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

commit 871b6f39088a734b99168795f8295ac5dec3ac01
Author: Chetan Mehrotra <[email protected]>
AuthorDate: Sat Oct 8 09:29:53 2016 +0000

    SLING-6118 - Handle empty tracer config header gracefully
    
    git-svn-id: 
https://svn.apache.org/repos/asf/sling/trunk/contrib/extensions/tracer@1763881 
13f79535-47bb-0310-9956-ffa450edef68
---
 .../sling/tracer/internal/JSONRecording.java       | 16 +------
 .../apache/sling/tracer/internal/LogTracer.java    |  5 +++
 .../org/apache/sling/tracer/internal/Util.java     | 47 +++++++++++++++++++++
 .../org/apache/sling/tracer/internal/UtilTest.java | 49 ++++++++++++++++++++++
 4 files changed, 103 insertions(+), 14 deletions(-)

diff --git a/src/main/java/org/apache/sling/tracer/internal/JSONRecording.java 
b/src/main/java/org/apache/sling/tracer/internal/JSONRecording.java
index 21d99d4..2941caf 100644
--- a/src/main/java/org/apache/sling/tracer/internal/JSONRecording.java
+++ b/src/main/java/org/apache/sling/tracer/internal/JSONRecording.java
@@ -53,6 +53,8 @@ import org.slf4j.helpers.FormattingTuple;
 import org.slf4j.helpers.MessageFormatter;
 
 import static com.google.common.base.Preconditions.checkArgument;
+import static org.apache.sling.tracer.internal.Util.nullSafeString;
+import static org.apache.sling.tracer.internal.Util.nullSafeTrim;
 
 class JSONRecording implements Recording, Comparable<JSONRecording> {
     private static final String[] QUERY_API_PKGS = {
@@ -389,18 +391,4 @@ class JSONRecording implements Recording, 
Comparable<JSONRecording> {
         }
     }
 
-    private static String nullSafeTrim(String s){
-        if(s == null){
-            return "";
-        }
-        return s.trim();
-    }
-
-    private static String nullSafeString(Object o){
-        if (o != null){
-            return o.toString();
-        }
-        return null;
-    }
-
 }
diff --git a/src/main/java/org/apache/sling/tracer/internal/LogTracer.java 
b/src/main/java/org/apache/sling/tracer/internal/LogTracer.java
index 59c647c..c95d7fd 100644
--- a/src/main/java/org/apache/sling/tracer/internal/LogTracer.java
+++ b/src/main/java/org/apache/sling/tracer/internal/LogTracer.java
@@ -58,6 +58,8 @@ import 
org.osgi.service.http.whiteboard.HttpWhiteboardConstants;
 import org.slf4j.LoggerFactory;
 import org.slf4j.Marker;
 
+import static org.apache.sling.tracer.internal.Util.trimToNull;
+
 /**
  * Tracer provides support for enabling the logs for specific category at 
specific level and
  * only for specific request. It provides a very fine level of control via 
config provided
@@ -224,6 +226,9 @@ public class LogTracer {
 
     TracerContext getTracerContext(String tracerSetNames, String tracerConfig, 
Recording recording) {
         //No config or tracer set name provided. So tracing not required
+        tracerConfig = trimToNull(tracerConfig);
+        tracerSetNames = trimToNull(tracerSetNames);
+
         if (tracerSetNames == null && tracerConfig == null) {
             return null;
         }
diff --git a/src/main/java/org/apache/sling/tracer/internal/Util.java 
b/src/main/java/org/apache/sling/tracer/internal/Util.java
new file mode 100644
index 0000000..617881e
--- /dev/null
+++ b/src/main/java/org/apache/sling/tracer/internal/Util.java
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.sling.tracer.internal;
+
+class Util {
+    static String trimToNull(String s) {
+        if (s == null) {
+            return null;
+        }
+        s = s.trim();
+        if (s.isEmpty()) {
+            return null;
+        }
+        return s;
+    }
+
+    static String nullSafeString(Object o){
+        if (o != null){
+            return o.toString();
+        }
+        return null;
+    }
+
+    static String nullSafeTrim(String s){
+        if(s == null){
+            return "";
+        }
+        return s.trim();
+    }
+}
diff --git a/src/test/java/org/apache/sling/tracer/internal/UtilTest.java 
b/src/test/java/org/apache/sling/tracer/internal/UtilTest.java
new file mode 100644
index 0000000..8dd878e
--- /dev/null
+++ b/src/test/java/org/apache/sling/tracer/internal/UtilTest.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.sling.tracer.internal;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class UtilTest {
+
+    @Test
+    public void trimToNull() throws Exception{
+        assertEquals(null, Util.trimToNull(null));
+        assertEquals(null, Util.trimToNull(""));
+        assertEquals("foo", Util.trimToNull("foo"));
+        assertEquals("foo", Util.trimToNull(" foo"));
+    }
+
+    @Test
+    public void nullSafeString() throws Exception{
+        assertEquals(null, Util.nullSafeString(null));
+        assertEquals("foo", Util.nullSafeString("foo"));
+        assertEquals("1", Util.nullSafeString(1));
+    }
+
+    @Test
+    public void nullSafeTrim() throws Exception{
+        assertEquals("", Util.nullSafeTrim(null));
+        assertEquals("foo", Util.nullSafeTrim(" foo"));
+    }
+
+}
\ No newline at end of file

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