Build on JDK11

* Up the Robolectric version to support JDK11.
  According to robolectric/robolectric#4085, by 4.0.2
it should support JDK11.
  Tests do pass after setting the version to 4.0.2, but they fail for every version released after that up to 4.3.1.
  It is unclear what causes this. I commit this to check how it works on the build agents, as some comments in the issue imply that on MacOS thes version, too, does not work with JDK11.
* Fix fully qualified names in stacktraces in tests:
  - With move to JDK11, the `park` method changed its fully qualified name.
* Add new sanitazing to verification of stacktraces:
  - Now stacktraces have additional substrings, separated by a slash:
    java-base/java.util.lang
  - They are stripped away.
  - Also, the placement of tabs has changed, and so the tabs are also completely removed.
* Refactor `verifyStackTrace`
  - It used to wrap the only loop where something happened in two other loops that did nothing. Now, only the innermost loop is left.
* Use a separate JavaFx dependency.
* Add javafx dependency to the Swing integration
* Improve error handling for JavaFX initialization
  - Now, the JavaFX initialization may fail with an exception in case something went wrong.
  - The driver for this change was that the initialization started hanging in headless environments with transition to JDK 11.
  - Before, the initialization logic had a flaw. If a call to one API
failed, another API would be attempted. However, this approach is
problematic: if the first call failed with an exception for some
reason, it would leave JavaFX in a broken state where a flag would
imply that the system is being initialized. Subsequent calls would
then proceed to wait forever for the initialization to complete.
  - Now, exceptions are checked more carefully, ensuring that we only
fall back to the internal API in case the public one is unavailable
and not failed for some valid reason. This differentiation also
allows to more boldly rethrow exceptions upwards, being more or
less confident that these are relevant to the user.
* Additionally test JavaFX integration with JDK8

Co-authored-by: Dmitry Khalanskiy <[email protected]>
Co-authored-by: Roman Elizarov <[email protected]>

Author: 3 people

README.md

@@ -203,8 +203,9 @@ to Gradle (in Preferences -> Build, Execution, Deployment -> Build Tools -> Grad
 
 ### Requirements
 
-* JDK >= 1.8 referred to by the `JAVA_HOME` environment variable. JDK must include JavaFX.
+* JDK >= 11 referred to by the `JAVA_HOME` environment variable.
 * JDK 1.6 referred to by the `JDK_16` environment variable. It is okay to have `JDK_16` pointing to `JAVA_HOME` for external contributions.
+* JDK 1.8 referred to by the `JDK_18` environment variable. Only used by nightly stress-tests. It is okay to have `JDK_16` pointing to `JAVA_HOME` for external contributions.
 
 ## Contributions and releases
 

gradle.properties

@@ -17,6 +17,7 @@ byte_buddy_version=1.9.3
 reactor_vesion=3.2.5.RELEASE
 reactive_streams_version=1.0.2
 rxjava2_version=2.2.8
+javafx_version=11.0.2
 binary_compatibility_validator_version=0.1.1
 
 # JS

kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt

@@ -20,7 +20,7 @@ class RunningThreadStackMergeTest : DebugTestBase() {
         verifyDump(
             "Coroutine \"coroutine#1\":BlockingCoroutine{Active}@62230679", // <- this one is ignored
             "Coroutine \"coroutine#2\":StandaloneCoroutine{Active}@50284dc4, state: RUNNING\n" +
-                    "\tat sun.misc.Unsafe.park(Native Method)\n" +
+                    "\tat jdk.internal.misc.Unsafe.park(Native Method)\n" +
                     "\tat java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)\n" +
                     "\tat java.util.concurrent.locks.AbstractQueuedSynchronizer\$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)\n" +
                     "\tat java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:234)\n" +
@@ -75,7 +75,7 @@ class RunningThreadStackMergeTest : DebugTestBase() {
         verifyDump(
             "Coroutine \"coroutine#1\":BlockingCoroutine{Active}@62230679", // <- this one is ignored
             "Coroutine \"coroutine#2\":StandaloneCoroutine{Active}@3aea3c67, state: RUNNING\n" +
-                    "\tat sun.misc.Unsafe.park(Native Method)\n" +
+                    "\tat jdk.internal.misc.Unsafe.park(Native Method)\n" +
                     "\tat java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)\n" +
                     "\tat java.util.concurrent.locks.AbstractQueuedSynchronizer\$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)\n" +
                     "\tat java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:234)\n" +
@@ -116,7 +116,7 @@ class RunningThreadStackMergeTest : DebugTestBase() {
         verifyDump(
             "Coroutine \"coroutine#1\":BlockingCoroutine{Active}@62230679", // <- this one is ignored
             "Coroutine \"coroutine#2\":StandaloneCoroutine{Active}@3aea3c67, state: RUNNING\n" +
-                    "\tat sun.misc.Unsafe.park(Native Method)\n" +
+                    "\tat jdk.internal.misc.Unsafe.park(Native Method)\n" +
                     "\tat java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)\n" +
                     "\tat java.util.concurrent.locks.AbstractQueuedSynchronizer\$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)\n" +
                     "\tat java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:234)\n" +

kotlinx-coroutines-debug/test/StracktraceUtils.kt

@@ -11,6 +11,8 @@ public fun String.trimStackTrace(): String =
     trimIndent()
         .replace(Regex(":[0-9]+"), "")
         .replace(Regex("#[0-9]+"), "")
+        .replace(Regex("(?<=\tat )[^\n]*/"), "")
+        .replace(Regex("\t"), "")
         .applyBackspace()
 
 public fun String.applyBackspace(): String {
@@ -30,16 +32,12 @@ public fun String.applyBackspace(): String {
 
 public fun verifyStackTrace(e: Throwable, traces: List<String>) {
     val stacktrace = toStackTrace(e)
+    val trimmedStackTrace = stacktrace.trimStackTrace()
     traces.forEach {
-        val expectedLines = it.trimStackTrace().split("\n")
-        for (i in 0 until expectedLines.size) {
-            traces.forEach {
-                assertTrue(
-                    stacktrace.trimStackTrace().contains(it.trimStackTrace()),
-                    "\nExpected trace element:\n$it\n\nActual stacktrace:\n$stacktrace"
-                )
-            }
-        }
+        assertTrue(
+            trimmedStackTrace.contains(it.trimStackTrace()),
+            "\nExpected trace element:\n$it\n\nActual stacktrace:\n$stacktrace"
+        )
     }
 
     val causes = stacktrace.count("Caused by")

ui/kotlinx-coroutines-android/android-unit-tests/build.gradle

@@ -10,7 +10,7 @@ dependencies {
     testImplementation 'com.google.android:android:4.1.1.4'
     testImplementation 'com.android.support:support-annotations:26.1.0'
     testImplementation 'com.google.android:android:4.1.1.4'
-    testImplementation 'org.robolectric:robolectric:4.0-alpha-3'
+    testImplementation 'org.robolectric:robolectric:4.0.2'
     testImplementation project(":kotlinx-coroutines-test")
     testImplementation project(":kotlinx-coroutines-android")
 }

ui/kotlinx-coroutines-android/build.gradle

@@ -22,7 +22,7 @@ dependencies {
     compileOnly 'com.android.support:support-annotations:26.1.0'
 
     testImplementation 'com.google.android:android:4.1.1.4'
-    testImplementation 'org.robolectric:robolectric:4.0-alpha-3'
+    testImplementation 'org.robolectric:robolectric:4.0.2'
     testImplementation 'org.smali:baksmali:2.2.7'
 
     // TODO Replace with a 1.6.x version once released to maven.google.com.
@@ -105,4 +105,4 @@ tasks.withType(dokka.getClass()) {
         url = new URL("https://developer.android.com/reference/")
         packageListUrl = projectDir.toPath().resolve("package.list").toUri().toURL()
     }
-}
+}

ui/kotlinx-coroutines-javafx/build.gradle

@@ -1,4 +1,34 @@
 /*
- * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 
+plugins {
+    id 'org.openjfx.javafxplugin' version '0.0.8'
+}
+
+javafx {
+    version = javafx_version
+    modules = [ 'javafx.controls' ]
+    configuration = 'compile'
+}
+
+task checkJdk8() {
+    // only fail w/o JDK_18 when actually trying to test, not during project setup phase
+    doLast {
+        if (!System.env.JDK_18) {
+            throw new GradleException("JDK_18 environment variable is not defined. " +
+                    "Can't run JDK 8 compatibility tests. " +
+                    "Please ensure JDK 8 is installed and that JDK_18 points to it.")
+        }
+    }
+}
+
+task jdk8Test(type: Test, dependsOn: [compileTestKotlin, checkJdk8]) {
+    classpath = files { test.classpath }
+    testClassesDirs = files { test.testClassesDirs }
+    executable = "$System.env.JDK_18/bin/java"
+}
+
+// Run these tests only during nightly stress test
+jdk8Test.onlyIf { project.properties['stressTest'] != null }
+build.dependsOn jdk8Test

ui/kotlinx-coroutines-javafx/src/JavaFxDispatcher.kt

@@ -11,6 +11,7 @@ import javafx.util.*
 import kotlinx.coroutines.*
 import kotlinx.coroutines.internal.*
 import kotlinx.coroutines.javafx.JavaFx.delay
+import java.lang.UnsupportedOperationException
 import java.lang.reflect.*
 import java.util.concurrent.*
 import kotlin.coroutines.*
@@ -115,41 +116,42 @@ private class PulseTimer : AnimationTimer() {
     }
 }
 
+/** @return [true] if initialized successfully, and [false] if no display is detected */
 internal fun initPlatform(): Boolean = PlatformInitializer.success
 
 // Lazily try to initialize JavaFx platform just once
 private object PlatformInitializer {
     val success = run {
         /*
          * Try to instantiate JavaFx platform in a way which works
-         * both on Java 8 and Java 11 and does not produce "illegal reflective access":
-         *
-         * 1) Try to invoke javafx.application.Platform.startup if this class is
-         *    present in a classpath.
-         * 2) If it is not successful and does not because it is already started,
-         *    fallback to PlatformImpl.
-         *
-         * Ignore exception anyway in case of unexpected changes in API, in that case
-         * user will have to instantiate it manually.
+         * both on Java 8 and Java 11 and does not produce "illegal reflective access".
          */
-        val runnable = Runnable {}
-        runCatching {
-            // Invoke public API if it is present
-            Class.forName("javafx.application.Platform")
-                .getMethod("startup", java.lang.Runnable::class.java)
-                .invoke(null, runnable)
-        }.recoverCatching { exception ->
-            // Recover -> check re-initialization
-            val cause = exception.cause
-            if (exception is InvocationTargetException && cause is IllegalStateException
-                && "Toolkit already initialized" == cause.message) {
-                // Toolkit is already initialized -> success, return
-                Unit
-            } else { // Fallback to Java 8 API
-                Class.forName("com.sun.javafx.application.PlatformImpl")
+        try {
+            val runnable = Runnable {}
+            // Invoke the public API if it is present.
+            runCatching {
+                Class.forName("javafx.application.Platform")
+                        .getMethod("startup", java.lang.Runnable::class.java)
+            }.map { method ->
+                method.invoke(null, runnable)
+                return@run true
+            }
+            // If we are here, it means the public API is not present. Try the private API.
+            Class.forName("com.sun.javafx.application.PlatformImpl")
                     .getMethod("startup", java.lang.Runnable::class.java)
                     .invoke(null, runnable)
+            true
+        } catch (exception: InvocationTargetException) {
+            // Can only happen as a result of [Method.invoke].
+            val cause = exception.cause!!
+            when {
+                // Maybe the problem is that JavaFX is already initialized? Everything is good then.
+                cause is IllegalStateException && "Toolkit already initialized" == cause.message -> true
+                // If the problem is the headless environment, it is okay.
+                cause is UnsupportedOperationException && "Unable to open DISPLAY" == cause.message -> false
+                // Otherwise, the exception demonstrates an anomaly.
+                else -> throw cause
             }
-        }.isSuccess
+        }
     }
 }

ui/kotlinx-coroutines-swing/build.gradle

@@ -2,6 +2,16 @@
  * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 
+plugins {
+    id 'org.openjfx.javafxplugin' version '0.0.8'
+}
+
+javafx {
+    version = javafx_version
+    modules = [ 'javafx.controls' ]
+    configuration = 'compile'
+}
+
 dependencies {
     testCompile project(':kotlinx-coroutines-jdk8')
-}
+}