Update Spring Boot to 2.7.7 (knative#1502)

* Update Spring Boot to 2.7.7

- also add function-template springboot.md doc

Signed-off-by: Thomas Risberg <trisberg@pivotal.io>

* Fix lint errors

Signed-off-by: Thomas Risberg <trisberg@pivotal.io>

docs/function-templates/springboot.md

@@ -0,0 +1,88 @@
+# Spring Boot Function Developer's Guide
+
+When creating a Spring Boot function using the `func` CLI, the project
+directory looks like a typical Boot project.
+To create a HTTP function that echos the input run the following command:
+
+```
+❯ func create -l springboot fn
+```
+
+This is the HTTP function template structure:
+
+```
+Project path: /home/developer/projects/fn
+Function name: fn
+Language Runtime: springboot
+Template: http
+
+❯ tree
+fn
+├── func.yaml
+├── mvnw
+├── mvnw.cmd
+├── pom.xml
+├── README.md
+└── src
+    ├── main
+    │   ├── java
+    │   │   └── functions
+    │   │       └── CloudFunctionApplication.java
+    │   └── resources
+    │       └── application.properties
+    └── test
+        └── java
+            └── functions
+                └── EchoCaseFunctionTest.java
+```
+
+This is a full-featured, self-contained Spring Boot application that uses [Spring Cloud Function](https://spring.io/projects/spring-cloud-function) and [Spring WebFlux](https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html) web framework to listen for HTTP requests on port 8080.
+
+See the generated [README.md](../../templates/springboot/http/README.md) for
+details on building, testing, and deploying the HTTP app.
+
+You may have noticed the `func.yaml` file. This is a configuration
+file used by `func` to deploy your project as a service in your
+kubernetes cluster.
+
+For an event-triggered function, pass the `-t cloudevents` option to
+generate an app capable of responding to
+[CloudEvents](https://cloudevents.io):
+
+```
+❯ func create -l springboot -t cloudevents fn
+```
+
+A CloudEvent function have a similar template structure to the above HTTP function:
+
+```
+Project path: /home/developer/projects/fn
+Function name: fn
+Language Runtime: springboot
+Template: cloudevents
+
+❯ tree
+fn
+├── func.yaml
+├── mvnw
+├── mvnw.cmd
+├── pom.xml
+├── README.md
+└── src
+    ├── main
+    │   ├── java
+    │   │   └── echo
+    │   │       ├── EchoFunction.java
+    │   │       └── SpringCloudEventsApplication.java
+    │   └── resources
+    │       └── application.properties
+    └── test
+        └── java
+            └── echo
+                └── SpringCloudEventsApplicationTests.java
+```
+
+The handlers of each app differ slightly. See its generated
+[README.md](../../templates/springboot/cloudevents/README.md) for more details.
+
+Have fun!

templates/springboot/cloudevents/README.md

@@ -60,6 +60,17 @@ This command will build and deploy the function into cluster.
 func deploy -v # also triggers build
 ```
 
+### For ARM processor based systems
+
+Building Spring Boot apps with Paketo Buildpacks on an ARM processor based system, like an Apple Macbook with an M1 or M2 chip, doesn't work well at the moment.
+To work around this you can build the image on your local system using [Jib](https://github.com/GoogleContainerTools/jib).
+Then, you would deploy the Jib generated image.
+
+```
+./mvnw compile com.google.cloud.tools:jib-maven-plugin:3.3.1:dockerBuild -Dimage=$FUNC_REGISTRY/echo
+func deploy --build=false --image=$FUNC_REGISTRY/echo
+```
+
 ## Function invocation
 
 Spring Cloud Functions allows you to route CloudEvents to specific functions using the `Ce-Type` attribute.

templates/springboot/cloudevents/pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.7.1</version>
+    <version>2.7.7</version>
     <relativePath/>
   </parent>
 
@@ -18,9 +18,9 @@
 
   <properties>
     <java.version>11</java.version>
-    <spring-cloud.version>2021.0.3</spring-cloud.version>
-    <spring-native.version>0.12.1</spring-native.version>
-    <compiler-plugin.version>3.8.1</compiler-plugin.version>
+    <spring-cloud.version>2021.0.5</spring-cloud.version>
+    <spring-native.version>0.12.2</spring-native.version>
+    <compiler-plugin.version>3.10.1</compiler-plugin.version>
     <maven.compiler.parameters>true</maven.compiler.parameters>
     <maven.compiler.source>11</maven.compiler.source>
     <maven.compiler.target>11</maven.compiler.target>
@@ -128,7 +128,7 @@
       <id>native</id>
       <properties>
         <repackage.classifier>exec</repackage.classifier>
-        <native-buildtools.version>0.9.11</native-buildtools.version>
+        <native-buildtools.version>0.9.12</native-buildtools.version>
       </properties>
       <dependencies>
         <dependency>

templates/springboot/http/README.md

@@ -60,6 +60,17 @@ This command will build and deploy the function into cluster.
 func deploy -v # also triggers build
 ```
 
+### For ARM processor based systems
+
+Building Spring Boot apps with Paketo Buildpacks on an ARM processor based system, like an Apple Macbook with an M1 or M2 chip, doesn't work well at the moment.
+To work around this you can build the image on your local system using [Jib](https://github.com/GoogleContainerTools/jib).
+Then, you would deploy the Jib generated image.
+
+```
+./mvnw compile com.google.cloud.tools:jib-maven-plugin:3.3.1:dockerBuild -Dimage=$FUNC_REGISTRY/echo
+func deploy --build=false --image=$FUNC_REGISTRY/echo
+```
+
 ## Function invocation
 
 For the examples below, please be sure to set the `URL` variable to the route of your function.

templates/springboot/http/pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.7.1</version>
+    <version>2.7.7</version>
     <relativePath/>
   </parent>
 
@@ -18,9 +18,9 @@
 
   <properties>
     <java.version>11</java.version>
-    <spring-cloud.version>2021.0.3</spring-cloud.version>
-    <spring-native.version>0.12.1</spring-native.version>
-    <compiler-plugin.version>3.8.1</compiler-plugin.version>
+    <spring-cloud.version>2021.0.5</spring-cloud.version>
+    <spring-native.version>0.12.2</spring-native.version>
+    <compiler-plugin.version>3.10.1</compiler-plugin.version>
     <maven.compiler.parameters>true</maven.compiler.parameters>
     <maven.compiler.source>11</maven.compiler.source>
     <maven.compiler.target>11</maven.compiler.target>
@@ -128,7 +128,7 @@
       <id>native</id>
       <properties>
         <repackage.classifier>exec</repackage.classifier>
-        <native-buildtools.version>0.9.11</native-buildtools.version>
+        <native-buildtools.version>0.9.12</native-buildtools.version>
       </properties>
       <dependencies>
         <dependency>