diff --git a/jetty-http/src/main/java/org/eclipse/jetty/http/pathmap/ServletPathSpec.java b/jetty-http/src/main/java/org/eclipse/jetty/http/pathmap/ServletPathSpec.java
index 514c3070853..bafdde2dd8b 100644
--- a/jetty-http/src/main/java/org/eclipse/jetty/http/pathmap/ServletPathSpec.java
+++ b/jetty-http/src/main/java/org/eclipse/jetty/http/pathmap/ServletPathSpec.java
@@ -47,7 +47,7 @@ public class ServletPathSpec extends PathSpec
         assertValidServletPathSpec(servletPathSpec);
 
         // The Root Path Spec
-        if (servletPathSpec.length() == 0)
+        if (servletPathSpec.isEmpty())
         {
             super.pathSpec = "";
             super.pathDepth = -1; // force this to be at the end of the sort order
diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/session/SessionHandler.java b/jetty-server/src/main/java/org/eclipse/jetty/server/session/SessionHandler.java
index c2263af8ff4..2ad2005ec2d 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/session/SessionHandler.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/session/SessionHandler.java
@@ -725,7 +725,7 @@ public class SessionHandler extends ScopedHandler
         if (isUsingCookies())
         {
             String sessionPath = (_cookieConfig.getPath()==null) ? contextPath : _cookieConfig.getPath();
-            sessionPath = (sessionPath==null||sessionPath.length()==0) ? "/" : sessionPath;
+            sessionPath = (sessionPath==null|| sessionPath.isEmpty()) ? "/" : sessionPath;
             String id = getExtendedId(session);
             HttpCookie cookie = null;
             if (_sessionComment == null)
diff --git a/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java b/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java
index d5c2b1917a4..5607b0f7e99 100644
--- a/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java
+++ b/jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java
@@ -628,7 +628,7 @@ public class ServletHandler extends ScopedHandler
         FilterChain chain = null;
         if (_filterChainsCached)
         {
-            if (filters.size() > 0)
+            if (!filters.isEmpty())
                 chain = newCachedChain(filters, servletHolder);
 
             final Map<String,FilterChain> cache=_chainCache[dispatch];
@@ -652,7 +652,7 @@ public class ServletHandler extends ScopedHandler
                 cache.put(key,chain);
                 lru.add(key);
         }
-        else if (filters.size() > 0)
+        else if (!filters.isEmpty())
             chain = new Chain(baseRequest,filters, servletHolder);
 
         return chain;
@@ -1567,7 +1567,7 @@ public class ServletHandler extends ScopedHandler
          */
         protected CachedChain(List<FilterHolder> filters, ServletHolder servletHolder)
         {
-            if (filters.size()>0)
+            if (!filters.isEmpty())
             {
                 _filterHolder=filters.get(0);
                 filters.remove(0);
diff --git a/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/PushCacheFilter.java b/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/PushCacheFilter.java
index 6bbd176b0d1..fbd5ad8c1bf 100644
--- a/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/PushCacheFilter.java
+++ b/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/PushCacheFilter.java
@@ -184,8 +184,8 @@ public class PushCacheFilter implements Filter
                     port = request.isSecure() ? 443 : 80;
             }
 
-            boolean referredFromHere = _hosts.size() > 0 ? _hosts.contains(host) : host.equals(request.getServerName());
-            referredFromHere &= _ports.size() > 0 ? _ports.contains(port) : port == request.getServerPort();
+            boolean referredFromHere = !_hosts.isEmpty()? _hosts.contains(host) : host.equals(request.getServerName());
+            referredFromHere &= !_ports.isEmpty()? _ports.contains(port) : port == request.getServerPort();
 
             if (referredFromHere)
             {
diff --git a/jetty-start/src/main/java/org/eclipse/jetty/start/StartArgs.java b/jetty-start/src/main/java/org/eclipse/jetty/start/StartArgs.java
index a074efd5123..102da4225ae 100644
--- a/jetty-start/src/main/java/org/eclipse/jetty/start/StartArgs.java
+++ b/jetty-start/src/main/java/org/eclipse/jetty/start/StartArgs.java
@@ -865,7 +865,7 @@ public class StartArgs
 
     public boolean hasJvmArgs()
     {
-        return jvmArgs.size() > 0;
+        return !jvmArgs.isEmpty();
     }
 
     public boolean hasSystemProperties()
diff --git a/jetty-util-ajax/src/main/java/org/eclipse/jetty/util/ajax/JSON.java b/jetty-util-ajax/src/main/java/org/eclipse/jetty/util/ajax/JSON.java
index c331ac7a3e2..d0fde189369 100644
--- a/jetty-util-ajax/src/main/java/org/eclipse/jetty/util/ajax/JSON.java
+++ b/jetty-util-ajax/src/main/java/org/eclipse/jetty/util/ajax/JSON.java
@@ -249,7 +249,7 @@ public class JSON
         try
         {
             buffer.append('"');
-            if (input != null && input.length() > 0)
+            if (input != null && !input.isEmpty())
             {
                 escapeString(buffer, input);
             }
diff --git a/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java b/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java
index 75015ac0e10..b38334fd0ff 100644
--- a/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java
+++ b/jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java
@@ -1025,10 +1025,10 @@ public class WebAppContext extends ServletContextHandler implements WebAppClassL
         throws Exception
     {
         //if the configuration instances have been set explicitly, use them
-        if (_configurations.size()>0)
+        if (!_configurations.isEmpty())
             return;
         
-        if (_configurationClasses.size()==0) {
+        if (_configurationClasses.isEmpty()) {
             _configurationClasses.addAll(Configuration.ClassList.serverDefault(getServer()));
         }
         for (String configClass : _configurationClasses)
diff --git a/tests/test-webapps/test-jetty-webapp/src/main/java/com/acme/ChatServlet.java b/tests/test-webapps/test-jetty-webapp/src/main/java/com/acme/ChatServlet.java
index ca99ec2efad..3c13db08a15 100644
--- a/tests/test-webapps/test-jetty-webapp/src/main/java/com/acme/ChatServlet.java
+++ b/tests/test-webapps/test-jetty-webapp/src/main/java/com/acme/ChatServlet.java
@@ -133,7 +133,7 @@ public class ChatServlet extends HttpServlet
             synchronized (member)
             {
                 LOG.debug("Queue size: {}", member._queue.size());
-                if (member._queue.size() > 0)
+                if (!member._queue.isEmpty())
                 {
                     sendSingleMessage(response, member);
                 }