diff --git a/server-core/src/main/java/io/onedev/server/util/jackson/ObjectMapperProvider.java b/server-core/src/main/java/io/onedev/server/util/jackson/ObjectMapperProvider.java
index 75b772294d..4a322f81a5 100644
--- a/server-core/src/main/java/io/onedev/server/util/jackson/ObjectMapperProvider.java
+++ b/server-core/src/main/java/io/onedev/server/util/jackson/ObjectMapperProvider.java
@@ -13,6 +13,7 @@ import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.databind.DeserializationConfig;
 import com.fasterxml.jackson.databind.JavaType;
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationConfig;
 import com.fasterxml.jackson.databind.SerializationFeature;
@@ -53,6 +54,7 @@ public class ObjectMapperProvider implements Provider<ObjectMapper> {
 			private boolean useForType(JavaType t) {
 				return  !Collection.class.isAssignableFrom(t.getRawClass()) 
 						&& !Map.class.isAssignableFrom(t.getRawClass()) 
+						&& t.getRawClass() != JsonNode.class
 						&& (t.getRawClass() == Object.class || !t.isConcrete());				
 			}
 
diff --git a/server-core/src/main/java/io/onedev/server/web/component/markdown/emoji/EmojiOnes.java b/server-core/src/main/java/io/onedev/server/web/component/markdown/emoji/EmojiOnes.java
index 62df09d8e0..f5c29b595c 100644
--- a/server-core/src/main/java/io/onedev/server/web/component/markdown/emoji/EmojiOnes.java
+++ b/server-core/src/main/java/io/onedev/server/web/component/markdown/emoji/EmojiOnes.java
@@ -5,21 +5,21 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
-import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Splitter;
 
 import io.onedev.commons.utils.ExceptionUtils;
+import io.onedev.server.OneDev;
 
 public class EmojiOnes {
 	
-	private static final ObjectMapper objectMapper = new ObjectMapper(); 
-	
 	private final Map<String, String> codes;
 	
 	private static class LazyHolder {
@@ -32,15 +32,15 @@ public class EmojiOnes {
     
 	private EmojiOnes() {
 		try (InputStream in = EmojiOnes.class.getResourceAsStream("emoji.json")) {
-			Map<String, Map<String, String>> json = 
-					objectMapper.readValue(in, new TypeReference<LinkedHashMap<String, Map<String, String>>>() {});
+			JsonNode emojis = OneDev.getInstance(ObjectMapper.class).readTree(in);
 			
 			Map<String, String> map = new HashMap<>();
 			
-			for (Entry<String, Map<String, String>> each : json.entrySet()) {
-				String code = each.getValue().get("unicode");
-				map.put(each.getKey(), code);
-				String aliases = each.getValue().get("aliases");
+			for (Iterator<Entry<String, JsonNode>> it = emojis.fields(); it.hasNext();) {
+				Entry<String, JsonNode> entry = it.next();
+				String code = entry.getValue().get("unicode").asText();
+				map.put(entry.getKey(), code);
+				String aliases = entry.getValue().get("aliases").asText();
 				for (String alias : Splitter.on(" ").omitEmptyStrings().split(aliases)) {
 					String name = alias.substring(1, alias.length() - 1);
 					map.put(name, code);
diff --git a/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.html b/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.html
index 0357cf9235..795b443f3a 100644
--- a/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.html
+++ b/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.html
@@ -1,4 +1,3 @@
 <wicket:extend>
-	<a wicket:id="run">run</a>
-	<a wicket:id="stop">stop</a>
+	<a wicket:id="test">test</a>
 </wicket:extend>
\ No newline at end of file
diff --git a/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.java b/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.java
index e18a7e1238..b14f784038 100644
--- a/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.java
+++ b/server-core/src/main/java/io/onedev/server/web/page/test/TestPage.java
@@ -6,8 +6,6 @@ import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
 import org.apache.wicket.markup.html.link.Link;
 import org.apache.wicket.request.mapper.parameter.PageParameters;
 
-import io.onedev.commons.utils.command.Commandline;
-import io.onedev.commons.utils.command.LineConsumer;
 import io.onedev.server.web.page.base.BasePage;
 
 @SuppressWarnings("serial")
@@ -23,48 +21,10 @@ public class TestPage extends BasePage {
 	protected void onInitialize() {
 		super.onInitialize();
 
-		add(new Link<Void>("run") {
+		add(new Link<Void>("test") {
 
 			@Override
 			public void onClick() {
-				thread = new Thread(new Runnable() {
-
-					@Override
-					public void run() {
-						try {
-							Commandline cmd = new Commandline("sh");
-							cmd.addArgs("/home/robin/temp/test.sh");
-							cmd.execute(new LineConsumer() {
-	
-								@Override
-								public void consume(String line) {
-									System.out.println(line);
-								}
-								
-							}, new LineConsumer() {
-	
-								@Override
-								public void consume(String line) {
-									System.err.println(line);
-								}
-									
-							}).checkReturnCode();
-						} catch (Exception e) {
-							e.printStackTrace();
-						}
-					}
-					
-				});
-				thread.start();
-			}
-			
-		});
-		
-		add(new Link<Void>("stop") {
-
-			@Override
-			public void onClick() {
-				thread.interrupt();
 			}
 			
 		});
diff --git a/server-plugin/server-plugin-kubernetes/src/main/java/io/onedev/server/plugin/kubernetes/KubernetesExecutor.java b/server-plugin/server-plugin-kubernetes/src/main/java/io/onedev/server/plugin/kubernetes/KubernetesExecutor.java
index 10f9f1670b..1f6c98f2c0 100644
--- a/server-plugin/server-plugin-kubernetes/src/main/java/io/onedev/server/plugin/kubernetes/KubernetesExecutor.java
+++ b/server-plugin/server-plugin-kubernetes/src/main/java/io/onedev/server/plugin/kubernetes/KubernetesExecutor.java
@@ -415,8 +415,9 @@ public class KubernetesExecutor extends JobExecutor implements Testable<TestData
 				auths.put(registryUrl, Maps.newLinkedHashMap(
 						"auth", Base64.encodeBase64String(auth.getBytes(Charsets.UTF_8))));
 			}
+			ObjectMapper mapper = OneDev.getInstance(ObjectMapper.class);
 			try {
-				String dockerConfig = new ObjectMapper().writeValueAsString(Maps.newLinkedHashMap("auths", auths));
+				String dockerConfig = mapper.writeValueAsString(Maps.newLinkedHashMap("auths", auths));
 				return createSecret(Maps.newLinkedHashMap(".dockerconfigjson", dockerConfig), "kubernetes.io/dockerconfigjson", logger);
 			} catch (JsonProcessingException e) {
 				throw new RuntimeException(e);
@@ -846,7 +847,7 @@ public class KubernetesExecutor extends JobExecutor implements Testable<TestData
 		JsonNode nodeNode;
 		KubernetesExecutor.logger.trace("Node json:\n" + nodeJson.toString());
 		try {
-			nodeNode = new ObjectMapper().readTree(nodeJson.toString());
+			nodeNode = OneDev.getInstance(ObjectMapper.class).readTree(nodeJson.toString());
 		} catch (IOException e) {
 			throw new RuntimeException(e);
 		}
@@ -919,7 +920,7 @@ public class KubernetesExecutor extends JobExecutor implements Testable<TestData
 	private void watchPod(String podName, StatusChecker statusChecker, JobLogger logger) {
 		Commandline kubectl = newKubeCtl();
 		
-		ObjectMapper mapper = new ObjectMapper();
+		ObjectMapper mapper = OneDev.getInstance(ObjectMapper.class);
 		
 		AtomicReference<StopWatch> stopWatchRef = new AtomicReference<>(null); 
 		
@@ -1023,7 +1024,7 @@ public class KubernetesExecutor extends JobExecutor implements Testable<TestData
 	private void checkEventError(String podName, JobLogger logger) {
 		Commandline kubectl = newKubeCtl();
 		
-		ObjectMapper mapper = new ObjectMapper();
+		ObjectMapper mapper = OneDev.getInstance(ObjectMapper.class);
 		
 		StringBuilder json = new StringBuilder();
 		kubectl.addArgs("get", "event", "-n", getNamespace(), "--field-selector", 
diff --git a/server-plugin/server-plugin-node/src/main/java/io/onedev/server/plugin/node/DefaultNodeCISpecProvider.java b/server-plugin/server-plugin-node/src/main/java/io/onedev/server/plugin/node/DefaultNodeCISpecProvider.java
index a0d234e4e1..de6403d307 100644
--- a/server-plugin/server-plugin-node/src/main/java/io/onedev/server/plugin/node/DefaultNodeCISpecProvider.java
+++ b/server-plugin/server-plugin-node/src/main/java/io/onedev/server/plugin/node/DefaultNodeCISpecProvider.java
@@ -11,6 +11,7 @@ import org.slf4j.LoggerFactory;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
+import io.onedev.server.OneDev;
 import io.onedev.server.ci.CISpec;
 import io.onedev.server.ci.DefaultCISpecProvider;
 import io.onedev.server.ci.job.CacheSpec;
@@ -33,7 +34,7 @@ public class DefaultNodeCISpecProvider implements DefaultCISpecProvider {
 			String version = null;
 
 			content = blob.getText().getContent();
-			ObjectMapper objectMapper = new ObjectMapper();
+			ObjectMapper objectMapper = OneDev.getInstance(ObjectMapper.class);
 			JsonNode jsonNode;
 			try {
 				jsonNode = objectMapper.readTree(content);
diff --git a/server-plugin/server-plugin-serverdocker/src/main/java/io/onedev/server/plugin/serverdocker/ServerDockerExecutor.java b/server-plugin/server-plugin-serverdocker/src/main/java/io/onedev/server/plugin/serverdocker/ServerDockerExecutor.java
index 13aa7a8253..4bf27b939c 100644
--- a/server-plugin/server-plugin-serverdocker/src/main/java/io/onedev/server/plugin/serverdocker/ServerDockerExecutor.java
+++ b/server-plugin/server-plugin-serverdocker/src/main/java/io/onedev/server/plugin/serverdocker/ServerDockerExecutor.java
@@ -129,7 +129,6 @@ public class ServerDockerExecutor extends JobExecutor implements Testable<TestDa
 			return new Commandline("docker");
 	}
 	
-	@SuppressWarnings("unchecked")
 	private String getImageOS(JobLogger logger, String image) {
 		logger.log("Checking image OS...");
 		Commandline docker = getDocker();
@@ -146,11 +145,8 @@ public class ServerDockerExecutor extends JobExecutor implements Testable<TestDa
 			
 		}, newJobLogger(logger)).checkReturnCode();
 
-		Map<String, Object> map;
 		try {
-			map = (Map<String, Object>) new ObjectMapper()
-					.readValue(builder.toString(), List.class).iterator().next();
-			return (String) map.get("Os");
+			return OneDev.getInstance(ObjectMapper.class).readTree(builder.toString()).iterator().next().get("Os").asText();
 		} catch (IOException e) {
 			throw new RuntimeException(e);
 		}