Fix GitHub action for Java 15-ea.
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index d10c509..a97b6ec 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -27,7 +27,7 @@
         java: [ 8, 11, 14 ]
         experimental: [false]
         include:
-          - node: 15-ea
+          - java: 15-ea
             experimental: true        
         
     steps: