diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/model/Explorer.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/model/Explorer.kt
index 289b71c222..c70fe426ed 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/model/Explorer.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/model/Explorer.kt
@@ -18,16 +18,16 @@ class Explorer(val explorerController: ExplorerController) : AutoCloseable {
             return
         }
 
-        val p = explorerController.execute(
-              config.explorerDir,
+        val p = explorerController.process(
               "--host=localhost",
               "--port=${config.artemisPort}",
               "--username=${config.user["user"]}",
               "--password=${config.user["password"]}",
               "--certificatesDir=${config.ssl.certificatesDirectory}",
               "--keyStorePassword=${config.ssl.keyStorePassword}",
-              "--trustStorePassword=${config.ssl.trustStorePassword}"
-        )
+              "--trustStorePassword=${config.ssl.trustStorePassword}")
+                .directory(explorerDir)
+                .start()
         process = p
 
         log.info("Launched Node Explorer for '{}'", config.legalName)
diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/model/ExplorerController.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/model/ExplorerController.kt
index eaf56e3276..b0325be4b8 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/model/ExplorerController.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/model/ExplorerController.kt
@@ -1,8 +1,6 @@
 package net.corda.demobench.model
 
 import tornadofx.Controller
-import java.nio.file.Path
-import java.nio.file.Paths
 
 class ExplorerController : Controller() {
 
@@ -13,7 +11,7 @@ class ExplorerController : Controller() {
         log.info("Explorer JAR: $explorerPath")
     }
 
-    internal fun execute(cwd: Path, vararg args: String) = jvm.execute(explorerPath, cwd, *args)
+    internal fun process(vararg args: String) = jvm.processFor(explorerPath, *args)
 
     fun explorer() = Explorer(this)
 
diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/model/JVMConfig.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/model/JVMConfig.kt
index 08cc1b812b..4b2eb284db 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/model/JVMConfig.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/model/JVMConfig.kt
@@ -18,8 +18,8 @@ class JVMConfig : Controller() {
         return arrayOf(javaPath.toString(), "-jar", jarPath.toString(), *args)
     }
 
-    fun execute(jarPath: Path, cwd: Path, vararg args: String): Process {
-        return Runtime.getRuntime().exec(commandFor(jarPath, *args), null, cwd.toFile())
+    fun processFor(jarPath: Path, vararg args: String): ProcessBuilder {
+        return ProcessBuilder(commandFor(jarPath, *args).toList())
     }
 
 }
diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServer.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServer.kt
index e60c12eff6..1dda1045d1 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServer.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServer.kt
@@ -18,7 +18,9 @@ class WebServer(val webServerController: WebServerController) : AutoCloseable {
             return
         }
 
-        val p = webServerController.execute(config.nodeDir)
+        val p = webServerController.process()
+            .directory(nodeDir)
+            .start()
         process = p
 
         log.info("Launched Web Server for '{}'", config.legalName)
diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServerController.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServerController.kt
index dd2118bc36..60718e74d4 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServerController.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/model/WebServerController.kt
@@ -1,7 +1,6 @@
 package net.corda.demobench.model
 
 import tornadofx.Controller
-import java.nio.file.Path
 
 class WebServerController : Controller() {
 
@@ -12,7 +11,7 @@ class WebServerController : Controller() {
         log.info("Web Server JAR: $cordaPath")
     }
 
-    internal fun execute(cwd: Path) = jvm.execute(cordaPath, cwd, "--webserver")
+    internal fun process() = jvm.processFor(cordaPath, "--webserver")
 
     fun webServer() = WebServer(this)