Umstellung auf Thymeleaf: Zwischenschritt - Fehler in Thymeleaf umschifft

[website] / src / main / java / de / juplo / branding / web / ForceIncludeFilter.java

diff --git a/src/main/java/de/juplo/branding/web/ForceIncludeFilter.java b/src/main/java/de/juplo/branding/web/ForceIncludeFilter.java
new file mode 100644 (file)
index 0000000..953e8b2
--- /dev/null
+++ b/src/main/java/de/juplo/branding/web/ForceIncludeFilter.java
@@ -0,0 +1,55 @@
+package de.juplo.branding.web;
+
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.tiles.servlet.context.ServletUtil;
+
+
+
+/**
+ * Fixes a logic-bug in the colaboration of Thymeleaf and Tiles.
+ *
+ * Tiles 2.2.x tries to use RequestDispatcher.forward() whenever possible, but
+ * this breaks Thymeleaf, because the original response is marked as committed,
+ * when forwarding. Hence, Thymeleaf cannot render its result in the response
+ * and an empty page is returned.
+ * 
+ * @author kai
+ */
+public class ForceIncludeFilter implements Filter
+{
+
+  @Override
+  public void init(FilterConfig filterConfig) throws ServletException
+  {
+  }
+
+  @Override
+  public void doFilter(
+      ServletRequest request,
+      ServletResponse response,
+      FilterChain chain
+      )
+      throws
+        IOException,
+        ServletException
+  {
+    if ((response instanceof HttpServletResponse))
+      ServletUtil.setForceInclude((HttpServletRequest)request, true);
+ 
+    chain.doFilter(request, response);
+  }
+
+  @Override
+  public void destroy()
+  {
+  }
+  
+}