WebSocket through Apache and Tomcat 500 Error : java.lang.UnsupportedOperationException: HTTP upgrade is not supported by this protocol

I was implementing Web Socket using JavaScript on the client and Java/Tomcat on the server. It works very fine on localhost but when I deploy on my remote host it fails. Checking the console, I get 500 error on the Web socket request. Hence i check the server error log to view the error and find -

java.lang.UnsupportedOperationException: HTTP upgrade is not supported by this protocol
    at org.apache.coyote.AbstractProcessor.doHttpUpgrade(AbstractProcessor.java:712) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProcessor.action(AbstractProcessor.java:478) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.Request.action(Request.java:433) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.catalina.connector.Request.upgrade(Request.java:2022) ~[catalina.jar:8.5.20]
    at org.apache.catalina.connector.RequestFacade.upgrade(RequestFacade.java:1115) ~[catalina.jar:8.5.20]
    at org.apache.tomcat.websocket.server.UpgradeUtil.doUpgrade(UpgradeUtil.java:234) ~[tomcat-websocket-8.5.20.jar:8.5.20]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:77) ~[tomcat-websocket-8.5.20.jar:8.5.20]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:8.5.20]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [catalina.jar:8.5.20]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [catalina.jar:8.5.20]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [catalina.jar:8.5.20]
    at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:486) [tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-coyote.jar:8.5.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457) [tomcat-coyote.jar:8.5.20]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:8.5.20]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_11]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_11]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.5.20]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_11]

I did some research and stumbled on someone who had a similar problem and asked in this question WebSockets through Apache and Tomcat: HTTP upgrade is not supported by the AJP protocol but am running a private tomcat instance on a shared hosting server so the solutions provided in that answer cannot be achieved by me hence i contact my host and they respond with

'While investigating your query, we could see that making changes in the tomcat and HTTP settings as per the steps mentioned in your email will affect the AJP connection configuration of another shared tomcat instance and the applications hosted by the shared tomcat instance will not work. For re-compiling, the connector settings also need a server-wide update and this cannot be done in a shared server environment. We request you to try our VPS plans by visiting the below link.'

I think purchasing a vps plan should be a last resort. Is there anyone here with a more conducive solution to the problem.

#java #javascript #apache

What is GEEK

Buddha Community

You need VPS in this case. The last I’ve purchased was hetzner, they provide new plans with less powerful CPU or something like this, so I get 4gb RAM server for 5.88 USD / month, 1gb for 2.99

WebSocket through Apache and Tomcat 500 Error : java.lang.UnsupportedOperationException: HTTP upgrade is not supported by this protocol

I was implementing Web Socket using JavaScript on the client and Java/Tomcat on the server. It works very fine on localhost but when I deploy on my remote host it fails. Checking the console, I get 500 error on the Web socket request. Hence i check the server error log to view the error and find -

java.lang.UnsupportedOperationException: HTTP upgrade is not supported by this protocol
    at org.apache.coyote.AbstractProcessor.doHttpUpgrade(AbstractProcessor.java:712) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProcessor.action(AbstractProcessor.java:478) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.Request.action(Request.java:433) ~[tomcat-coyote.jar:8.5.20]
    at org.apache.catalina.connector.Request.upgrade(Request.java:2022) ~[catalina.jar:8.5.20]
    at org.apache.catalina.connector.RequestFacade.upgrade(RequestFacade.java:1115) ~[catalina.jar:8.5.20]
    at org.apache.tomcat.websocket.server.UpgradeUtil.doUpgrade(UpgradeUtil.java:234) ~[tomcat-websocket-8.5.20.jar:8.5.20]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:77) ~[tomcat-websocket-8.5.20.jar:8.5.20]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[catalina.jar:8.5.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:8.5.20]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [catalina.jar:8.5.20]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [catalina.jar:8.5.20]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [catalina.jar:8.5.20]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [catalina.jar:8.5.20]
    at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:486) [tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:8.5.20]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-coyote.jar:8.5.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457) [tomcat-coyote.jar:8.5.20]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:8.5.20]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_11]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_11]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.5.20]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_11]

I did some research and stumbled on someone who had a similar problem and asked in this question WebSockets through Apache and Tomcat: HTTP upgrade is not supported by the AJP protocol but am running a private tomcat instance on a shared hosting server so the solutions provided in that answer cannot be achieved by me hence i contact my host and they respond with

'While investigating your query, we could see that making changes in the tomcat and HTTP settings as per the steps mentioned in your email will affect the AJP connection configuration of another shared tomcat instance and the applications hosted by the shared tomcat instance will not work. For re-compiling, the connector settings also need a server-wide update and this cannot be done in a shared server environment. We request you to try our VPS plans by visiting the below link.'

I think purchasing a vps plan should be a last resort. Is there anyone here with a more conducive solution to the problem.

#java #javascript #apache

Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Roberta  Ward

Roberta Ward

1595344320

Wondering how to upgrade your skills in the pandemic? Here's a simple way you can do it.

Corona Virus Pandemic has brought the world to a standstill.

Countries are on a major lockdown. Schools, colleges, theatres, gym, clubs, and all other public places are shut down, the country’s economy is suffering, human health is on stake, people are losing their jobs and nobody knows how worse it can get.

Since most of the places are on lockdown, and you are working from home or have enough time to nourish your skills, then you should use this time wisely! We always complain that we want some ‘time’ to learn and upgrade our knowledge but don’t get it due to our ‘busy schedules’. So, now is the time to make a ‘list of skills’ and learn and upgrade your skills at home!

And for the technology-loving people like us, Knoldus Techhub has already helped us a lot in doing it in a short span of time!

If you are still not aware of it, don’t worry as Georgia Byng has well said,

“No time is better than the present”

– Georgia Byng, a British children’s writer, illustrator, actress and film producer.

No matter if you are a developer (be it front-end or back-end) or a data scientisttester, or a DevOps person, or, a learner who has a keen interest in technology, Knoldus Techhub has brought it all for you under one common roof.

From technologies like Scala, spark, elastic-search to angular, go, machine learning, it has a total of 20 technologies with some recently added ones i.e. DAML, test automation, snowflake, and ionic.

How to upgrade your skills?

Every technology in Tech-hub has n number of templates. Once you click on any specific technology you’ll be able to see all the templates of that technology. Since these templates are downloadable, you need to provide your email to get the template downloadable link in your mail.

These templates helps you learn the practical implementation of a topic with so much of ease. Using these templates you can learn and kick-start your development in no time.

Apart from your learning, there are some out of the box templates, that can help provide the solution to your business problem that has all the basic dependencies/ implementations already plugged in. Tech hub names these templates as xlr8rs (pronounced as accelerators).

xlr8rs make your development real fast by just adding your core business logic to the template.

If you are looking for a template that’s not available, you can also request a template may be for learning or requesting for a solution to your business problem and tech-hub will connect with you to provide you the solution. Isn’t this helpful 🙂

Confused with which technology to start with?

To keep you updated, the Knoldus tech hub provides you with the information on the most trending technology and the most downloaded templates at present. This you’ll be informed and learn the one that’s most trending.

Since we believe:

“There’s always a scope of improvement“

If you still feel like it isn’t helping you in learning and development, you can provide your feedback in the feedback section in the bottom right corner of the website.

#ai #akka #akka-http #akka-streams #amazon ec2 #angular 6 #angular 9 #angular material #apache flink #apache kafka #apache spark #api testing #artificial intelligence #aws #aws services #big data and fast data #blockchain #css #daml #devops #elasticsearch #flink #functional programming #future #grpc #html #hybrid application development #ionic framework #java #java11 #kubernetes #lagom #microservices #ml # ai and data engineering #mlflow #mlops #mobile development #mongodb #non-blocking #nosql #play #play 2.4.x #play framework #python #react #reactive application #reactive architecture #reactive programming #rust #scala #scalatest #slick #software #spark #spring boot #sql #streaming #tech blogs #testing #user interface (ui) #web #web application #web designing #angular #coronavirus #daml #development #devops #elasticsearch #golang #ionic #java #kafka #knoldus #lagom #learn #machine learning #ml #pandemic #play framework #scala #skills #snowflake #spark streaming #techhub #technology #test automation #time management #upgrade

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Alice Cook

Alice Cook

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Fix: Gmail Error 500 | Gmail Temporary Error

You just need to have the right Gmail error 500 solving guidance to solve the errors occurring in Gmail. We shall talk about one such error in this video, and that error is Gmail temporary error 500.
Visit: https://contactforhelp.com/gmail/

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