fix testspec.yaml

Author: khairulhabibataws

java-test-samples/java-appsync-sam/testspec.yml

@@ -9,6 +9,11 @@ phases:
       java: corretto11
     commands:
       - cd ./java-appsync-sam
+  pre_build:
+    commands:
+      - yum install java-17-amazon-corretto-devel -y
+      - alternatives --set java /usr/lib/jvm/java-17-amazon-corretto.x86_64/bin/java 
+      - export JAVA_HOME=/usr/lib/jvm/java-17-amazon-corretto.x86_64
   build:
     commands:
       - echo Build started on `date`