Helidon 2.x examples (helidon-io#39)

* Helidon 2 examples
* Use Java 11
* Fix project versions
* Fix copyright
* Add suppressions for Helidon 2 examples
* Use v4 of github actions

.github/workflows/validate.yml

@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Download Maven Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: io-helidon-maven-artifacts
           path: ~/.m2/repository/io/helidon
@@ -82,7 +82,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Download Maven Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: io-helidon-maven-artifacts
           path: ~/.m2/repository/io/helidon
@@ -104,7 +104,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Download Maven Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: io-helidon-maven-artifacts
           path: ~/.m2/repository/io/helidon

README.md

@@ -1,23 +1,23 @@
 
 # Helidon Examples
 
-Examples for Helidon 3.
+Examples for Helidon 2.
 
 [Helidon 4 Examples](https://github.com/helidon-io/helidon/tree/main/examples) and [Helidon 2 Examples](https://github.com/helidon-io/helidon/tree/helidon-2.x/examples) are in the primary Helidon repository.
 
 ## How to Run
 
-To build and run Helidon 3 examples you need:
+To build and run Helidon 2 examples you need:
 
-* Java 17 or later
+* Java 11 or later
 * Maven 3.6.1 or later
 
 Then:
 
 ```
 git clone https://github.com/helidon-io/helidon-examples.git
 cd helidon-examples
-git checkout helidon-3.x
+git checkout helidon-2.x
 mvn clean install
 ```
 
@@ -26,22 +26,24 @@ mvn clean install
 | Branch        | Description |
 | ------------- |-------------|
 | helidon-3.x   | Examples for the current release of Helidon 3 |
+| helidon-2.x   | Examples for the current release of Helidon 2 |
 | dev-3.x       | Development branch for Helidon 3 release currently under development |
+| dev-2.x       | Development branch for Helidon 2 release currently under development |
 
 | Tags          | Description |
 | ------------- |-------------|
 | N.N.N         | Examples for a specific version of Helion |
 
-To checkout examples for the most recent release of Helidon 3:
+To checkout examples for the most recent release of Helidon 2:
 
 ```
-git checkout helidon-3.x
+git checkout helidon-2.x
 ```
 
 To checkout examples for a specific release of Helidon:
 
 ```
-git checkout tags/3.2.5
+git checkout tags/2.X.Y
 ```
 
 ## Documentation

etc/checkstyle-suppressions.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!--
 
-    Copyright (c) 2016, 2023 Oracle and/or its affiliates.
+    Copyright (c) 2016, 2024 Oracle and/or its affiliates.
 
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@
         "http://checkstyle.sourceforge.net/dtds/suppressions_1_1.dtd">
 
 <suppressions>
-    <!-- Code generated by openapi tools -->
+    <!-- Java comments, import order and style of the files should be generated by OpenApi Tools. -->
     <suppress checks="ConstantName"
               files="examples/openapi-tools/"/>
     <suppress checks="ImportOrder"
@@ -43,4 +43,18 @@
               files="examples/openapi-tools/"/>
     <suppress checks="HideUtilityClassConstructor"
               files="examples/openapi-tools/"/>
+
+    <suppress checks="UnusedImports"
+              files="examples/openapi-tools/"/>
+    <suppress checks="JavadocPackage"
+              files="examples/openapi-tools/"/>
+    <suppress checks="AvoidStarImport"
+              files="examples/openapi-tools/"/>
+    <suppress checks="WhitespaceAround"
+              files="examples/openapi-tools/"/>
+    <suppress checks="LineLength"
+              files="examples/openapi-tools/"/>
+    <suppress checks="MethodParamPad"
+              files="examples/openapi-tools/"/>
+
 </suppressions>

examples/README.md

@@ -0,0 +1,38 @@
+<p align="center">
+    <img src="../etc/images/Primary_logo_blue.png" height="180">
+</p>
+
+# Helidon Examples
+
+Welcome to the Helidon Examples! If this is your first experience with
+Helidon we recommend you start with our
+[quickstart](https://helidon.io/docs/v2/#/about/03_prerequisites)
+That will quickly get you going with your first Helidon application.
+
+After that you can come back here and dig into the examples. 
+
+Our examples are Maven projects and can be built and run with
+Java 11 or newer -- so make sure you have those:
+
+```
+java -version
+mvn -version
+```
+
+# Building an Example
+
+Each example has a `README` that you will follow. To build most examples
+just `cd` to the directory and run `mvn package`:
+
+```
+cd examples/microprofile/hello-world-explicit
+mvn package
+```
+
+Usually the example will produce an application jar file that you can run:
+
+```
+java -jar target/example-name.jar
+```
+
+But always see the example's `README` for details.

examples/config/README.md

@@ -0,0 +1,5 @@
+
+# Helidon SE Config Examples
+
+Each subdirectory contains example code that highlights specific aspects of
+Helidon configuration.

examples/config/basics/README.md

@@ -0,0 +1,16 @@
+# Helidon Config Basic Example
+
+This example shows the basics of using Helidon SE Config. The
+[Main.java](./src/main/java/io/helidon/config/examples/basics/Main.java) class shows:
+
+* loading configuration from a resource 
+[`application.conf`](./src/main/resources/application.conf) on the classpath 
+containing config in HOCON (Human-Optimized Config Object Notation) format
+* getting configuration values of various types
+
+## Build and run
+
+```shell
+mvn package
+java -jar target/helidon-examples-config-basics.jar
+```

examples/config/basics/pom.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2017, 2024 Oracle and/or its affiliates.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>io.helidon.applications</groupId>
+        <artifactId>helidon-se</artifactId>
+        <version>2.6.8-SNAPSHOT</version>
+        <relativePath/>
+    </parent>
+    <groupId>io.helidon.examples.config</groupId>
+    <artifactId>helidon-examples-config-basics</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>Helidon Config Examples Basics</name>
+
+    <description>
+        The simplest example shows how to use Configuration API.
+    </description>
+
+    <properties>
+        <mainClass>io.helidon.config.examples.basics.Main</mainClass>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.helidon.config</groupId>
+            <artifactId>helidon-config</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.helidon.config</groupId>
+            <artifactId>helidon-config-hocon</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>copy-libs</id>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

examples/config/basics/src/main/java/io/helidon/config/examples/basics/Main.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017, 2024 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.helidon.config.examples.basics;
+
+import java.nio.file.Path;
+import java.util.List;
+
+import io.helidon.config.Config;
+
+import static io.helidon.config.ConfigSources.classpath;
+
+/**
+ * Basics example.
+ */
+public class Main {
+
+    private Main() {
+    }
+
+    /**
+     * Executes the example.
+     *
+     * @param args arguments
+     */
+    public static void main(String... args) {
+        Config config = Config.create(classpath("application.conf"));
+
+        int pageSize = config.get("app.page-size").asInt().get();
+
+        boolean storageEnabled = config.get("app.storageEnabled").asBoolean().orElse(false);
+
+        List<Integer> basicRange = config.get("app.basic-range").asList(Integer.class).get();
+
+        Path loggingOutputPath = config.get("logging.outputs.file.name").as(Path.class).get();
+
+        System.out.println(pageSize);
+        System.out.println(storageEnabled);
+        System.out.println(basicRange);
+        System.out.println(loggingOutputPath);
+    }
+
+}

examples/config/basics/src/main/java/io/helidon/config/examples/basics/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2017, 2024 Oracle and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * The simplest example shows how to use Configuration API.
+ */
+package io.helidon.config.examples.basics;

examples/config/basics/src/main/resources/application.conf

@@ -0,0 +1,69 @@
+#
+# Copyright (c) 2017, 2024 Oracle and/or its affiliates.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+app {
+    greeting = "Hello"
+    name = "Demo"
+    page-size = 20
+    basic-range = [ -20, 20 ]
+    storagePassphrase = "${AES=thisIsEncriptedPassphrase}"
+}
+
+logging {
+    outputs {
+        console {
+            pattern = simple.colored
+            level = INFO
+        }
+        file {
+            pattern = verbose.colored
+            level = DEBUG
+            name = target/root.log
+        }
+    }
+    level = INFO
+    app.level = DEBUG
+    com.oracle.prime.level = WARN
+}
+
+# (this is snippet of complex configuration of security component)
+security {
+    providers: [ # First provider in the list is the default one
+        {
+            name = "BMCS"
+            class = "com.oracle.prime.security.bmcs.BmcsProvider"
+            BmcsProvider {
+                # Configuration of OPC (Bare metal) security provider
+                # (configuration cleaned to be short ...)
+
+                # targets for outbound configuration
+                targets: [
+                    {
+                        name = "s2s"
+                        transports = ["http"]
+                        hosts = ["127.0.0.1"]
+                        s2sType = "S2S"
+                    }
+                    #, other targets ...
+                ]
+            }
+        },
+        {
+            name = "ForEndUsers"
+            class = "com.oracle.prime.examples.security.primeruntime.bmcs.ExampleSecurityProvider"
+        }
+    ]
+}