Onkar S.

asked • 12/29/21

Error instantiating servlet class [test.Hello]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

jakarta.servlet.ServletException: Error instantiating servlet class [test.Hello]
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:353)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:872)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1695)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:831)


Antony Deepak B.

Need the complete exception log, web.xml and the servlet class to find where exactly the issue is.
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12/29/21

Richard S.

tutor
I agree. Basically all you have sent is the computer saying something is broke but without any context or code that might help pinpoint why it happened.
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06/22/22

Moinul H.

Essentially it means, it can't find the Servlet class. Check if the classes directory contains the Hello file.
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07/23/22

Bilal M.

This error message is indicating that there is a problem with a servlet class named "test.Hello" in a Jakarta Servlet. Specifically, it is saying that there was an error while trying to instantiate (create an instance of) the servlet. It might be caused by a few reasons like : test.Hello class is not found in the classpath test.Hello class is not a Servlet class test.Hello class has a problem in the constructor or init method test.Hello class does not have a default constructor test.Hello class is not deployed in the server You should check the classpath, the code of the test.Hello class, and the web.xml for more information.
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01/14/23

1 Expert Answer

By:

Mircea T. answered • 09/24/23

Tutor
4 (1)

AI & Software Engineering (Java/TypeScript/JavaSctipt)

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There are many reason this could happen, most likely based on the info provided is that the class cannot be found in the package provided. To fix it make sure you have the right package, it could be com.test.Hello

Let me know if you need help debugging further.

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