Ensured that exception is thrown when process returns with invalid code

spring-cloud-release-tools-core/src/main/java/org/springframework/cloud/release/internal/project/Project.java

@@ -109,19 +109,26 @@ class ProcessExecutor {
 			String workingDir = this.properties.getWorkingDir();
 			log.info("Will run the build via {} and wait for result for [{}] minutes", commands, waitTimeInMinutes);
 			ProcessBuilder builder = builder(commands, workingDir);
-			Process process = builder.start();
+			Process process = startProcess(builder);
 			boolean finished = process.waitFor(waitTimeInMinutes, TimeUnit.MINUTES);
 			if (!finished) {
 				log.error("The build hasn't managed to finish in [{}] minutes", waitTimeInMinutes);
 				process.destroyForcibly();
 				throw new IllegalStateException("Process waiting time of [" + waitTimeInMinutes + "] minutes exceeded");
 			}
+			if (process.exitValue() != 0) {
+				throw new IllegalStateException("The process has exited with exit code [" + process.exitValue() + "]");
+			}
 		}
 		catch (InterruptedException | IOException e) {
 			throw new IllegalStateException(e);
 		}
 	}
 
+	Process startProcess(ProcessBuilder builder) throws IOException {
+		return builder.start();
+	}
+
 	ProcessBuilder builder(String[] commands, String workingDir) {
 		return new ProcessBuilder(commands)
 				.directory(new File(workingDir))

spring-cloud-release-tools-core/src/test/java/org/springframework/cloud/release/internal/project/ProjectTests.java

@@ -2,6 +2,8 @@ package org.springframework.cloud.release.internal.project;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.URISyntaxException;
 import java.nio.file.Files;
 
@@ -124,6 +126,20 @@ public class ProjectTests {
 		thenThrownBy(() -> builder.publishDocs("")).hasMessageContaining("Process waiting time of [0] minutes exceeded");
 	}
 
+	@Test
+	public void should_throw_exception_when_process_exits_with_invalid_code() throws Exception {
+		ReleaserProperties properties = new ReleaserProperties();
+		properties.getMaven().setBuildCommand("exit 1");
+		properties.setWorkingDir(file("/projects/builder/unresolved").getPath());
+		Project builder = new Project(properties, new ProcessExecutor(properties) {
+			@Override Process startProcess(ProcessBuilder builder) throws IOException {
+				return processWithInvalidExitCode();
+			}
+		});
+
+		thenThrownBy(builder::build).hasMessageContaining("The process has exited with exit code [1]");
+	}
+
 	@Test
 	public void should_successfully_execute_a_bump_versions_command() throws Exception {
 		ReleaserProperties properties = new ReleaserProperties();
@@ -140,6 +156,34 @@ public class ProjectTests {
 		then(this.reader.readPom(converters).getParent().getVersion()).isEqualTo("2.3.4.BUILD-SNAPSHOT");
 	}
 
+	private Process processWithInvalidExitCode() {
+		return new Process() {
+			@Override public OutputStream getOutputStream() {
+				return null;
+			}
+
+			@Override public InputStream getInputStream() {
+				return null;
+			}
+
+			@Override public InputStream getErrorStream() {
+				return null;
+			}
+
+			@Override public int waitFor() throws InterruptedException {
+				return 0;
+			}
+
+			@Override public int exitValue() {
+				return 1;
+			}
+
+			@Override public void destroy() {
+
+			}
+		};
+	}
+
 	private TestProcessExecutor executor(ReleaserProperties properties) {
 		return new TestProcessExecutor(properties);
 	}