Provide preference mapping for Java Execution Environments -> Runtimes

Signed-off-by: Snjezana Peco <snjezana.peco@redhat.com>

Author: snjeza

README.md

@@ -125,6 +125,7 @@ The following settings are supported:
 
 New in 0.56.0:
 * `java.import.gradle.offline.enabled`: Enable/disable the Gradle offline mode. Defaults to `false`.
+* `java.configuration.runtimes`: Java Execution Environments.
 
 Troubleshooting
 ===============

package.json

@@ -444,6 +444,55 @@
           "description": "Automatically show build status on startup.",
           "default": false,
           "scope": "window"
+        },
+        "java.configuration.runtimes": {
+          "type": "array",
+          "label": "Java Execution Environments.",
+          "items": {
+            "type": "object",
+            "default": {},
+            "required": [
+              "path",
+              "name"
+            ],
+            "properties": {
+              "name": {
+                "type": "string",
+                "enum": [
+                  "J2SE-1.5",
+                  "JavaSE-1.6",
+                  "JavaSE-1.7",
+                  "JavaSE-1.8",
+                  "JavaSE-9",
+                  "JavaSE-10",
+                  "JavaSE-11",
+                  "JavaSE-12",
+                  "JavaSE-13"
+                ],
+                "label": "Java Execution Environment name. Must be unique"
+              },
+              "path": {
+                "type": "string",
+                "label": "JDK path.\nOn Windows, backslashes must be escaped, i.e.\n\"path\":\"C:\\\\Program Files\\\\Java\\\\jdk1.8.0_161\""
+              },
+              "sources": {
+                "type": "string",
+                "label": "JDK sources."
+              },
+              "javadoc": {
+                "type": "string",
+                "label": "JDK javadoc."
+              },
+              "default": {
+                "type": "boolean",
+                "label": "Is default runtime? Only one runtime can be default."
+              }
+            },
+            "additionalProperties": false
+          },
+          "default": [],
+          "description": "Java Execution Environments -> Runtimes.",
+          "scope": "machine"
         }
       }
     },