diff --git a/.gitignore b/.gitignore
index a1c2a23..ece5808 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,6 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+.idea
+target
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 29b6d70..5f76a89 100644
--- a/pom.xml
+++ b/pom.xml
@@ -52,6 +52,11 @@
             <artifactId>fastjson</artifactId>
             <version>1.2.51</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.7</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
diff --git a/src/main/java/name/jervyshi/nacos/NacosStarter.java b/src/main/java/name/jervyshi/nacos/NacosStarter.java
index d78e2ca..a10982d 100644
--- a/src/main/java/name/jervyshi/nacos/NacosStarter.java
+++ b/src/main/java/name/jervyshi/nacos/NacosStarter.java
@@ -26,6 +26,7 @@
 import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
 
+import org.apache.commons.io.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -37,32 +38,35 @@
 
 /**
  * The type Nacos starter.
+ *
  * @author JervyShi
  * @version $Id : NacosStarter.java, v 0.1 2019-02-08 17:18 JervyShi Exp $$
  */
 public class NacosStarter {
 
-    /** logger */
+    /**
+     * logger
+     */
     private static final Logger logger = LoggerFactory.getLogger(NacosStarter.class);
 
-    private String              nacosVersion;
+    private String nacosVersion;
 
-    private Path                downloadPath;
+    private Path downloadPath;
 
-    private Path                nacosHomePath;
+    private Path nacosHomePath;
 
-    private AtomicBoolean       started;
+    private AtomicBoolean started;
 
-    private NacosProcess        nacosProcess;
+    private NacosProcess nacosProcess;
 
-    private String              host;
+    private String host;
 
-    private NacosPorts          nacosPorts;
+    private NacosPorts nacosPorts;
 
     /**
      * Instantiates a new Nacos starter.
      *
-     * @param nacosVersion the nacos version 
+     * @param nacosVersion the nacos version
      * @param downloadPath the download path
      */
     NacosStarter(String nacosVersion, Path downloadPath, String host, NacosPorts nacosPorts) {
@@ -79,13 +83,14 @@ public class NacosStarter {
      * @return the nacos process
      */
     public NacosProcess start() {
+        Process innerProcess = null;
         try {
             logger.info("Start new nacos process.");
             checkInitialState();
 
             if (started.compareAndSet(false, true)) {
                 nacosHomePath = Paths.get(downloadPath.toAbsolutePath().toString(),
-                    String.valueOf(nacosPorts.getServerPort()), "nacos");
+                        String.valueOf(nacosPorts.getServerPort()), "nacos");
                 if (!isBinaryDownloaded()) {
                     downloadAndUnpackBinary();
                 }
@@ -95,10 +100,10 @@ public NacosProcess start() {
                 List<String> command = new ArrayList<>();
                 if (isWindows()) {
                     command.add(Paths.get(System.getenv("JAVA_HOME"), "bin", "java.exe")
-                        .toAbsolutePath().toString());
+                            .toAbsolutePath().toString());
                 } else {
                     command.add(Paths.get(System.getenv("JAVA_HOME"), "bin", "java")
-                        .toAbsolutePath().toString());
+                            .toAbsolutePath().toString());
                 }
                 command.add("-Dnacos.standalone=true");
                 command.add("-Dnacos.home=" + nacosHomePath.toAbsolutePath().toString());
@@ -106,15 +111,12 @@ public NacosProcess start() {
                 command.add("-jar");
                 command.add(getAbsolutePath("target", "nacos-server.jar"));
                 command.add(
-                    "--spring.config.location=classpath:/,classpath:/config/,file:./,file:./config/,file:"
-                            + getAbsolutePath("conf") + File.separator);
+                        "--spring.config.location=classpath:/,optional:classpath:/config/,optional:file:./,optional:file:./config/,optional:file:"
+                                + getAbsolutePath("conf") + File.separator);
                 command.add("--logging.config=" + getAbsolutePath("conf", "nacos-logback.xml"));
 
-                Process innerProcess = new ProcessBuilder().directory(nacosHomePath.toFile())
-                    .command(command).inheritIO().redirectOutput(Redirect.PIPE).start();
-
-                // TODO log process result
-                innerProcess.getInputStream();
+                innerProcess = new ProcessBuilder().directory(nacosHomePath.toFile())
+                        .command(command).inheritIO().redirectOutput(Redirect.PIPE).start();
 
                 nacosProcess = new NacosProcess(host, nacosPorts, innerProcess);
 
@@ -122,9 +124,20 @@ public NacosProcess start() {
                 new NacosWaiter(host, serverPort).avoidUntilNacosServerStarted();
                 logger.info("Nacos server started");
             }
+        } catch (NacosEmbeddedException e) {
+            // Log standard output and error stream
+            try {
+                List<String> outputLines = IOUtils.readLines(innerProcess.getInputStream(), "UTF-8");
+                outputLines.forEach(System.err::println);
+                List<String> errorLines = IOUtils.readLines(innerProcess.getErrorStream(), "UTF-8");
+                errorLines.forEach(System.err::println);
+            } catch (IOException ex) {
+                throw new RuntimeException(ex);
+            }
         } catch (IOException e) {
             logger.error("fail to start nacos process, nacosVersion: {}, downloadPath:{}",
-                nacosVersion, downloadPath, e);
+                    nacosVersion, downloadPath, e);
+            // Print error stream if there is any.
             throw new NacosEmbeddedException("fail to start nacos process");
         }
         return nacosProcess;
@@ -139,7 +152,7 @@ private void downloadAndUnpackBinary() throws IOException {
         }
 
         String unzipLocation = Paths.get(downloadPath.toAbsolutePath().toString(),
-            String.valueOf(nacosPorts.getServerPort())).toAbsolutePath().toString();
+                String.valueOf(nacosPorts.getServerPort())).toAbsolutePath().toString();
         logger.info("Unzip nacos archive files into: {}", unzipLocation);
 
         ZipUtil.unzip(filePath.toAbsolutePath().toString(), unzipLocation);
@@ -155,19 +168,19 @@ private boolean isBinaryDownloaded() {
 
     private Path getDownloadFilePath() {
         return Paths.get(downloadPath.toAbsolutePath().toString(),
-            String.format("nacos-server-%s.zip", nacosVersion));
+                String.format("nacos-server-%s.zip", nacosVersion));
     }
 
     private File getNacosServerJar() {
         Path path = Paths.get(nacosHomePath.toAbsolutePath().toString(), "target",
-            "nacos-server.jar");
+                "nacos-server.jar");
         return path.toFile();
     }
 
     private void checkInitialState() {
         if (started.get()) {
             throw new NacosEmbeddedException(
-                "This Nacos Starter already started nacos server. Create new Nacos Server Instance");
+                    "This Nacos Starter already started nacos server. Create new Nacos Server Instance");
         }
     }