


Why Do My Servlets Return 404 Errors After Migrating from Tomcat 9 to Tomcat 10?
Tomcat 10.0.4 Fails to Load Servlets with 404 Error: Understanding the Java EE to Jakarta EE Migration
You may encounter issues with accessing servlets in your web application deployed on Tomcat 10.0.4, resulting in a 404 error. This behavior stems from differences between the Java EE and Jakarta EE standards, which have implications for servlets in Tomcat 10:
API Namespace Change:
The API namespace for servlets has changed from javax. in Servlet 4.0 (used by Tomcat 9) to jakarta. in Servlet 5.0 (used by Tomcat 10). This means that:
- Code written for Servlet 4.0 will not compile with Tomcat 10's API jars.
- Servlet 4.0 applications using a web.xml descriptor may throw exceptions and fail to start.
- Servlets using annotations to declare themselves will no longer work, as in your case.
ServletContainerInitializer Dependency:
Applications relying on ServletContainerInitializer, such as Spring and Spring Boot, may fail to start due to @javax.servlet.WebServlet annotations being ignored by the server. Instead, the server scans for @jakarta.servlet.WebServlet.
Solution:
To resolve these issues, consider using the Tomcat Migration Tool for Jakarta EE. This tool simplifies the necessary code changes to ensure compatibility with the new Java EE to Jakarta EE migration:
- Update the project's Maven dependencies or source code to use the jakarta.* API namespace.
- Modify any annotations or XML configuration using the correct Jakarta EE namespace.
- Recompile and test the application.
Warning:
Tomcat's download site includes a warning about the namespace change, highlighting the need for code adjustments when migrating from Tomcat 9 to Tomcat 10 and later.
The above is the detailed content of Why Do My Servlets Return 404 Errors After Migrating from Tomcat 9 to Tomcat 10?. For more information, please follow other related articles on the PHP Chinese website!

JVMmanagesgarbagecollectionacrossplatformseffectivelybyusingagenerationalapproachandadaptingtoOSandhardwaredifferences.ItemploysvariouscollectorslikeSerial,Parallel,CMS,andG1,eachsuitedfordifferentscenarios.Performancecanbetunedwithflagslike-XX:NewRa

Java code can run on different operating systems without modification, because Java's "write once, run everywhere" philosophy is implemented by Java virtual machine (JVM). As the intermediary between the compiled Java bytecode and the operating system, the JVM translates the bytecode into specific machine instructions to ensure that the program can run independently on any platform with JVM installed.

The compilation and execution of Java programs achieve platform independence through bytecode and JVM. 1) Write Java source code and compile it into bytecode. 2) Use JVM to execute bytecode on any platform to ensure the code runs across platforms.

Java performance is closely related to hardware architecture, and understanding this relationship can significantly improve programming capabilities. 1) The JVM converts Java bytecode into machine instructions through JIT compilation, which is affected by the CPU architecture. 2) Memory management and garbage collection are affected by RAM and memory bus speed. 3) Cache and branch prediction optimize Java code execution. 4) Multi-threading and parallel processing improve performance on multi-core systems.

Using native libraries will destroy Java's platform independence, because these libraries need to be compiled separately for each operating system. 1) The native library interacts with Java through JNI, providing functions that cannot be directly implemented by Java. 2) Using native libraries increases project complexity and requires managing library files for different platforms. 3) Although native libraries can improve performance, they should be used with caution and conducted cross-platform testing.

JVM handles operating system API differences through JavaNativeInterface (JNI) and Java standard library: 1. JNI allows Java code to call local code and directly interact with the operating system API. 2. The Java standard library provides a unified API, which is internally mapped to different operating system APIs to ensure that the code runs across platforms.

modularitydoesnotdirectlyaffectJava'splatformindependence.Java'splatformindependenceismaintainedbytheJVM,butmodularityinfluencesapplicationstructureandmanagement,indirectlyimpactingplatformindependence.1)Deploymentanddistributionbecomemoreefficientwi

BytecodeinJavaistheintermediaterepresentationthatenablesplatformindependence.1)Javacodeiscompiledintobytecodestoredin.classfiles.2)TheJVMinterpretsorcompilesthisbytecodeintomachinecodeatruntime,allowingthesamebytecodetorunonanydevicewithaJVM,thusfulf


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Chinese version
Chinese version, very easy to use

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
