Add workingDirectory option for Maven plugin run/start

Add configuration option that specifies the working directory to use to
run/start the application via the Maven plugin.

Closes gh-6243

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/AbstractRunMojo.java

@@ -87,6 +87,14 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	@Parameter(property = "run.noverify")
 	private Boolean noverify;
 
+	/**
+	 * The working directory of the application. If specified by default the process
+	 * will be started by forking a new JVM.
+	 * @since 1.5
+	 */
+	@Parameter(property = "run.workingDirectory")
+	private File workingDirectory;
+
 	/**
 	 * JVM arguments that should be associated with the forked process used to run the
 	 * application. On command line, make sure to wrap multiple values between quotes.
@@ -140,8 +148,8 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 
 	/**
 	 * Flag to indicate if the run processes should be forked. {@code fork} is
-	 * automatically enabled if an agent or jvmArguments are specified, or if devtools is
-	 * present.
+	 * automatically enabled if an agent, jvmArguments or working directory are
+	 * specified, or if devtools is present.
 	 * @since 1.2
 	 */
 	@Parameter(property = "fork")
@@ -185,7 +193,7 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	 * @see #logDisabledFork()
 	 */
 	protected boolean enableForkByDefault() {
-		return hasAgent() || hasJvmArgs();
+		return hasAgent() || hasJvmArgs() || hasWorkingDirectorySet();
 	}
 
 	private boolean hasAgent() {
@@ -196,6 +204,10 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 		return (this.jvmArguments != null && this.jvmArguments.length() > 0);
 	}
 
+	private boolean hasWorkingDirectorySet() {
+		return (this.workingDirectory != null);
+	}
+
 	private void findAgent() {
 		try {
 			if (this.agent == null || this.agent.length == 0) {
@@ -248,6 +260,9 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 			getLog().warn("Fork mode disabled, ignoring JVM argument(s) ["
 					+ this.jvmArguments + "]");
 		}
+		if (hasWorkingDirectorySet()) {
+			getLog().warn("Fork mode disabled, ignoring working directory configuration");
+		}
 	}
 
 	private void doRunWithForkedJvm(String startClassName)
@@ -258,16 +273,17 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 		addClasspath(args);
 		args.add(startClassName);
 		addArgs(args);
-		runWithForkedJvm(args);
+		runWithForkedJvm(this.workingDirectory, args);
 	}
 
 	/**
 	 * Run with a forked VM, using the specified command line arguments.
+	 * @param workingDirectory the working directory of the forked JVM
 	 * @param args the arguments (JVM arguments and application arguments)
 	 * @throws MojoExecutionException in case of MOJO execution errors
 	 * @throws MojoFailureException in case of MOJO failures
 	 */
-	protected abstract void runWithForkedJvm(List<String> args)
+	protected abstract void runWithForkedJvm(File workingDirectory, List<String> args)
 			throws MojoExecutionException, MojoFailureException;
 
 	/**

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/RunMojo.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.maven;
 
 import java.net.URL;
+import java.io.File;
 import java.net.URLClassLoader;
 import java.util.List;
 
@@ -63,9 +64,9 @@ public class RunMojo extends AbstractRunMojo {
 	}
 
 	@Override
-	protected void runWithForkedJvm(List<String> args) throws MojoExecutionException {
+	protected void runWithForkedJvm(File workingDirectory, List<String> args) throws MojoExecutionException {
 		try {
-			RunProcess runProcess = new RunProcess(new JavaExecutable().toString());
+			RunProcess runProcess = new RunProcess(workingDirectory, new JavaExecutable().toString());
 			Runtime.getRuntime()
 					.addShutdownHook(new Thread(new RunProcessKiller(runProcess)));
 			int exitCode = runProcess.run(true, args.toArray(new String[args.size()]));

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StartMojo.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.maven;
 
+import java.io.File;
 import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.net.ConnectException;
@@ -87,9 +88,9 @@ public class StartMojo extends AbstractRunMojo {
 	private final Object lock = new Object();
 
 	@Override
-	protected void runWithForkedJvm(List<String> args)
+	protected void runWithForkedJvm(File workingDirectory, List<String> args)
 			throws MojoExecutionException, MojoFailureException {
-		RunProcess runProcess = runProcess(args);
+		RunProcess runProcess = runProcess(args, workingDirectory);
 		try {
 			waitForSpringApplication();
 		}
@@ -103,9 +104,9 @@ public class StartMojo extends AbstractRunMojo {
 		}
 	}
 
-	private RunProcess runProcess(List<String> args) throws MojoExecutionException {
+	private RunProcess runProcess(List<String> args, File workingDirectory) throws MojoExecutionException {
 		try {
-			RunProcess runProcess = new RunProcess(new JavaExecutable().toString());
+			RunProcess runProcess = new RunProcess(workingDirectory, new JavaExecutable().toString());
 			runProcess.run(false, args.toArray(new String[args.size()]));
 			return runProcess;
 		}