Check if a jdk is installed and set jdk_java_home accordingly. See https://support.d4science.org/issues/16607

smartgears/smartgears/tasks/main.yml

@@ -1,4 +1,5 @@
 ---
+- import_tasks: set_jdk_home.yml
 - import_tasks: smartgears-app.yml
 - import_tasks: data-transfer-service.yml
   when: data_transfer_service_install

smartgears/smartgears/tasks/set_jdk_home.yml

@@ -0,0 +1,63 @@
+---
+- block:
+  - name: Are we using the distribution OpenJDK?
+    stat: 
+      path: /usr/lib/jvm/java-{{ openjdk_default }}-openjdk-amd64
+    register: jdk_java_home_path
+    when: openjdk_default is defined
+
+  - debug:
+      msg: 'The jdk java home is {{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.path is defined
+
+  - name: Set the Java home when we are using the distribution OpenJDK
+    set_fact:
+      jdk_java_home: '{{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.isdir is defined and jdk_java_home_path.stat.isdir
+
+  when: jdk_java_home is not defined
+  tags: [ 'smartgears', 'smartgears_distribution', 'tomcat' ]
+
+- block:
+  - name: Are we using the Zulu OpenJDK?
+    stat:
+      path: /usr/lib/jvm/zulu-{{ openjdk_default }}-amd64
+    register: jdk_java_home_path
+    when: openjdk_default is defined
+
+  - debug:
+      msg: 'The jdk java home is {{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.path is defined
+
+  - name: Set the Java home when we are using the distribution OpenJDK
+    set_fact:
+      jdk_java_home: '{{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.isdir is defined and jdk_java_home_path.stat.isdir
+
+  when: jdk_java_home is not defined
+  tags: [ 'smartgears', 'smartgears_distribution', 'tomcat' ]
+
+- block:
+  - name: Are we using the Oracle JDK?
+    stat:
+      path: /usr/lib/jvm/java-{{ jdk_default }}-oracle
+    register: jdk_java_home_path
+    when: openjdk_default is not defined
+
+  - debug:
+      msg: 'The jdk java home is {{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.path is defined
+
+  - name: Set the Java home when we are using the Oracle JDK
+    set_fact:
+      jdk_java_home: '{{ jdk_java_home_path.stat.path }}'
+    when: jdk_java_home_path.stat.isdir is defined and jdk_java_home_path.stat.isdir
+
+  when: jdk_java_home is not defined
+  tags: [ 'smartgears', 'smartgears_distribution', 'tomcat' ]
+
+- name: Fail if we are not able to set the jdk_java_home variable
+  fail:
+    msg: 'No valid JDK installation found, failing!'
+  when: jdk_java_home is not defined
+  tags: [ 'smartgears', 'smartgears_distribution', 'tomcat' ]