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From John Smith <java.dev....@gmail.com>
Subject Re: Getting java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError when stopping/canceling job.
Date Thu, 16 May 2019 20:06:56 GMT
Thanks! This should do the trick...

@Override
public void close() throws Exception {
   CompletableFuture<Void> vertxClosed = new CompletableFuture<>();

   if(jdbc != null)
      jdbc.close();

   if(vertx != null)
      vertx.close(close -> {
         if(close.failed())
            logger.error("Vertx did not close properly!", close.cause());

         vertxClosed.complete(null);
      });

   if(ignite != null)
      ignite.close();

   // Give a chance to the async libs to close().
   vertxClosed.get(3000, TimeUnit.MILLISECONDS);
}


On Thu, 16 May 2019 at 15:25, Ken Krugler <kkrugler_lists@transpac.com>
wrote:

>
> On May 16, 2019, at 9:38 AM, John Smith <java.dev.mtl@gmail.com> wrote:
>
> Hi, so Thread.Sleep(1000) seems to do the trick. Now is this a good thing
> or bad thing?
>
>
> An arbitrary sleep duration has the potential to create random failures if
> the close takes longer than expected.
>
> For async close() calls, often you handle this by querying (in a loop,
> with sleep() and a max duration) the client until its status changes.
>
> — Ken
>
>
>
> On Thu, 16 May 2019 at 11:46, John Smith <java.dev.mtl@gmail.com> wrote:
>
>> Yes when I mean cancel the JOB, it's when you go inside the UI and hit
>> the cancel button at the top right corner.
>>
>> The close is very simple...
>>
>> @Override
>> public void close() throws Exception {
>>    if(jdbc != null)
>>       jdbc.close();
>>
>>    if(vertx != null)
>>       vertx.close();
>>
>>    if(ignite != null)
>>       ignite.close();
>> }
>>
>> I was thinking that jdbc.close() and vertx.close() are actually async
>> underneath. The vertx APIs offers 2 methods for close, one which has async
>> interface and one that does not. But essentially they are both async.
>>
>> So I'm thinking maybe I can introduce a small Thread.Sleep(1000) after
>> the last close to give a chance for vertx.close().
>>
>>
>>
>>
>> On Thu, 16 May 2019 at 04:14, Andrey Zagrebin <andrey@ververica.com>
>> wrote:
>>
>>> Could you share the source code of your RichAsyncFunction?
>>> Looks like netty threads of vertx are still being shutdown after user
>>> code class loader has been shutdown.
>>> It probably means that RichAsyncFunction was not closed properly or not
>>> all resources have been fully freed there (logging your
>>> RichAsyncFunction.close could help).
>>> Do you mean cancelation by stopping the job?
>>>
>>> On Wed, May 15, 2019 at 10:02 PM John Smith <java.dev.mtl@gmail.com>
>>> wrote:
>>>
>>>> So these are the two exceptions I see in the logs...
>>>>
>>>> Exception in thread "vert.x-worker-thread-0" Exception in thread
>>>> "vert.x-internal-blocking-0" java.lang.NoClassDefFoundError:
>>>> io/netty/util/concurrent/FastThreadLocal
>>>> at
>>>> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:32)
>>>> at java.lang.Thread.run(Thread.java:748)
>>>> Caused by: java.lang.ClassNotFoundException:
>>>> io.netty.util.concurrent.FastThreadLocal
>>>> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
>>>> at
>>>> org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:129)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
>>>> ... 2 more
>>>> java.lang.NoClassDefFoundError: io/netty/util/concurrent/FastThreadLocal
>>>> at
>>>> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:32)
>>>> at java.lang.Thread.run(Thread.java:748)
>>>> May 15, 2019 10:42:07 AM io.vertx.core.impl.ContextImpl
>>>> SEVERE: Unhandled exception
>>>> java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError:
>>>> io/vertx/core/impl/VertxImpl$SharedWorkerPool
>>>> at
>>>> io.vertx.core.impl.VertxImpl.lambda$deleteCacheDirAndShutdown$25(VertxImpl.java:830)
>>>> at io.vertx.core.impl.ContextImpl.lambda$null$0(ContextImpl.java:284)
>>>> at io.vertx.core.impl.ContextImpl.executeTask(ContextImpl.java:320)
>>>> at
>>>> io.vertx.core.impl.EventLoopContext.lambda$executeAsync$0(EventLoopContext.java:38)
>>>> at
>>>> io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
>>>> at
>>>> io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
>>>> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462)
>>>> at
>>>> io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
>>>> at
>>>> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>>>> at java.lang.Thread.run(Thread.java:748)
>>>> Caused by: java.lang.NoClassDefFoundError:
>>>> io/vertx/core/impl/VertxImpl$SharedWorkerPool
>>>> ... 10 more
>>>> Caused by: java.lang.ClassNotFoundException:
>>>> io.vertx.core.impl.VertxImpl$SharedWorkerPool
>>>> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
>>>> at
>>>> org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:129)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
>>>> ... 10 more
>>>>
>>>> On Wed, 15 May 2019 at 12:00, Andrey Zagrebin <andrey@ververica.com>
>>>> wrote:
>>>>
>>>>> Hi John,
>>>>>
>>>>> could you share the full stack trace or better logs?
>>>>> It looks like something is trying to be executed in vertx.io code
>>>>> after the local task has been stopped and the class loader for the user
>>>>> code has been unloaded. Maybe from some daemon thread pool.
>>>>>
>>>>> Best,
>>>>> Andrey
>>>>>
>>>>>
>>>>> On Wed, May 15, 2019 at 4:58 PM John Smith <java.dev.mtl@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I'm using vertx.io as an async JDBC client for a RichAsyncFunction
>>>>>> it works fine but when I stop the job I get...
>>>>>>
>>>>>> java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError:
>>>>>> io/vertx/core/impl/VertxImpl$SharedWorkerPool
>>>>>>
>>>>>> Is there a way to avoid/fix this?
>>>>>>
>>>>>
> --------------------------
> Ken Krugler
> +1 530-210-6378
> http://www.scaleunlimited.com
> Custom big data solutions & training
> Flink, Solr, Hadoop, Cascading & Cassandra
>
>

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