refactor http servlet response processing to prohibit 'chunked' transfer encoding

15 files changed, 90 insertions, 67 deletions

diff --git a/id/ConfigWebTool/src/main/java/at/gv/egovernment/moa/id/configuration/auth/pvp2/servlets/BuildMetadata.java b/id/ConfigWebTool/src/main/java/at/gv/egovernment/moa/id/configuration/auth/pvp2/servlets/BuildMetadata.java
index 5b413567a..7256d8688 100644
--- a/id/ConfigWebTool/src/main/java/at/gv/egovernment/moa/id/configuration/auth/pvp2/servlets/BuildMetadata.java
+++ b/id/ConfigWebTool/src/main/java/at/gv/egovernment/moa/id/configuration/auth/pvp2/servlets/BuildMetadata.java
@@ -285,12 +285,12 @@ public class BuildMetadata extends HttpServlet {
 			transformer.transform(source, sr);
 			sw.close();
 			
-			String metadataXML = sw.toString();
+			byte[] metadataXML = sw.toString().getBytes("UTF-8");
 						
 			response.setContentType("text/xml");
-			response.getOutputStream().write(metadataXML.getBytes());
+			response.setContentLength(metadataXML.length);
+			response.getOutputStream().write(metadataXML);
 			
-			response.getOutputStream().close();
 			
 		} catch (ConfigurationException e) {
 			log.warn("Configuration can not be loaded.", e);
diff --git a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/auth/servlet/interceptor/WebFrontEndSecurityInterceptor.java b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/auth/servlet/interceptor/WebFrontEndSecurityInterceptor.java
index 9fdec9fbb..2976dc420 100644
--- a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/auth/servlet/interceptor/WebFrontEndSecurityInterceptor.java
+++ b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/auth/servlet/interceptor/WebFrontEndSecurityInterceptor.java
@@ -50,7 +50,14 @@ public class WebFrontEndSecurityInterceptor implements HandlerInterceptor {
 	@Override
 	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
 			throws Exception {
-				
+
+		//TODO: add additional headers or checks 
+		//set security headers
+		response.setHeader(MOAIDAuthConstants.HEADER_EXPIRES, MOAIDAuthConstants.HEADER_VALUE_EXPIRES);
+		response.setHeader(MOAIDAuthConstants.HEADER_PRAGMA, MOAIDAuthConstants.HEADER_VALUE_PRAGMA);
+		response.setHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL, MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL);
+		response.addHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL, MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL_IE);
+		
 		//only for SAML1 GetAuthenticationData webService functionality
 		String requestedServlet = request.getServletPath();		
 		if (MiscUtil.isNotEmpty(requestedServlet) && 
@@ -85,13 +92,9 @@ public class WebFrontEndSecurityInterceptor implements HandlerInterceptor {
 	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
 			ModelAndView modelAndView) throws Exception {
 
-		//TODO: add additional headers or checks 
 		
-		//set security headers
-		response.setHeader(MOAIDAuthConstants.HEADER_EXPIRES, MOAIDAuthConstants.HEADER_VALUE_EXPIRES);
-		response.setHeader(MOAIDAuthConstants.HEADER_PRAGMA, MOAIDAuthConstants.HEADER_VALUE_PRAGMA);
-		response.setHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL, MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL);
-		response.addHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL, MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL_IE);
+		
+
 
 	}
 
diff --git a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/protocols/pvp2x/MetadataAction.java b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/protocols/pvp2x/MetadataAction.java
index b282e3a4b..851f47a68 100644
--- a/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/protocols/pvp2x/MetadataAction.java
+++ b/id/server/idserverlib/src/main/java/at/gv/egovernment/moa/id/protocols/pvp2x/MetadataAction.java
@@ -63,12 +63,12 @@ public class MetadataAction implements IAction {
 			
 			String metadataXML = metadatabuilder.buildPVPMetadata(metadataConfig);			
 			Logger.debug("METADATA: " + metadataXML);
-						
+					
+			byte[] content = metadataXML.getBytes("UTF-8");
+			httpResp.setStatus(HttpServletResponse.SC_OK);
+			httpResp.setContentLength(content.length);
 			httpResp.setContentType(MediaType.XML_UTF_8.toString());
-			httpResp.getOutputStream().write(metadataXML.getBytes("UTF-8"));
-
-			httpResp.getOutputStream().close();
-
+			httpResp.getOutputStream().write(content);			
 			return null;
 			
 		} catch (Exception e) {
diff --git a/id/server/moa-id-frontend-resources/src/main/java/at/gv/egovernment/moa/id/auth/frontend/builder/GUIFormBuilderImpl.java b/id/server/moa-id-frontend-resources/src/main/java/at/gv/egovernment/moa/id/auth/frontend/builder/GUIFormBuilderImpl.java
index 26b37226d..e77933986 100644
--- a/id/server/moa-id-frontend-resources/src/main/java/at/gv/egovernment/moa/id/auth/frontend/builder/GUIFormBuilderImpl.java
+++ b/id/server/moa-id-frontend-resources/src/main/java/at/gv/egovernment/moa/id/auth/frontend/builder/GUIFormBuilderImpl.java
@@ -101,11 +101,23 @@ public class GUIFormBuilderImpl implements IGUIFormBuilder {
 			//evaluate template
 			StringWriter writer = new StringWriter();
 			engine.evaluate(context, writer, loggerName, new BufferedReader(new InputStreamReader(is)));
-				
+							
 			//write template to response
+			final byte[] content = writer.toString().getBytes("UTF-8");
 			httpResp.setStatus(HttpServletResponse.SC_OK);
-			httpResp.setContentType(contentType);            		
-			httpResp.getOutputStream().write(writer.toString().getBytes("UTF-8"));
+			httpResp.setContentLength(content.length);
+			httpResp.setContentType(contentType);						
+			httpResp.getOutputStream().write(content);
+			
+			if (Logger.isTraceEnabled()) {
+				Logger.trace("Write Content for viewName:" + viewName 
+						+ ". Contentsize:" + String.valueOf(content.length)
+						+ " BufferSize:" + httpResp.getBufferSize()
+						+ " ContentType:" + contentType);
+				for (String el : httpResp.getHeaderNames())
+					Logger.trace(" * Headername:" + el + " Value:" + httpResp.getHeader(el));
+				
+			}
 			
 		} catch (IOException e) {
 			Logger.error("GUI form-builder has an internal error.", e);
diff --git a/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/internal/tasks/CreateIdentityLinkFormTask.java b/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/internal/tasks/CreateIdentityLinkFormTask.java
index e47aff83b..e1495f254 100644
--- a/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/internal/tasks/CreateIdentityLinkFormTask.java
+++ b/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/internal/tasks/CreateIdentityLinkFormTask.java
@@ -1,7 +1,5 @@
 package at.gv.egovernment.moa.id.auth.modules.internal.tasks;
 
-import java.io.PrintWriter;
-
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
@@ -79,11 +77,12 @@ public class CreateIdentityLinkFormTask extends AbstractAuthServletTask {
 					pendingReq, MOAIDEventConstants.AUTHPROCESS_BKU_URL, moasession.getBkuURL());
 				     				
 			if (!StringUtils.isEmpty(getIdentityLinkForm)) {
+				byte[] content = getIdentityLinkForm.getBytes("UTF-8");
 				resp.setContentType(MediaType.HTML_UTF_8.toString());
-				PrintWriter out = new PrintWriter(resp.getOutputStream());
-				out.print(getIdentityLinkForm);
-				out.flush();
+				resp.setContentLength(content.length);
+				resp.getOutputStream().write(content);
 				Logger.debug("Finished GET " + CreateIdentityLinkFormTask.class);
+				
 			}
 			
 		} catch (WrongParametersException ex) {
diff --git a/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/util/CitizenCardServletUtils.java b/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/util/CitizenCardServletUtils.java
index 9fbdf5cd7..1f2cda680 100644
--- a/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/util/CitizenCardServletUtils.java
+++ b/id/server/modules/moa-id-modul-citizencard_authentication/src/main/java/at/gv/egovernment/moa/id/util/CitizenCardServletUtils.java
@@ -50,7 +50,6 @@
 package at.gv.egovernment.moa.id.util;
 
 import java.io.IOException;
-import java.io.OutputStream;
 import java.net.URLEncoder;
 
 import javax.servlet.http.HttpServletResponse;
@@ -93,12 +92,11 @@ public class CitizenCardServletUtils extends ServletUtils{
       resp.addHeader("Location", dataURL);
       
       //TODO test impact of explicit setting charset with older versions of BKUs (HotSign)
-      resp.setContentType(MediaType.XML_UTF_8.toString());
       
-      OutputStream out = resp.getOutputStream();
-      out.write(createXMLSignatureRequestOrRedirect.getBytes("UTF-8"));
-      out.flush();
-      out.close();
+      byte[] content = createXMLSignatureRequestOrRedirect.getBytes("UTF-8");
+      resp.setContentType(MediaType.XML_UTF_8.toString());
+      resp.setContentLength(content.length);
+      resp.getOutputStream().write(content);
       Logger.debug("Finished POST " + servletName);
       
     } else {
@@ -129,12 +127,11 @@ public class CitizenCardServletUtils extends ServletUtils{
       resp.addHeader("Location", dataURL);
       
       //TODO test impact of explicit setting charset with older versions of BKUs (HotSign)
+      
+      byte[] content = createXMLSignatureRequestOrRedirect.getBytes("UTF-8");
       resp.setContentType(MediaType.XML_UTF_8.toString());
-            
-      OutputStream out = resp.getOutputStream();
-      out.write(createXMLSignatureRequestOrRedirect.getBytes("UTF-8"));
-      out.flush();
-      out.close();
+      resp.setContentLength(content.length);
+      resp.getOutputStream().write(content);
       Logger.debug("Finished POST " + servletName);
     
   }
@@ -156,16 +153,14 @@ public class CitizenCardServletUtils extends ServletUtils{
          IOException { 
 	  resp.setStatus(200);
 	  Logger.debug("ContentType set to: application/x-www-form-urlencoded");
-	
-	  resp.setContentType("application/x-www-form-urlencoded");
-	  
-	  String content = "XMLRequest=" + URLEncoder.encode(createXMLSignatureRequestOrRedirect, "UTF-8") + "&" + 
+		  	  
+	  String respString = "XMLRequest=" + URLEncoder.encode(createXMLSignatureRequestOrRedirect, "UTF-8") + "&" + 
 	  					"DataURL=" + URLEncoder.encode(dataURL, "UTF-8");
       
-      OutputStream out = resp.getOutputStream();
-      out.write(content.getBytes("UTF-8"));
-      out.flush();
-      out.close();
+      byte[] content = respString.getBytes("UTF-8");
+      resp.setContentType("application/x-www-form-urlencoded");
+      resp.setContentLength(content.length);
+      resp.getOutputStream().write(content);	  
       Logger.debug("Finished POST " + servletName);
     
   }
diff --git a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/auth/modules/eidas/tasks/GenerateAuthnRequestTask.java b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/auth/modules/eidas/tasks/GenerateAuthnRequestTask.java
index a3fd51c4c..ea8e88278 100644
--- a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/auth/modules/eidas/tasks/GenerateAuthnRequestTask.java
+++ b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/auth/modules/eidas/tasks/GenerateAuthnRequestTask.java
@@ -248,8 +248,11 @@ public class GenerateAuthnRequestTask extends AbstractAuthServletTask {
 
 	            Logger.debug("Sending html content: " + writer.getBuffer().toString());
 	            
+	            
+	            byte[] content = writer.getBuffer().toString().getBytes("UTF-8");	            
 	            response.setContentType(MediaType.HTML_UTF_8.toString());
-	            response.getOutputStream().write(writer.getBuffer().toString().getBytes("UTF-8"));
+	            response.setContentLength(content.length);
+	            response.getOutputStream().write(content);
 
 	            revisionsLogger.logEvent(oaConfig, pendingReq, 
 						MOAIDEventConstants.AUTHPROCESS_PEPS_REQUESTED,
diff --git a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/EIDASProtocol.java b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/EIDASProtocol.java
index 9fab58f94..13e64cdd0 100644
--- a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/EIDASProtocol.java
+++ b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/EIDASProtocol.java
@@ -386,9 +386,11 @@ public class EIDASProtocol extends AbstractAuthProtocolModulController {
 
                 Logger.trace("Sending html content  : " + new String(writer.getBuffer()));
 
-                response.getOutputStream().write(writer.getBuffer().toString().getBytes("UTF-8"));
+                byte[] content = writer.getBuffer().toString().getBytes("UTF-8");             
                 response.setContentType(MediaType.TEXT_HTML.getType());
-        		
+                response.setContentLength(content.length);
+                response.getOutputStream().write(content);
+                
                 return true;
                 
         	} catch (Exception e1 ) { 
diff --git a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/eIDASAuthenticationRequest.java b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/eIDASAuthenticationRequest.java
index 0f17eccab..22ac37604 100644
--- a/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/eIDASAuthenticationRequest.java
+++ b/id/server/modules/moa-id-module-eIDAS/src/main/java/at/gv/egovernment/moa/id/protocols/eidas/eIDASAuthenticationRequest.java
@@ -252,8 +252,11 @@ public class eIDASAuthenticationRequest implements IAction {
 
             Logger.trace("Sending html content  : " + new String(writer.getBuffer()));
 
-            httpResp.getOutputStream().write(writer.getBuffer().toString().getBytes("UTF-8"));
+            byte[] content = writer.getBuffer().toString().getBytes("UTF-8");
             httpResp.setContentType(MediaType.TEXT_HTML.getType());
+            httpResp.setContentLength(content.length);
+            httpResp.getOutputStream().write(content);
+            
 
         } catch (Exception e) {
             Logger.error("Velocity error: " + e.getMessage());			
diff --git a/id/server/modules/moa-id-module-elga_mandate_service/src/main/java/at/gv/egovernment/moa/id/auth/modules/elgamandates/controller/ELGAMandateMetadataController.java b/id/server/modules/moa-id-module-elga_mandate_service/src/main/java/at/gv/egovernment/moa/id/auth/modules/elgamandates/controller/ELGAMandateMetadataController.java
index 5720e4827..ca7401ab7 100644
--- a/id/server/modules/moa-id-module-elga_mandate_service/src/main/java/at/gv/egovernment/moa/id/auth/modules/elgamandates/controller/ELGAMandateMetadataController.java
+++ b/id/server/modules/moa-id-module-elga_mandate_service/src/main/java/at/gv/egovernment/moa/id/auth/modules/elgamandates/controller/ELGAMandateMetadataController.java
@@ -82,9 +82,11 @@ public class ELGAMandateMetadataController extends AbstractController {
 				String xmlMetadata = metadatabuilder.buildPVPMetadata(metadataConfig);
 				
 				//write response
+				byte[] content = xmlMetadata.getBytes("UTF-8");
+				resp.setStatus(HttpServletResponse.SC_OK);
+				resp.setContentLength(content.length);
 				resp.setContentType(MediaType.XML_UTF_8.toString());
-				resp.getOutputStream().write(xmlMetadata.getBytes("UTF-8"));
-				resp.getOutputStream().close();
+				resp.getOutputStream().write(content);
 
 			}
 			
diff --git a/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20Protocol.java b/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20Protocol.java
index e6ccc67b7..118c53f6b 100644
--- a/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20Protocol.java
+++ b/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20Protocol.java
@@ -225,14 +225,14 @@ public class OAuth20Protocol extends AbstractAuthProtocolModulController {
 			// create response
 			JsonObject jsonObject = new JsonObject();
 			OAuth20Util.addProperytiesToJsonObject(jsonObject, params);
-			String jsonResponse = jsonObject.toString();
-			Logger.debug("JSON Response: " + jsonResponse);
+			byte[] jsonResponse = jsonObject.toString().getBytes("UTF-8");
+			Logger.debug("JSON Response: " + new String(jsonResponse));
 			
 			// write respone to http response
 			response.setContentType("application/json");
+			response.setContentLength(jsonResponse.length);
 			response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
-			response.getOutputStream().print(jsonResponse);
-			response.getOutputStream().close();
+			response.getOutputStream().write(jsonResponse);
 			
 			return true;
 		}
diff --git a/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20TokenAction.java b/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20TokenAction.java
index 9d78418cd..985e1d1c5 100644
--- a/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20TokenAction.java
+++ b/id/server/modules/moa-id-module-openID/src/main/java/at/gv/egovernment/moa/id/protocols/oauth20/protocol/OAuth20TokenAction.java
@@ -83,14 +83,14 @@ class OAuth20TokenAction implements IAction {
 			// create response
 			JsonObject jsonObject = new JsonObject();
 			OAuth20Util.addProperytiesToJsonObject(jsonObject, auth20SessionObject.getAuthDataSession());
-			String jsonResponse = jsonObject.toString();
-			Logger.debug("JSON Response: " + jsonResponse);
+			byte[] jsonResponse = jsonObject.toString().getBytes("UTF-8");
+			Logger.debug("JSON Response: " + new String(jsonResponse));
 			
 			// write respone to http response
 			httpResp.setContentType("application/json");
-			httpResp.setStatus(HttpServletResponse.SC_OK);
-			httpResp.getOutputStream().print(jsonResponse);
-			httpResp.getOutputStream().close();
+			httpResp.setContentLength(jsonResponse.length);
+			httpResp.setStatus(HttpServletResponse.SC_OK);			
+			httpResp.getOutputStream().write(jsonResponse);
 			
 			return null;
 		}
diff --git a/id/server/modules/moa-id-modules-federated_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/federatedauth/controller/FederatedAuthMetadataController.java b/id/server/modules/moa-id-modules-federated_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/federatedauth/controller/FederatedAuthMetadataController.java
index 02356d74a..e86d31708 100644
--- a/id/server/modules/moa-id-modules-federated_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/federatedauth/controller/FederatedAuthMetadataController.java
+++ b/id/server/modules/moa-id-modules-federated_authentication/src/main/java/at/gv/egovernment/moa/id/auth/modules/federatedauth/controller/FederatedAuthMetadataController.java
@@ -82,9 +82,11 @@ public class FederatedAuthMetadataController extends AbstractController {
 				String xmlMetadata = metadatabuilder.buildPVPMetadata(metadataConfig);
 				
 				//write response
+				byte[] content = xmlMetadata.getBytes("UTF-8");
+				resp.setStatus(HttpServletResponse.SC_OK);
+				resp.setContentLength(content.length);
 				resp.setContentType(MediaType.XML_UTF_8.toString());
-				resp.getOutputStream().write(xmlMetadata.getBytes("UTF-8"));
-				resp.getOutputStream().close();
+				resp.getOutputStream().write(content);
 
 			}
 			
diff --git a/id/server/modules/moa-id-modules-saml1/src/main/java/at/gv/egovernment/moa/id/protocols/saml1/GetAuthenticationDataService.java b/id/server/modules/moa-id-modules-saml1/src/main/java/at/gv/egovernment/moa/id/protocols/saml1/GetAuthenticationDataService.java
index 893799b5d..13df30862 100644
--- a/id/server/modules/moa-id-modules-saml1/src/main/java/at/gv/egovernment/moa/id/protocols/saml1/GetAuthenticationDataService.java
+++ b/id/server/modules/moa-id-modules-saml1/src/main/java/at/gv/egovernment/moa/id/protocols/saml1/GetAuthenticationDataService.java
@@ -344,8 +344,11 @@ public class GetAuthenticationDataService extends AbstractController implements
 			VelocityEngine engine = VelocityProvider.getClassPathVelocityEngine();		
 			BufferedReader reader = new BufferedReader(new InputStreamReader(is ));				
 			StringWriter writer = new StringWriter();						
-			engine.evaluate(context, writer, "SAML1 GetAuthenticationData", reader);		            
-			httpResp.getOutputStream().write(writer.toString().getBytes("UTF-8"));
+			engine.evaluate(context, writer, "SAML1 GetAuthenticationData", reader);
+			
+			byte[] content = writer.toString().getBytes("UTF-8");			
+			httpResp.setContentLength(content.length);
+			httpResp.getOutputStream().write(content);
 			
 		} catch (Exception e) {
 			Logger.error("SAML1 GetAuthenticationData has an error:", e);
diff --git a/id/server/modules/module-monitoring/src/main/java/at/gv/egovernment/moa/id/auth/servlet/MonitoringController.java b/id/server/modules/module-monitoring/src/main/java/at/gv/egovernment/moa/id/auth/servlet/MonitoringController.java
index 8d324b535..b232b9512 100644
--- a/id/server/modules/module-monitoring/src/main/java/at/gv/egovernment/moa/id/auth/servlet/MonitoringController.java
+++ b/id/server/modules/module-monitoring/src/main/java/at/gv/egovernment/moa/id/auth/servlet/MonitoringController.java
@@ -112,13 +112,12 @@ public class MonitoringController {
 		  Logger.warn("Monitoring Servlet found some Error: " + errorMessage);
 		  resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 		  resp.setContentType("text/html;charset=UTF-8");
-		  PrintWriter out;
-		  try {
-			  out = new PrintWriter(resp.getOutputStream());
+		  resp.setCharacterEncoding("UTF-8");
+		 		  
+		  try {			  
 			  for (String error : errorMessage)
-				  out.write(error + "<br>");
-			  out.flush();
-			  
+				  resp.getWriter().write(error + "<br>");
+				 
 		  } catch (IOException e) {
 			  Logger.warn("Internal Monitoring Servlet Error. ", e);
 		  }