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web-function-sample's Introduction

Spring 5 Functional Web Framework Sample

This repository contains a sample application that uses the functional web framework introduced in Spring 5. It consists of the following types:

Class	Description
`Person`	POJO representing a person
`PersonRepository`	Reactive repository for `Person`
`DummyPersonRepository`	Dummy implementation of `PersonRepository`
`PersonHandler`	Web handler that exposes a `PersonRepository`
`Server`	Contains a `main` method to start the server
`Client`	Contains a `main` method to start the client

Running the Reactor Netty server

Build using maven
Run the org.springframework.samples.web.reactive.function.Server class

Running the Tomcat server

Comment out the startReactorServer() line in Server.java
Uncomment the startTomcatServer() line in Server.java
Build using maven
Run the org.springframework.samples.web.reactive.function.Server class

Running the Client

Build using maven
Run the org.springframework.samples.web.reactive.function.Client class

Sample curl commands

Instead of running the client, here are some sample curl commands that access resources exposed by this sample:

curl -v 'http://localhost:8080/person'
curl -v 'http://localhost:8080/person/1'
curl -d '{"name":"Jack Doe","age":"16"}' -H 'Content-Type: application/json' -v 'http://localhost:8080/person'

License

This sample released under version 2.0 of the Apache License.

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web-function-sample's Issues

How to do a redirect using the reactive framework?

I'm playing with Instagram REST API and since they use OAuth, I need to redirect to their authorization URL. In regular Spring, that can be done by returning "redirect:" + authorizationUrl. Doing the following throws exception. See SPR-15078.

@GetMapping("/")
Mono<ServerResponse> redirect() {
        return ServerResponse.status(TEMPORARY_REDIRECT)
                .location(URI.create(authorizationUrl))
                .build();
}

How to make spring inject spring beans: @Component s, @Service s, etc.

Until now, I've not found a single example using let's say, a JPA repository (from spring data JPA). It seems counterproductive to instantiate everything Spring gives us when using Spring Boot for example.

How does this work with Boot?

How do I get all the goodies of Spring Boot while using the reactive functions?

ClassNotFoundException: reactor.core.Disposable

I got this exception when starting the client and reactive server. Tomcat server starts normally.

Exception in thread "main" java.lang.NoClassDefFoundError: reactor/core/Disposable
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at org.springframework.http.client.reactive.ReactorClientHttpConnector.<init>(ReactorClientHttpConnector.java:48)
	at org.springframework.samples.web.reactive.function.Client.<init>(Client.java:35)
	at org.springframework.samples.web.reactive.function.Client.main(Client.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: reactor.core.Disposable
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 20 more

Every other request gets stuck in ReactorServer

While everything works fine when starting the Driver with startTomcatServer(), startReactorServer() is funny in that only odd requests work. Every other request is stuck forever.

Thread dump when stuck:

/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/bin/java -Didea.launcher.port=7537 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA CE.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_102.jdk/Contents/Home/lib/tools.jar:/Users/peterperhac/personal/reactive-tinkering/web-function-sample/target/classes:/Users/peterperhac/.m2/repository/org/reactivestreams/reactive-streams/1.0.0/reactive-streams-1.0.0.jar:/Users/peterperhac/.m2/repository/io/projectreactor/reactor-core/3.0.2.RELEASE/reactor-core-3.0.2.RELEASE.jar:/Users/peterperhac/.m2/repository/io/projectreactor/ipc/reactor-netty/0.5.1.RELEASE/reactor-netty-0.5.1.RELEASE.jar:/Users/peterperhac/.m2/repository/io/netty/netty-all/4.1.3.Final/netty-all-4.1.3.Final.jar:/Users/peterperhac/.m2/repository/io/projectreactor/ipc/reactor-ipc/0.5.1.RELEASE/reactor-ipc-0.5.1.RELEASE.jar:/Users/peterperhac/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.5.4/tomcat-embed-core-8.5.4.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-web-reactive/5.0.0.M2/spring-web-reactive-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-core/5.0.0.M2/spring-core-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/commons-logging/commons-logging/1.2/commons-logging-1.2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-web/5.0.0.M2/spring-web-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-aop/5.0.0.M2/spring-aop-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-beans/5.0.0.M2/spring-beans-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-context/5.0.0.M2/spring-context-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/org/springframework/spring-expression/5.0.0.M2/spring-expression-5.0.0.M2.jar:/Users/peterperhac/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.8.2/jackson-databind-2.8.2.jar:/Users/peterperhac/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.8.0/jackson-annotations-2.8.0.jar:/Users/peterperhac/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.8.2/jackson-core-2.8.2.jar:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain org.springframework.samples.web.reactive.function.Driver
Press ENTER to exit.
Sep 23, 2016 11:02:52 PM reactor.util.Loggers$JdkLogger info
INFO: BIND OK /127.0.0.1:8080
2016-09-23 23:03:07
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.102-b14 mixed mode):

"threadDeathWatcher-2-1" #14 daemon prio=1 os_prio=31 tid=0x00007fcdad819800 nid=0x1407 waiting on condition [0x00007000018de000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at io.netty.util.ThreadDeathWatcher$Watcher.run(ThreadDeathWatcher.java:150)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
at java.lang.Thread.run(Thread.java:745)

"reactor-tcp-server-io-2" #13 prio=5 os_prio=31 tid=0x00007fcdad813000 nid=0x3d07 runnable [0x00007000017db000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:117)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x000000076ca3bb40> (a io.netty.channel.nio.SelectedSelectionKeySet)
- locked <0x000000076ca3ba78> (a java.util.Collections$UnmodifiableSet)
- locked <0x000000076ca3b958> (a sun.nio.ch.KQueueSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:692)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:352)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:877)
at java.lang.Thread.run(Thread.java:745)

"reactor-tcp-server-select-1" #12 prio=5 os_prio=31 tid=0x00007fcdad988000 nid=0x5c0f runnable [0x00007000016d8000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:117)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x000000076ca17940> (a io.netty.channel.nio.SelectedSelectionKeySet)
- locked <0x000000076ca10f28> (a java.util.Collections$UnmodifiableSet)
- locked <0x000000076ca0f510> (a sun.nio.ch.KQueueSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:692)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:352)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:877)
at java.lang.Thread.run(Thread.java:745)

"Monitor Ctrl-Break" #10 daemon prio=5 os_prio=31 tid=0x00007fcdad07f000 nid=0x5603 runnable [0x00007000015d5000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
- locked <0x000000076ad96b08> (a java.io.InputStreamReader)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
- locked <0x000000076ad96b08> (a java.io.InputStreamReader)
at java.io.BufferedReader.readLine(BufferedReader.java:389)
at com.intellij.rt.execution.application.AppMain$1.run(AppMain.java:84)
at java.lang.Thread.run(Thread.java:745)

"Service Thread" #9 daemon prio=9 os_prio=31 tid=0x00007fcdab00d800 nid=0x5203 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C1 CompilerThread3" #8 daemon prio=9 os_prio=31 tid=0x00007fcdaa815800 nid=0x5003 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C2 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007fcdad044800 nid=0x4e03 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007fcdad044000 nid=0x4c03 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007fcdad029000 nid=0x4a03 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007fcdae004000 nid=0x3e0f waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fcdab802000 nid=0x3803 in Object.wait() [0x0000700000d3a000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076ab08e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x000000076ab08e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007fcdad022800 nid=0x3603 in Object.wait() [0x0000700000c37000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076ab06b40> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x000000076ab06b40> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"main" #1 prio=5 os_prio=31 tid=0x00007fcdae801800 nid=0x1703 runnable [0x0000700000218000]
java.lang.Thread.State: RUNNABLE
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:255)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
- locked <0x000000076ab1f9f8> (a java.io.BufferedInputStream)
at org.springframework.samples.web.reactive.function.Driver.main(Driver.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

"VM Thread" os_prio=31 tid=0x00007fcdac802800 nid=0x3403 runnable

"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fcdaa80e000 nid=0x2403 runnable

"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fcdab000000 nid=0x2603 runnable

"GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007fcdab001000 nid=0x2803 runnable

"GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007fcdab002000 nid=0x2a03 runnable

"GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007fcdab002800 nid=0x2c03 runnable

"GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007fcdac800800 nid=0x2e03 runnable

"GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007fcdac801000 nid=0x3003 runnable

"GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007fcdac802000 nid=0x3203 runnable

"VM Periodic Task Thread" os_prio=31 tid=0x00007fcdac806800 nid=0x5403 waiting on condition

JNI global references: 506

Heap
PSYoungGen total 76288K, used 57729K [0x000000076ab00000, 0x0000000770000000, 0x00000007c0000000)
eden space 65536K, 88% used [0x000000076ab00000,0x000000076e3606a0,0x000000076eb00000)
from space 10752K, 0% used [0x000000076f580000,0x000000076f580000,0x0000000770000000)
to space 10752K, 0% used [0x000000076eb00000,0x000000076eb00000,0x000000076f580000)
ParOldGen total 175104K, used 0K [0x00000006c0000000, 0x00000006cab00000, 0x000000076ab00000)
object space 175104K, 0% used [0x00000006c0000000,0x00000006c0000000,0x00000006cab00000)
Metaspace used 15452K, capacity 15770K, committed 15872K, reserved 1062912K
class space used 1879K, capacity 1963K, committed 2048K, reserved 1048576K

Compilation error on a fresh clone

Hi!

Sorry for the maybe lame question, but I saw this example and tried to execute in my machine and on a fresh clone, when I do a simple mvn package I see the following error:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project web-function-sample: Compilation failure
[ERROR] C:\dev\workspace\web-function-sample\src\main\java\org\springframework\samples\web\reactive\function\Server.java:[98,23] error: incompatible types: ReactorHttpHandlerAdapter cannot be converted to Function<? super HttpChannel,? extends Publisher>

Basically the error is in this line of Sever.java:

server.startAndAwait(adapter);

As the project uses a fixed version of the reactor-netty library, I suppose something changed in the spring-web lib, as the project is set up to use the latest version.

Meanwhile I will try to figure out what changed, I just wanted to let you know.

Regards.

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