Fallback to local sessions without Redis bean

src/main/java/egovframework/main/web/OptionalSpringSessionFilter.java

@@ -43,7 +43,12 @@ public class OptionalSpringSessionFilter implements Filter {
             chain.doFilter(request, response);
             return;
         }
-        getDelegate().doFilter(request, response, chain);
+        Filter current = getDelegate();
+        if (current == null) {
+            chain.doFilter(request, response);
+            return;
+        }
+        current.doFilter(request, response, chain);
     }
 
     @Override
@@ -60,6 +65,11 @@ public class OptionalSpringSessionFilter implements Filter {
             current = this.delegate;
             if (current == null) {
                 WebApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(this.servletContext);
+                if (!context.containsBean(TARGET_BEAN_NAME)) {
+                    this.enabled = false;
+                    this.servletContext.log("Spring Session Redis filter bean was not found. Falling back to local servlet sessions.");
+                    return null;
+                }
                 current = context.getBean(TARGET_BEAN_NAME, Filter.class);
                 this.delegate = current;
             }