我有一个micronaut cli application。
某些命令是我要使用micronaut endpoints监视的长时间运行的过程
由于您使用的是cli应用程序，因此micronaut会检测并不会启动Web服务器。
在此长期运行的命令中，我添加了此命令以启动Web服务器：
applicationContext
.findBean(EmbeddedServer.class)
.ifPresent(server -> {
// start server
long start = System.currentTimeMillis();
server.start();
log.info(
"Startup completed in {} ms. Server Running: {}",
System.currentTimeMillis() - start,
server.getURL()
);
// force exit
if (server.isForceExit()) {
System.exit(0);
}
});
大多数代码来自Micronaut.java。
完整的命令源代码：
package test;
import io.micronaut.configuration.picocli.PicocliRunner;
import io.micronaut.context.ApplicationContext;
import io.micronaut.runtime.server.EmbeddedServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import picocli.CommandLine;
import javax.inject.Inject;
import java.util.concurrent.Callable;
@CommandLine.Command(
name = "test",
mixinStandardHelpOptions = true,
subcommands = {
TestApp.TestServer.class,
}
)
public class TestApp implements Callable<Object> {
public static void main(String[] args) throws Exception {
PicocliRunner.call(TestApp.class, args);
}
@Override
public Object call() throws Exception {
return PicocliRunner.call(TestApp.class, "--help");
}
@CommandLine.Command(
name = "server",
description = "Start a webserver"
)
public static class TestServer implements Runnable {
@Inject
ApplicationContext applicationContext;
Logger log = LoggerFactory.getLogger(TestServer.class);
@Override
public void run() {
applicationContext
.findBean(EmbeddedServer.class)
.ifPresent(server -> {
// start server
long start = System.currentTimeMillis();
server.start();
log.info(
"Startup completed in {} ms. Server Running: {}",
System.currentTimeMillis() - start,
server.getURL()
);
// force exit
if (server.isForceExit()) {
System.exit(0);
}
});
}
}
}
网络服务器运行良好。我添加了2个端点，记录器和运行状况。 记录器端点工作正常，但运行状况端点（与大多数端点一样）由于此stacktrace而失败： Full Stacktrace
io.reactivex.exceptions.UndeliverableException: The exception could not be delivered to the consumer because it has already canceled/disposed the flow or the exception has nowhere to go to begin with. Further reading: https://github.com/ReactiveX/RxJava/wiki/What's-different-in-2.0#error-handling | java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f5e667f[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@1615aa7e[Wrapped task = io.micronaut.http.context.ServerRequestContext$$Lambda$653/0x00000008406af040@5f7931cf]] rejected from java.util.concurrent.ThreadPoolExecutor@33dd1064[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
at io.reactivex.plugins.RxJavaPlugins.onError(RxJavaPlugins.java:367)
...
Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f5e667f[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@1615aa7e[Wrapped task = io.micronaut.http.context.ServerRequestContext$$Lambda$653/0x00000008406af040@5f7931cf]] rejected from java.util.concurrent.ThreadPoolExecutor@33dd1064[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2055)
....
at io.micronaut.scheduling.instrument.InstrumentedExecutorService.submit(InstrumentedExecutorService.java:89)
at io.micronaut.core.async.publisher.AsyncSingleResultPublisher$ExecutorServiceSubscription.request(AsyncSingleResultPublisher.java:98)
at io.reactivex.internal.operators.flowable.FlowableFlatMap$InnerSubscriber.onSubscribe(FlowableFlatMap.java:656)
at io.micronaut.core.async.publisher.AsyncSingleResultPublisher.subscribe(AsyncSingleResultPublisher.java:59)
...
at io.reactivex.Flowable.subscribe(Flowable.java:14805)
... 38 more
Exception in thread "nioEventLoopGroup-1-4" io.reactivex.exceptions.UndeliverableException: The exception could not be delivered to the consumer because it has already canceled/disposed the flow or the exception has nowhere to go to begin with. Further reading: https://github.com/ReactiveX/RxJava/wiki/What's-different-in-2.0#error-handling | java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f5e667f[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@1615aa7e[Wrapped task = io.micronaut.http.context.ServerRequestContext$$Lambda$653/0x00000008406af040@5f7931cf]] rejected from java.util.concurrent.ThreadPoolExecutor@33dd1064[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
...
at io.micronaut.http.context.ServerRequestTracingPublisher.lambda$subscribe$0(ServerRequestTracingPublisher.java:52)
at io.micronaut.http.context.ServerRequestContext.with(ServerRequestContext.java:52)
at io.micronaut.http.context.ServerRequestTracingPublisher.subscribe(ServerRequestTracingPublisher.java:52)
at io.micronaut.core.async.publisher.Publishers.lambda$map$2(Publishers.java:133)
...
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f5e667f[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@1615aa7e[Wrapped task = io.micronaut.http.context.ServerRequestContext$$Lambda$653/0x00000008406af040@5f7931cf]] rejected from java.util.concurrent.ThreadPoolExecutor@33dd1064[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
... 38 more
2019-10-11 17:18:50,689 WARN nioEventLoopGroup-1-4 i.n.u.c.AbstractEventExecutor A task raised an exception. Task: io.reactivex.internal.schedulers.ExecutorScheduler$ExecutorWorker@7ebe5c10
java.lang.NullPointerException: Actually not, but can't throw other exceptions due to RS
at io.reactivex.Flowable.subscribe(Flowable.java:14814)
...
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@1f5e667f[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@1615aa7e[Wrapped task = io.micronaut.http.context.ServerRequestContext$$Lambda$653/0x00000008406af040@5f7931cf]] rejected from java.util.concurrent.ThreadPoolExecutor@33dd1064[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2055)
at java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:825)
at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1355)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
at io.micronaut.scheduling.instrument.InstrumentedExecutorService.submit(InstrumentedExecutorService.java:89)
at io.micronaut.core.async.publisher.AsyncSingleResultPublisher$ExecutorServiceSubscription.request(AsyncSingleResultPublisher.java:98)
at io.reactivex.internal.operators.flowable.FlowableFlatMap$InnerSubscriber.onSubscribe(FlowableFlatMap.java:656)
at io.micronaut.core.async.publisher.AsyncSingleResultPublisher.subscribe(AsyncSingleResultPublisher.java:59)
at io.reactivex.internal.operators.flowable.FlowableFlatMap$MergeSubscriber.onNext(FlowableFlatMap.java:163)
at io.reactivex.internal.operators.flowable.FlowableFromIterable$IteratorSubscription.slowPath(FlowableFromIterable.java:236)
at io.reactivex.internal.operators.flowable.FlowableFromIterable$BaseRangeSubscription.request(FlowableFromIterable.java:124)
at io.reactivex.internal.operators.flowable.FlowableFlatMap$MergeSubscriber.onSubscribe(FlowableFlatMap.java:117)
at io.reactivex.internal.operators.flowable.FlowableFromIterable.subscribe(FlowableFromIterable.java:69)
at io.reactivex.internal.operators.flowable.FlowableFromIterable.subscribeActual(FlowableFromIterable.java:47)
at io.reactivex.Flowable.subscribe(Flowable.java:14805)
... 38 common frames omitted
有任何线索做到这一点吗？
答案 0 :(得分：0)
感谢Graeme Rocher在这里提供了正确的指导：https://github.com/micronaut-projects/micronaut-picocli/issues/9。
从cli启动Web服务器是正确的方法：
sign.initVerify(certificate.getPublicKey());
但是您需要注意，您的Command必须将整个逻辑保留在主线程上。 在多线程应用程序的情况下，如果您不等待主命令中的所有线程，服务器将关闭。