addressing @jochenberger's code review comments, Created by... is IntelliJ auto-creation -- added Apache license headers

json-path/src/main/java/com/jayway/jsonpath/internal/function/latebinding/ILateBindingValue.java

@@ -1,9 +1,22 @@
+/*
+ * Copyright 2011 the original author or authors.
+ * Licensed 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 com.jayway.jsonpath.internal.function.latebinding;
 
 /**
  * Obtain the late binding value at runtime rather than storing the value in the cache thus trashing the cache
  *
- * Created by mattg on 3/27/17.
  */
 public interface ILateBindingValue {
     /**

json-path/src/main/java/com/jayway/jsonpath/internal/function/latebinding/JsonLateBindingValue.java

@@ -1,10 +1,25 @@
+/*
+ * Copyright 2011 the original author or authors.
+ * Licensed 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 com.jayway.jsonpath.internal.function.latebinding;
 
 import com.jayway.jsonpath.internal.function.Parameter;
 import com.jayway.jsonpath.spi.json.JsonProvider;
 
 /**
- * Created by mattg on 3/27/17.
+ * Defines the JSON document Late binding approach to function arguments.
+ *
  */
 public class JsonLateBindingValue implements ILateBindingValue {
     private final JsonProvider jsonProvider;

json-path/src/main/java/com/jayway/jsonpath/internal/function/latebinding/PathLateBindingValue.java

@@ -1,3 +1,17 @@
+/*
+ * Copyright 2011 the original author or authors.
+ * Licensed 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 com.jayway.jsonpath.internal.function.latebinding;
 
 import com.jayway.jsonpath.Configuration;
@@ -10,7 +24,6 @@ import com.jayway.jsonpath.internal.function.ParamType;
  *
  * Acts like a lambda function with references, but since we're supporting JDK 6+, we're left doing this...
  *
- * Created by mattg on 3/27/17.
  */
 public class PathLateBindingValue implements ILateBindingValue {
     private final Path path;

json-path/src/main/java/com/jayway/jsonpath/internal/function/text/Concatenate.java

@@ -27,8 +27,9 @@ public class Concatenate implements PathFunction {
         }
         if (parameters != null) {
             for (Parameter param : parameters) {
-                if (param.getValue() != null) {
+		Object value = param.getValue();
-                    result.append(param.getValue().toString());
+                if (value != null) {
+                    result.append(value.toString());
                 }
             }
         }