如何使用Java 8运行Vertx
如何使用Java 8运行Vertx
提问于 2014-06-17 16:02:52
我已经下载并运行了Vertx，但是当我编辑其中一个开始使用Java 8特性(lambdas)的示例时，我一直收到编译器错误。在Intellij中，一切都编译得很好，IntelliJ指向我的Java8JDK，但是当我从命令行运行Vertx时，编译错误就会发生：
> vertx run FanoutServer.java
C:\Users\i50640\Documents\Intellij Projects\EchoServer\src\main\java\echoserver\FanoutServer.java:33: error: illegal start of expression
vertx.createNetServer().connectHandler(socket -> {
^
C:\Users\i50640\Documents\Intellij Projects\EchoServer\src\main\java\echoserver\FanoutServer.java:33: error: illegal start of expression
vertx.createNetServer().connectHandler(socket -> {
^
C:\Users\i50640\Documents\Intellij Projects\EchoServer\src\main\java\echoserver\FanoutServer.java:33: error: ';' expected
vertx.createNetServer().connectHandler(socket -> {
^
C:\Users\i50640\Documents\Intellij Projects\EchoServer\src\main\java\echoserver\FanoutServer.java:34: error: illegal start of expression
connections.add(socket.writeHandlerID());
Failed in deploying verticle
java.lang.RuntimeException: Compilation failed
at org.vertx.java.platform.impl.java.CompilingClassLoader.<init>(CompilingClassLoader.java:108)
at org.vertx.java.platform.impl.java.JavaVerticleFactory.createVerticle(JavaVerticleFactory.java:51)
at org.vertx.java.platform.impl.DefaultPlatformManager$21.run(DefaultPlatformManager.java:1723)
at org.vertx.java.core.impl.DefaultContext$3.run(DefaultContext.java:175)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:370)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.RuntimeException: Compilation failed!
at org.vertx.java.platform.impl.java.CompilingClassLoader.<init>(CompilingClassLoader.java:105)
... 7 more
Failed in deploying verticle
java.lang.RuntimeException: Compilation failed
at org.vertx.java.platform.impl.java.CompilingClassLoader.<init>(CompilingClassLoader.java:108)
at org.vertx.java.platform.impl.java.JavaVerticleFactory.createVerticle(JavaVerticleFactory.java:51)
at org.vertx.java.platform.impl.DefaultPlatformManager$21.run(DefaultPlatformManager.java:1723)
at org.vertx.java.core.impl.DefaultContext$3.run(DefaultContext.java:175)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:370)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.RuntimeException: Compilation failed!
at org.vertx.java.platform.impl.java.CompilingClassLoader.<init>(CompilingClassLoader.java:105)
... 7 more下面是FanoutServer.java文件：
public class FanoutServer extends Verticle {
public void start() {
final Set<String> connections = vertx.sharedData().getSet("conns");
vertx.createNetServer().connectHandler(socket -> {
connections.add(socket.writeHandlerID());
socket.dataHandler(buffer -> {
for (String actorID : connections) {
vertx.eventBus().publish(actorID, buffer);
}
});
socket.closeHandler(new VoidHandler() {
public void handle() {
connections.remove(socket.writeHandlerID());
}
});
}).listen(6748);
}
}在能够使用Java 8特性之前，我需要下载Vertx源代码并用Java 8编译吗？如果没有，我需要做些什么才能让它发挥作用？
回答 2
Stack Overflow用户
回答已采纳
发布于 2014-06-18 22:25:34
答案可以在找到：
https://groups.google.com/forum/#!topic/vertx/pG7mIo3-03o
简而言之，windows机器上的JAVA_HOME变量被指向JDK1.7而不是1.8。
Stack Overflow用户
发布于 2014-06-18 22:01:52
检查您的JAVA_HOME环境变量，确保它也指向正确的jdk。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/24268457
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