Print an error if build for 2.10 and 2.11 is spotted.

Author: ScrapCodes

bin/compute-classpath.sh

@@ -37,8 +37,14 @@ fi
 if [ -z "$SPARK_SCALA_VERSION" ]; then
 
     ASSEMBLY_DIR2="$FWDIR/assembly/target/scala-2.11"
-    # if scala-2.11 directory for assembly exists,  we use that. Otherwise we default to 
-    # scala 2.10.
+    ASSEMBLY_DIR1="$FWDIR/assembly/target/scala-2.10"
+    
+    if [[ -d "$ASSEMBLY_DIR2" && -d "$ASSEMBLY_DIR1" ]]; then
+        echo -e "Presence of build for both scala versions(SCALA 2.10 and SCALA 2.11) detected." 1>&2
+        echo -e 'Either clean one of them or, export SPARK_SCALA_VERSION=2.11 in spark-env.sh.' 1>&2
+        exit 1
+    fi
+
     if [ -d "$ASSEMBLY_DIR2" ]; then
         SPARK_SCALA_VERSION="2.11"
     else

examples/pom.xml

@@ -128,7 +128,6 @@
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-server</artifactId>
     </dependency>
-    <dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-math3</artifactId>