Fixes dependency clash

apps/showcase/pom.xml

@@ -171,11 +171,6 @@
             <artifactId>hibernate-validator</artifactId>
             <version>5.1.3.Final</version>
         </dependency>
-        <dependency>
-            <groupId>org.glassfish</groupId>
-            <artifactId>javax.el</artifactId>
-            <version>3.0.0</version>
-        </dependency>
 
         <!-- The Servlet API mocks in Spring Framework 4.x only supports Servlet 3.0 and higher.
            This is only necessary in tests-->

plugins/bean-validation/pom.xml

@@ -58,7 +58,6 @@
         <dependency>
             <groupId>org.glassfish</groupId>
             <artifactId>javax.el</artifactId>
-            <version>3.0.0</version>
             <scope>test</scope>
         </dependency>
 

plugins/tiles/pom.xml

@@ -73,11 +73,10 @@
             <scope>provided</scope>
         </dependency>
         <dependency>
-            <groupId>javax.el</groupId>
-            <artifactId>el-api</artifactId>
-            <scope>provided</scope>
+            <groupId>org.glassfish</groupId>
+            <artifactId>javax.el</artifactId>
+            <optional>true</optional>
         </dependency>
-
     </dependencies>
     <properties>
     	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

pom.xml

@@ -577,10 +577,9 @@
             </dependency>
 
             <dependency>
-                <groupId>javax.el</groupId>
-                <artifactId>el-api</artifactId>
-                <version>1.0</version>
-                <scope>provided</scope>
+                <groupId>org.glassfish</groupId>
+                <artifactId>javax.el</artifactId>
+                <version>3.0.0</version>
             </dependency>
 
             <dependency>