https://bz.apache.org/bugzilla/show_bug.cgi?id=59649

--- Comment #4 from Mircea <zmircmir...@gmail.com> ---
Here is my stacktrace with Tomcat 8.5.4. Seems to be almost identical:

2016-08-24 07:48:38,236 INFO  [http-nio-8080-exec-10]
o.a.coyote.http11.Http11Processor DirectJDKLog.java:181 Error parsing HTTP
request header
 Note: further occurrences of HTTP header parsing errors will be logged at
DEBUG level.
java.lang.IllegalStateException: Unexpected state: headers already parsed.
Buffer not recycled?
    at
org.apache.coyote.http11.Http11InputBuffer.parseHeaders(Http11InputBuffer.java:587)
    at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1010)
    at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
    at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
2016-08-24 07:48:38,255 ERROR [http-nio-8080-exec-6]
o.a.c.c.C.[.[.[.[.w.w.a.b.p.ApiProjectList] DirectJDKLog.java:181
Servlet.service() for servlet
[dk.wordmaps.wordmaps4.api.boundary.project.ApiProjectList] in context with
path [/api] threw exception
java.lang.NullPointerException: null
    at
org.apache.catalina.connector.Request.getServletContext(Request.java:1618)
    at org.apache.catalina.connector.Request.getContextPath(Request.java:1975)
    at
org.apache.catalina.connector.RequestFacade.getContextPath(RequestFacade.java:784)
    at
dk.wordmaps.wordmaps4.api.boundary.util.security.StatelessSecurityFilter.doFilter(StatelessSecurityFilter.java:58)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at
dk.wordmaps.wordmaps4.api.boundary.util.UTF8ServletFilter.doFilter(UTF8ServletFilter.java:25)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
    at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:522)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at ch.qos.logback.access.tomcat.LogbackValve.invoke(LogbackValve.java:256)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
    at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1110)
    at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
    at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
2016-08-24 07:48:38,256 ERROR [http-nio-8080-exec-6]
o.a.c.c.C.[Catalina].[localhost] DirectJDKLog.java:181 Exception Processing
null
java.lang.NullPointerException: null
    at
org.apache.catalina.connector.Request.notifyAttributeAssigned(Request.java:1519)
    at org.apache.catalina.connector.Request.setAttribute(Request.java:1505)
    at
org.apache.catalina.core.StandardWrapperValve.exception(StandardWrapperValve.java:313)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:249)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
    at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:522)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at ch.qos.logback.access.tomcat.LogbackValve.invoke(LogbackValve.java:256)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
    at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1110)
    at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
    at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
2016-08-24 07:48:38,257 ERROR [http-nio-8080-exec-6]
o.a.coyote.http11.Http11Processor DirectJDKLog.java:181 Error processing
request
java.lang.NullPointerException: null
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:389)
    at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1110)
    at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
    at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
2016-08-24 07:48:38,257 ERROR [http-nio-8080-exec-6]
o.a.coyote.http11.Http11Processor DirectJDKLog.java:181 Error finishing
response
java.lang.NullPointerException: null
    at
org.apache.coyote.http11.Http11OutputBuffer.commit(Http11OutputBuffer.java:351)
    at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:658)
    at
org.apache.coyote.http11.Http11Processor.endRequest(Http11Processor.java:1786)
    at
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1149)
    at
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
    at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
    at
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

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