### Building Spring Java Format with Maven Wrapper

Source: https://github.com/spring-io/spring-javaformat/blob/main/CONTRIBUTING.adoc

This command builds the entire Spring Java Format project from its root directory using the Maven wrapper script. It performs a clean build and installs artifacts into the local Maven repository, requiring JDK 17. Users might need to increase Maven's memory by setting the MAVEN_OPTS environment variable to -Xmx512m.

```Shell
$ ./mvnw clean install
```

--------------------------------

### Example of Read-down Method and Field Ordering (Java)

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This Java class demonstrates the recommended practice of keeping fields and constructor parameters in a consistent, 'read-down' order. It also shows private members declared as `final` whenever possible, contributing to clearer code structure and immutability.

```java
public class Name {

	private final String first;

	private final String last;

	public Name(String first, String last) {
		this.first = first;
		this.last = last;
	}

}
```

--------------------------------

### Configuring Maven Checkstyle Plugin with Spring Java Format

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To enforce Checkstyle conventions using the Spring style, add the `maven-checkstyle-plugin` to your `pom.xml` and include `spring-javaformat-checkstyle` as a dependency. This setup ensures that your project's code adheres to the Spring Checkstyle rules during the `validate` phase.

```XML
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-checkstyle-plugin</artifactId>
				<version>3.1.1</version>
				<dependencies>
					<dependency>
						<groupId>com.puppycrawl.tools</groupId>
						<artifactId>checkstyle</artifactId>
						<version>{checkstyle-version}</version>
					</dependency>
					<dependency>
						<groupId>io.spring.javaformat</groupId>
						<artifactId>spring-javaformat-checkstyle</artifactId>
						<version>{release-version}</version>
					</dependency>
				</dependencies>
				<executions>
					<execution>
						<id>checkstyle-validation</id>
						<phase>validate</phase>
						<inherited>true</inherited>
						<configuration>
							<configLocation>io/spring/javaformat/checkstyle/checkstyle.xml</configLocation>
							<includeTestSourceDirectory>true</includeTestSourceDirectory>
						</configuration>
						<goals>
							<goal>check</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
```

--------------------------------

### Initializing XML/XSLT Transformation (Cross-Browser) - JavaScript

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.site/index.html

The init function detects the browser's capabilities to load and process XML/XSLT. It uses document.implementation.createDocument for modern browsers (NSCP 7.1+, Mozilla, Safari) and ActiveXObject for IE 6.0+. It loads 'site.xml' and 'web/site.xsl' and sets up event listeners or directly calls transformation functions.

```JavaScript
function init(){ // NSCP 7.1+ / Mozilla 1.4.1+ / Safari
// Use the standard DOM Level 2 technique, if it is supported
if (document.implementation && document.implementation.createDocument) {
xmlFile = document.implementation.createDocument("", "", null);
stylesheet = document.implementation.createDocument("", "", null);
if (xmlFile.load){
xmlFile.load("site.xml");
stylesheet.load("web/site.xsl");
} else {
alert("Document could not be loaded by browser.");
}
xmlFile.addEventListener("load", transform, false);
stylesheet.addEventListener("load", transform, false);
} //IE 6.0+ solution
else if (window.ActiveXObject) {
xmlFile = new ActiveXObject("msxml2.DOMDocument.3.0");
xmlFile.async = false;
xmlFile.load("site.xml");
stylesheet = new ActiveXObject("msxml2.FreeThreadedDOMDocument.3.0");
stylesheet.async = false;
stylesheet.load("web/site.xsl");
cache = new ActiveXObject("msxml2.XSLTemplate.3.0");
cache.stylesheet = stylesheet;
transformData();
}
}
```

--------------------------------

### Generating VS Code Extension with Maven

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-vscode/README.md

This command uses Maven to clean the project and package it, resulting in the generation of the Visual Studio Code extension file (.vsix). It's a standard build process for Maven-based projects.

```Shell
mvn clean package
```

--------------------------------

### Applying Eclipse-Specific Settings for Spring Java Format

Source: https://github.com/spring-io/spring-javaformat/blob/main/CONTRIBUTING.adoc

This command applies Eclipse-specific project settings using the Maven wrapper with the 'eclipse' profile. It's run after importing the code into an Eclipse-based IDE with the M2Eclipse plugin. Note that specific projects (spring-javaformat-formatter-eclipse and spring-javaformat-formatter-eclipse-runtime) might need to be closed following import due to rewritten packages not supported by the IDE.

```Shell
$ ./mvnw -Peclipse validate
```

--------------------------------

### Applying Gradle Plugin for Source Formatting

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To enable source formatting in a Gradle project, configure your `build.gradle` file to include the `spring-javaformat-gradle-plugin` in the `buildscript` dependencies and then apply the `io.spring.javaformat` plugin. This adds `format` and `checkFormat` tasks for consistent code styling.

```Groovy
	buildscript {
		repositories {
			mavenCentral()
		}
		dependencies {
			classpath("io.spring.javaformat:spring-javaformat-gradle-plugin:{release-version}")
		}
	}

	apply plugin: 'io.spring.javaformat'
```

--------------------------------

### Importing Stylesheet for Web Site - CSS

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.site/index.html

This line imports a CSS stylesheet named 'site.css' located in the 'web' directory. It's a standard CSS @import rule used to link external stylesheets to a document.

```CSS
@import url("web/site.css");
```

--------------------------------

### Configuring Maven Plugin for Source Formatting

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To enable source formatting in a Maven project, add the `spring-javaformat-maven-plugin` to the `build` section of your `pom.xml`. This plugin applies Spring's wrapping and whitespace conventions to your Java source code.

```XML
	<build>
		<plugins>
			<plugin>
				<groupId>io.spring.javaformat</groupId>
				<artifactId>spring-javaformat-maven-plugin</artifactId>
				<version>{release-version}</version>
			</plugin>
		</plugins>
	</build>
```

--------------------------------

### Configuring IntelliJ IDEA Module as Plugin Module

Source: https://github.com/spring-io/spring-javaformat/blob/main/CONTRIBUTING.adoc

This XML snippet demonstrates how to modify an IntelliJ IDEA .iml file to convert a standard Java module into a plugin module. This change is crucial for developing IntelliJ IDEA plugins within the 'spring-javaformat-intellij-idea-plugin' module, allowing the IDE to recognize and handle plugin-specific configurations.

```XML
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="PLUGIN_MODULE" version="4">
```

--------------------------------

### Adding Maven Plugin Group for Spring Java Format

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To simplify running Maven goals for the Spring Java Format plugin, add the `io.spring.javaformat` plugin group to your `~/.m2/settings.xml` file. This allows you to execute commands like `./mvnw spring-javaformat:apply` directly.

```XML
	<pluginGroups>
		<pluginGroup>io.spring.javaformat</pluginGroup>
	</pluginGroups>
```

--------------------------------

### Styling Document Body with CSS

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.feature/license.html

This CSS rule defines the page dimensions, margins, and tab interval for the document's body element. It sets the page to a standard letter size (8.5x11 inches) and applies uniform margins, along with a default tab interval for consistent layout.

```CSS
body { size: 8.5in 11.0in; margin: 0.25in 0.5in 0.25in 0.5in; tab-interval: 0.5in; }
```

--------------------------------

### Configuring Gradle Checkstyle Plugin with Spring Java Format

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To enforce Checkstyle conventions in a Gradle project, apply the `checkstyle` plugin and add `spring-javaformat-checkstyle` as a `checkstyle` dependency. This integrates the Spring-specific Checkstyle rules into your Gradle build.

```Groovy
apply plugin: 'checkstyle'

checkstyle {
	toolVersion = "{checkstyle-version}"
}

dependencies {
	checkstyle("io.spring.javaformat:spring-javaformat-checkstyle:{release-version}")
}
```

--------------------------------

### Configuring Java 8 Baseline for Formatter

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To use the Java 8 compatible version of the Spring Java Format formatter, create a `.springjavaformatconfig` file in your project root with `java-baseline=8`. This is necessary for projects using older Java versions, as the formatter defaults to Java 17.

```Properties
java-baseline=8
```

--------------------------------

### Spring Java Format Checkstyle XML Configuration

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This XML configuration file defines the Checkstyle rules for the Spring Java Format. It includes the `SpringChecks` module, which applies the specific coding conventions and style checks used by Spring projects.

```XML
	<?xml version="1.0"?>
	<!DOCTYPE module PUBLIC
			"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
			"https://checkstyle.org/dtds/configuration_1_3.dtd">
	<module name="com.puppycrawl.tools.checkstyle.Checker">
		<module name="io.spring.javaformat.checkstyle.SpringChecks" />
	</module>
```

--------------------------------

### Customizing Eclipse Plugin Settings

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To customize project-specific settings for the Eclipse plugin, create an `eclipse.properties` file within the `.eclipse` folder in your project root. This file allows you to override default settings, such as the copyright year for new files.

```Properties
	copyright-year= # The copyright year to use in new files
```

--------------------------------

### IntelliJ IDEA Checkstyle Configuration for Spring Format

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This XML configuration is used by the CheckStyle-IDEA plugin in IntelliJ IDEA to apply Spring's coding conventions. It references the `SpringChecks` module from `io.spring.javaformat.checkstyle` to enforce the desired style.

```XML
	<?xml version="1.0"?>
	<!DOCTYPE module PUBLIC
			"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
			"https://checkstyle.org/dtds/configuration_1_3.dtd">
	<module name="com.puppycrawl.tools.checkstyle.Checker">
		<module name="io.spring.javaformat.checkstyle.SpringChecks" />
	</module>
```

--------------------------------

### Transforming XML Data (IE 6.0+) - JavaScript

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.site/index.html

This function is specifically for Internet Explorer 6.0+ using ActiveXObjects. It creates an XSLT processor from the cached stylesheet, sets the XML input, performs the transformation, and injects the resulting HTML into the element with ID 'data'.

```JavaScript
function transformData(){ var processor = cache.createProcessor(); processor.input = xmlFile; processor.transform(); data.innerHTML = processor.output; }
```

--------------------------------

### Styling Standard Paragraphs with CSS

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.feature/license.html

This CSS rule applies general styling to standard paragraph (<p>) elements. It sets the left margin to 'auto' and defines top and bottom margins to provide consistent vertical spacing between paragraphs throughout the document.

```CSS
p { margin-left: auto; margin-top: 0.5em; margin-bottom: 0.5em; }
```

--------------------------------

### Declaring Global Variables for XML/XSLT Processing - JavaScript

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.site/index.html

These global variables are declared to hold the return value counter, stylesheet, XML file, XSLT cache, and the transformed document. They are essential for managing the state and resources during the XML/XSLT transformation process.

```JavaScript
var returnval = 0; var stylesheet, xmlFile, cache, doc;
```

--------------------------------

### Styling List Paragraphs with CSS

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.feature/license.html

This CSS rule specifically targets paragraph elements with the class 'list' (p.list). It indents these paragraphs by 0.5 inches from the left and reduces their top and bottom margins, creating a tighter vertical spacing suitable for list items or similar compact content.

```CSS
p.list { margin-left: 0.5in; margin-top: 0.05em; margin-bottom: 0.05em; }
```

--------------------------------

### Configuring Indentation Style in Spring JavaFormat (Properties)

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This snippet demonstrates how to configure Spring JavaFormat to use spaces instead of tabs for indentation. By creating a `.springjavaformatconfig` file in the project root with the specified content, the formatter will apply space-based indentation.

```properties
indentation-style=spaces
```

--------------------------------

### Transforming XML Data (Modern Browsers) - JavaScript

Source: https://github.com/spring-io/spring-javaformat/blob/main/spring-javaformat-eclipse/io.spring.javaformat.eclipse.site/index.html

This function is for modern browsers supporting DOM Level 2. It increments a counter and, once both XML and XSL files are loaded (counter reaches 2), it creates an XSLTProcessor, imports the stylesheet, transforms the XML, and inserts the resulting HTML into the element with ID 'data'.

```JavaScript
function transform(){ returnval+=1; if (returnval==2){ var processor = new XSLTProcessor(); processor.importStylesheet(stylesheet); doc = processor.transformToDocument(xmlFile); document.getElementById("data").innerHTML = doc.documentElement.innerHTML; } }
```

--------------------------------

### Enforcing Maven Source Formatting Validation

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To enforce that all code adheres to the required Spring style, configure the `spring-javaformat-maven-plugin` to run the `validate` goal during the `validate` phase of the Maven build lifecycle. This ensures style consistency across the codebase.

```XML
	<build>
		<plugins>
			<plugin>
				<groupId>io.spring.javaformat</groupId>
				<artifactId>spring-javaformat-maven-plugin</artifactId>
				<version>{release-version}</version>
				<executions>
					<execution>
						<phase>validate</phase>
						<inherited>true</inherited>
						<goals>
							<goal>validate</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
```

--------------------------------

### Excluding Packages from Gradle Source Formatting

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

To prevent the `CheckFormat` task from processing specific packages, such as generated sources, configure the `tasks.withType(io.spring.javaformat.gradle.tasks.CheckFormat)` block in your Gradle build script to exclude the desired package path.

```Groovy
tasks.withType(io.spring.javaformat.gradle.tasks.CheckFormat) {
    exclude "package/to/exclude"
}
```

--------------------------------

### Excluding Specific Checks in Spring Checkstyle (XML)

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This XML configuration shows how to exclude one or more specific checks from the `SpringChecks` module within a `checkstyle.xml` file. The `excludes` property is used to list the fully qualified class names of the checks to be ignored, allowing for fine-grained control over code style enforcement.

```xml
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
		"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
		"https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="com.puppycrawl.tools.checkstyle.Checker">
	<module name="io.spring.javaformat.checkstyle.SpringChecks">
		<property name="excludes" value="io.spring.javaformat.checkstyle.check.SpringAvoidStaticImportCheck" />
	</module>
</module>
```

--------------------------------

### Disabling Automatic Formatting for Java Code Blocks

Source: https://github.com/spring-io/spring-javaformat/blob/main/README.adoc

This Java snippet illustrates how to temporarily disable automatic code formatting for a specific block of code. By enclosing the code within `@formatter:off` and `@formatter:on` comments, the formatter will skip that section, which is useful for code that is not amenable to automatic formatting, such as certain Spring Security configurations.

```java
// @formatter:off

... code not be formatted

// @formatter:on
```

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