diff --git a/node/src/integration-test/kotlin/net/corda/node/MockNetworkCustomSerializerTest.kt b/node/src/integration-test/kotlin/net/corda/node/MockNetworkCustomSerializerTest.kt
new file mode 100644
index 0000000000..abb7ea49a4
--- /dev/null
+++ b/node/src/integration-test/kotlin/net/corda/node/MockNetworkCustomSerializerTest.kt
@@ -0,0 +1,63 @@
+package net.corda.node
+
+import net.corda.contracts.serialization.custom.Currantsy
+import net.corda.core.contracts.TransactionVerificationException.ContractRejection
+import net.corda.flows.serialization.custom.CustomSerializerFlow
+import net.corda.testing.common.internal.testNetworkParameters
+import net.corda.testing.node.MockNetwork
+import net.corda.testing.node.MockNetworkParameters
+import net.corda.testing.node.internal.cordappWithPackages
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.BeforeClass
+import org.junit.Test
+import java.util.concurrent.ExecutionException
+import kotlin.test.assertFailsWith
+
+@Suppress("FunctionName")
+class MockNetworkCustomSerializerTest {
+    companion object {
+        private const val CURRANTS = 5000L
+
+        @JvmField
+        val currantsy = Currantsy(CURRANTS)
+
+        @BeforeClass
+        @JvmStatic
+        fun checkData() {
+            assertNotCordaSerializable<Currantsy>()
+        }
+    }
+
+    private lateinit var mockNetwork: MockNetwork
+
+    @Before
+    fun setup() {
+        mockNetwork = MockNetwork(
+            MockNetworkParameters(
+                networkParameters = testNetworkParameters(minimumPlatformVersion = 4),
+                cordappsForAllNodes = listOf(
+                    cordappWithPackages("net.corda.flows.serialization.custom").signed(),
+                    cordappWithPackages("net.corda.contracts.serialization.custom").signed()
+                )
+            )
+        )
+    }
+
+    @After
+    fun shutdown() {
+        mockNetwork.stopNodes()
+    }
+
+    @Test(timeout = 300_000)
+    fun `flow with custom serializer mock network`() {
+        val a = mockNetwork.createPartyNode()
+        val ex = assertFailsWith<ExecutionException> {
+            a.startFlow(CustomSerializerFlow(currantsy)).get()
+        }
+        assertThat(ex)
+            .hasCauseExactlyInstanceOf(ContractRejection::class.java)
+            .hasMessageContaining("Too many currants! $currantsy is unraisinable!")
+    }
+}
\ No newline at end of file
diff --git a/node/src/integration-test/kotlin/net/corda/node/MockNetworkSerializationWhitelistTest.kt b/node/src/integration-test/kotlin/net/corda/node/MockNetworkSerializationWhitelistTest.kt
new file mode 100644
index 0000000000..31d8787505
--- /dev/null
+++ b/node/src/integration-test/kotlin/net/corda/node/MockNetworkSerializationWhitelistTest.kt
@@ -0,0 +1,66 @@
+package net.corda.node
+
+import net.corda.contracts.serialization.whitelist.WhitelistData
+import net.corda.core.contracts.TransactionVerificationException.ContractRejection
+import net.corda.flows.serialization.whitelist.WhitelistFlow
+import net.corda.testing.common.internal.testNetworkParameters
+import net.corda.testing.node.MockNetwork
+import net.corda.testing.node.MockNetworkParameters
+import net.corda.testing.node.internal.cordappWithPackages
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.BeforeClass
+import org.junit.Test
+import java.util.concurrent.ExecutionException
+import kotlin.test.assertFailsWith
+
+@Suppress("FunctionName")
+class MockNetworkSerializationWhitelistTest {
+    companion object {
+        private const val DATA = 654321L
+
+        @JvmField
+        val contractCordapp = cordappWithPackages("net.corda.contracts.serialization.whitelist").signed()
+
+        @JvmField
+        val workflowCordapp = cordappWithPackages("net.corda.flows.serialization.whitelist").signed()
+
+        @JvmField
+        val badData = WhitelistData(DATA)
+
+        @BeforeClass
+        @JvmStatic
+        fun checkData() {
+            assertNotCordaSerializable<WhitelistData>()
+        }
+    }
+
+    private lateinit var mockNetwork: MockNetwork
+
+    @Before
+    fun setup() {
+        mockNetwork = MockNetwork(
+            MockNetworkParameters(
+                networkParameters = testNetworkParameters(minimumPlatformVersion = 4),
+                cordappsForAllNodes = listOf(contractCordapp, workflowCordapp)
+            )
+        )
+    }
+
+    @After
+    fun shutdown() {
+        mockNetwork.stopNodes()
+    }
+
+    @Test(timeout = 300_000)
+    fun `test serialization whitelist with mock network`() {
+        val node = mockNetwork.createPartyNode()
+        val ex = assertFailsWith<ExecutionException> {
+            node.startFlow(WhitelistFlow(badData)).get()
+        }
+        assertThat(ex)
+            .hasCauseExactlyInstanceOf(ContractRejection::class.java)
+            .hasMessageContaining("WhitelistData $badData exceeds maximum value!")
+    }
+}
\ No newline at end of file
diff --git a/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/InternalMockNetwork.kt b/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/InternalMockNetwork.kt
index 855db08b1f..5cac265b8b 100644
--- a/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/InternalMockNetwork.kt
+++ b/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/InternalMockNetwork.kt
@@ -62,6 +62,7 @@ import rx.Observable
 import rx.Scheduler
 import rx.internal.schedulers.CachedThreadScheduler
 import java.math.BigInteger
+import java.net.URLClassLoader
 import java.nio.file.Path
 import java.nio.file.Paths
 import java.security.PublicKey
@@ -148,6 +149,14 @@ open class InternalMockNetwork(cordappPackages: List<String> = emptyList(),
                                val defaultFactory: (MockNodeArgs) -> MockNode = { args -> MockNode(args) },
                                cordappsForAllNodes: Collection<TestCordappInternal> = emptySet(),
                                val autoVisibleNodes: Boolean = true) : AutoCloseable {
+    companion object {
+        fun createCordappClassLoader(cordapps: Collection<TestCordappInternal>?): URLClassLoader? {
+            if (cordapps == null || cordapps.isEmpty()) {
+                return null
+            }
+            return URLClassLoader(cordapps.map { it.jarFile.toUri().toURL() }.toTypedArray())
+        }
+    }
 
     var networkParameters: NetworkParameters = initialNetworkParameters
         private set
@@ -168,9 +177,12 @@ open class InternalMockNetwork(cordappPackages: List<String> = emptyList(),
     private val networkId = random63BitValue()
     private val networkParametersCopier: NetworkParametersCopier
     private val _nodes = mutableListOf<MockNode>()
-    private val serializationEnv = checkNotNull(setDriverSerialization()) { "Using more than one mock network simultaneously is not supported." }
     private val sharedUserCount = AtomicInteger(0)
     private val combinedCordappsForAllNodes = cordappsForPackages(cordappPackages) + cordappsForAllNodes
+    private val cordappClassLoader = createCordappClassLoader(combinedCordappsForAllNodes)
+    private val serializationEnv = checkNotNull(setDriverSerialization(cordappClassLoader)) {
+        "Using more than one mock network simultaneously is not supported."
+    }
 
     /** A read only view of the current set of nodes. */
     val nodes: List<MockNode> get() = _nodes
@@ -565,11 +577,13 @@ open class InternalMockNetwork(cordappPackages: List<String> = emptyList(),
     }
 
     fun stopNodes() {
-        // Serialization env must be unset even if other parts of this method fail.
-        serializationEnv.use {
-            nodes.forEach { it.started?.dispose() }
+        cordappClassLoader.use { _ ->
+            // Serialization env must be unset even if other parts of this method fail.
+            serializationEnv.use {
+                nodes.forEach { it.started?.dispose() }
+            }
+            messagingNetwork.stop()
         }
-        messagingNetwork.stop()
     }
 
     /** Block until all scheduled activity, active flows and network activity has ceased. */