Deadlock occurs when skywalking starts

[luffy1849]

Found one Java-level deadlock:
=============================
"pool-5-thread-1":
  waiting to lock monitor 0x00007f93f800e288 (object 0x0000000733344d68, a sun.net.www.protocol.file.Handler),
  which is held by "main"
"main":
  waiting to lock monitor 0x00007f9434003ab8 (object 0x00000007333442d8, a sun.net.www.protocol.jar.JarFileFactory),
  which is held by "pool-5-thread-1"

Java stack information for the threads listed above:
===================================================
"pool-5-thread-1":
	at sun.net.www.protocol.file.Handler.openConnection(Handler.java:72)
	- waiting to lock <0x0000000733344d68> (a sun.net.www.protocol.file.Handler)
	at java.net.URL.openConnection(URL.java:979)
	at sun.net.www.protocol.jar.JarFileFactory.getConnection(JarFileFactory.java:65)
	at sun.net.www.protocol.jar.JarFileFactory.getPermission(JarFileFactory.java:154)
	at sun.net.www.protocol.jar.JarFileFactory.getCachedJarFile(JarFileFactory.java:126)
	at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:81)
	- locked <0x00000007333442d8> (a sun.net.www.protocol.jar.JarFileFactory)
	at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122)
	at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:150)
	at java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:238)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$ForClassLoader.locate(ClassFileLocator.java:453)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$ForClassLoader.locate(ClassFileLocator.java:434)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$Compound.locate(ClassFileLocator.java:1891)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default.doDescribe(TypePool.java:839)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution.access$001(TypePool.java:921)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution.doResolve(TypePool.java:1019)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution$LazyTypeDescription.delegate(TypePool.java:1088)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$AbstractBase$OfSimpleType$WithDelegation.getInterfaces(TypeDescription.java:8365)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$Generic$OfParameterizedType.getInterfaces(TypeDescription.java:4927)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$Generic$LazyProjection$WithEagerNavigation.getInterfaces(TypeDescription.java:6502)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.doMatch(HasSuperTypeMatcher.java:67)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.doMatch(HasSuperTypeMatcher.java:32)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$ForNonNullValues.matches(ElementMatcher.java:249)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Conjunction.matches(ElementMatcher.java:146)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:214)
	at org.apache.skywalking.apm.agent.core.plugin.match.ProtectiveShieldMatcher.matches(ProtectiveShieldMatcher.java:47)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$RawMatcher$ForElementMatchers.matches(AgentBuilder.java:1833)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:11880)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:11838)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1700(AgentBuilder.java:11555)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:12238)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:12178)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doPrivileged(AgentBuilder.java)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:11747)
	at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
	at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
	at java.util.concurrent.ConcurrentHashMap$EntryIterator.next(ConcurrentHashMap.java:3461)
	at java.util.concurrent.ConcurrentHashMap$EntryIterator.next(ConcurrentHashMap.java:3446)
	at com.dsfsd.api.vmmonitor.metrics.TimedLogTask.run(TimedLogTask.java:71)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
"main":
	at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:80)
	- waiting to lock <0x00000007333442d8> (a sun.net.www.protocol.jar.JarFileFactory)
	at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122)
	at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:150)
	at java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:238)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$ForClassLoader.locate(ClassFileLocator.java:453)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$ForClassLoader.locate(ClassFileLocator.java:434)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.dynamic.ClassFileLocator$Compound.locate(ClassFileLocator.java:1891)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default.doDescribe(TypePool.java:839)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution.access$001(TypePool.java:921)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution.doResolve(TypePool.java:1019)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution$LazyTypeDescription.delegate(TypePool.java:1088)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$AbstractBase$OfSimpleType$WithDelegation.getSuperClass(TypeDescription.java:8358)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType.getSuperClass(TypeDescription.java:3602)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDefinition$SuperClassIterator.next(TypeDefinition.java:391)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDefinition$SuperClassIterator.next(TypeDefinition.java:357)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.doMatch(HasSuperTypeMatcher.java:54)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.doMatch(HasSuperTypeMatcher.java:32)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$ForNonNullValues.matches(ElementMatcher.java:249)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Conjunction.matches(ElementMatcher.java:146)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:214)
	at org.apache.skywalking.apm.agent.core.plugin.match.ProtectiveShieldMatcher.matches(ProtectiveShieldMatcher.java:47)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$RawMatcher$ForElementMatchers.matches(AgentBuilder.java:1833)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:11880)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:11838)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1700(AgentBuilder.java:11555)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:12238)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:12178)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doPrivileged(AgentBuilder.java)
	at org.apache.skywalking.apm.dependencies.net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:11747)
	at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
	at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at java.net.URL.getURLStreamHandler(URL.java:1175)
	at java.net.URL.<init>(URL.java:420)
	at java.net.URL.<init>(URL.java:310)
	at java.net.URL.<init>(URL.java:333)
	at sun.net.www.protocol.file.Handler.openConnection(Handler.java:92)
	- locked <0x0000000733344d68> (a sun.net.www.protocol.file.Handler)
	at sun.net.www.protocol.file.Handler.openConnection(Handler.java:72)
	- locked <0x0000000733344d68> (a sun.net.www.protocol.file.Handler)
	at java.net.URL.openConnection(URL.java:979)
	at sun.net.www.protocol.jar.JarURLConnection.<init>(JarURLConnection.java:84)
	at sun.net.www.protocol.jar.Handler.openConnection(Handler.java:41)
	at java.net.URL.openConnection(URL.java:979)
	at org.apache.catalina.core.JreMemoryLeakPreventionListener.lifecycleEvent(JreMemoryLeakPreventionListener.java:413)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
	at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:388)
	- locked <0x00000007333a2908> (a org.apache.catalina.core.StandardServer)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:101)
	- locked <0x00000007333a2908> (a org.apache.catalina.core.StandardServer)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:581)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:604)
	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 org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)

Found 1 deadlock.

tomcat server.xml

<?xml version='1.0' encoding='utf-8'?>
<Server port="{CATALINA_SHUTDOWN_PORT}" shutdown="SHUTDOWN">
    <Listener className="org.apache.catalina.startup.VersionLoggerListener"/>
    <!-- Security listener. Documentation at /docs/config/listeners.html
    <Listener className="org.apache.catalina.security.SecurityListener" />
    -->
    <!--APR library loader. Documentation at /docs/apr.html -->
    <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on"/>
    <!-- Prevent memory leaks due to use of particular java/javax APIs-->
    <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
    <!--  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
      <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
    -->
    <!-- Global JNDI resources Documentation at /docs/jndi-resources-howto.html
    -->
    <GlobalNamingResources>
    </GlobalNamingResources>

    <!-- A "Service" is a collection of one or more "Connectors" that share
         a single "Container" Note:  A "Service" is not itself a "Container",
         so you may not define subcomponents such as "Valves" at this level.
         Documentation at /docs/config/service.html
     -->
    <Service name="Catalina">


        <!-- An Engine represents the entry point (within Catalina) that processes
             every request.  The Engine implementation for Tomcat stand alone
             analyzes the HTTP headers included with the request, and passes them
             on to the appropriate Host (virtual host).
             Documentation at /docs/config/engine.html -->

        <!-- You should set jvmRoute to support load-balancing via AJP ie :
        <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
        -->
        <Engine name="Catalina" defaultHost="localhost">
            <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true">
                <!-- Access log processes all example.
                     Documentation at: /docs/config/valve.html
                     Note: The pattern used is equivalent to using pattern="common" -->
                <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
                       prefix="localhost_access_log." suffix=".txt" fileDateFormat="yyyyMMdd-HH"
                       pattern="api.dsfsd.com %a %D - %t &quot;%r&quot; %s %b - - -" resolveHosts="false"/>

                <Valve className="com.dsfsd.api.vmmonitor.metrics.VMMonitorValve"/>

            </Host>
        </Engine>
    </Service>
</Server>

[luffy1849]

I solved this problem by excluding sun.net.www.protocol