@@ -, +, @@ 
 getRessourceOnlyServlets
---
 java/org/apache/catalina/core/StandardContext.java     |  2 ++
 test/org/apache/catalina/core/TestStandardContext.java | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)
--- a/java/org/apache/catalina/core/StandardContext.java	
+++ a/java/org/apache/catalina/core/StandardContext.java	
@@ -920,6 +920,8 @@ public class StandardContext extends ContainerBase
         for (String servletName : resourceOnlyServlets) {
             if (!first) {
                 result.append(',');
+            } else {
+                first = false;
             }
             result.append(servletName);
         }
--- a/test/org/apache/catalina/core/TestStandardContext.java	
+++ a/test/org/apache/catalina/core/TestStandardContext.java	
@@ -19,6 +19,7 @@ package org.apache.catalina.core;
 import java.io.File;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -48,6 +49,7 @@ import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import org.hamcrest.CoreMatchers;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -945,4 +947,19 @@ public class TestStandardContext extends TomcatBaseTest {
 
         Assert.assertNull(realPath);
     }
+
+    @Test
+    public void testBug56903() {
+        // Set up a container
+        Tomcat tomcat = getTomcatInstance();
+
+        File docBase = new File(System.getProperty("java.io.tmpdir"));
+        Context context = tomcat.addContext("",
+                docBase.getAbsolutePath());
+
+        context.setResourceOnlyServlets("a,b,c");
+        Assert.assertThat(
+                Arrays.asList(context.getResourceOnlyServlets().split(",")),
+                CoreMatchers.hasItems("a", "b", "c"));
+    }
 }
--