Add system properties support using explicit configuration tag

See gh-10741

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/it/run-disable-fork/pom.xml

@@ -26,6 +26,10 @@
 							<fork>false</fork>
 							<jvmArguments>-Dfoo=bar</jvmArguments>
 							<workingDirectory>${project.build.sourceDirectory}</workingDirectory>
+							<systemPropertyVariables>
+								<property1>value1</property1>
+								<property2/>
+							</systemPropertyVariables>
 						</configuration>
 					</execution>
 				</executions>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/it/run-disable-fork/verify.groovy

@@ -2,6 +2,6 @@ import static org.junit.Assert.assertTrue
 
 def file = new File(basedir, "build.log")
 assertTrue file.text.contains("I haz been run")
-assertTrue file.text.contains("Fork mode disabled, ignoring JVM argument(s) [-Dfoo=bar]")
+assertTrue file.text.contains("Fork mode disabled, ignoring JVM argument(s) [-Dfoo=bar -Dproperty1=value1 -Dproperty2]")
 assertTrue file.text.contains("Fork mode disabled, ignoring working directory configuration")
 

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/it/run-jvm-system-props/pom.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>org.springframework.boot.maven.it</groupId>
+	<artifactId>run-jvmargs</artifactId>
+	<version>0.0.1.BUILD-SNAPSHOT</version>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
+	</properties>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>@project.groupId@</groupId>
+				<artifactId>@project.artifactId@</artifactId>
+				<version>@project.version@</version>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>run</goal>
+						</goals>
+						<configuration>
+							<jvmArguments>-Dfoo="value 1" -Dbar=value2</jvmArguments>
+							<systemPropertyVariables>
+								<property1>value1</property1>
+								<property2/>
+							</systemPropertyVariables>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/it/run-jvm-system-props/src/main/java/org/test/SampleApplication.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * 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 org.test;
+
+public class SampleApplication {
+
+	public static void main(String[] args) {
+		String foo = System.getProperty("foo");
+		if (!"value 1".equals(foo)) {
+			throw new IllegalStateException("foo system property mismatch (got [" + foo + "]");
+		}
+		String bar = System.getProperty("bar");
+		if (!"value2".equals(bar)) {
+			throw new IllegalStateException("bar system property mismatch (got [" + bar + "]");
+		}
+
+		String property1 = System.getProperty("property1");
+		if (!"value1".equals(property1)) {
+			throw new IllegalStateException("property1 system property mismatch (got [" + property1 + "]");
+		}
+
+		String property2 = System.getProperty("property2");
+		if (!"".equals(property2)) {
+			throw new IllegalStateException("property1 system property mismatch (got [" + property2 + "]");
+		}
+
+		System.out.println("I haz been run");
+	}
+
+}

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/it/run-jvm-system-props/verify.groovy

@@ -0,0 +1,3 @@
+def file = new File(basedir, "build.log")
+return file.text.contains("I haz been run")
+

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

@@ -25,7 +25,9 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.model.Resource;
@@ -169,6 +171,15 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	@Parameter(property = "spring-boot.run.skip", defaultValue = "false")
 	private boolean skip;
 
+	/**
+	 * List of JVM system properties. System property consists of key and value
+	 * and it will be transformed to <code>-Dkey=value</code> format.
+	 * In case if value is not specified or empty only key will be provided.
+	 * @since 2.0
+	 */
+	@Parameter(property = "spring-boot.run.systemPropertyVariabled")
+	private Map<String, String> systemPropertyVariables;
+
 	@Override
 	public void execute() throws MojoExecutionException, MojoFailureException {
 		if (this.skip) {
@@ -201,7 +212,8 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	}
 
 	private boolean hasJvmArgs() {
-		return (this.jvmArguments != null && !this.jvmArguments.isEmpty());
+		return (this.jvmArguments != null && !this.jvmArguments.isEmpty()) ||
+				(this.systemPropertyVariables != null && !this.systemPropertyVariables.isEmpty());
 	}
 
 	private boolean hasWorkingDirectorySet() {
@@ -232,8 +244,22 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 			getLog().warn("Fork mode disabled, ignoring agent");
 		}
 		if (hasJvmArgs()) {
-			getLog().warn("Fork mode disabled, ignoring JVM argument(s) ["
-					+ this.jvmArguments + "]");
+			String messageTemplate = "Fork mode disabled, ignoring JVM argument(s) [%s%s]";
+			String sysPropsStr = "";
+			if (this.systemPropertyVariables != null && !this.systemPropertyVariables.isEmpty()) {
+				sysPropsStr = this.systemPropertyVariables
+						.entrySet()
+						.stream()
+						.map(e -> SystemPropertyFormatter.format(e.getKey(), e.getValue()))
+						.collect(Collectors.joining(" "));
+			}
+			String message = String.format(
+					messageTemplate,
+					this.jvmArguments,
+					sysPropsStr.isEmpty() ? sysPropsStr : " " + sysPropsStr
+			);
+
+			getLog().warn(message);
 		}
 		if (hasWorkingDirectorySet()) {
 			getLog().warn("Fork mode disabled, ignoring working directory configuration");
@@ -292,7 +318,22 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	 * @return a {@link RunArguments} defining the JVM arguments
 	 */
 	protected RunArguments resolveJvmArguments() {
-		return new RunArguments(this.jvmArguments);
+		final StringBuilder stringBuilder = new StringBuilder();
+		if (this.jvmArguments != null) {
+			stringBuilder.append(this.jvmArguments);
+		}
+		if (this.systemPropertyVariables != null) {
+			String result = this.systemPropertyVariables
+					.entrySet()
+					.stream()
+					.map(e -> SystemPropertyFormatter.format(e.getKey(), e.getValue()))
+					.collect(Collectors.joining(" "));
+			stringBuilder
+					.append(" ")
+					.append(result);
+
+		}
+		return new RunArguments(stringBuilder.toString());
 	}
 
 	private void addJvmArgs(List<String> args) {
@@ -509,4 +550,23 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 
 	}
 
+	/**
+	 * System properties formatter.
+	 */
+	static class SystemPropertyFormatter {
+
+		private static final String NO_VALUE_FORMAT = "-D%s";
+		private static final String KEY_VALUE_FORMAT = NO_VALUE_FORMAT + "=%s";
+
+		public static String format(Object key, Object value) {
+			if (key == null) {
+				return "";
+			}
+			if (value == null || String.valueOf(value).trim().isEmpty()) {
+				return String.format(NO_VALUE_FORMAT, key);
+			}
+			return String.format(KEY_VALUE_FORMAT, key, value);
+		}
+	}
+
 }

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/test/java/org/springframework/boot/maven/SystemPropertyFormatterTests.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * 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 org.springframework.boot.maven;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+import org.springframework.boot.maven.AbstractRunMojo.SystemPropertyFormatter;
+
+/**
+ * Tests for {@link AbstractRunMojo.SystemPropertyFormatter}
+ */
+public class SystemPropertyFormatterTests {
+
+	@Test
+	public void parseEmpty() throws Exception {
+		Assertions.assertThat(SystemPropertyFormatter.format(null, null))
+				.isEqualTo("");
+	}
+
+	@Test
+	public void parseOnlyKey() throws Exception {
+		Assertions.assertThat(SystemPropertyFormatter.format("key1", null))
+				.isEqualTo("-Dkey1");
+	}
+
+	@Test
+	public void parseKeyWithValue() throws Exception {
+		Assertions.assertThat(SystemPropertyFormatter.format("key1", "value1"))
+				.isEqualTo("-Dkey1=value1");
+	}
+
+	@Test
+	public void parseKeyWithEmptyValue() throws Exception {
+		Assertions.assertThat(SystemPropertyFormatter.format("key1", ""))
+				.isEqualTo("-Dkey1");
+	}
+}