此错误与库版本有关,但我无法确定。
我正在 Crunchify 上完成一个 REST 示例:Link
项目副本链接:Temp Converter Challenge
我使用的是 Java 11,版本 1.8,运行时环境是 Tomcat 9。动态网页模块版本为4.0.0。
推荐的错误修复之一使用 Jersey 2.x,而该项目最初是使用 Jersey 1.x 构建的,如果混合使用,两者显然不兼容。这是错误的根本原因,我不知道使用什么版本的Jersey 2.x,尝试了一堆都没有成功。
我更新了 pom 和 web.xml 文件以反射(reflect) Jersey 2.x,这也是推荐使用的 Jersey 版本。
pom文件是这样的,注释内容是Jersey 1.x:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>CrunchifyRESTJerseyExample</groupId>
<artifactId>CrunchifyRESTJerseyExample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<!-- <sourceDirectory>src</sourceDirectory> -->
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.1</version>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.3.1</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20170516</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>2.26</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.13</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.core</groupId>
<artifactId>jersey-client</artifactId>
<version>2.13</version>
<scope>provided</scope>
</dependency>
<!-- <dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.19.4</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-core</artifactId>
<version>1.19.4</version>
</dependency> -->
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
<version>2.3.0.1</version>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
与原来的一些变化:
我说的是目标版本 1.8,而不是 1.7,因为即使指南也建议使用 1.8,但如果不在文件中指定它就无法执行此操作。此外,由于 pom 文件中的错误,我添加了以下依赖项:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.1</version>
</plugin>
我还更改了 xml 内容,因为 servlet 还必须与 Jersey 版本兼容。注释掉的是 Jersey 1.x 的版本
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>CrunchifyRESTJerseyExample</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.crunchify.restjersey</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- <servlet>
<servlet-name>Jersey Web Application</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet> -->
<servlet-mapping>
<servlet-name>Jersey Web Application</servlet-name>
<url-pattern>/crunchify/*</url-pattern>
</servlet-mapping>
</web-app>
我进一步尝试了对 2020 版 Eclipse 项目的评论中的建议,但无济于事。
我已经查看了许多类似的问题,包括示例下的评论。这只是我到目前为止所查找内容的一部分:
How to fix 'javax.servlet.ServletException: Servlet.init()' Error for Tomcat
Jersey with Spring Error : Servlet.init() for servlet Jersey REST Service threw exception
Servlet.init() for servlet example threw exception
也许这个例子太旧了,但一切都指向导致它无法正常工作的库版本,我无法弄清楚我最终需要哪些版本。
更新,2022 年 4 月 9 日:
项目堆栈跟踪:
Apr. 09, 2022 2:01:00 P.M. com.sun.jersey.api.core.servlet.WebAppResourceConfig init
INFO: Scanning for root resource and provider classes in the Web app resource paths:
/WEB-INF/lib
/WEB-INF/classes
Apr. 09, 2022 2:01:01 P.M. org.apache.catalina.core.ApplicationContext log
SEVERE: Servlet.init() for servlet [Jersey Web Application] threw exception
java.lang.IllegalArgumentException
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:170)
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:153)
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:424)
at com.sun.jersey.spi.scanning.AnnotationScannerListener.onProcess(AnnotationScannerListener.java:138)
at com.sun.jersey.core.spi.scanning.JarFileScanner.scan(JarFileScanner.java:97)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner$1.f(WebAppResourcesScanner.java:94)
at com.sun.jersey.core.util.Closing.f(Closing.java:71)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner.scan(WebAppResourcesScanner.java:92)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner.scan(WebAppResourcesScanner.java:79)
at com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:80)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.init(WebAppResourceConfig.java:102)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.<init>(WebAppResourceConfig.java:89)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.<init>(WebAppResourceConfig.java:74)
at com.sun.jersey.spi.container.servlet.WebComponent.getWebAppResourceConfig(WebComponent.java:668)
at com.sun.jersey.spi.container.servlet.ServletContainer.getDefaultResourceConfig(ServletContainer.java:435)
at com.sun.jersey.spi.container.servlet.ServletContainer.getDefaultResourceConfig(ServletContainer.java:602)
at com.sun.jersey.spi.container.servlet.WebServletConfig.getDefaultResourceConfig(WebServletConfig.java:87)
at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:699)
at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:205)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:577)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1134)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1089)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:761)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
Apr. 09, 2022 2:01:01 P.M. org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet [Jersey Web Application]
java.lang.IllegalArgumentException
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:170)
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:153)
at jersey.repackaged.org.objectweb.asm.ClassReader.<init>(ClassReader.java:424)
at com.sun.jersey.spi.scanning.AnnotationScannerListener.onProcess(AnnotationScannerListener.java:138)
at com.sun.jersey.core.spi.scanning.JarFileScanner.scan(JarFileScanner.java:97)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner$1.f(WebAppResourcesScanner.java:94)
at com.sun.jersey.core.util.Closing.f(Closing.java:71)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner.scan(WebAppResourcesScanner.java:92)
at com.sun.jersey.spi.scanning.servlet.WebAppResourcesScanner.scan(WebAppResourcesScanner.java:79)
at com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:80)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.init(WebAppResourceConfig.java:102)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.<init>(WebAppResourceConfig.java:89)
at com.sun.jersey.api.core.servlet.WebAppResourceConfig.<init>(WebAppResourceConfig.java:74)
at com.sun.jersey.spi.container.servlet.WebComponent.getWebAppResourceConfig(WebComponent.java:668)
at com.sun.jersey.spi.container.servlet.ServletContainer.getDefaultResourceConfig(ServletContainer.java:435)
at com.sun.jersey.spi.container.servlet.ServletContainer.getDefaultResourceConfig(ServletContainer.java:602)
at com.sun.jersey.spi.container.servlet.WebServletConfig.getDefaultResourceConfig(WebServletConfig.java:87)
at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:699)
at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:205)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:577)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1134)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1089)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:761)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
最佳答案
如何解决问题
实际上,在克隆你的 GitHub 项目时,我只需要确保两个 <servlet-name>
web.xml 中的条目完全相同。你的不一样,因为你在从教程中复制文件后更改了一个,而不是两个。
<servlet-name>Jersey REST Service</servlet-name>
我用 mvn clean package
构建了你的例子,然后为本地安装的 Tomcat 9.0.62 创建运行配置,将 WAR 添加为部署,
启动服务器,它立即工作:
Jersey 和 ASM 版本
您正在使用超旧的软件版本,例如Jersey 2.13 太旧了,甚至没有包含在 Eclipse Jersey 中。 GitHub 存储库,从 2018 年开始发布第一个版本 2.28-RC1 .为了找到存档的遗产GlassFish Jersey存储库,我必须先环顾四周。
无论如何,Jersey 2.13,您为项目选择的版本,根据 POM 在内部使用 ASM 5.0.2 .我在你自己的 POM 中看到了 ASM 3.3.1,根据 ASM release notes甚至还不完全支持 Java 7。然而,您正在根据您的 Maven 编译器设置编译为 Java 8 字节代码版本。因此,无论 ASM 在您的项目中做什么,您都希望至少使用支持 Java 8 的版本。那至少是 ASM 5.0,因此我建议坚持使用 Jersey 使用的版本 5.0.2。
但这并不能解决您的问题。堆栈跟踪实际上表示 jersey.repackaged.org.objectweb.asm.ClassReader
中存在问题,即在 ASM 类中打包并重新定位到 Jersey 本身。它没有使用您在 POM 中指定的旧版本。我无法在本地重现您的问题。我只想提一下。
优化POM
后来我用了mvn dependency:analyze
为了找出您实际使用的依赖项。正如我所说,ASM 未在您的 servlet 中使用。所以你可以删除它。您只需要 Jersey、JSON 和 Jakarta WS-RS API,这是 Jersey 库之一的传递依赖项,但如果您访问它的类,您仍然应该在 POM 中引用它。依赖传递依赖不是干净的 Maven 方式。我还升级了您使用的插件和 JSON 依赖项,然后删除了所有未使用的内容。新的 POM 看起来像这样:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>CrunchifyRESTJerseyExample</groupId>
<artifactId>CrunchifyRESTJerseyExample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20220320</version>
</dependency>
<dependency>
<groupId>jakarta.ws.rs</groupId>
<artifactId>jakarta.ws.rs-api</artifactId>
<version>2.1.6</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>2.35</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.inject</groupId>
<artifactId>jersey-hk2</artifactId>
<version>2.35</version>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.35</version>
</dependency>
</dependencies>
</project>
GitHub 拉取请求
https://github.com/username917/Temerature-Converter-Challenge/pull/2
关于java - 什么 Jersey 2.x 库版本可以解决这个问题?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/71649841/