Use the prop-types package. Removed strict directives, as strict mode is default for ES6 modules.

src/main/webapp/js/app.js

-'use strict';
-
 import React from 'react';
 import ReactDOM from 'react-dom';
 import {PageHeader} from 'react-bootstrap';

src/main/webapp/js/components/InfoMessage.js

-'use strict';
-
 import React from 'react';
 import {Alert} from 'react-bootstrap';
 

src/main/webapp/js/components/Teachers.js

-'use strict';
-
 import React from 'react';
+import PropTypes from "prop-types";
 import {Panel, Table} from 'react-bootstrap';
 
-export default class Teachers extends React.Component {
-    static propTypes = {
-        teachers: React.PropTypes.array.isRequired
-    };
+class Teachers extends React.Component {
 
     constructor(props) {
         super(props);
@@ -31,17 +27,21 @@ export default class Teachers extends React.Component {
     }
 
     _renderRows() {
-        var rows = [],
+        const rows = [],
             teachers = this.props.teachers;
-        for (var i = 0, len = teachers.length; i < len; i++) {
+        for (let i = 0, len = teachers.length; i < len; i++) {
             rows.push(<Row key={'teacher-' + teachers[i].id} teacher={teachers[i]}/>);
         }
         return rows;
     }
 }
 
+Teachers.propTypes = {
+    teachers: PropTypes.array.isRequired
+};
+
 const Row = (props) => {
-    var teacher = props.teacher;
+    const teacher = props.teacher;
     return <tr>
         <td>{teacher.firstName}</td>
         <td>{teacher.lastName}</td>
@@ -51,5 +51,7 @@ const Row = (props) => {
 };
 
 Row.propTypes = {
-    teacher: React.PropTypes.object.isRequired
+    teacher: PropTypes.object.isRequired
 };
+
+export default Teachers;

src/main/webapp/js/components/TeachersController.js

-'use strict';
-
 import React from 'react';
 import Reflux from "reflux";
 

src/main/webapp/js/stores/TeacherStore.js

-'use strict';
-
 import Reflux from 'reflux';
 import request from 'superagent';
 

src/main/webapp/package.json

@@ -4,6 +4,7 @@
   "description": "System setup sample project for EAR.",
   "main": "js/app.js",
   "dependencies": {
+    "prop-types": "~15.5.10",
     "react": "~15.4.2",
     "react-dom": "~15.4.2",
     "keymirror": "~0.1.0",
@@ -17,7 +18,7 @@
     "remarkable": "~1.6.2",
     "js-cookie": "~2.1.0",
     "halogen": "https://kbss.felk.cvut.cz/dist/halogen-0.2.1.tgz",
-	"babel-runtime": "^6.7.5"
+    "babel-runtime": "^6.7.5"
   },
   "devDependencies": {
     "babel-core": "^6.7.5",