Add Python 3.9, Java 15, deprecate Java 14 (resolves #605)

containers/java/.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-# [Choice] Java version: 11, 14
+# [Choice] Java version: 11, 15
 ARG VARIANT=11
 FROM mcr.microsoft.com/vscode/devcontainers/java:${VARIANT}
 

containers/java/.devcontainer/base.Dockerfile

@@ -1,4 +1,4 @@
-# [Choice] Java version: 11, 14
+# [Choice] Java version: 11, 15
 ARG VARIANT=11
 FROM openjdk:${VARIANT}-jdk-buster
 

containers/java/.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 	"build": {
 		"dockerfile": "Dockerfile",
 		"args": {
-			// Update the VARIANT arg to pick a Java version: 11, 14
+			// Update the VARIANT arg to pick a Java version: 11, 15
 			"VARIANT": "11",
 			// Options
 			"INSTALL_MAVEN": "false",

containers/java/README.md

@@ -9,7 +9,7 @@
 | *Contributors* | The VS Code Java Team |
 | *Definition type* | Dockerfile |
 | *Published images* | mcr.microsoft.com/vscode/devcontainers/java |
-| *Available image variants* | 11, 14 |
+| *Available image variants* | 11, 15 |
 | *Published image architecture(s)* | x86-64 |
 | *Works in Codespaces* | Yes |
 | *Container host OS support* | Linux, macOS, Windows |
@@ -22,14 +22,14 @@
 While this definition should work unmodified, you can select the version of Java the container uses by updating the `VARIANT` arg in the included `devcontainer.json` (and rebuilding if you've already created the container).
 
 ```json
-"args": { "VARIANT": "14" }
+"args": { "VARIANT": "15" }
 ```
 
 You can also directly reference pre-built versions of `.devcontainer/base.Dockerfile` by using the `image` property in `.devcontainer/devcontainer.json` or updating the `FROM` statement in your own  `Dockerfile` to one of the following. An example `Dockerfile` is included in this repository.
 
 - `mcr.microsoft.com/vscode/devcontainers/java` (latest)
 - `mcr.microsoft.com/vscode/devcontainers/java:11`
-- `mcr.microsoft.com/vscode/devcontainers/java:14`
+- `mcr.microsoft.com/vscode/devcontainers/java:15`
 
 Version specific tags tied to [releases in this repository](https://github.com/microsoft/vscode-dev-containers/releases) are also available.
 

containers/java/definition-manifest.json

@@ -1,5 +1,5 @@
 {
-	"variants": [ "14", "11" ],
+	"variants": [ "15", "11" ],
 	"build": {
 		"latest": "true",
 		"rootDistro": "debian",

containers/python-3/.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-# [Choice] Python version: 3, 3.8, 3.7, 3.6
+# [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
 ARG VARIANT=3
 FROM mcr.microsoft.com/vscode/devcontainers/python:${VARIANT}
 

containers/python-3/.devcontainer/base.Dockerfile

@@ -1,4 +1,4 @@
-# [Choice] Python version: 3, 3.8, 3.7, 3.6
+# [Choice] Python version: 3, 3.9, 3.8, 3.7, 3.6
 ARG VARIANT=3
 FROM python:${VARIANT}
 

containers/python-3/.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
 		"dockerfile": "Dockerfile",
 		"context": "..",
 		"args": { 
-			// Update 'VARIANT' to pick a Python version: 3, 3.6, 3.7, 3.8 
+			// Update 'VARIANT' to pick a Python version: 3, 3.6, 3.7, 3.8, 3.9
 			"VARIANT": "3",
 			// Options
 			"INSTALL_NODE": "true",

containers/python-3/README.md

@@ -9,7 +9,7 @@
 | *Contributors* | The [VS Code Python extension](https://marketplace.visualstudio.com/itemdetails?itemName=ms-python.python) team |
 | *Definition type* | Dockerfile |
 | *Published image* | mcr.microsoft.com/vscode/devcontainers/python |
-| *Available image variants* | 3, 3.6, 3.7, 3.8 |
+| *Available image variants* | 3, 3.6, 3.7, 3.8, 3.9 |
 | *Published image architecture(s)* | x86-64 |
 | *Works in Codespaces* | Yes |
 | *Container Host OS Support* | Linux, macOS, Windows |
@@ -31,6 +31,7 @@ You can also directly reference pre-built versions of `.devcontainer/base.Docker
 - `mcr.microsoft.com/vscode/devcontainers/python:3.6`
 - `mcr.microsoft.com/vscode/devcontainers/python:3.7`
 - `mcr.microsoft.com/vscode/devcontainers/python:3.8`
+- `mcr.microsoft.com/vscode/devcontainers/python:3.9`
 
 Version specific tags tied to [releases in this repository](https://github.com/microsoft/vscode-dev-containers/releases) are also available.
 

containers/python-3/definition-manifest.json

@@ -1,5 +1,5 @@
 {
-	"variants": ["3", "3.8", "3.7", "3.6"],
+	"variants": ["3", "3.9", "3.8", "3.7", "3.6"],
 	"build": {
 		"latest": true,
 		"rootDistro": "debian",