Responding to Matei's review

core/src/main/scala/spark/ui/env/EnvironmentUI.scala

@@ -5,6 +5,7 @@ import javax.servlet.http.HttpServletRequest
 import org.eclipse.jetty.server.Handler
 
 import scala.collection.JavaConversions._
+import scala.util.Properties
 
 import spark.ui.JettyUtils._
 import spark.ui.UIUtils.headerSparkPage
@@ -21,19 +22,27 @@ private[spark] class EnvironmentUI(sc: SparkContext) {
   )
 
   def envDetails(request: HttpServletRequest): Seq[Node] = {
-    val properties = System.getProperties.iterator.toSeq
+    val jvmInformation = Seq(
+      ("Java Version", "%s (%s)".format(Properties.javaVersion, Properties.javaVendor)),
+      ("Java Home", Properties.javaHome),
+      ("Scala Version", Properties.versionString),
+      ("Scala Home", Properties.scalaHome)
+    )
+    def jvmRow(kv: (String, String)) = <tr><td>{kv._1}</td><td>{kv._2}</td></tr>
+    def jvmTable = UIUtils.listingTable(Seq("Name", "Value"), jvmRow, jvmInformation)
 
+    val properties = System.getProperties.iterator.toSeq
     val classPathProperty = properties
         .filter{case (k, v) => k.contains("java.class.path")}
         .headOption
         .getOrElse("", "")
-    val sparkProperties = properties.filter(_._1.contains("spark"))
+    val sparkProperties = properties.filter(_._1.startsWith("spark"))
     val otherProperties = properties.diff(sparkProperties :+ classPathProperty)
 
     val propertyHeaders = Seq("Name", "Value")
     def propertyRow(kv: (String, String)) = <tr><td>{kv._1}</td><td>{kv._2}</td></tr>
-    val propertyTable = UIUtils.listingTable(
-      propertyHeaders, propertyRow, sparkProperties ++ otherProperties)
+    val sparkPropertyTable = UIUtils.listingTable(propertyHeaders, propertyRow, sparkProperties)
+    val otherPropertyTable = UIUtils.listingTable(propertyHeaders, propertyRow, otherProperties)
 
     val classPathEntries = classPathProperty._2
         .split(System.getProperty("path.separator", ":"))
@@ -49,7 +58,9 @@ private[spark] class EnvironmentUI(sc: SparkContext) {
 
     val content =
       <span>
-        <h2>System Properties</h2> {propertyTable}
+        <h2>Runtime Information</h2> {jvmTable}
+        <h2>Spark Properties</h2> {sparkPropertyTable}
+        <h2>System Properties</h2> {otherPropertyTable}
         <h2>Classpath Entries</h2> {classPathTable}
       </span>