test: add empty component

vul/vul-webapp/build.gradle.kts

@@ -13,6 +13,7 @@ java {
 dependencies {
     implementation("commons-fileupload:commons-fileupload:1.3.3")
     implementation("commons-beanutils:commons-beanutils:1.9.2")
+    implementation("javax.websocket:javax.websocket-api:1.1")
     providedCompile("javax.servlet:servlet-api:2.5")
 }
 

vul/vul-webapp/src/main/java/EmptyFilter.java

@@ -0,0 +1,19 @@
+import javax.servlet.*;
+import java.io.IOException;
+
+public class EmptyFilter implements Filter {
+    @Override
+    public void init(FilterConfig filterConfig) throws ServletException {
+
+    }
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        filterChain.doFilter(servletRequest, servletResponse);
+    }
+
+    @Override
+    public void destroy() {
+
+    }
+}

vul/vul-webapp/src/main/java/EmptyListener.java

@@ -0,0 +1,15 @@
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletRequestEvent;
+import javax.servlet.ServletRequestListener;
+
+public class EmptyListener implements ServletRequestListener {
+    @Override
+    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
+        ServletRequest servletRequest = servletRequestEvent.getServletRequest();
+    }
+
+    @Override
+    public void requestInitialized(ServletRequestEvent servletRequestEvent) {
+        ServletRequest servletRequest = servletRequestEvent.getServletRequest();
+    }
+}

vul/vul-webapp/src/main/java/EmptyWebSocketEndpoint.java

@@ -0,0 +1,24 @@
+import javax.websocket.Endpoint;
+import javax.websocket.EndpointConfig;
+import javax.websocket.MessageHandler;
+import javax.websocket.Session;
+import java.io.IOException;
+
+public class EmptyWebSocketEndpoint extends Endpoint implements MessageHandler.Whole<String> {
+    private Session session;
+
+    @Override
+    public void onOpen(Session session, EndpointConfig endpointConfig) {
+        this.session = session;
+        session.addMessageHandler(this);
+    }
+
+    @Override
+    public void onMessage(String message) {
+        try {
+            session.getBasicRemote().sendText("Echo: " + message);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

vul/vul-webapp/src/main/java/WebSocketConfig.java

@@ -0,0 +1,24 @@
+import javax.websocket.Endpoint;
+import javax.websocket.server.ServerApplicationConfig;
+import javax.websocket.server.ServerEndpointConfig;
+import java.util.HashSet;
+import java.util.Set;
+
+public class WebSocketConfig implements ServerApplicationConfig {
+    @Override
+    public Set<ServerEndpointConfig> getEndpointConfigs(Set<Class<? extends Endpoint>> scannedEndpointClasses) {
+        Set<ServerEndpointConfig> result = new HashSet<ServerEndpointConfig>();
+        ServerEndpointConfig config = ServerEndpointConfig.Builder
+                .create(EmptyWebSocketEndpoint.class, "/empty-ws")
+                .build();
+
+        result.add(config);
+        System.out.println("websocket init success");
+        return result;
+    }
+
+    @Override
+    public Set<Class<?>> getAnnotatedEndpointClasses(Set<Class<?>> scanned) {
+        return scanned;
+    }
+}

vul/vul-webapp/src/main/webapp/WEB-INF/web.xml

@@ -102,4 +102,16 @@
         <filter-name>servletNameTestFilter</filter-name>
         <servlet-name>biginteger</servlet-name>
     </filter-mapping>
+
+    <listener>
+        <listener-class>EmptyListener</listener-class>
+    </listener>
+    <filter>
+        <filter-name>emptyFilter</filter-name>
+        <filter-class>EmptyFilter</filter-class>
+    </filter>
+    <filter-mapping>
+        <filter-name>emptyFilter</filter-name>
+        <url-pattern>/*</url-pattern>
+    </filter-mapping>
 </web-app>

vul/vul-webapp/src/main/webapp/wsproxy.jsp

@@ -1,16 +0,0 @@
-<%--
-  Created by IntelliJ IDEA.
-  User: ReaJason
-  Date: 2026/1/16
-  Time: 23:12
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-  <head>
-    <title>$Title$</title>
-  </head>
-  <body>
-  $END$
-  </body>
-</html>