Render as much content as possible - even if there are missing parame…

…ters

example-webapp.ipr

@@ -351,6 +351,7 @@
         <root url="jar://$PROJECT_DIR$/lib/compile/source/freemarker-2.3.18.jar!/" />
         <root url="jar://$PROJECT_DIR$/lib/compile/source/hibernate-core-3.6.7.Final.jar!/" />
         <root url="jar://$PROJECT_DIR$/lib/compile/source/spring-webmvc-3.0.6.RELEASE.jar!/" />
+        <root url="jar://$PROJECT_DIR$/lib/compile/source/spring-context-support-3.0.6.RELEASE.jar!/" />
       </SOURCES>
       <jarDirectory url="file://$PROJECT_DIR$/lib/compile/jar" recursive="false" />
     </library>

src/main/example/ftl/HtmlExceptionHandler.java

@@ -0,0 +1,25 @@
+package example.ftl;
+
+import freemarker.core.Environment;
+import freemarker.template.TemplateException;
+import freemarker.template.TemplateExceptionHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.Writer;
+
+public class HtmlExceptionHandler implements TemplateExceptionHandler {
+
+    private final Logger logger = LoggerFactory.getLogger(getClass());
+
+    @Override
+    public void handleTemplateException(TemplateException te, Environment env, Writer out) throws TemplateException {
+        logger.warn(te.getMessage() + "\n" + te.getFTLInstructionStack());
+        try {
+            out.write("???");
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/main/example/ftl/HtmlFreeMarkerConfigurer.java

@@ -1,8 +1,12 @@
 package example.ftl;
 
 import freemarker.cache.TemplateLoader;
+import freemarker.log.Logger;
+import freemarker.template.Configuration;
+import freemarker.template.TemplateException;
 import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
 
+import java.io.IOException;
 import java.util.List;
 
 public class HtmlFreeMarkerConfigurer extends FreeMarkerConfigurer {
@@ -18,4 +22,19 @@ protected void postProcessTemplateLoaders(List<TemplateLoader> templateLoaders)
         // spring.ftl from classpath will not work with the HtmlTemplateLoader
         // use /WEB-INF/templates/spring.ftl instead
     }
+
+    @Override
+    protected void postProcessConfiguration(Configuration config) throws IOException, TemplateException {
+        config.setTemplateExceptionHandler(new HtmlExceptionHandler());
+    }
+
+    @Override
+    public void afterPropertiesSet() throws IOException, TemplateException {
+        try {
+            Logger.selectLoggerLibrary(Logger.LIBRARY_SLF4J);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+        super.afterPropertiesSet();
+    }
 }

src/main/logback.xml

@@ -8,6 +8,7 @@
 
     <logger name="example" level="INFO" />
     <logger name="org.mortbay" level="INFO" />
+    <logger name="freemarker.runtime" level="OFF" />
     <logger name="STATS" level="TRACE" />
 
     <root level="WARN">