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rombert pushed a commit to annotated tag 
org.apache.sling.scripting.sightly.repl-1.0.2
in repository 
https://gitbox.apache.org/repos/asf/sling-org-apache-sling-scripting-sightly-repl.git

commit 6bb0ca0f7ea73093c33896b726d5fc1ac0c84ce0
Author: Radu Cotescu <[email protected]>
AuthorDate: Thu Oct 8 10:53:43 2015 +0000

    SLING-5126 - Provide information on the Sightly REPL Java tab on how to 
enable source code generation
    
    * added link to engine configuration
    
    git-svn-id: 
https://svn.apache.org/repos/asf/sling/trunk/bundles/scripting/sightly/repl@1707473
 13f79535-47bb-0310-9956-ffa450edef68
---
 .../scripting/sightly/repl/REPLJavaSourceCodeServlet.java  | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git 
a/src/main/java/org/apache/sling/scripting/sightly/repl/REPLJavaSourceCodeServlet.java
 
b/src/main/java/org/apache/sling/scripting/sightly/repl/REPLJavaSourceCodeServlet.java
index 35411c3..e8a1939 100644
--- 
a/src/main/java/org/apache/sling/scripting/sightly/repl/REPLJavaSourceCodeServlet.java
+++ 
b/src/main/java/org/apache/sling/scripting/sightly/repl/REPLJavaSourceCodeServlet.java
@@ -63,7 +63,18 @@ public class REPLJavaSourceCodeServlet extends 
SlingSafeMethodsServlet {
     @Override
     protected void doGet(SlingHttpServletRequest request, 
SlingHttpServletResponse response) throws ServletException, IOException {
         response.setContentType("text/plain");
-        response.getWriter().write(getClassSourceCode());
+        String sourceCode = getClassSourceCode();
+        if (sourceCode.length() == 0) {
+            StringBuilder configurationLink = new StringBuilder();
+            
configurationLink.append(request.getScheme()).append("://").append(request.getServerName());
+            if (request.getServerPort() != 80) {
+                configurationLink.append(":").append(request.getServerPort());
+            }
+            
configurationLink.append(request.getContextPath()).append("/system/console/configMgr/org.apache.sling.scripting.sightly.impl.engine.SightlyEngineConfiguration");
+            response.getWriter().write("/**\n * Please enable development mode 
at\n * " + configurationLink.toString() + "\n */");
+        } else {
+            response.getWriter().write(getClassSourceCode());
+        }
     }
 
     private String getClassSourceCode() {
@@ -74,7 +85,6 @@ public class REPLJavaSourceCodeServlet extends 
SlingSafeMethodsServlet {
                     return IOUtils.toString(new FileInputStream(classFile), 
"UTF-8");
                 } catch (IOException e) {
                     LOGGER.error("Unable to read file " + 
classFile.getAbsolutePath(), e);
-                    return "";
                 }
             }
         }

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