java -version
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)
Tue Jun 18 10:34:32
(sean)-(jobs:0)-(/Developer/workspace/wsmain/build)
(! 567)-> java -version
openjdk version "1.8.0_192"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_192-b12)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.192-b12, mixed mode)
Tue Jun 18 10:34:37
(sean)-(jobs:0)-(/Developer/workspace/wsmain/build)
(! 568)->